Version A - 03/19

Service Manual

VMA-1240
Commercial Series
1 Channel Mixer-Amplifier

1
 VMA 1240 Service Manual
Version A - 03/19

Table of Contents

Safety and Compliance

Datasheets and Specifications

Front Panel

Rear Panel

Wiring and Connectors

Configuration Settings

VOX Function

Priority Muting

Remote Volume Control

Media Player

Troubleshooting

Block Diagram

PCB Boards

Schematics

Bill of Materials

2
 VMA 1240 Service Manual
Version A - 03/19

IMPORTANT SAFETY INFORMATION

WARNING FOR YOUR PROTECTION
READ THESE INSTRUCTIONS:
WARNING
KEEP THESE INSTRUCTIONS
RISK OF ELETRIC SHOCK
DO NOT OPEN
HEED ALL WARNINGS
AVERTISSEMENT: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
FOLLOW ALL INSTRUCTIONS
WARNING: TO THE REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
THE APPARATUS SHALL NOT BE EXPOSED TO DRIPPING OR
SPLASHING LIQUID AND NO OBJECT FILLED WITH LIQUID, SUCH
The symbols shown above are internationally accepted symbols AS VASES, SHALL BE PLACED ON THE APPARATUS
that warn of potential hazards with electrical products. The light-
CLEAN ONLY WITH A DRY CLOTH.
ning flash with arrow point in an equilateral triangle means that
there are dangerous voltages present within the unit. The exclama- DO NOT BLOCK ANY OF THE VENTILATION OPENINGS. INSTALL IN
tion point in an equilateral triangle indicates that it is necessary for
ACCORDANCE WITH THE MANUFACTURER’S INSTRUCTIONS.
the user to refer to the owner’s manual. DO NOT INSTALL NEAR ANY HEAT SOURCES SUCH AS
RADIATORS, HEAT REGISTERS, STOVES, OR OTHER APPARATUS
These symbols warn that there are no user serviceable parts inside (INCLUDING AMPLIFIERS) THAT PRODUCE HEAT.
the unit. Do not open the unit. Do not attempt to service the unit
ONLY USE ATTACHMENTS/ACCESSORIES SPECIFIED BY THE
yourself. Refer all servicing to qualified personnel. Opening the MANUFACTURER.
chassis for any reason will void the manufacturer’s warranty. Do not
UNPLUG THIS APPARATUS DURING LIGHTNING STORMS OR WHEN
get the unit wet. If liquid is spilled on the unit, shut it off immediately UNUSED FOR LONG PERIODS OF TIME.
and take it to a dealer for service. Disconnect the unit during
storms to prevent damage. Do not defeat the safety purpose of the polarized or grounding-type
plug. A polarized plug has two blades with one wider than the
other. A grounding type plug has two blades and a third grounding
prong. The wide blade or third prong are provided for your safety. If
SAFETY INSTRUCTIONS the provided plug does not fit your outlet, consult an electrician for
replacement of the obsolete outlet.
NOTICE FOR CUSTOMERS IF YOUR UNIT IS EQUIPPED WITH A POWER Protect the power cord from being walked on or pinched particularly
CORD. at plugs, convenience receptacles, and the point where they exit from
the apparatus.
WARNING: THIS APPLIANCE SHALL BE CONNECTED TO A MAINS SOCKET
OUTLET WITH A PROTECTIVE EARTHING CONNECTION. Use only with the cart stand, tripod bracket, or table specified by
The cores in the mains lead are colored in accordance with the following code: the manufacture, or sold with the apparatus. When a cart is used,
use caution when moving the cart/apparatus combination to avoid
GREEN and YELLOW - Earth BLUE - Neutral BROWN - Live injury from tip-over. Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been damaged in any
As colors of the cores in the mains lead of this appliance may not cor- way, such as power-supply cord or plug is damaged, liquid has been
respond with the colored markings identifying the terminals in your plug, spilled or objects have fallen into the apparatus, the apparatus has
proceed as follows: been exposed to rain or moisture, does not operate normally, or has
been dropped.
• The core which is colored green and yellow must be connected to the
terminal in the plug marked with the letter E, or with the earth symbol,
or colored green, or green and yellow.
• The core which is colored blue must be connected to the terminal
marked N or colored black. POWER ON/OFF SWITCH: For products provided with a power
• The core which is colored brown must be connected to the terminal switch, the power switch DOES NOT break the connection from the
marked L or colored red. mains.

This equipment may require the use of a different line cord, attachment MAINS DISCONNECT: The plug shall remain readily operable. For
rack-mount or installation where plug is not accessible, an all-pole
plug, or both, depending on the available power source at installation. If
mains switch with a contact separation of at least 3 mm in each
the attachment plug needs to be changed, refer servicing to qualified ser- pole shall be incorporated into the electrical installation of the rack
vice personnel who should refer to the table below. The green/yellow wire or building.
shall be connected directly to the units chassis.
WIRE COLOR FOR UNITS EQUIPPED WITH EXTERNALLY ACCESSIBLE FUSE
CONDUCTOR RECEPTACLE: Replace fuse with same type and rating only.
Normal Alt
L LIVE BROWN BLACK
MULTIPLE-INPUT VOLTAGE: This equipment may require the use
N NEUTRAL BLUE WHITE of a different line cord, attachment plug, or both, depending on the
E EARTH GND GREEN/YEL GREEN available power source at installation. Connect this equipment only to
the power source indicated on the equipment rear panel. To reduce
WARNING: If the ground is defeated, certain fault conditions in the unit or in the risk of fire or electric shock, refer servicing to qualified service
the system to which it is connected can result in full line voltage between personnel or equivalent.
chassis and earth ground. Severe injury or death can then result if the If connected to 240V supply, a suitable CSA/UL certified power cord shall
chassis and earth ground are touched simultaneously. be used for this supply.

3
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

IMPORTANT SAFETY INFORMATION

U.K. MAINS PLUG WARNING FEDERAL COMMUNICATION
A molded mains plug that has been cut off from the cord is unsafe. COMMISSION INTERFERENCE STATEMENT
Discard the mains plug at a suitable disposal facility. NEVER UNDER ANY This equipment has been tested and found to comply with the limits for a Class B digital
CIRCUMSTANCES SHOULD YOU INSERT A DAMAGED OR CUT MAINS PLUG device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
INTO A 13 AMP POWER SOCKET. Do not use the mains plug without the reasonable protection against harmful interference in a residential installation. This
fuse cover in place. Replacement fuse covers can be obtained from your equipment generates, uses and can radiate radio frequency energy and, if not installed
local retailer. Replacement fuses are 13 amps and MUST be ASTA approved and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
to BS1362.
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one of the following measures:

• Reorient or relocate the receiving antenna.

ELECTROMAGNETIC
• Increase the separation between the equipment and receiver.
COMPATIBILITY
• Connect the equipment into an outlet on a circuit different from that to which
This device complies with part 15 of the FCC Rules and the Product speci- the receiver is connected.
fications noted on the Declaration of Conformity. Operation is subject to the
• Consult the dealer or an experienced radio/TV technician for help.
following two conditions:
• This device may not cause harmful FCC CAUTION
interference, and Any changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate this equipment.
• This device must accept any interference received, including interfer-
ence that may cause undesired operation. This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions:
Operation of this unit within significant
electromagnetic fields should be avoided. 1. This device may not cause harmful interference, and
• Use only shielded interconnecting cables. 2. This device must accept any interference received, including interference that
may cause undesired operation.

IMPORTANT NOTE
This equipment complies with FCC radiation exposure limits set forth for an
USE GROUNDED OUTLET ONLY! uncontrolled environment. This transmitter module must not be colocated or operated
in conjunction with any other antenna or transmitter. This End equipment should be
installed and operated with a minimum distance of 20 centimeters between the radiator
Apparatet må tilkoples jordet stikkontakt and your body.

Apparaten skall anslutas till jordat uttag

CANADA STATEMENT
Laite on liitettävä suojakoskettimilla varustettuun pistorasiaan This device complies with Industry Canada’s licence-exempt RSSs. Operation is subject
to the following two conditions:

1. This device may not cause interference; and

2. This device must accept any interference, including interference that may cause
MAGNETIC FIELD undesired operation of the device.

CAUTION! Do not locate sensitive high-gain equipment such as This device complies with Industry Canada’s licence-exempt RSSs. Operation is subject
to the following two conditions:
preamplifiers or tape decks directly above or below the unit. Because this
amplifier has a high power density, it has a strong magnetic field which 1. l’appareil ne doit pas produire de brouillage;
can induce hum into unshielded devices that are located nearby. The field
2. l’utilisateur de l’appareil doit accepter tout brouillage radioélectrique subi,même
is strongest just above and below the unit. si le brouillage est susceptible d’en compromettre le fonctionnement.
If an equipment rack is used, we recommend locating the amplifier(s) CAUTION EXPOSURE
in the bottom of the rack and the preamplifier or other sensitive equip- This device meets the exemption from the routine evaluation limits in section 2.5 of
ment at the top. RSS102 and users can obtain Canadian information on RF exposure and compliance.

Le dispositif répond à l’exemption des limites d’évaluation de routine dans la section

2.5 de RSS102 et les utilisateurs peuvent obtenir des renseignements canadiens sur
l’exposition aux RF et le respect.
If you want to dispose this product, do not mix it with
general household waste. There is a separate collection THE FINAL END PRODUCT MUST BE LABELLED IN
system for used electronic products in accordance with
legislation that requires proper treatment, recovery
A VISIBLE AREA WITH THE FOLLOWING
The Industry Canada certification label of a module shall be clearly visible at all times
and recycling. when installed in the host device, otherwise the host device must be labelled to display
the Industry Canada certification number of the module, preceded by the words
Private household in the 25 member states of the EU, in Switzerland “Contains transmitter module”, or the word “Contains”, or similar wording expressing
and Norway may return their used electronic products free of charge the same meaning, as follows: “Contains transmitter module IC: 6132A-MB8811VMA”
to designated collection facilities or to a retailer (if you purchase a
similar new one). This End equipment should be installed and operated with a minimum distance of 20
centimeters between the radiator and your body.
For Countries not mentioned above, please contact your local authori- Cet équipement devrait être installé et actionné avec une distance minimum de 20
ties for a correct method of disposal. centimètres entre le radiateur et votre corps.

By doing so you will ensure that your disposed product undergoes The end user manual shall include all required regulatory information/warning as shown
the necessary treatment, recovery and recycling and thus prevent in this manual.
potential negative effects on the environment and human health.

