SERVICE MANUAL

AG-370
AM/FM Stereo Receiver

CONTENTS
1 SPECIFICATIONS ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・2
2 ADJUSTMENTS AND CHECKS ・・・・・・・・・・・・・・・・・・・・・・・・3
3 EXPLODED VIEWS AND PARTS LIST ・・・・・・・・・・・・・・・・・6
4 PC BOARDS AND PARTS LIST ・・・・・・・・・・・・・・・・・・・・・・・・8

NOTES

● PC boards shown are viewed from parts side.

● The parts with no reference number or no parts number in the
exploded views are not supplied.
● As regards the resistors and capacitors, refer to the circuit diagrams

contained in this manual.

● £ Parts marked with this sign are safety critical components. They

must be replaced with identical components - refer to the appropriate

parts list and ensure exact replacement.

Effective : April, 2003 S-0091A

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 1 SPECIFICATIONS
Amplifier Section
Output Power .... 50 + 50 watts RMS (0.9 % THD, 1 kHz, 8 ohms) Voltage Conversion
Total Harmonic Distortion.................... 0.05 % (at 45 watts,1 kHz) (General export models only)
Input Sensitivity/Impedance .................. PHONO: 4 mV/22 kohms
LINE: 270 mV/20 kohms
Frequency Response.................... PHONO: 20 Hz–20 kHz, +/–3 dB
LINE: 20 Hz–30 kHz, +1/–3 dB
Signal-to-Noise Ratio.............................................. PHONO: 60 dB
LINE: 68 dB
Tone Control .......................................... BASS: +/–9 dB at 100 Hz
TREBLE: +/–7 dB at 10 kHz
Loudness Control (Volume at –40 dB Position) ..............................
+7 dB at 100 Hz, +5 dB at 10 kHz

FM Tuner Section
(Without notes 98.1 MHz, 65 dBf)
Be sure to remove the power cord from the AC outlet before
Tuning Range .................... 87.5 MHz–108.0 MHz (100 kHz steps)
repositioning the voltage converter switch.
Usable Sensitivity (IHF) ............................................ Mono: 20 dBf
50 dB Quieting Sensitivity................ Mono: 39 dBf, Stereo: 46 dBf
1. Locate the voltage selector on the rear panel.
Capture Ratio ...................................................................... 2.8 dB
2. Using a flat-bladed screwdriver, set to the appropriate
Image Rejection Ratio .......................................................... 20 dB
230V or 120V position according to your area.
AM Suppresion Ratio............................................................ 48 dB
Harmonic Distortion (1 kHz) .............. Mono: 0.4 %, Stereo: 0.5 %
IN NORTH AMERICA USE ONLY ON 120 V SUPPLY.
Frequency Response................................ 30 Hz–15 kHz, +2/–3 dB
Stereo Separation (1 kHz) .................................................... 35 dB
Signal-to-Noise Ratio ........................ Mono: 57 dB, Stereo: 55 dB

AM Tuner Section
Tuning Range .......................... 520 kHz–1,720 kHz (10 kHz steps)
Usable Sensitivity ............................................................ 55 dB/m
Total Harmonic Distortion .................................... 1 % at 85 dB/m
Signal-to-Noise Ratio............................................................ 48 dB

General
Power Requirements.................................. 120 V/230 V, 50-60 Hz
Power Consumption ............................................................ 120 W
AC Outlet .......................... Unswitched x 1, 100 W max (1 A max)
Dimensions (W x H x D) ........................ 17-1/8" x 5-1/8" x 12-5/8"
(435 x 130 x 320 mm)
Weight (net) .................................................. 15-7/16 lbs (7.0 kg)
Standard Accessories .................................. AM Loop Antenna x 1
FM ”T” Type Antenna x 1

• Design and specifications are subject to change without notice.

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 2 ADJUSTMENTS AND CHECKS
2-1 AMPLIFIER SECTION
Bias Current Adjustment
1. Turn the unit on, and set the input selector switch to "CD".
2. Set 7VR1 and 7VR2 to the center position.
3. Connect the DC voltmeter as shown below after preheating for
10 minutes, and adjust 7VR1 (Lch) so that the voltage
becomes 3.3±1.3mV.
4. Adjust 7VR2 (Rch) in the same way.

0.33/5W 0.33/5W 0.33/5W 0.33/5W

7R46 7R44 7R45 7R43

DC voltmeter DC voltmeter

7VR2 7VR1

MAIN PCB

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 2-2 TUNER SECTION

SETTING ADJUSTMENT
ITEM ADJUST
INPUT OUTPUT AG-370 POINTS

FM 87.5 MHz 2L3 (3.5T) DC 1.0±0.05V

FM 108.0 MHz Check DC 8.0±0.5V

å
1. VT Adjust 2R19 (VT)
2J2 (GND) AM 530 kHz 2T2 (RED) DC 1.1±0.05V

AM 1720 kHz Check ≦ 8.0V

AM 600 kHz 2T1 (BLK) Max.

∫
2. AM Sensitivity
600 kHz/1500 kHz ç AM 1500 kHz 2TC2 Max.
50 dB/m REC OUT
400 Hz (30 % Mod)
After adjusting 2TC2, readjust 2T1 at 600 kHz.

∫
3. AM IF
1000 kHz ç AM 1000 kHz 2T3 (WHT) Max.
50 dB/m REC OUT
400 Hz (30 % Mod)

∂
4. FM Sensitivity
90 MHz ƒ FM 90 MHz 2L2 (4.5T) Max.
10~20 dBf REC OUT
1 kHz (100 % Mod)

∂
5. FM Distortion
98 MHz © FM 98 MHz 2T4 (PINK) Min. distortion
60 dBf REC OUT
1 kHz (100 % Mod)

∂é
6. FM Stereo
98 MHz © FM 98 MHz 2T5, 2T6 Min. distortion
60 dBf REC OUT
Stereo signal L-R

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 DC Voltmeter
A
2R19 TUNER PCB
2J2
2T1 2TC2 + −

2L2
2T2

2L3
2T5

2T3 2T4

2T6

AM Signal Generator
B

AM Loop
Antenna AC Voltmeter
C

60cm

FM Signal Generator AC Voltmeter

D F

Distortion Analyzer
G
E

Stereo Signal Generator

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 3 EXPLODED VIEWS AND PARTS LIST
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6
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 EXPLODED VIEW LIST
REF.NO. PARTS NO. DESCRIPTION REMARKS
1 9A06536200 MASTER VR KNOB 53W360900
2 9A06900300 INDICATOR 510104200
3 9A09581400 TONE CONTROL KNOB 530503000
4 9A09580800 DISPLAY LENS 510503600
5 9A09580700 PANEL 510503500

6 9A09580900 FUNCTION KEY 530502500

7 9A09581200 MEMORY KEY 530502600
8 9A09581000 BAND KEY 530502900
9 9A09592000 SILICON RUBBER,T0-3P2 322228370
10-1 £ 9A09590200 TR,2SD1047E 230104705

10-2 £ 9A09590300 TR,2SB817E 230817005

11 9A09581100 TUNING KEY 530502800
12 9A06536000 LOUD KNOB 53W360700
13 9A09581300 AUTO/MANUAL KEY 530502700
14 9A09592900 VFD DISPLAY 250370000

15 9A09579810 HEADPHONO PCB ASSY 033700601

16 9A09579910 SELECT PCB ASSY 033700401
17 9A07063400 SPEAKER SWITCH KNOB 53W361000
18 9A09580010 SELECT PCB ASSY 033700501
19 £ 9A06602800 POWER SWITCH 180222501

20 9A06535900 POWER KNOB 530049400

21 9A09579410 CONTROL PCB ASSY 033700201
22 9A06536400 LEG(GOLD) 540082601
23 9A06536300 LEG(BLACK) 540082600
24 9A09581600 BOTTOM COVER 520504800

25 9A06901000 SIDE BRACKET(L) 52W360300

26 9A09581800 SIDE BRACKET(R) 520505100
27 9A09581900 TOP COVER 520505000
28 9A09579310 MAIN PCB ASSY 033700101
29 9A09591800 HEAT SINK(A) 560502100

30 9A06901200 H/S BRACKET 540082800

31 9A09581700 REAR COVER 520504900
32 £ 9A09580100 POWER TRANSFORMER 157631522
33 9A06904300 GND TERMINAL,M3 320018601
34 £ 9A06900600 CORD BUSHING 550011700

35 £ 9A06602900 AC SOCKET 26CS18401

36 9A07064400 SPACER SUPPORT 550098819
37 9A09579510 TUNER PCB ASSY 033700301
38 9A09591700 CABLE CLIP 550505500
39 9A09591600 PCB SUPPORT 550505200

40 9A06900700 NAME PLATE 510104300

41 £ 9A09580200 AC POWER CORD 210183011
42 9A09579610 POWER SOCKET PCB ASSY 033700701
43 9A09579710 POWER SELECT SW PCB ASSY 033700801
44 £ 9A09587200 C,275V 0.01UF 136M103M2

INCLUDED ACCESSORIES
REF.NO. PARTS NO. DESCRIPTION REMARKS
9A09471700 OWNER'S MANUAL,EFSP 600520205
9A06902500 FM ANT 59W360100
9A06902600 AM ANT 59W360200

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 4 PC BOARDS AND PARTS LIST
MAIN PCB

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 FRONT PCB TUNER PCB

SP SEL PCB SP SEL PCB HEADPHONE PCB POW SEL PCB POWER PCB

−9−

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 MAIN PCB ASSY CONTROL PCB ASSY
REF.NO. PARTS NO. DESCRIPTION REF.NO. PARTS NO. DESCRIPTION
9A09579310 MAIN PCB ASSY 9A09579410 CONTROL PCB ASSY
9A09592100 MAIN PCB 9A09593800 FRONT PCB
9A06534100 SP JACK 9A09592900 VFD DISPLAY
9A06534200 RCA JACK,6P 9A09593900 VFD SHIELD CASE
9A06534300 RCA JACK,4P 6S1 9A09593000 SW,LOUDNESS

9A06896100 FUSE CLIP 6VR1-2 9A06534400 VR,100KBX2

9A06897300 LEAD PIN,3P 6VR3 9A06604000 VR,50KAX2
9A06901200 H/S BRACKET 6VR4 9A06534500 VR,100KW
9A09591600 PCB SUPPORT 8D1 9A09589500 DIODE,IN4148
9A09591700 CABLE CLIP 8D2 9A09592400 DIODE,ZENER 5V1 1/2W