Table of Contents
4
 VMA 1240 Service Manual
Version A - 03/19

EC - DECLARATION OF CONFORMITY
Brand: JBL
Equipment Type: Commercial Mixer-Amplifiers
Model names: VMA160, VMA1120, VMA1240, VMA260, VMA2120

We, Harman International, declare under our sole responsibility that the product, to which this declaration relates, is in
conformity with the following standards.
Report No. Description

EN 55103-1:2009 EMC Compatibility – Product Family Standard for Audio, Video, Audio-Visual and
+A1:2012 Entertainment Lighting Control Apparatus for Professional Use, Part 1: Emissions
EN 55103-1:2009 Field Emissions – Annex A @ 10cm and 20cm
+A1:2012
EN 61000-3-2:2014 Limits for Harmonic Current Emissions (equipment input current less than or equal to 16A)
EN 61000-3-3:2013 Limitation of Voltage Fluctuations and Flicker in Low-Voltage Supply systems Rated Current
less than or equal to 16A
EN 55022:2010 Limits and Methods of Measurement of Radio Disturbance Characteristics of ITE: Radiated
& Conducted, Class B Limits
EN 55103-2:2009 EMC Compatibility – Product Family Standard for Audio, Video, Audio-Visual and
Entertainment Lighting Control Apparatus for Professional Use, Part 2: Immunity
EN 61000-4-2:2009 Ed 9 Electrostatic Discharge Immunity (Environment E2-Criteria B, 4k V Contact, 8k V Air
Discharge)
EN 61000-4-3:2010 Radiated, Radio-Frequency, EMC Immunity (Environment E2, Criteria A)
Ed 3.2
EN 61000-4-4:2012 Electrical Fast Transient/Burst Immunity (Criteria B)
Ed 12
EN 61000-4-5:2014 Surge Immunity (Criteria B)
EN 61000-4-6:2014 Immunity to Conducted Disturbances Induced by Radio-Frequency Fields (Criteria A)
EN 61000-4-11:2004 Voltage Dips, Short Interruptions and Voltage Variation

Safety Standard:
IEC 60065:2014 Ed8 Safety Requirements – Audio, Video, and Similar Electronic Apparatus
EN 60065:2014

Due to line current harmonics, we recommend that you contact your supply authority before connection.

We certify that the product identified above conforms to the requirements of the EMC Council Directive 89/336/EEC as amended
by 92/31/EEC, and the Low Voltage Directive 73/23/EC as amended by 93/68/EEC.

Table of Contents
5
 VMA 1240 Service Manual
Version A - 03/19

$SSHQGL[$7DUJHW3HUIRUPDQFH6SHFLÀFDWLRQV
Performance VMA160 VMA1120 VMA1240 VMA260 VMA2120

Max Output Power per Channel

60W 120W 240W 60W 120W
into 4 Ω or 8 ΩL)[ ≤ 0.5% THD

Insertion Loss
1 dB maximum
(70V & 100V outputs)

Number of Input Channels 5 5 5 8 8

Number of Output Channels 1 1 1 2 2

Tone Controls
Bass +/-14dB @ 50Hz
(Bass and Treble non-detented
Treble +/-14dB @ 10kHz
potentiometers on each channel)

Input Sensitivity Mic Input: 5.5mVRMS

(to obtain full rated power into 8 Line Input: 1.3VRMS
ûMPBE RCA Input (stereo in): 130mVRMS

Frequency Response
û0VUQVU)[L)[  E#
(measured at 2.83VRMS into rated 70V/100V Outputs: 80Hz - 15kHz +/-3dB
load impedance at any output)

Total Harmonic Distortion (THD)

(measured at 2.83VRMS into rated Power Amp Output: <0.5%, 20Hz - 20kHz
load impedance at any output)

Signal-to-Noise Ratio
(Ref. Rated Power, mixer levels
>76dB
@ min., master volume @ max.
A-weighted)

Input Impedance .JDû

(nominal) -JOFLû CBMBODFE
3$"Lû

Phantom Power 27VDC

Crosstalk
(reference rated power, volume at -70 dB
mid position, 1kHz)

Nominal AC Line Voltages 100V, 120V, 220V, 220-240V, 50/60 Hz

Minimum Load Impedance

Low Impedance Output û û û û û
70V Output û û û û û
100V Output û û û û û

Operating Temperature/
0°C to 35°C @ 95% R.H. (non-condensing)
Humidity

Storage Temperature -20°C to 85°C

Dimensions & Weight

Net Weight 19.4 lb 20.2 lb 25.5 lb 25.5 lb 29.3 lb

(8.8 kg) (9.2 kg) (11.6 kg) (11.6 kg) (13.3 kg)

Dimensions Width: 17.0 in. (432 mm)

Depth: 16.3 in. (415 mm)
Height: 3.5 in. (88 mm)

Shipping Weight 24.6 lb 25.5 lb 30.8 lb 30.8 lb 34.5 lb

(11.2 kg) (11.6 kg) (14 kg) (14 kg) (15.7 kg)

Table of Contents
6
 VMA 1240 Service Manual
Version A - 03/19

1.2 Front Panel Controls & Indicators

A B C D

MASTER

E
1 2 3 4 MUSIC

VMA 160 1 USB

F G H I J

Figure 1.2.1 Front Panel, 1 Channel Model

A. Input Level Controls

B. Media Player Display
C. Output Volume Control(s) Including an Illuminated ring around the output volume
control will light green with signal presence while red indicates clipping, i.e. the
signal has reached the threshold of audible distortion
D. Power Switch
E. Power on LED illuminates blue when power is switched on.
F. Input 1 - Front panel audio input capability via 1/4” TRS connector. The two
channel model includes a second, similar input (Input 4).
G. Media Player Controls
H. Tone Controls - Bass and Treble potentiometers for each output channel.
I. USB Audio Input
J. Bluetooth Key and Indicator

A B C D

MASTER 1 MASTER 2

E
1 2 3 MUSIC 1 4 5 6 MUSIC 2

VMA 260 1 4 USB

F H I J
G

Figure 1.2.2 Front Panel, 2 Channel Model

Table of Contents
7
 VMA 1240 Service Manual
Version A - 03/19

1.3 Rear Panel Controls & Connectors (VMA160, VMA1120, VMA1240)

A B C D E

WARNING - TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. CAUTION
Apparatet må tilkoples jordet stikkontakt THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING CONDITIONS: MADE IN CHINA
AVERTISSEMENT - RISQUE DE CHOC ÉLECTRIQUE - NE PAS OUVRIR.
Apparaten skall anslutas till jordat uttag 1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND 100V ~
RISK OF ELECTRIC SHOCK Laite on liitettävä suojakoskettimilla 2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE
AVERTISSEMENT - ÉNERGIE ÉLECTRIQUE DANGEREUSE VOIR LA NOTICE DE FONCTIONNEMENT. DO NOT OPEN varustettuun pistorasiaan UNDESIRED OPERATION. 120V ~
CAN-ICES-3(B)/NMB-3(B) 220V-240V ~
CLASS 2 OUTPUT WIRING PERMITTED INPUT1 INPUT2 INPUT3 INPUT4 MUSIC

1-70V/100V Output

5-Input 2 Phantom

8-Input 4 Phantom
3-Input 1 Line/Mic
4-Input 2 Line/Mic

6-Input 3 Line/Mic
7-Input 4 Line/Mic
50/60Hz 225W
OUTPUTS FRONT
REMOTE

2-Chime
ATTENTION - POUR RÉDUIRE LE
PANEL RISQUE DE CHOCK ÉLECTRIQUE, LA
FICHE CENTRALE DE LA PRISE DOIT
100V 70V COM (CSR-V) ÊTRE BRANCHÉE POUR MAINTENIR

MIC
MIC

MIC
MIC
LA MISE À LA TERRE.

ON
ON

ON

ON
CAUTION - TO REDUCE THE RISK OF
ELECTRIC SHOCK, GROUNDING OF
THE CENTER PIN OF THE PLUG MUST
BE MAINTAINED.

VOX MONO MONO

OFF
OFF
LINE
LINE
OFF
LINE
LINE
OFF
(Input 2)
PRIORITY SUM SUM
CONFORMS TO CONTAINS FCC ID: API-MB8811VMA HARMAN INTERNATIONAL

VMA 1240
UL STD .60065 CONTAINS IC: 6132A-MB8811VMA 1718 W. Mishawaka Rd.,
CERTIFIED TO CSA STD.
C22.2 NO .60065 CMIIT ID: 2016DJ2941 Elkhart, IN 46517

F G H I

Figure 1.3.1 Rear Panel - VMA 1240

A. "NQMJmFSPVUQVUDPOOFDUPST
B. Remote volume connectors – RJ-45 style connector to connect to JBL CSR-V
control module.
C. VOX sensitivity adjustment for Input 1.
D. Input 4 may use either Euroblock or RCA style connector.
E. AC Power Inlet – Detachable IEC.
F. $POmHVSBUJPOTXJUDIFTDPOUSPMNJDMJOFHBJOTFUUJOHTBOEQIBOUPNQPXFSGPSUIF
inputs as well as enable the chime and 70V/100V output mode.
G. Input 2 – Euroblock connector provides for audio input and priority contacts that
will duck other channels during an announcement when contacts closed using a
switch.
H. Input 3 accepts a 1/4” TRS connector.
I. Music input uses a Dual RCA Connector. Stereo, unbalanced sources will be
summed together.

Table of Contents
8
 VMA 1240 Service Manual
Version A - 03/19

1.4 Rear Panel Controls & Connectors (VMA260 & VMA2120)

A B C D E F G H

Apparatet må tilkoples jordet stikkontakt CAUTION THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION
Apparaten skall anslutas till jordat uttag RISK OF ELECTRIC SHOCK
IS SUBJECT TO THE FOLLOWING CONDITIONS: INPUT1 INPUT2 INPUT3 MUSIC1 INPUT4 INPUT5 INPUT6 MUSIC2 100V ~
Laite on liitettävä suojakoskettimilla 1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND
varustettuun pistorasiaan
DO NOT OPEN
2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, 120V ~
CAN-ICES-3(B)/NMB-3(B) INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION.
OUTPUTS FRONT FRONT 220V-240V ~
PANEL PANEL
REMOTE (CSR-V)
CH1 50/60Hz 175W

MONO MONO MONO MONO

WARNING - TO REDUCE CH1 CH2 PRIORITY SUM SUM PRIORITY SUM SUM
100V 70V COM THE RISK OF FIRE OR
ELECTRICAL SHOCK, DO NOT 1-Input 1 to CH2 1-70V/100V Output OFF ON 1-70V/100V Output OFF ON
2-Input 2 to CH2 2-Chime OFF ON 2-Chime OFF ON

CH2 Settings
CH1 Settings
EXPOSE THIS EQUIPMENT TO

Signal Routing
RAIN OR MOISTURE. 3-Input 3 to CH2 3-Input 1 Line/Mic LINE MIC 3-Input 4 Line/Mic LINE MIC
4-Music 1 to CH2 CH1 VOX 4-Input 2 Line/Mic LINE MIC CH2 VOX 4-Input 5 Line/Mic LINE MIC
AVERTISSEMENT - ATTENTION - POUR RÉDUIRE LE
CH2 RISQUE DE CHOC 5-BT/USB to CH2 (Input 2) 5-Input 2 Phantom OFF ON (Input 5) 5-Input 5 Phantom OFF ON RISQUE DE CHOCK ÉLECTRIQUE, LA
FICHE CENTRALE DE LA PRISE DOIT
ÉLECTRIQUE - NE PAS 6-Input 4 to CH1 6-Input 3 Line/Mic LINE MIC 6-Input 6 Line/Mic LINE MIC
ÊTRE BRANCHÉE POUR MAINTENIR
OUVRIR. 7-Input 5 to CH1 7-Input 3 Phantom OFF ON 7-Input 6 Phantom OFF ON LA MISE À LA TERRE.
AVERTISSEMENT - 8-Input 6 to CH1 8-Not Used NC NC CONFORMS TO 8-Not Used NC NC

VMA 260
ÉNERGIE ÉLECTRIQUE 9-Music 2 to CH1 CONTAINS FCC ID: API-MB8811VMA HARMAN INTERNATIONAL UL STD .60065 CAUTION - TO REDUCE THE RISK OF
DANGEREUSE VOIR LA 10-Not Used ELECTRIC SHOCK, GROUNDING OF
CONTAINS IC: 6132A-MB8811VMA 1718 W. Mishawaka Rd., CERTIFIED TO CSA STD. THE CENTER PIN OF THE PLUG MUST
CLASS 2 OUTPUT WIRING PERMITTED NOTICE DE CMIIT ID: 2016DJ2940 MADE IN CHINA Elkhart, IN 46517 C22.2 NO .60065 BE MAINTAINED.
FONCTIONNEMENT. OFF ON

I J K L M N

Figure 1.4.1 Rear Panel - VMA 260

A. "NQMJmFSPVUQVUDPOOFDUPST
B. Remote volume connectors – RJ-45 style connector to connect to JBL CSR-V
control modules.
C. Input 2 – Input audio through either the Euroblock connector or the 1/4” TRS
connector. Pins 4 and 5 of the Euroblock are priority contacts that will duck other
channels during an announcement when the contacts are closed using a switch.
D. Input 3 accepts input through either the 3-pin Euroblock or the Dual RCA jacks.
Stereo, unbalanced sources will be summed into a mono signal.
E. Music1 input uses a Dual RCA Connector. Stereo, unbalanced sources will be
summed together.
F. Input 5 – Input audio through either the Euroblock connector or the 1/4” TRS
connector. Pins 4 and 5 of the Euroblock are priority contacts that will duck other
channels during an announcement when the contacts are closed using a switch.
G. Input 6 accepts input through either the 3-pin Euroblock or the Dual RCA jacks.
Stereo, unbalanced sources will be summed together.
H. Music2 input uses a Dual RCA Connector. Stereo, unbalanced sources will be
summed together.
I. Signal Routing DIP switch is used to route inputs to both output channels. By
default, each group of inputs is routed only to its respective output channel (Input
1 – Music1 are routed to output CH1, Input 4 – Music2 are routed to output CH2).
J. VOX sensitivity adjustment for Input 1.
K. CH1 Settings DIP switch is used to enable the 70V/100V output option, turn on
the chime feature, select input gain, and enable phantom power for CH1.
L. VOX sensitivity adjustment for Input 4.
M. CH2 Settings DIP switch is used to enable the 70V/100V output option, turn on
the chime feature, select input gain, and enable phantom power for CH2.
N. AC Power Inlet – Detachable IEC.

Table of Contents
9
 VMA 1240 Service Manual
Version A - 03/19

FRONT VIEW

MASTER 1 MASTER 2

88.10 mm
[3.47 in]
1 2 3 MUSIC 1 4 5 6 MUSIC 2

VMA 260 1 4 USB

432.00 mm
[17.00 in]

SIDE VIEW

401.00 mm
[15.79 in]

Figure 2.2.1 Dimensions

Front Angle Brackets

Rear Angle Brackets

Rear Flat Brackets

Figure 2.2.2 Mounting Kit

Table of Contents
10
 VMA 1240 Service Manual
Version A - 03/19

2.3 Ensuring Proper Cooling

When using an equipment rack, keep a minimum space of 4 inches (10 cm) from
the top surface of the unit. Close any open spaces in the rack with blank panels. DO
NOT block any air vents. The side walls of the rack should be a minimum of 2 inches
DN GSPNUIFBNQMJmFSTJEFT5IFCBDLPGUIFSBDLTIPVMECFPQFO

2.4 Choosing Input Wire & Connectors

We recommend using pre-built or professionally wired balanced line (two-conductor
QMVTTIJFME HBVHFDBCMFTUPDPOOFDUUIFBNQMJmFSCBMBODFEJOQVUCZVTJOHUIF
included Euroblock connectors, see Figure 2.4.1. Unbalanced lines may be used,
but may result in hum or RF noise if using very long cable runs.
You can also use RCA connectors to connect audio devices, for example, CD/DVD
player. However, do not use both Euroblock and RCA audio input connectors on a
single channel at the same time.
NOTE:$VTUPNXJSJOHTIPVMEPOMZCFQFSGPSNFECZRVBMJmFEQFSTPOOFM

AUDIO AUDIO
SOURCE SOURCE

AUDIO AUDIO
SOURCE SOURCE

Figure 2.4.1 Input Wiring

NOTE: Two RCA connectors are provided for summing left and right channels from a
TUFSFPTPVSDF%POPUVTFCPUI&VSPCMPDLBOE3$"DPOOFDUPSTDPODVSSFOUMZGPSBOZ
TJOHMFJOQVUDIBOOFM

Table of Contents
11
 VMA 1240 Service Manual
Version A - 03/19

2.5 Output Wiring & Connectors

To drive distributed speaker systems designed to operate at 70V or 100V, connect to
the corresponding output terminals.
JBL recommends using pre-built or professionally wired, high-quality, two-conductor,
heavy gauge speaker wire. Speaker wires should be twisted cable, if possible. To
prevent the possibility of short-circuits, the wires should be stripped back no greater
than 6 mm (1/4 inch), see Figure 2.5.1.
Suggested below are guidelines to select the appropriate size of wire based on the
EJTUBODFGSPNBNQMJmFSUPTQFBLFS$IFDLXJUIMPDBMDPEFBTUIJTNBZWBSZ
Distance Wire Size
Up to 25 ft. (7.6m) 16AWG
26-40 ft. (7.9-12.2m) 14AWG

8O
Ohm
hm S
Speaker
peaker 70V Speaker System 100V Speaker System

Figure 2.5.1 Output Wiring

Table of Contents
12
 VMA 1240 Service Manual
Version A - 03/19

2.6 Wiring Your Audio System

WARNING - TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. CAUTION
Apparatet må tilkoples jordet stikkontakt THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING CONDITIONS: MADE IN CHINA
AVERTISSEMENT - RISQUE DE CHOC ÉLECTRIQUE - NE PAS OUVRIR.
Apparaten skall anslutas till jordat uttag 1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND 100V ~
RISK OF ELECTRIC SHOCK Laite on liitettävä suojakoskettimilla 2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE
AVERTISSEMENT - ÉNERGIE ÉLECTRIQUE DANGEREUSE VOIR LA NOTICE DE FONCTIONNEMENT. DO NOT OPEN varustettuun pistorasiaan UNDESIRED OPERATION. 120V ~
CAN-ICES-3(B)/NMB-3(B) 220V-240V ~
CLASS 2 OUTPUT WIRING PERMITTED INPUT1 INPUT2 INPUT3 INPUT4 MUSIC

1-70V/100V Output

5-Input 2 Phantom

8-Input 4 Phantom
3-Input 1 Line/Mic
4-Input 2 Line/Mic

6-Input 3 Line/Mic
7-Input 4 Line/Mic
50/60Hz 225W
OUTPUTS FRONT
REMOTE

2-Chime
ATTENTION - POUR RÉDUIRE LE
PANEL RISQUE DE CHOCK ÉLECTRIQUE, LA
FICHE CENTRALE DE LA PRISE DOIT
100V 70V COM (CSR-V) ÊTRE BRANCHÉE POUR MAINTENIR

MIC
MIC

MIC
MIC
ON LA MISE À LA TERRE.
ON

ON

ON
CAUTION - TO REDUCE THE RISK OF
ELECTRIC SHOCK, GROUNDING OF
THE CENTER PIN OF THE PLUG MUST
BE MAINTAINED.

VOX MONO MONO

OFF
OFF
LINE
LINE
OFF
LINE
LINE
OFF
(Input 2)
PRIORITY SUM SUM
CONFORMS TO CONTAINS FCC ID: API-MB8811VMA HARMAN INTERNATIONAL

VMA 1240
UL STD .60065 CONTAINS IC: 6132A-MB8811VMA 1718 W. Mishawaka Rd.,
CERTIFIED TO CSA STD.
C22.2 NO .60065 CMIIT ID: 2016DJ2941 Elkhart, IN 46517

CSR-V
CD /OPTICAL
SPK 1 + 2 VIRTUAL

LEVEL

Figure 2.6.1 Wiring Audio System

Typical input and output connections are shown in Figure 2.6.1.

INPUTS: Connect input wiring for both channels using either the RCA or the
Euroblock input for each channel.
OUTPUTS: You may use either low impedance or high impedance speakers. Always
be sure to maintain the proper polarity when wiring speakers.
-PX*NQFEBODF4QFBLFSTTIPVMECFESJWFOVTJOHUIF QJOTPGUIFBNQMJmFSPVUQVU
DPOOFDUPS5IFNJOJNVNJNQFEBODFBOBNQMJmFSDIBOOFMDBOESJWFJT0INT
Therefore, you can connect up to four 16 Ohm speakers, two 8 Ohm speakers or one
0INTQFBLFSUPBOBNQMJmFSPVUQVUDIBOOFM
High Impedance Speakers should be driven using the appropriate (70V or 100V) pin
UPTQFBLFS BOEUIF$0.QJOUPTQFBLFS  PGUIFBNQMJmFSPVUQVUDPOOFDUPS5IF
minimum impedance that can be driven from each output is provided in Appendix
A. Note that the HI-Z switch must be ON in order to provide audio to the high
impedance outputs.
WARNING:%POPUDPOOFDUUPCPUIMPXJNQFEBODFTQFBLFSTBOEIJHIJNQFEBODF
TQFBLFSTGSPNUIFTBNFBVEJPPVUQVUDIBOOFM

Table of Contents
13
 VMA 1240 Service Manual
Version A - 03/19

3.2 Input Routing

The two-channel models, VMA260 and VMA2120,
include a default routing of Input channels 1-3, Music
BOEUIF#MVFUPPUI64#TPVSDFUPBNQMJmFS*OQVU
DIBOOFMTBOE.VTJDBSFSPVUFEUPBNQMJmFS
The user may take any input and have it routed to
both outputs by selecting the appropriate switch. For
example, if you set switch 1 to ON, Input 1 will be
routed to both AMP1 and AMP2.