9A09591800 HEAT SINK(A) 8D3-8 9A09589500 DIODE,IN4148

9A09591900 HEAT SINK(B) 8G1 9A09592800 OSC,CRYSTAL 4.433M
9A09592000 SILICON RUBBER,T0-3P2 8N1 9A09592500 IC,HT48R50A-1
1C1 £ 9A09586700 C,ELEC 35V 100UF M 8N2 9A09592600 IC,HT24LC02
1C4-5 £ 9A09586600 C,ELEC 25V 2200UF M 8N3 9A09592700 IC,PT6312LQ
SW1-20 9A09593100 SW,TACT
1C12 £ 9A09586500 C,ELEC 25V 100UF M
1C14-15 £ 9A09587000 C,ELEC 58V 6800UF M
1D1-8 £ 9A09589300 DIODE,IN4004
1D9-12 £ 9A09589400 DIODE,IN5404
1D13-14 9A09589500 DIODE,IN4148
TUNER PCB ASSY
1D15-18 £ 9A09589300 DIODE,IN4004
1D19 9A09589100 DIODE,ZENER 24V 1W REF.NO. PARTS NO. DESCRIPTION
1FU1-2 £ 9A09591200 FUSE,5A 250V SLOW BLOW 9A09579510 TUNER PCB ASSY
1N1 £ 9A09590800 IC,L7812CV 9A09625000 TUNER PCB
1N2 £ 9A09590900 IC,L7912CV 9A09625100 TUNER SHIELD CASE
2D1-2 9A09589500 DIODE,IN4148
1N3 £ 9A09590700 IC,L7805CV
2G1 9A09622100 FILTER,CERAMIC L10.7MS2 R
3D1-2 9A09588800 DIODE,ZENER 6V8 1/2W
3N1 9A09590400 IC,TC4052BP
2G2 9A09622200 FILTER,CERAMIC SFU450B
3N2 9A09590500 IC,TC4066BP
2G3 9A09622100 FILTER,CERAMIC L10.7MS2 R
3V1-3 9A09589600 TR,2SC1815GR
2G4 9A09622300 OSC,CRYSTAL 4.5MHZ
2L1 9A09622400 COIL,SPRING 3.5T M4.5
4N1 9A09590600 IC,4560D
2L2 9A09622500 COIL,SPRING 4.5T M3.5
5N1 9A09590600 IC,4560D
6N1 9A09590600 IC,4560D
2L3 9A09622600 COIL,SPRING 3.5T M3.5
7C28 £ 9A09587100 C,ELEC 63V 47UF M
2L4 9A09622700 INDUCTOR,AL0410 102
7D1-4 9A09589000 DIODE,ZENER 24V 1/2W
2L5 9A09622800 INDUCTOR,AL0410 221
7D5-6 9A09589500 DIODE,IN4148 2N1 9A09622900 IC,TA2149N
7D7 9A09589200 DIODE,ZENER 30V 1/2W 2N2 9A09623000 IC,TC9257F
7D8 9A09589500 DIODE,IN4148
7D9 9A09588900 DIODE,ZENER 12V 1/2W 2T1 9A09623800 IFT,AM RF10B(BLK)
7L1-2 9A09591000 COIL,SPRING 1.5UH 2T2 9A09623900 IFT,AM OSC 7B(RED)
2T3 9A09624000 IFT,AM IFT 7B(WHT)
7R43-46 £ 9A09585600 R,CEMENT 5W R33 J 2T4 9A09624100 IFT,FM DET 7B(PNK)
7R61-62 £ 9A09585400 R,2W 6R1 J 2T5-6 9A09624200 IFT,MPX 8B(BLK)
7R70 £ 9A09585300 R,0.5W 100 J
7R77-78 £ 9A09585500 R,2W 10 J 2TC2 9A09624300 SVC,CYM1-2/7
7V1-4 9A09589700 TR,2N5551 2V1 9A09624400 FET,2SK161GR
2V2 9A09624500 TR,2SC9018I
7V5-10 9A09589800 TR,2N5401 2V3 9A09624600 TR,2SC9014C
7V11-14 9A09589700 TR,2N5551 2V4-5 9A09589600 TR,2SC1815GR
7V15-16 9A09589900 TR,3DA4381
7V17-18 9A09590000 TR,3CA1667 2V6-7 9A09624600 TR,2SC9014C
7V19-20 £ 9A09590200 TR,2SD1047E 2V8 9A09624700 TR,2SC9018H
2VD1-2 9A09624800 DIODE,VARACTOR V1043
7V21-22 £ 9A09590300 TR,2SB817E 2VD3-4 9A09624900 DIODE,VARACTOR V149B
7V23-24 9A09589700 TR,2N5551 2X1 9A07129000 ANT JACK
7V25 9A09589800 TR,2N5401
7V26-29 9A09590100 TR,2SC8050D
7VR1-2 9A09585700 VR,SEMI-FIXED 300 J
REL1 9A09591100 RELAY,12V 5A
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 SELECT PCB ASSY
REF.NO. PARTS NO. DESCRIPTION
9A09579910 SELECT PCB ASSY
9A09626300 SP SEL PCB
2S1 9A09625800 SP SELECTOR SW