&RQÀJXUDWLRQ6HWWLQJV
"%*1TXJUDIJTBWBJMBCMFGPSFBDIPVUQVUDIBOOFMUPDPOmHVSFUIFVOJUUPZPVS
TQFDJmDTZTUFN

3.3.1 70V/100V Output Selection

8IFOUIJTTXJUDIJTJOUIFi0''wQPTJUJPO UIFBNQMJmFSJTDPOmHVSFEUPESJWFMPX
impedance speakers, (4 Ohms ,minimum) The 70V/100V switch will activate the built-
in output transformer allowing the unit to directly drive 70V or 100V speaker systems
when connected to the appropriate output terminals. As an added feature when
driving the high impedance speakers, the system automatically apply a 70Hz high
QBTTmMUFS

3.3.2 Chime Function

Turning chime ON will enable a chime sound 1-70V/100V Output OFF ON
2-Chime OFF ON
CH1 Settings

at the onset of an announcement when priority 3-Input 1 Line/Mic LINE MIC

muting is invoked. (See section 3.5, Priority 4-Input 2 Line/Mic LINE MIC
Muting, on the following page.) 5-Input 2 Phantom OFF ON
6-Input 3 Line/Mic LINE MIC
7-Input 3 Phantom OFF ON
8-Not Used NC NC

3.3.3 Line/Mic Gain Switch

Additional gain is available for use with sources,
in particular microphones, that have low output levels. Switching to MIC position
activates 48dB additional gain. Use only when necessary as the added gain may
cause higher noise levels.

3.3.4 Phantom Power

1IBOUPNQPXFS 7 DBOCFBQQMJFEUPTQFDJmDNJDJOQVUTCZUVSOJOHPOUIF
appropriate Phantom Power switch.

Table of Contents
14
 VMA 1240 Service Manual
Version A - 03/19

3.4 VOX Function

Voice activated ducking is available on input channel 2 of the VMA160, VMA1120
and VMA1240. The feature is available for both input channels 2 and 5 of the
VMA260, and VMA2120. The audio input level required to activate ducking is set
using the trim pot on the rear panel. Adjusting in the counterclockwise direction will
reduce that level while the full clockwise setting will disable the VOX function.

3.5 Priority Muting

VMA160, VMA1120 and VMA1240 may use Input channel 2 as a priority channel,
muting all other channels when pins 4 and 5 are shorted using a switch closure.
The VMA260, and VMA2120 lets Input2 operate with priority over all inputs into
PVUQVUBNQMJmFS$)4JNJMBSMZ *OQVUDBOFYFSDJTFQSJPSJUZPWFSBMMJOQVUTJOUPPVUQVU
BNQMJmFS$)*OQVUXJMMIBWFQSJPSJUZPWFSCPUIBNQMJmFST$)BOE$)JGUIF
routing DIP switch #2 is set to ON.

3.6 Remote Volume Control

Remote volume control can be implemented using a CSR-V controller connected via
an Ethernet cable to the RJ45 connector on the back panel. For the VMA260 and
7." UIFSFBSFUXPDPOOFDUPST POFGPSFBDIBNQMJmFSPVUQVU

Table of Contents
15
 VMA 1240 Service Manual
Version A - 03/19

3.7 Media Player

3.7.1 Bluetooth Operation

To activate Bluetooth, perform the following:
1. 1SFTTUIF#MVFUPPUI,FZVOUJMUIF#MVFUPPUI*OEJDBUPSCFHJOTUPnBTI
2. Enable Bluetooth of your source media player and search for “JBL
COMMERCIAL (XX)”. Establish a connection. (Note that the “XX” represents
the last two digits of the MAC address which allows the user to have multiple
systems in close proximity.)
3. 0ODFDPOOFDUFE UIF#MVFUPPUI*OEJDBUPSXJMMTUPQnBTIJOHBOESFNBJO
illuminated.
4. Press the VOLUME UP/VOLUME DOWN keys to increase or decrease the
volume.
5. Press the NEXT key to jump to the beginning of the next track.
6. Press the PREVIOUS key once to jump to the beginning of the current track or
twice to the previous track.
7. Press the STOP key to stop playing. (Note: This may not work for some
Bluetooth devices.)
8. Press the PLAY/PAUSE key to pause or resume playing.
9. To disconnect, either press the Bluetooth Key or disable Bluetooth at the media
player source device. (Note: Play will resume automatically upon reconnect if
disconnected by pressing the Bluetooth Key.)
10. Press the REC key to start recording. (Note: Media player signals are not
recorded.)
Note:#MVFUPPUITJHOBMJTNVUFEXIFOCSPBEDBTUJOHUIFDIJNFUPOF

3.7.2 USB Operation

1. *OTFSUB64#%SJWFUPUIF64#"VEJP*OQVUBOEUIFOVNCFSPGGPMEFSTBOEmMFTPO
the USB Drive will be displayed.
2. Press PREVIOUS or NEXT Key to scroll the playable media.
3. Press the VOLUME UP/VOLUME DOWN keys to increase or decrease the
volume.
4. Press the REPEAT Key to enter different repeat modes:
• REPEAT CURRENT – Repeat the current track.
• REPEAT ALL – Repeat all tracks.
• 3&1&"5"--.JO.FTTBHFo1MBZUIFUSBDLXJUIUIFQSFEFmOFEOBNF 
“MESSAGE_1.mp3” every 30 minutes while repeating all other tracks.

Table of Contents
16
 VMA 1240 Service Manual
Version A - 03/19

• 3&1&"5"--.JO.FTTBHFo1MBZUIFUSBDLXJUIUIFQSFEFmOFEOBNF 
“MESSAGE_1.mp3” every 60 minutes while repeating all other tracks.
• REPEAT OFF – No repeat.
5. Press the PLAY/PAUSE key to pause or resume playing.
6. Press the STOP key to stop playing.
7. Press the PREVIOUS Key once to jump to the beginning of the current track or
twice to the previous track.
8. Hold down the PREVIOUS Key to rewind.
9. Press the NEXT Key to jump to the beginning of the next track.
10. Hold down the NEXT Key to fast forward.
11. Press the REC key to start recording. (Note: Media player signals are not
recorded.)

3.7.3 Additional Media Player Information

Bluetooth playback will always have priority over USB.
The default media player volume is maximum.
USB and Bluetooth signals cannot be recorded.
While playing from the USB or Bluetooth source, the signal being played is
interrupted momentarily when a chime tone is sounding in another channel.
Hidden functions are available by pressing and holding a media player key for more
than 1 second then pressing and holding the Bluetooth key along with it.
• RECORD (>1s) + BT Displays the BT MAC address
• 4501 T  #5  %JTQMBZTUIFmSNXBSFWFSTJPO
• PLAY (>1s) + BT Illuminates all dots in the display
• REPEAT (>1s) + BT Factory Reset

3.7.4 Firmware Upgrade Procedure

1. 1MBDFUIFmSNXBSFmMFi NDTwPOUPBCMBOL64#%SJWF
2. Insert the USB Drive.
3. Display will show “USB UPGRADE”.
4. Wait until display shows “USB SUCCESS” and the display turns off.
5. Power off the unit.
6. Remove the USB Drive.
7. 1PXFSPOUIFVOJU UIFVQHSBEFQSPDFEVSFJTmOJTIFE

Table of Contents
17
 VMA 1240 Service Manual
Version A - 03/19

4.0 Troubleshooting
&21',7,211RSRZHUWRWKHPL[HUDPSOLÀHUVRWKDWWKHSRZHU/('LVQRW
illuminated.
1044*#-&3&"40/5IFNJYFSBNQMJmFSJTOPUQMVHHFEJOUPUIFQPXFSPVUMFU

CONDITION: No sound or low sound.

POSSIBLE REASON: The input signal is not present or at a very low level.
POSSIBLE REASON: The Master Volume control is turned down.
POSSIBLE REASON: A CSR-V is connected and turned down.
POSSIBLE REASON: Mixer channel inputs are turned down.
POSSIBLE REASON: A Priority switch is closed, muting all except the priority input.
POSSIBLE REASON: The 70V/100V switch is OFF while using the 70V or 100V
outputs.

CONDITION: Distorted sound.

POSSIBLE REASON: Input signal level is too high. Please turn down the input level
DPOUSPMT/PUFUIBUUIFNJYFSBNQMJmFSTIPVMEOPUCFPQFSBUFEBUBMFWFMUIBUBMMPXT
the clip indicator (red ring around the Master Volume) to be constantly ON.
POSSIBLE REASON: Master Volume is too high.
POSSIBLE REASON: MIC/LINE switch is in MIC position when using a line level
source.

Table of Contents
18
 VMA 1240 Service Manual
Version A - 03/19

Block Diagram - VMA160, VMA1120 & VMA1240

   
  



    

  !



  
 



   

 

"   

   











 



 


!
"  
 
 





 





 


 

 



Table of Contents
19
 VMA 1240 Service Manual
PCB Boards Version A - 03/19

B3&%$6<90$B&+B)5217B3$1(/

B3&%$6<90$B&+B)5217B3$1(/

20
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

B3&%$6<90$B&+B)5217B,1387 B3&%$6<90$B&+B)5217B,1387

22
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

B3&%$6<90$B&+B5($5B,1387

B3&%$6<90$B&+B5($5B,1387

24
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

5087031_PCB,ASY,VMA1240 _AMP

5087031_PCB,ASY,VMA1240 _AMP

Table of Contents
26
 VMA 1240 Service Manual
Version A - 03/19

5087033_PCB,ASY,VMA1240_PSU

5087033_PCB,ASY,VMA1240_PSU

Table of Contents
28
 VMA 1240 Service Manual
Version A - 03/19

B90$&+32:(56:,7&+

B90$&+32:(56:,7&+

30
Table of Contents
 VMA 1240 Service Manual
Schematics Version A - 03/19

     
5(9,6,215(&25'

/75 (&212 $33529(' '$7(

,1387 95
& 5  .$ 
,1
>@
X .
9 

Y X)
&
5
 

' .
& 4 &
'
1,
 & 1, 1,


8$
 ' 6
 5
1,
7/ 9

*
5

1,
5

5
$*1' & 4 &
1,
5 5
5
0,;B&+B,1$
' 6 >@
$*1'

,1387

*
95
& 5  .$  5 5
,1
>@ 0 0
X .
9 
Y X
&

5
 

.