SELECT PCB ASSY

REF.NO. PARTS NO. DESCRIPTION
9A09580010 SELECT PCB ASSY
9A09626400 SP SEL PCB
2S2 9A09625800 SP SELECTOR SW

HEADPHONE PCB ASSY

REF.NO. PARTS NO. DESCRIPTION
9A09579810 HEADPHONE PCB ASSY
9A09625700 HEADPHONE PCB
9A06901600 H/P JACK HOLDER
7D11-12 9A09589500 DIODE,IN4148
7K1 9A06535000 HEAD PHONE JACK
7R75-76 £ 9A06889700 R,1/2W 330

POWER SELECT SW PCB ASSY

REF.NO. PARTS NO. DESCRIPTION
9A09579710 POWER SELECT SW PCB ASSY
9A09625400 POW SEL PCB
£ 9A07069700 POWER CHANGE SWITCH

POWER SOCKET PCB ASSY

REF.NO. PARTS NO. DESCRIPTION
9A09579610 POWER SOCKET PCB ASSY
9A09625300 POWER PCB
£ 9A06602900 AC SOCKET
9A06896100 FUSE CLIP
FU1 £ 9A09625200 FUSE,2.5A 250V SLOW BLOW

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 SCHEMATIC DIAGRAM AG-370 MAIN PCB (1/2)
1 2 3 4 5

1XS2 AND 1XP2

6C9 100U/16V TREBLE
4R17
4C19 -12V -12V 6VR2
100 6
100U/16V
6R13 5
6C7
6R23 1K 4 6N1-1 6R17
4
47 3 4558D 5K6
4R1 4R3 4R5 100 3
4 4C15 6C11
470 390 22K 3 4N1-1 4R13 2
4U7 6R7 1 4U7/50V 5
L 4558D 1K 6C15 1
4C9 1K 2
104
102 1
A 4C3
2
6R5 6C5 TREBLE
7 2
4C5

4R11 4R15
181

4C1 181 4C17 6C1 10K 820 6VR2-1 3

6R15
4R9 12K 180K 100K

6R16

6R21
471 220 4U7/50V 100KB 6C13

1K
6R1 10K

1K

1K
102
1 5
6R3 33K 6 6R9 15K

6R19
PHONO

5K6
4C7 4C11 4C13 1 5
4R7 BASS 6 6R11 1XP4
47U/16V 562 223

6VR3
50KB
270 6VR1-1 33K
L
100KB 1
4C20 +12 6C3 G

6VR4
100K
6S1
4R18 100 2

4U7/50V
100U/16V 153 R
3

6C12
+12
R G L
6C10 100U/16V
4R2 4R4 4R6
8 4N1-2 4C16

3
2
1

6R20
470 390 22K 4R14 6R24

5K6
5 4558D 4U7
R 1K 100 6R14
6C8
1K 8 1XS3
4C4 4C10 7 47 5 6C14

6R22
181 102 6 102

1K
6C6 7 6C16
4C6

4R12 4R16
181

4C2 820 6 104

4R10 12K 180K 100K 6N1-2 1XP3
471 4C18
4558D
220 1 4

3
2
1
6R6 6R8
TREBLE 6
10K 1K R G L
4C8 4C12 4C14 6VR2-2 6VR1
4R8 6
47U/16V 562 223 6C2 100KB 6R18
270 5
4U7/50V 5K6
6R2 10K 6R10 15K 4
3R1 3
2 4
3K9 6R4 33K 3 2
B 3R9 BASS
2
3
4
6R12
1
CD/L BASS
3C1 33K 6VR1-2 33K
1XS1 AND 1XP1
471 100KB
6C4
3C2 153
471
3R10
CD/R
3R2 3K9 33K
-12V
3R3 3K9
5C1 5C7
5R1 5R11
4U7/50V 100U/16V
3R11 1K 4 100
AUX/L 5
3C3 33K
-12V
471 3R15
7
100 5R13
3C4 6
5N1-1 1K
8

471 1XS6 5R3 5R5

3R12 4558D
AUX/R 47K 100K
3C11

3R4 3K9 33K

1
2
3
104
Y
VSS

VEE

Y1

Y3

Y2

Y0

3D1
5R9
6V8
TAPE

3R5 3K9 33K

SW1
SW2

100K
3R20

3N1
1

5C3
3R13 CD4052 5R7
TAPE/L 22U/16V
3C5 33K 15K
3D2
VDD

2C

3C
1I/O

1O/I

2O/I

2I/O

VSS

471
6V8 3V1
A1

A0

X3

X0

X1

X2
X

3C6 C1815 5C8

CD4066
3C12

471 +12 100U/16V +12

104

3R14
TAPE/R
9

10

11

12

13

14

15

16

3R6 3K9 33K

5C2
C 5R2
4U7/50V
5R12
VDD

3R16 100 1K 8 100

4I/O

4O/I

3O/I

3I/O

3
1C

4C
3N2

3R7 1K
1
3R17 10K 5R14
REC/L 3V2 3V3 2
9

8
14

13

12

11

10

3C7 5R4 5R6 5N1-2 1K

3C9 C1815 C1815
471 47K 100K 4558D
22

3C8 3C10
3R19
REC/R 471 22
3R18 10K 10K
5C4
3R8 5R8 5R10
22U/16V
1K 15K 33K
3R21 33K

3R22 33K
R
3
TO TUNER G
2
L
1

1XP10

AG-370
AM/FM Stereo Receiver
1 st Issue; January 2003

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 SCHEMATIC DIAGRAM AG-370 MAIN PCB (2/2), HEADPHONE PCB, SP SEL PCB, POWER PCB, POW SEL PCB
1 2 3 4 5

1XP5
1XS5 7K1

1
2
3
4
5
7C25 7D11 L 5
7R41 1
4U7/50V 4148 L 7R75 330 4
100 2
47U/63V

7D7 L L G R R G 2
3
30V 7D12 R 3
7C5

3K3/1W
7R5 7R7 7R25 7R29 7D5 4148 R 7
5
3K3 3K3 3K3 220 4148 7R76 330 8
7R67
1
2K7
7C29
REL1
103/50V 1XS8 1XP8
7V23
A

7R68
7V9 A/L- A/L-
7R57 5551 1 1

7R63
5401 7V19 B/L- B/L-

56K
18K 2 2

10U/50V
7V1 7V3 7D1 7V15 5200 G G
3 3

4K7
7C24
5551 5551 24V 669A 1D14 A/R- A/R-
4 4
3K3

27K

7V25 4148 B/R- B/R-

5 5
5401
7R59
7D8
22K
7C13

7R66
4148

33U/50V
220K
7R64
7C9 30P
1XS4 7R9 7R11 7C19
7R53

7R55

7C28
104
100 100 4U7/50V

SPB
DG
3
2
1

1
2
3
7R13 7C23 7R65
7R31 7R37
22K 102 220K
0.33/5W

R G L 3K3 220 1XP9

1
2
7R77
7R43

10/2W 7R72 2S1

7V28 1XP10 1XS9
7R51 7V13 10K SPA
8050D
1K 5551 7D10

1
2
3
1XS10
12V
7R33
7L1 7V26 7V27

1
2
7C17 1K5

B/L-

B/R-
1.5uH 8050D 8050D
47U/25V
7D3
24V

7R15 7R39

SPB
0.33/5W

G
7V29

DG
22K 7VR1 33
7R45

8050D
7R1 300
5.1/2W

1K 7R17 7R19 2S2

7R71

7R61

7R60

7C15
10K

22K

100 100 7R69 SPB

30P

7R70
7V17 10K

100
47K

649A
4148

7C1 7C26
7C21

4U7/50V 220U/16V

4004
7V11 7R73
104

7V5 7V7

DGND
5551 47K

100U/25V

SPB
SPA
2K2
1R4
7R74

5401 5401

4004
1D13

4004
1D15
7C27
B 7V21 1R5 22K
220U/16V
7C11 1XS7

3
2
1
7R49 1943
220

104 1D18 4004

1D17
1C12
1D16
33K
100P

7R21
3K3

7R3
3K3 7R23
100K
7R35

3K3 7C31 1C13 1X1

10P 10U/50V SPECKER
7C3

7R47
7R27

7C7
100
47U/63V 1D9 1D12

A/L+

A/L-

A/R-

A/R+

B/L+

B/L-

B/R-

B/R+
5404 5404
1FU1
5A/250V
7R42
100
100P

47U/63V

7D6 1XP15
FU1 C1
15K

4148 1D10 1D11

104

104
7C6

7R4 2.5A/250V 103/250V

6800U/50V

1R3 15K

7R6 7R8 7R26 7R30 5404 5404

100K
6800U/50V

3K3 3K3 3K3 220

1FU2
1C14

1C15
7C4

1C17

1C16

7R2 5A/250V
1R2

1K 7R58
7V10
18K
5401 1D1 1D3 S1
7V24 1R1
7V16 7V20 4004 4004 POWER SW
5551 100
7C2 7V2 7V4 669A 5200
4U7/50V 5551 5551 7D2 1XS11
1C1 100U/35V
3K3