 &


8%


1,
7/ 9
& &
1,
5 5
$*1'

9 8

9 X
&

&
5

,1387 $*1' $*1' $*1'

95
& 5  .$ 
,1 0,;B&+B,1
>@ >@
X . & 4 &
9  1,
1,
1,
Y X
&

' 6
5
  5

*
.
& 4 5 &
1,
5 5
 &
 0,;B&+B,1

8& ' 6 >@


1,
7/ 9
9

*
1,
5

5
$*1'
5 5
5 9

1,
1, 1,

,1387 95 $*1'

5
9$

1,
% ,1
& 5  .$  %

5
0,;B&+B,1 4
>@ >@ 1,
X .
1,
9  5
5
Y X

1, 4 4

&

1, 1,
5 5 1,
  &+B&75/B
. >@
5

1,
 & 1,

&


1,

1,

8'


&

&

1,
7/ 9
$*1'
$*1' $*1'
1,
5

5
$*1'
5 9 9
$*1'
086,& &
95
.$
5  
06
0,;B&+B06
>@
X . >@
9  9
Y X
&

&203$1<
5
 

$ .
$
Y X

8$ 7,7/(
X Y


&

&
&



90$)URQW3DQHO &+
 
1 3

 8(
 8& '5$:1 '$7('

1,
'UDZQ%\! 'UDZQ'DWH!
Y X
X Y

&) 9 $*1'  $*1'

&

&

&)
1,

7/
5

 5
 &+(&.(' '$7('
 $*1' &2'( 6,=( '5$:,1*12 5(9

 5
&KHFNHG%\! &KHFNHG'DWH!
8% 48$/,7<&21752/ '$7('
&)
$*1' $*1'
9
4&%\! 4&'DWH! &RGH! $  
5(/($6(' '$7('
5HOHDVHG%\! 5HOHDVH'DWH! 6&$/( 6FDOH! 
6+((72) 

32
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

     
5(9,6,215(&25'

/75 (&212 $33529(' '$7(

' 9
'

9 X
&

8&

9 X


&
&)
$*1'

9

& &
0,;B&+B%7
>@

&
9 S

9 S
&
5
%786% 5
&
N
X 9 N
5 5 8$
%7,1B/  & 5 8%
>@  &
 
N N 
 
 N
X 

&) 9 1,
&) 9
5
$*1' $*1'
5
G%
5

N

% %

5

1,
5
%7,1B5
>@
N

$*1' $*1'

&203$1<

$ 7,7/(
$
'5$:1 '$7('
90$)URQW3DQHO &+
'UDZQ%\! 'UDZQ'DWH!
&+(&.(' '$7('
&2'( 6,=( '5$:,1*12 5(9
&KHFNHG%\! &KHFNHG'DWH!
48$/,7<&21752/ '$7('
4&%\! 4&'DWH! &RGH! $  
5(/($6(' '$7('
5HOHDVHG%\! 5HOHDVH'DWH! 6&$/( 6FDOH! 
6+((72) 

33
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

     
5(9,6,215(&25'

/75 (&212 $33529(' '$7(

' '

5
0,;B&+B,1$
>@
. S
&
5 .
0,;B&+B,1 5
. 5
>@
5 .
0,;B&+B,1 .
>@
5 .
$*1'
0,;B&+B06
>@ 5
 &
5 . 
 &+B)5217
8&
& 0,;B&+B%7
>@
5 .
. 

X
>@
&
7/ 9
0,;B&+B,1 & S
>@
9 S
& &
5 $*1'
5 9 X
%7287B&+
N >@
.

 5

 
8$ 
 
 N 8%

7/ 


5 5 5 $*1'
5 5 . . . 7/
. .

9 S
$*1' 5

&
.


9

8$ 


$*1' 5
    9


>@
.
5 &
0 X
9 4 
00%7 5


' .
5
% &+B35,25,7< 
%$7&

5 
%
. 4 8%
>@ 
00%7  

5


9
$*1' $*1'
9 X
&

9 X


8(
&
 
1 3

8(
1-00 $*1'


$*1'
Y X


& X

 

&

8'
&

7/ 

&203$1<
7/

$ 7,7/(
$
$*1'

'5$:1 '$7('
90$)URQW3DQHO &+
'UDZQ%\! 'UDZQ'DWH!
&+(&.(' '$7('
9 &2'( 6,=( '5$:,1*12 5(9
&KHFNHG%\! &KHFNHG'DWH!
48$/,7<&21752/ '$7('
4&%\! 4&'DWH! &RGH! $  
5(/($6(' '$7('
5HOHDVHG%\! 5HOHDVH'DWH! 6&$/( 6FDOH! 
6+((72) 

34
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

     
5(9,6,215(&25'

/75 (&212 $33529(' '$7(

' '

&$
1,

& 8

5 95 .%' 5

 

. &$ 1, .


5

& N
8 9 S
5 &5
& 3   5
& . 0
N
8% &
 &
&$ 1, & 
 


  

 
&+B)5217 
>@  X &

.$

.%' 8$ X &) 9

95
$*1' 9 X 9 X 9 X &+B$03
95 9 & & & >@
&)


9 X


5 9
5 N


N


$*1'
$*1'
$*1'
4
00%)-
9 X

' 6
&

 9

*
8&
9 X


&

&)
'
$*1' 0
N 5
5 1,


5 .
&+B+,=
>@
% %

9 X
5

&
1,

9


$*1'

&203$1<

$ 7,7/(
$
'5$:1 '$7('
90$)URQW3DQHO &+
'UDZQ%\! 'UDZQ'DWH!
&+(&.(' '$7('
&2'( 6,=( '5$:,1*12 5(9
&KHFNHG%\! &KHFNHG'DWH!
48$/,7<&21752/ '$7('
4&%\! 4&'DWH! &RGH! $  
5(/($6(' '$7('
5HOHDVHG%\! 5HOHDVH'DWH! 6&$/( 6FDOH! 
6+((72) 

35
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

     
5(9,6,215(&25'

/75 (&212 $33529(' '$7(

' '

9B/('

5
. 6,*1$//(' *51
5 5
N N 4
00%7
X)
&

6,*B/('B
>@

& &
3($./(' 5('

5 5 5 5

5 5
5 5 5 
 

/(' /(' /(' /('

/(' /('
%/%7$7 %/%7$7 %/%7$7 %/%7$7
%/%7$7 %/%7$7

9B/('
5 

. 
8%


/0

5 
. 

4 4
4 1
 1
1 



9 X

9 X

&

&
9 X

% %
&

$*1'

9 9B/('

5
N
N
5
&+B&/,3 

>@ 
8$


/0
5
N
&203$1<

$*1'

$ 7,7/(
$
'5$:1 '$7('
90$)URQW3DQHO &+
'UDZQ%\! 'UDZQ'DWH!
&+(&.(' '$7('
&2'( 6,=( '5$:,1*12 5(9
&KHFNHG%\! &KHFNHG'DWH!
48$/,7<&21752/ '$7('
4&%\! 4&'DWH! &RGH! $  
5(/($6(' '$7('
5HOHDVHG%\! 5HOHDVH'DWH! 6&$/( 6FDOH! 
6+((72) 

36
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

%7B.(<
)% P+=N
>@

$'B.(<
90
9 ,& 95

>@
. 5 9'' 5(6(7
>@  
0$,1B32:(5

'

'
P+=N )%


>@
8 $,&*;$ 9 ;(9 8 >@ >@

>@
%7B6'$
5 >@
& S '*1'

*1'
,1 287 ,1 287 %7B6&/

&

&
5

)%
)% & S . >@

& X
8

5
'*1' 3&0

X &

&
'*1'

9 X
X &
'*1'

3

3
9 X

9 8

&
&

X &

S
5 . 5 .
*1'

5
&

&
'*1' )07 =(52$

*1'
 
X

.
.
& 5 . X & 5 . 5 .

S

'*1' 5 0 '*1' '(03 9287/ %7,1B/

S
'*1'  
& X 5 . & X 5 . 5 .
>@
< '(03 92875 %7,1B5


$*1'  

& S
& S

& S
&

& S
>@

5
'*1' 0+]

& S
 5  &
& X

5
>@  087( 9&20 
'*1' 5 
)% 6&. $*1' X 9
 
5 5 
 '*1' '$7$ 9&&
 
& X 5  &X 9
& S $*1'



%&. 1&

5

5
 


& X &


5 






9 X


X
'*1' '*1' '*1' '*1' '*1' /5&. 7(67

)%
  X $*1'

5
&
.

.

&

.
S

5
9

5
)%
$*1'

5

5
5
&

5
'*1'

5

5

5

5
5
)%
GHEXJ

9
5
5

5






















































$',1 

$',1 
17567






'*1'
567(7 9$
7'2*3

$',1

3//9''

3//966

3//9''

3//966

3//9''

3//966

86%966

86%'

86%'

86%9''

,2966

,29''

;2

;,

7(67

,2966

17567

5(6(7

*3

*3

*3

*3

*3/5&.

*3'$7$

*3%&/.

*3

7&.
706*3
%7B/('
)% P+=N 7&.
 $',1 966  '*1' 706
>@ X
& 7'2
$',1

9 X &

86%32:(5  9''  *1'
>@ & S 7',
)% P+=N  $9'' 7'*3  9'' 0+&B&.

X
& X & S

)%

5

&
'>@   >@
 $966
'*1' *3 
5 
&S
 *3 *3  0+&B6/
5  >@
8
6'5$0 0+&B4+
,&

&
 *3 

X
*3 &-&
$6&06$7,1 5  5  >@

9 X
$*1'

&
' '  0+&B6,1 X
 *3 '*1' & %7287B&+
5 1, >@ 5 5 5
  >@
' $' ' ' 0+&B5&.  
 ' $   *3  &.6B 5,1 5
'
'  ' $ 
$ 
$'
$' ' ' 
5 1,1, >@
0+&B6&.  
5 5
'  ' $'
 *3
5 1, >@
&.6B /,1
 ' $  $*1' 5 & X

0&8
' $  $' ' '  &7   5
'  ' $'
 *3
5  >@
',) &.6
$  5
 ' 5 . 5 1,

& S
' $' '   

S
$  ' 
 '  5(6(7 9&20

S
'/5&.

S
' $  $'
'  ' $' ' 5  5 5

X &
$  '   
'  ' $'
 '%&. 6&/. $*1'

&
$*1'

9 X
 ' $  & S 5  5 5

&
' $' '  

&

&
$$3  ' 
 '  '0&. '*1' 0&/. 9>9$@

1, &
1, &
' $' X

3
 ' $ 

3
5

1, 5
' $' 5  

&
'  ' 1&$ 
$'
'*1'  9'' 8 ,9266  '*1' & /5&. B>9'@
 ' %$$  & X 5 
' $'  

&
%$$ 966 
'  '  ,29'' 6'72 '*1'
' 5 & S '*1'

&
 5 5 &.( 0$,1B087( 5 $*1'

X
&.(   *3 ''$7$ 
 &/. 5 
1& &/.  )%
5
>@ & S
5 8'40 ' ' -$
 8'40  5  *3 
5 /'40 5 
 9'' /'40 
5 5 &61 ' '
%;
-% -PPSLWFK
 9'' &6   *3  $*1'
5 5 5$61 5  '*1'
9'' 5$6 
5 5 &$61 ' ' 
&$6   *3
5 5 :(1 5  >@'%
:(

72%702'8/( 0%&%
 ' 5 
3

 '  &1
 9''4
&

*3
>@'% %7B6'$
 9''4 ' 5  '%
>@ 72%702'8/(
 9''4 1HDU8  ' *3 
>@ %7B6&/
9''4  5  >@ 
'
 9664   ' *38$577;B'$7$ 
>@'%
%7B6'$
 966 9664 
' 5  
 966 9664   ' *38$575;B'$7$ 
>@'%
%7B6&/
966 9664 
' 5 
'*1'
'*1'
 ' *38$577;B'$7$  '*1' *1'


))&3,1
' 5 
 ' *38$575;B'$7$ 
%7B5;
$' 5  
 $' *3  '*1' *1'
$' 5  
 $'($' *3+8$57&76  %7B7;
$' 5  
& S
 $'($' *3+8$5757&  %7B&76
5  
& X
 ,29'' *3+8$57'2  5 . %7B576
&
&
&
&
&
&
&

&
&
&
&
&
&
&

5 
5 .

'*1'  ,2966 *3+8$57',  5(6(7
9 X


&

$'
 $'($'

 $'($'

 $'($'

 /'40($'

 8'40($'

 ($'*3

 ($'*3

 ($'*3

 ($'*3
9&&
S
S

 $'($' 
%$($'

 %$($'

 (:(1*3

 (2(1*3
S

S

*3
X
X

,29''

,2966
S
S
S

 $'($'

 $'($'

 $'($'

 $'($'
X

X
X
X
X

6'&61

9''

966

6'&/.
5$61

&$61

$'
&.(

:(1

 (&61

 *3
 $'($' 

& X
*3

 *3
$'($' *3
)%

3

3

3
'*1'






















3
5




9 X

&

X
&
&
'*1'

&
&

&
'*1' '*1' '*1' &1
'*1'
$'

$'

$'

$'

$'

/'40

8'40

5$61

&$61
&.(

&/.
$'

$'

$'

$'

$'

&61

:(1

%86
5
5

9
5

'*1'
5

5
& S

>@
& X

5 5 5
& X

& S

'*1' 72/&'

5
5

5

5

'*1'
5

5

90 )% 5 
'*1' >@

&S
&S


& X
6(5,$/)/$6+ '*1'
'*1' 1, 5
/&'B56 
>@
0$,1B32:(5

/&'B:5 
0$,1B087(

5   
9

&6 9&& >@

/&'B56

/&'B:5

/&'B(

>@

5 . /&'B( 



/&'B56 5   
>@

>@

>@

>@

>@

'2 ,2 +2/' >@

>@
/&'B:5 .  5  '% 
>@

5 
>@ :3 &/. >@
/&'B( 5  
>@ '%
 *1'  >@
'% ', ,2 '*1'
>@ 9 '% 
'%

72/&'
(14+ >@
>@
'% 8 1, 5 '% 
1,
&

&

&

>@
&

>@ &+B&75/B
&

5

5

5

5


5

'*1' >@ '%

&
&
&
&
&
&

8
& >@

&
1,
1, 
1, '%
1,
.

.
1,

>@
.

.
1,

S

S
1,

9
.

3
3
3
3
3
3

'*1'   '% 
9&& 4 &+B%7B6: >@
  '% 
4 4 &+B&75/B >@
5 1, 
0+&B6,1   9B/&'

>@
>@ 1, 6,1 4 &+B&75/B$

&
&
&
&
&
&
  
'*1' * 4 &+B&75/B%
0+&B5&.
>@ 5 1,  5&. 4 

3
3
3
3
3
3
&+B&75/B
'*1'
5 1,
0+&B6&.  6&. 4  &+B&75/B
>@
 6&/5 4  &+B%7B6:
'*1'
 6'2 *1' 
'*1' '*1'

37
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

     
5(9,6,215(&25'

/75 (&212 $33529(' '$7(

86%9

0(
90
' >@
'

.


5



4
66
'
5

5

6&)
5

5
.
86%32:(5

4
>@

& 8

5
.
'*1'

& &

%7B.(<
5 . . . . . . . >@
$'B.(<
>@ 5 5 5 5 5 5 5 5

8
5(3(7,7,21

3/$<3$86(

/5&0&$7*
92/

92/

5(2
6.,3
6723

6.,3

%7
S
&

90  

 
'*1'

 


% 4 
%
 6(/ '0  1, 5 4 -
1, 5 5
&

' 
1,

 *1' 1, '

>@ >@ 5 5
90  9&& '3 1, 5 ' ' 
>@ >@ >@

86% $7<3(
1, ,& &
1,

S 9

S 9
&

&
5

5
.

5 X '*1'

&7
1, >@ 9
'*1' '*1' '*1'
'*1'
&+*1'

90
5
.

%7B/('

5 &203$1<
'
.
%7B/('
>@ %7/('

$ 4
$
5

00%7
1,

7,7/(

'5$:1 '$7('
90$)URQW3DQHO &+
'*1' '*1' '*1' 'UDZQ%\! 'UDZQ'DWH!
&+(&.(' '$7('
&2'( 6,=( '5$:,1*12 5(9
&KHFNHG%\! &KHFNHG'DWH!
48$/,7<&21752/ '$7('
4&%\! 4&'DWH! &RGH! $  
5(/($6(' '$7('
5HOHDVHG%\! 5HOHDVH'DWH! 6&$/( 6FDOH! 
6+((72) 

38
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

     
5(9,6,215(&25'

/75 (&212 $33529(' '$7(

)5217 3$1(/ 72 ,1387 )5217 3$1(/ 72 $03 &+

' 90
90
'
-
- &213
 ,1
>@ &213
 ,1 72)52173$1(/
>@  
 ,1
>@  

Y X
 06 9 9$ 9 9 9B/(' 9 9 &
-

&
>@  9
 X
72$03&+
72,1387
 9
'*1' 9B/&'
$*1'  9$
-
 9
'*1'
 '*1'

 '*1'

 9

 9B/('



 9 63 63 63 63


&  &+B+,= >@
&+B+,=
&
 ',3B ',3B

 >@

 &+B&/,3 &+B&/,3
>@
 6,*B/('B 6,*B/('B
>@
 &+B35,25,7< &+B35,25,7<
>@
 0$,1B32:(5 MAIN_POWER
[6]
 0$,1B087( MAIN_MUTE
[6]
 0+&B6/ 0+&B6/
>@
 0+&B&. 9 9
0+&B&. -
>@
 0+&B4+ 0+&B4+
>@
 $*1' 72)5217,1387
 ',3B
 &+B$03 >@
&+B$03 
>@








'*1' &+*1'
 ,1
>@
%  %
$*1'

&+*1' $*1'
9
9 9$
9 X
9 X

&
&

&

9
X

9 X
X 9

&
&

&
&

9
9 X
X
9 X

$*1'
9 X

&
&

&

9
X $*1'
$*1'
9

5 5

1, 1,

'*1' &+*1'
$*1' &203$1<

$ 7,7/(
$
'5$:1 '$7('
90$)URQW3DQHO &+
'UDZQ%\! 'UDZQ'DWH!
&+(&.(' '$7('
&2'( 6,=( '5$:,1*12 5(9
&KHFNHG%\! &KHFNHG'DWH!
48$/,7<&21752/ '$7('
4&%\! 4&'DWH! &RGH! $  
5(/($6(' '$7('
5HOHDVHG%\! 5HOHDVH'DWH! 6&$/( 6FDOH! 
6+((72) 

39
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

     
5(9,6,215(&25'

/75 (&212 $33529(' '$7(

,1387
-
&


' 76

7

S '
/
56  &
 9
 5 5 5
5  
66 
 RKP
N 5 N
6 & X
S 4 00%)-

' 6
8%


 ,1

*
5 0
 >@
& 
S
&)
/
$*1' &
9
5 5 5
 
RKP
N 5 N
X
',3B &
>@ 4 00%)-

' 6 S
&
$*1'
X

*
5 0

$*1'

& &

9 9
-

72)52173$1(/
9 ',3B 
>@



&
9 X
&

X 
 

8& ,1 
&) >@
& 
9 X


&

$*1' X

$*1'
5

% 5
%
9

&+*1'

8$





&)

$*1'

&203$1<

$
$ 7,7/(

'5$:1 '$7('
90$&+)URQW,QSXW
'UDZQ%\! 'UDZQ'DWH!
&+(&.(' '$7('
&2'( 6,=( '5$:,1*12 5(9
&KHFNHG%\! &KHFNHG'DWH!
48$/,7<&21752/ '$7('
4&%\! 4&'DWH! &RGH! &  
5(/($6(' '$7('
5HOHDVHG%\! 5HOHDVH'DWH! 6&$/( 6FDOH! 
6+((72) 

40
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

     
5(9,6,215(&25'

/75 (&212 $33529(' '$7(

,1387 73 73 73 73 73

9

',3B
>@

1,
5
9

N

N
5

5
' ',3B
>@ ,1
>@ '
X
' '
& &
-

5

N
&21(8523,1
9 9
$*1'

N
* 

5
9 S) P: P:
/
& &
&+B35,25,7<
9
X 5 5 5
  4 >@
 
RKP 9 S) 00%7
N  N 5
4 00%)-
&
  5
S N
' 6
.


N

35,25 

5
 & & 5
8% 5

*

   
0 5 
7/  
. 8&  $*1'
 
*1'  & 9 X)  8$

$*1' S $*1' 7/ 
/
& 7/
9
5 5 5
 
RKP
9 N  N 92; &+
X 4 00%)- &
.=<
N 
' 6    
9 S) 9 $*1'
$*1' $*1' >@ 5 95 5
1, 92; &+
9 56953
&
N

&
5

*
4 0 5 5
00%7
5
$*1'
N 5
N

1
,1B377

'
>@

5 4
9 00%7
N

N
5
1,
5
$*1'
73 73 73

,1387 5 0 X

&
',3B
>@

+DR<X

*
&
3-& -
% 76 
' 6 $*1'
9 S)
%
 /
7
& 4 00%)-
9
56  5 5 5
  
 RKP
5
 N  N
66
 & X
6 S



 ,1
8$

&  >@
S 7/
/
$*1' &
9
5 5 5
 
RKP
N  N
X
4 00%)- &
5
9 ' 6
>@ 9 S) $*1'
5
*

9

&203$1<

5 0
$
$ &
X
&
X 7,7/(

90$&+,1387%2$5'
 

$*1'
1 3

 
  $*1' '5$:1 '$7('
 
& 8' 8%
X
8( 


 'UDZQ%\! 'UDZQ'DWH!
7/ 7/ 7/
$*1' $*1' &+(&.(' '$7('
9 & &2'( 6,=( '5$:,1*12 5(9
X &KHFNHG%\! &KHFNHG'DWH!


5 48$/,7<&21752/ '$7('

5
9
>@
9
4&%\! 4&'DWH! &RGH! & 
5(/($6(' '$7('
&&8'(&283/,1* 5HOHDVHG%\! 5HOHDVH'DWH! 6&$/( 6FDOH! 
6+((72) 

41
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

     
5(9,6,215(&25'
9
/75 (&212 $33529(' '$7(

1,
73 73 73

5
,1387 ',3B
>@

&
X ',3B$
>@
5 0

N

N
5

5
-

*
$*1' &
&21(8523,1
' ' 6
9 S) '
*  /
& 00%)-
4
9 &
   
5 5 5

  RKP
N  N S
& X
S
5

N
 5

 
8$ 
  ,1
&  8%
N 
S 7/ 
>@
/ 7/
$*1' &
9
5 5
  5
$*1'
RKP
N N
X 
4 00%)- &
73 73 73
' 6
9 S) $*1'
/

*
5&$3+2/(
5
 
RKP
N
 :+,7(  & 5 0

&
&,5&/(+2/(
&+*1'
S
&
 
6485(+2/( *1'
&
  $*1'
6485(+2/( - 5(' &
S /
X) 9
5
 
RKP
N

73 73 73

086,&
&

% -
/
9 S) %
5&$3+2/( & 9
9
5 5
 
RKP
 :+,7(  N N
&,5&/(+2/( & X
S
 
&+*1'
6485(+2/( *1'

 &

 
X

1 3
  
&  06
6485(+2/( 5(' 8&
 >@ $*1'
S 
8(
7/
$*1'  & 7/
/ 
&  X
9 $*1' 8'
5 
  
RKP 7/
N
X
$*1'

9

&203$1<

$
$ 7,7/(

'5$:1 '$7('
90$&+,1387%2$5'
'UDZQ%\! 'UDZQ'DWH!
&+(&.(' '$7('
&2'( 6,=( '5$:,1*12 5(9
&KHFNHG%\! &KHFNHG'DWH!