27K

24V
24V
1
2
3
4
5
6

1C18

100U/35V

7C14
0V AC
-24V

2.5V
2.5V
DGND

7C10 30P 1D2 1D4 S2

100
+5V

7R10 7R12 7C20

7R54

7R56

104 4004 4004 VOLTAGE

1D19

100 100 4U7/50V

SEL.SW
C 1C2
1R6

7R14
7R32 7R38 104
22K
0.33/5W

3K3 220 1XP17

7R78
7R44

10/2W
7R52 7V14
1K 5551
7R34 1N3 1D5 1D6
7L2 78M05
7C18 1K5 4004 4004
1.5uH
47U/25V 7VR2
7D4
24V

7R16 7R40
0.33/5W

300
5.1/2W

22K 33
7R46

1XP16
470U/16V
7R62

1D7 1D8
7R18 7R20
2200U/25V

7C16 4004 4004

104

104

2200U/25V

100 100
30P
7V18 7V22
7C22
1C5

649A 1943
1C6

1C7

1C4

104
1C3

7V12 AC 120V/230V
7V6 7V8 5551
5401 5401 1N1 +12
7812
1XP12

AG-370
1000U/16V
104

7R50
220

1000U/16V

1
2

7C12 1XP13
33K
1C8

1C10

7R22 +5V
104
3K3

1
+12V
G
1C9

1C11

3K3 7R24 104 G -12V

2
7R36

3K3 7C30
7912
7C8 10P
7R48
7R28

47U/63V 1N2
100
AM/FM Stereo Receiver
1 st Issue; January 2003

Downloaded from www.Manualslib.com manuals search engine

 SCHEMATIC DIAGRAM AG-370 TUNER PCB
1 2 3 4 5

FM AM
75 LOOP

2X1

A 2C14
2R19
203
8K2
2VD3 2TC2 2C40
*2TC1 2R7 2R8 2T1 2R17
2D2 IN4148 V149B 2/7 3U3/50V
2/7 100K 100K 1K

2L2 4.5T 2R4

2V1 2C44
2VD1 100
K161GR 103
V104

1K
2C7
152

2C12
2C25 2C8
203
2C2 104 152 2V5

C1815GR
47U/16V

2R18
33 2N1 2C11 C1815GR
U1/50V

2C1 2R5
3.5T
2L1

2C29

2C39
TA2149N 103

2V4
30 3K3
2C28
1 24 203 2C42
RFGND FMRF 2R3 3K3 2G4
2T3 30 2N2
4.5M 2R23
2C3 2 23 TC9257F
RFIN RFVCC 2L3 3.5T 2R32 *24 2K4
30 2C5 2C4

2C13
3 22 152 *7 2C41 1 20
2VD2
V104

AMLCUT AMRF XT DO2

330

203
2C6 30
2R6 100K
4 21 152 2 19
MIXOUT FMOSC XTN DO1
2C9 2VD4 2R22 2K
2R2

5 20 2T2 3 18
VCC AMOSC 15 2C10 471 V149B PERIOD I/O-7
2C55
2R1 330 2R9 2R21 2K
47 6 19 4 17 2C24
AMIF OSCO 100K CLOCK I/O-8
102
2G1 L10.7M 7 18 2C15 5 16
2R30 330 FMIF ST DATA IFIN2 2C38
2G2 450B 203
B 8
GND IFREQ
17
*2R12 1K
2R14
2K
2R20
2K
6
OT-1 GND
15
100U/10V
2V2 9018I
2R31 330
9 16 7 14
L10.7M

2R29 300K AGC DETO 2R10 2C21 2R15 OT-2 FMIN

2G3

8K2 102 300K

10 15 8 13
QUOD DETIN OT-3 AMIN
2C54 2V8 2C43
22 9018H 11 14 9 12 203
ROUT LPF1 OT-4 VDD
2C30
100U/10V 2C31 12 13 2C19 10 11
LOUT LPF2 2C23 I/O-5 I/O-6
22U/16V 102
102
2C16 203 2C35 2L5
2R24 2C53 18 4U7/50V 221
2C22
100
3K3

102
2C18 682 2C36
1U/50V
2C17
2R11

2T2 682
2L4 2R13 2D1
102 3K3 IN4148
2C27
2R27 2R28 104
220U/10V

1K5 1K5 2C20

2C26
2C34

203
104
2C52
203

2V6 2V3
2V7 9014C 9014C
9014C 2R16
2C33 2C32
4U7/50V 4U7/50V 22K
100U/16V

C 2T5 2T4
2C47

2C46
203
PERIOD
CLOCK
DATA

2R25 2R26 2C45

100U/10V

+12V

ST

510 510 203

2C37

+5V

2C49 2C51
G

L
G
R

4
3
2
1

153 153
2
1

2C48 2C50 1XS10 1XS14

1
2

1
2
3

153 153 1XS12

1XS13

AG-370
AM/FM Stereo Receiver
1 st Issue; January 2003

Downloaded from www.Manualslib.com manuals search engine

 SCHEMATIC DIAGRAM AG-370 FRONT PCB
1 2 3 4 5

+5V

+5V
8C2 8C1 8D1 6
VFD 25114-1 104 470U/16 1N4148
DGND 5

8R21 1.8V AC
A 1 2 3 9 8 7 6 5 4 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 33 34 35
1.2
4
8R20 1.8V AC
3
1.2
8R2 0V AC
2
10K
-24V
+5V 8D2 8C3 1
5.1V 100U/16
-24V
+5V 8C4
8R15 10uF/25 KEY 4 KEY 3 KEY 2 KEY 1
56K
44 43 42 41 40 39 38 37 36 35 34
1 PHONO 4 TUNER 7
33
2 SKEY 6
32
3 8D3 1N4148
31
4 TAPE MO~ 3 CD 8
DOUT 30
5 SKEY 5
DIN 29
6 8N3 8D4 1N4148
28
7 PT6312 6 5 AUTO/~ MEMORY
CLK 27
8 SKEY 4
STB 26
9 8D5 1N4148
25
10 VIDEO/AUX 2 UP DOWN
24
11 SKEY 3
23
8D6 1N4148
1XP14 12 13 14 15 16 17 18 19 20 21 22 FM MODE AM
10K

10K

B DATA 1
PB5
8D7 1N4148
SKEY 2
8R16

8R17

1 FM1/2
PB4 SKEY 1
CLOCK 2
8D8
1N4148
PA3
PERIOD 3

PA2
ST LED 4

+5V +5V
PA3
8C10
PA4
104
PB7
8R14 8R4 8R3 8R18 8R19
PB6
1XP6 10K 10k 10k 10k 10k
1 PB5 PB6 28
PB3 2 PB4 PB7 27
SW1 1 PA6 SDA
3 PA3 PA4 26 5
PA7 SCL
4 PA2 PA5 25 6
PB2 5 PA1 PA6 24
SW2 2
6 PA0 PA7 23
7 PB3 OSC2/PG2 22 8C8
PB1 8 PB2 OSC1/PG1 21 30P 8N2
TAPE 3 8C9
9 PB1/BZ VDD 20 HT24LC02
8G1 4.00M 104
C 10
11
PB0/BZ
VSS
RES
PC5/TM1
19
18 8C7
12 PG0/INT PC4 17 30P
+5V
13 PC0/TM0 PC3 16
14 PC1 PC2 15
8R13
8N1
1XP7 HT48R50A-1 100K
8C6
1 104
GND 8C5 104
+5V
PC1 8R5
SPA 2
10K
SPB PC2 8R1
3
10K

NOTES:
INSTRUCTIONS FOR SERVICE PERSONNEL
BEFORE RETURNING APPLIANCE TO THE CUSTOMER, MAKE LEAKAGE-
CURRENT OR RESISTANCE MEASUREMENTS TO DETERMINE THAT EXPOSED
£Parts marked with this sign are safety critical components.
They must always be replaced with identical components-refer
to the appropriate parts list and ensure exact replacement.
AG-370
PARTS ARE ACCEPTABLY INSULATED FROM THE SUPPLY CIRCUIT.
AM/FM Stereo Receiver
1 st Issue; January 2003

Downloaded from www.Manualslib.com manuals search engine

 SCHEMATIC DIAGRAM AG-370 MAIN PCB (1/2)
1 2 3 4 5

1XS2 AND 1XP2

6C9 100U/16V TREBLE
4R17
4C19 -12V -12V 6VR2
100 6
100U/16V
6R13 5
6C7
6R23 1K 4 6N1-1 6R17
4
47 3 4558D 5K6
4R1 4R3 4R5 100 3
4 4C15 6C11
470 390 22K 3 4N1-1 4R13 2
4U7 6R7 1 4U7/50V 5
L 4558D 1K 6C15 1
4C9 1K 2
104
102 1
A 4C3
2
6R5 6C5 TREBLE
7 2
4C5

4R11 4R15
181

4C1 181 4C17 6C1 10K 820 6VR2-1 3

6R15
4R9 12K 180K 100K

6R16

6R21
471 220 4U7/50V 100KB 6C13

1K
6R1 10K

1K

1K
102
1 5
6R3 33K 6 6R9 15K

6R19
PHONO

5K6
4C7 4C11 4C13 1 5
4R7 BASS 6 6R11 1XP4
47U/16V 562 223

6VR3
50KB
270 6VR1-1 33K
L
100KB 1
4C20 +12 6C3 G

6VR4
100K
6S1
4R18 100 2

4U7/50V
100U/16V 153 R
3

6C12
+12
R G L
6C10 100U/16V
4R2 4R4 4R6
8 4N1-2 4C16

3
2
1

6R20
470 390 22K 4R14 6R24

5K6
5 4558D 4U7
R 1K 100 6R14
6C8
1K 8 1XS3
4C4 4C10 7 47 5 6C14

6R22
181 102 6 102

1K
6C6 7 6C16
4C6

4R12 4R16
181

4C2 820 6 104

4R10 12K 180K 100K 6N1-2 1XP3
471 4C18
4558D
220 1 4

3
2
1
6R6 6R8
TREBLE 6
10K 1K R G L
4C8 4C12 4C14 6VR2-2 6VR1
4R8 6
47U/16V 562 223 6C2 100KB 6R18
270 5
4U7/50V 5K6
6R2 10K 6R10 15K 4
3R1 3
2 4
3K9 6R4 33K 3 2
B 3R9 BASS
2
3
4
6R12
1
CD/L BASS
3C1 33K 6VR1-2 33K
1XS1 AND 1XP1
471 100KB
6C4
3C2 153
471
3R10
CD/R
3R2 3K9 33K
-12V
3R3 3K9
5C1 5C7
5R1 5R11
4U7/50V 100U/16V
3R11 1K 4 100
AUX/L 5
3C3 33K
-12V
471 3R15
7
100 5R13
3C4 6
5N1-1 1K
8