48$/,7<&21752/ '$7('
4&%\! 4&'DWH! &RGH! & 
5(/($6(' '$7('
5HOHDVHG%\! 5HOHDVH'DWH! 6&$/( 6FDOH!  
6+((72)

42
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

     
5(9,6,215(&25'

/75 (&212 $33529(' '$7(

' '

9

9
99
,1387 72 )5217 3$1(/
 9'' '  &+B+,=
>@ 9 9$ 9

 6'$ ' 
&+,0( &+B&+,0(
>@
,1387 72 $03 &+
-
,1387/,1(0,&
 6&/ '  ',3B
>@ 5(0$5.
&
,1387/,1(0,& X - ,1 
 5(6(7 '  ',3B & X >@
6: >@ 
',36: 9
72$03&+
',36:
,13873+$1720  ,1
>@

 ,17 '  ',3B
>@ 

,1387/,1(0,& &  ,1
>@

 $ '  ',3B
>@ &
X X 9 
,1387/,1(0,& 9  06
 $ '  ',3B$

& 9
>@
&
&
X

>@
&
,13873+$1720 X 9 
 &( '  ',3B
>@ 5(027(B
>@ 

& ,1B377 
$*1' & >@
& 5 5 5 5 X &+B+,= 
& N N N N X 9 >@
X X &+B&+,0( 
9
9 9 >@

$*1' 
',3B
>@
9  $*1'
',3 6: &RQILJXUDWLRQ $*1' &+B35,25,7<
>@

9 $*1' >@


&

1,
5

% -
-5-+5$
9$
>@
1,
$*1'
%
5(027(B &+*1'
>@

 5
3 
 0
&20 /
  
 &+B9 &+B9  SP1 3  0 0
RKP
 63287B3 3 
9 &
3 
7223;)05
J7
-

3 
S
5HPRWHB,QSXW


72$03&+ $*1'
&+ 3 
 &+ 
3 
 &+
3  &+*1'
&+ 
 6

 6

$*1'

1,
&
9 &+*1'

&+ 63($.(5+,=
&203$1<

$
$ 7,7/(

'5$:1 '$7('
90$&+,1387%2$5'
63 63 63 63 'UDZQ%\! 'UDZQ'DWH!
&+(&.(' '$7('
&2'( 6,=( '5$:,1*12 5(9
&KHFNHG%\! &KHFNHG'DWH!


48$/,7<&21752/ '$7('
4&%\! 4&'DWH! &RGH! & 
5(/($6(' '$7('
5HOHDVHG%\! 5HOHDVH'DWH! 6&$/( 6FDOH!  
6+((72)

43
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19
     
5(9,6,215(&25'

9, 9, /75 (&212 $33529(' '$7(

93 9,
&5 5
&5
1  R193
1
 5
9 
& 9 9
&)  &
5 5 
   &
. .  8& 


 


1 3
 &) 


 & 8&
8$ C151
 $*1'

'
4 5 8( & 1-00 X

'
R197  
30%(-  8& $:*:,5(


* /0' &
*  5  :% :$


4 5 $*1' /0
& 00%) & & 7+(50$/B 9 
' 
'

>@
1,
X
J101

6
 9

6
9
93 9,
72368%2$5'
5 5
127( 127( 9&& 
5 >@
&7B 
.
9 >@
$*1' 5 
. &
3 9&&>@ 

9&&
1
&5
5 >@

'
93
R103 0R 1, &5 5
5
DELAY_1 * 1 . :
[1,2] . 
&)
4 

R104 N.I 30%(- 

6

0$,1B32:(5 &
8% &5
>@ &
3 5 5 9 5
9 X
. . : 
9
$*1' : : :
9 5 5 5
. . &5
& .
66
3
C135 S 9 Over-current 2&B3527(&7,21B&+
>@
& Q106


4 4 4

Protection
9 & &5 3 4
3 ,*1'B 6& 1-:* 1-:* 1-:*
1 9 6&
R1004 . 9
&7B
C133 >@
&+B$03 (&
10u 50V R1001 C142
>@ . 9
 ,1 287   X 9 &5
 &5 1 4
 5 :
*
8 6<0  1 5 00%7
9 9 .
(& R1002  R1005 .
R100 8& & &855(17
NI . /0' :


. &+B&/,3 X 9

9


*1' >@
>@
9 5

9 

9 X
&5 5 5 &5 &5
C100 R1039 95 R1008


1  : . : . : 5 1

&

&
5 1

63.
NI 51R N &5 . .
. :
5 1 :
R1009
* 5
&5
R1006 . &5 :
: 5
. C134 Q 1  :

5/<37
5 4 . 127(
&7B 63.287

5/%
 &5  5
R1007 >@
9 1
C147 : 1 5 &5 5 5
72
R1003 220R
& X .

HS

:
&5
1
9 
:
5 5 :
IGND_1
:$
/ ,1387
3&%
&
5

5
9 2+0 : : X+
2+0


 >@ :$
>@

 CR6 1

 5 :%
R11 8%
5 &5 . -
1, /0' 1 1-00 5 5
  &5 &5 5 5 
CR130 1 
 &5 5 5 5 : : 5
*5281':,5(72&+$66,6
 1 9  :
 1 :   
C11  : :  :%
: :
J103
HS
1, 8$ 5
 5
. & 7223;)05
4 &5 .
$*1' ,*1'B 
&5 1 5 : X
5
1 . +=B63. 
. 9
& :
%,$6 X 9 5 5 5 :
 : . : . : 
,*1'B 5/%
327
&5 DC_TEST1 5/<37
9$ 9 5 [1]


*6*
95 .  +=B63.
& S)  &5
 : 4 4 4
1


1-:* 1-:* 1-:*

R1037 49.9K &5

C143
9 R1035 C148 100p 4 Q107 1
X) . & 6$ 6$
&5
$*1' 3
1 &5 9
R1040 N
$*1' 66
20K 9
R1033
5(027(B /0' 10k
 8$ R1010 5 5
 5
  93 5
 . .
>@   
 : :
 &5 5 :
R1034 20K 
1 . :
R1036 49.9k

8' /0'
&
C145 S) $*1' X &5
9 9
:
9$
R1011 .

9&&
,*1'B >@

% %
R1030 .


R1042
4
N
C1014 X)

N 1 9 9

R1038 

 
8$ 9


>@

/0 5
 DC_TEST1 5 &
[1] 5 5
R1032 . X) :
$*1' 5 :
00%7 4 . 9
.
. '&B3527(&7,21
>@
5 . &5
9$ 5
2&B3527(&7,21B&+ 00%7
>@

>@ 9

$*1' $*1' >@ .

9 4 AMP1_PROTECTION 
N

X) 1 [2] 5/$

. &

1
5/<37

&5
5 4 4 5 .

N
R24

2+0 00%7 00%7 '&B3527(&7,21 &+B+,= 00%7

&
>@ >@ >@ Q126
X) 5
9 .
R26

5 .
N R1 8% 5 4
 N 00%7
&855(17 
>@ 

DC protection
 
1-00
5
1 CR5 R22 N . 4
5 5
5
,*1'B .
X)
N

2+0 . 00%7

X)

>@ 9
90$ 90$ 90$
N R21

R23

,*1'B
&
&

5
4 1, 1, 1-:*
1/4W $*1'
R1028 0R 68R
DELAY_1
[1,2]
4 1, 1, 1,
9$
& R1029 N.I
X)
0$,1B32:(5
>@ &5
 4 1, 1, 1-:* 5
5/$
1 5/<37
R1043

R12
N
5
 4 1, 1, 1, 1,
. 1 $*1' &+*1'
$ &7B 


.
$
>@

8%

6,*B/('B
>@
4
55 1, 1, 5:
&5
R1044 /0 00%7
&203$1<
. R1045 55 1, 1, 1,
X)

N
5
.
R108 R109 N N 1.5K 7,7/(
&

$*1' $*1' $*1'

5 5 1, . .
'5$:1 '$7('
90$&+$03
$*1'

5 10K 1% . 15K 1% &+(&.(' '$7('

&2'( 6,=( '5$:,1*12 5(9

5 3.3K 1% 3.3K 1% 3.3K

48$/,7<&21752/ '$7('
 
5(/($6(' '$7('
6&$/(

6+((72)


44
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19
     
5(9,6,215(&25'

/75 (&212 $33529(' '$7(

+3.3V

$03 &+ 72 )5217 3$1(/

9 +3.3VA 9 9 9B/(' 9 9
-
72)52173$1(/
8


 5 +&'
N 5
 N
& &
 X
X
 3/ 9&&  9

+3.3V

' 
 &3 &( 
'*1'
'

 ' ' 
 5 5 5

N
5
 N N N
 ' ' 



,1B377
' '  &+B92;
 &+B+,= >@
>@
 ',3B
>@

' '  &+B&+,0(

>@
 &+B&/,3
>@
 4 '6  5
 6,*B/('B
>@ 5
 &+B35,25,7<
>@  *1' '*1'
 MAIN_POWER 4 
[1]
 MAIN_MUTE
+3.3V 9
5(9B


 5 5
'*1'
 N 1,
R4 NI 4



1

R8 NI &+B$03
>@ &+B35,25,7<

>@




,1B377
 >@

&+*1' $*1'
'*1'

& &
&200217+(50$/0$1$*(0(17
9
7+(50$/B 9
7,0('(/$<&,5&8,75<
>@

5   -
176$;5)(%
- 9)$1


5 8
9
2 . C1  
/0 220u
P5  
3 35V
*1'B)$1 CR105 9)$1
1 5 .

5 . R2 . R3 47k

*1'B)$1
2
5
R6
3 P6 . R7
.
5
&5 +30V
IGND_1 1
R5 [2]
.
5

. C2 &5
8$ 8&
 1,
5 &5 $60 CR3  $60
 1 



 1
2 8% &5
& /0 1,
3 P7 
X 9 
 IGND_1


IGND_1
2 IGND_1
5 .
3 P8
 $60
5 7+(50$ 

CHGND . 1 
  
8%
% 9
/('
CR2
IGND_1
%
&
$03 &+ 72 ,1387 5
. 3

$03 &+ 72 368 DELAY_1

[1]
>@
9

8$ 
- 9 9$ 9 9 9 /0 & 9 C103
5  8&
9  
9 9 9 9 9B/(' 9 .  
  /0
72,1387 
 - 5 5
&5 5
 72386%2$5' 1 
. 0 ,*1'B


 4
 00%7
5 NI  AMP1_PROTECTION
 5 [1]
&
 .
X
 9


 &5 &5
&5
 5(027(B 1 1
>@  1
 ,1B377
>@  ,*1'B
 &+B+,=
>@ 
 &+B&+,0(
>@
 &+B92;
$*1'
>@ 9
 ',3B
>@

9 9$
& & 8
9 X

 &+B35,25,7< /069
X) X)
&

>@
 $*1' 9 9
&+*1'
,1 287
&
& &
*1'

100u &
16V X X
& & 8)
9 X

X) X) 9

&

9 9 $*1'

$ $*1'
$
9

&203$1<

7,7/(

'5$:1 '$7(' 90$&+$03

&+(&.(' '$7('
&2'( 6,=( '5$:,1*12 5(9

48$/,7<&21752/ '$7('
 
5(/($6(' '$7('
6&$/( 6+((72)
 

45
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19
6 5 4 3 2 1
REVISION RECORD
LTR ECO NO: APPROVED: DATE:
F2
DC GBK25G
+VCC1
J2 1 2

R1
2 C9 NOTE 3
D2 1
47K
AC SEE NOTE 2 2
1/4W
1 4
P1 P3 P4 P2
+ - CT-1 3
J7
R2
C32 4
3Pin 3.96mm 0.1uF
AC C10
47K
3 F3
250V 1/4W SEE NOTE 2
1 2

-VCC1
CH1 AMP POWER SUPPLY
D NOTE 3
D
CHGND

F8
DC GBK25G J12
+VCC2
J10 1 2 +5VM CON-03P
PC1 PC2 TO FRONT PANEL
R5
2 C28 NOTE 3
D3 1 1
47K
AC 2 2
1/4W SEE NOTE 2
W1 F1
1 4 DGND
+ - CT-2 3
J11
3
1 2 R6
L C33 4
3Pin 3.96mm
3Pin 3.96mm 0.1uF
AC C29
+V_LCD
47K
W3 NOTED 3 Power switch C37
3 3 F9
250V SEE NOTE 2
1/4W +5VM
N 2
1 2 J6
0.47uF 1
W2 275V X2 -VCC2
CH2 AMP POWER SUPPLY NOTE 3 TO POWER SWITCH

AC INLET
J1
ALL N.I. FOR 1-CH VERSION 1

2
W5 C13
0.01uF
C12
0.01uF ! To Transformer AC INPUT
CHGND DGND
250 Y1 250 Y1
R15 FUSIBLE D10
0.22 1/2W 1N4007 U1
1/8W

1/8W

IN OUT +15V

SEE NOTE:
CHGND CHGND 7815
R30

R31

GND J8
D11 +V_LED CON-09P
1N4007 D4 R14 100R
C3 C5
C1 D28 TO AMP CH1 BOARD
AC POWER INPUT C11 1000uF 1000u C24
1W
J3 104 47u C21 +30V 1
0.1uF W1A 8.2V
1N4007 25V 104
35V W4 16V
1 250V 2
+15V
2 3

1. D3,R5,R6,C28,C29,C30,C31,C33,F8,F9,J10,J11 NO USE IN CSMA2260V,CSMA2120V 3

D12
D7

3.9V
C14
47u
AGND 4

3Pin2.54mm C4 -15V 5
1N4007 16V
1000uF +27V 6

2.
AGND
C 35V -4V 7 C
YEL-WHT-YEL
-4V
C2
104 +V_LED 8
R8 D5 C6
C25
470 1000u 9
104 +5V
1W
1N4007 25V
R16 FUSIBLE D13 GND
0.22 1/2W 1N4007

CSMA160V CSMA1120V CSMA1240V CSMA260V CMA2120V IN

7915
OUT -15V
J13

TO INPUT BOARD
63V 63V U2
100uF 1
100uF +15V
C20
D27 PRE-AMP POWER SUPPLY
C19 2
1N4007
-15V 3

D26 +5V 4
1N4007 AGND

C9, C10 2200uF/50V 3300uF/63V 4700uF/87V 2200uF/50V 3300uF/63V D8

2N5551 R10
1N4007 10R 1/4W
C28, C29 P=10mm P=10mm
Q1

P=10mm P=10mm P=10mm

+27V

1
2
D21
1N4007 R9 2N5551 R11 10R

3
4.7k
1/4W PC6 PC5 PC4 PC3
R7 1/4W
C39
100uF
Q2 N.I R13
200K C17
N.I C26
100uF 20K W7A W7B
1/4W 63V C16
D9 104
W1B 47uF 35V 1/4W
27V
35V
1W
0.22R
AGND
R19
AGND
PHANTOM POWER SUPPLY

DGND

B +V_LCD B
U4

LM317L W6A
W6B
R12 T2B
T1A 1W
R21 FUSIBLE 1/4W
0.22 1/2W 1N4007 0.22R +5V D20
D22 270 CHGND
J5 R23 AGND
C34 T2A R20 1N4007
U33 47K 1/4W
R22 FUSIBLE 0.1uF
IN OUT +5VM
0.22 1/2W 250V 1N4007 7805
D23 C18
Q3 100uF

3.
C548 GND 1/4W
2Pin 3.96mm 4700uF 2N2907A
1N4007 C7 C558 R27 470 16V
D24 C22
4700uF
10V 104
6.3V 104
47K R28
C8

ORANGE
1/4W 100uF
1N4007
D25
16V

CSMA160V CSMA1120V CSMA1240V CSMA260V CMA2120V DGND

Digital POWER SUPPLY Digital

F2, F3
F4A/250V F6.3A/250V F8A/250V F4A/250V F6.3A/250V
F8, F9

F1 F5A/250V F6.3A/250V F8A/250V F6.3A/250V F8A/250V

A @230VAC A

R17 FUSIBLE
COMPANY:
0.22 1/2W 1N4007 D14
J4 +30V

F1 F6.3A/250V F8A/250V F10A/250V F8A/250V F10A/250V 1

1N4007 D15
TITLE:
2
C15 C23 R3 CSMA160V/260V/1120V/2120V/1240V PSU
@120VAC 2Pin 2.54mm
R18 FUSIBLE
0.22 1/2W
1N4007 D16
470u
104
47K
35V
1/4W
1N4007 D17 CODE: SIZE: DRAWING NO: REV:
W8A
W8B
FAN_GND
2015-11-13 011
GREEN CHGND
•••••••••••••••••

SCALE: SHEET: OF

46
Table of Contents
 VMA 1240 Service Manual
Version A - 03/19

6 5 4 3 2 1
REVISION RECORD

LTR ECO NO: APPROVED: DATE:

D D

TO PSU
W1

C C
SW1
C1
Power Switch 50V
0.0047uF 400VAC

W2

R1
4.7K

J3
TO PSU
D1
BLUE

B Power LED
B

COMPANY:

TITLE:

DRAWN: DATED:
VMA - 2-CH POWER SWITCH
<Drawn By> <Drawn Date>
A CHECKED: DATED:
A
CODE: SIZE: DRAWING NO: REV:
<Checked By> <Checked Date>

<Code> B 0201000987-619050 011

QUALITY CONTROL: DATED:
<QC By> <QC Date>
RELEASED: DATED:
<Released By> <Release Date> SCALE: <Scale> SHEET: 1 OF 1

47
Table of Contents
 VMA 1240 Service Manual
Bill of Materials - VMA 1240 Version A - 03/19

Refer to the corresponding Service Bill of Materials (SBOM) to order parts stocked by Harman.
Spare Parts List
Ref ID Description QTY
VMA 1X240W MIXER AMP 120V
1 PCB,ASY,VMA_2CH_PWR_SW 1
2 ENCL,PNL,SUB_FRNT,VMA 1
3 ENCL,LID,TOP,VMA,FIN 1
4 ENCL,CHAS,BOTTOM,VMA,FIN 1
5 HDW,BRKT,VMA,FIX HEADPHONE JACK 1
6 HDW,BRKT,VMA,FRONT ANGLE,FIN 2
7 HDW,BRKT,VMA,REAR PLAT,FIN 2
8 HDW,BRKT,VMA,REAR ANGLE,FIN 2
9 HDW,KNOB,VMA,FUNCTION KEY w/ARTWORK 1
10 HDW,KNOB,VMA,POWER BLACK 1
11 HDW,KNOB,VMA,BLUETOOTH BLACK 1
12 HDW,KNOB,VMA,VOLUME BLACK 1
13 HDW,KNOB,VMA,MIXER BLACK 5
14 OPT,LENS,VMA,PMMA w/ARTWORK 1
15 OPT,LIGHT RING,PMMA,TRANSPARENT 1
16 HDW,GSKT,BIG,SECC,BLACK 1
17 HDW,GSKT,SMALL,SECC,BLACK 2
18 FSTNR,SPCR,COPPER,4.75x20.8mm 4
19 HDW,FT,PAD,35x9mm 4
20 SHPMAT,CTN,544x504x172mm 1
21 SHPMAT,EPE,LEFT,480x160x100mm 1
22 SHPMAT,EPE,RIGHT,480x160x100mm 1
23 PCB,ASY,VMA_1CH _FRONT_PANEL 1
24 PCB,ASY,VMA_1CH _FRONT_INPUT 1
25 PCB,ASY,VMA_1CH _REAR_INPUT 1
26 PCB,ASY,VMA1240 _AMP 1
27 PCB,ASY,VMA1240_PSU 1
28 ENCL,PNL,FRNT,VMA1240,FIN 1
29 ENCL,PNL,REAR,VMA1240,FIN 1
30 CBL,PCRD,IEC,US,10A,18AWG,2m 1
31 CBL,FFC,28P,1.0MM,110MM 1
32 CBL,FFC,10P,1.0MM,280MM 1
33 CBL,WA,16AWG,100MM,GRN/YEL,UL1015 1
34 CBL,WA,16AWG,100MM,BRN,UL1672 1
35 CBL,WA,16AWG,100MM,BLU,UL1672 1
36 CON,HDR,1X16,2.5MM,ST 1
37 CON,HDR,M,PLUG,3P,5.0MM,GRN 1
38 CON,HDR,M,PLUG,5P,5.0MM,GRN 1
39 XFMR,PWR,TOROIDAL,120V,VMA1240 1
40 XFMR,SIG,TOROIDAL,240W,70V/100V 1
41 OPTO,DSPL.LCD,16X2,CHAR,NEG,WHT 1
42 MDL,ELEC,BLUETOOTH,AUDIO,MB8811C1B 1
43 CKT PROTN,FUSE,8A,250V,CERAMIC,5X20MM 2
44 CKT PROTN,FUSE,10A,250V,CERAMIC,5X20MM 1
45 THRMMGT,FAN,60X60X20MM,24V,4500RPM 1
45 CON,PWR,IEC,AC,INT,10A,250V,3P 1

Table of Contents
48