471 1XS6 5R3 5R5

3R12 4558D
AUX/R 47K 100K
3C11

3R4 3K9 33K

1
2
3
104
Y
VSS

VEE

Y1

Y3

Y2

Y0

3D1
5R9
6V8
TAPE

3R5 3K9 33K

SW1
SW2

100K
3R20

3N1
1

5C3
3R13 CD4052 5R7
TAPE/L 22U/16V
3C5 33K 15K
3D2
VDD

2C

3C
1I/O

1O/I

2O/I

2I/O

VSS

471
6V8 3V1
A1

A0

X3

X0

X1

X2
X

3C6 C1815 5C8

CD4066
3C12

471 +12 100U/16V +12

104

3R14
TAPE/R
9

10

11

12

13

14

15

16

3R6 3K9 33K

5C2
C 5R2
4U7/50V
5R12
VDD

3R16 100 1K 8 100

4I/O

4O/I

3O/I

3I/O

3
1C

4C
3N2

3R7 1K
1
3R17 10K 5R14
REC/L 3V2 3V3 2
9

8
14

13

12

11

10

3C7 5R4 5R6 5N1-2 1K

3C9 C1815 C1815
471 47K 100K 4558D
22

3C8 3C10
3R19
REC/R 471 22
3R18 10K 10K
5C4
3R8 5R8 5R10
22U/16V
1K 15K 33K
3R21 33K

3R22 33K
R
3
TO TUNER G
2
L
1

1XP10

AG-370
AM/FM Stereo Receiver
1 st Issue; January 2003

Downloaded from www.Manualslib.com manuals search engine

 SCHEMATIC DIAGRAM AG-370 MAIN PCB (2/2), HEADPHONE PCB, SP SEL PCB, POWER PCB, POW SEL PCB
1 2 3 4 5

1XP5
1XS5 7K1

1
2
3
4
5
7C25 7D11 L 5
7R41 1
4U7/50V 4148 L 7R75 330 4
100 2
47U/63V

7D7 L L G R R G 2
3
30V 7D12 R 3
7C5

3K3/1W
7R5 7R7 7R25 7R29 7D5 4148 R 7
5
3K3 3K3 3K3 220 4148 7R76 330 8
7R67
1
2K7
7C29
REL1
103/50V 1XS8 1XP8
7V23
A

7R68
7V9 A/L- A/L-
7R57 5551 1 1

7R63
5401 7V19 B/L- B/L-

56K
18K 2 2

10U/50V
7V1 7V3 7D1 7V15 5200 G G
3 3

4K7
7C24
5551 5551 24V 669A 1D14 A/R- A/R-
4 4
3K3

27K

7V25 4148 B/R- B/R-

5 5
5401
7R59
7D8
22K
7C13

7R66
4148

33U/50V
220K
7R64
7C9 30P
1XS4 7R9 7R11 7C19
7R53

7R55

7C28
104
100 100 4U7/50V

SPB
DG
3
2
1

1
2
3
7R13 7C23 7R65
7R31 7R37
22K 102 220K
0.33/5W

R G L 3K3 220 1XP9

1
2
7R77
7R43

10/2W 7R72 2S1

7V28 1XP10 1XS9
7R51 7V13 10K SPA
8050D
1K 5551 7D10

1
2
3
1XS10
12V
7R33
7L1 7V26 7V27

1
2
7C17 1K5

B/L-

B/R-
1.5uH 8050D 8050D
47U/25V
7D3
24V

7R15 7R39

SPB
0.33/5W

G
7V29

DG
22K 7VR1 33
7R45

8050D
7R1 300
5.1/2W

1K 7R17 7R19 2S2

7R71

7R61

7R60

7C15
10K

22K

100 100 7R69 SPB

30P

7R70
7V17 10K

100
47K

649A
4148

7C1 7C26
7C21

4U7/50V 220U/16V

4004
7V11 7R73
104

7V5 7V7

DGND
5551 47K

100U/25V

SPB
SPA
2K2
1R4
7R74

5401 5401

4004
1D13

4004
1D15
7C27
B 7V21 1R5 22K
220U/16V
7C11 1XS7

3
2
1
7R49 1943
220

104 1D18 4004

1D17
1C12
1D16
33K
100P

7R21
3K3

7R3
3K3 7R23
100K
7R35

3K3 7C31 1C13 1X1

10P 10U/50V SPECKER
7C3

7R47
7R27

7C7
100
47U/63V 1D9 1D12

A/L+

A/L-

A/R-

A/R+

B/L+

B/L-

B/R-

B/R+
5404 5404
1FU1
5A/250V
7R42
100
100P

47U/63V

7D6 1XP15
FU1 C1
15K

4148 1D10 1D11

104

104
7C6

7R4 2.5A/250V 103/250V

6800U/50V

1R3 15K

7R6 7R8 7R26 7R30 5404 5404

100K
6800U/50V

3K3 3K3 3K3 220

1FU2
1C14

1C15
7C4

1C17

1C16

7R2 5A/250V
1R2

1K 7R58
7V10
18K
5401 1D1 1D3 S1
7V24 1R1
7V16 7V20 4004 4004 POWER SW
5551 100
7C2 7V2 7V4 669A 5200
4U7/50V 5551 5551 7D2 1XS11
1C1 100U/35V
3K3

27K

24V
24V
1
2
3
4
5
6

1C18

100U/35V

7C14
0V AC
-24V

2.5V
2.5V
DGND

7C10 30P 1D2 1D4 S2

100
+5V

7R10 7R12 7C20

7R54

7R56

104 4004 4004 VOLTAGE

1D19

100 100 4U7/50V

SEL.SW
C 1C2
1R6

7R14
7R32 7R38 104
22K
0.33/5W

3K3 220 1XP17

7R78
7R44

10/2W
7R52 7V14
1K 5551
7R34 1N3 1D5 1D6
7L2 78M05
7C18 1K5 4004 4004
1.5uH
47U/25V 7VR2
7D4
24V

7R16 7R40
0.33/5W

300
5.1/2W

22K 33
7R46

1XP16
470U/16V
7R62

1D7 1D8
7R18 7R20
2200U/25V

7C16 4004 4004

104

104

2200U/25V

100 100
30P
7V18 7V22
7C22
1C5

649A 1943
1C6

1C7

1C4

104
1C3

7V12 AC 120V/230V
7V6 7V8 5551
5401 5401 1N1 +12
7812
1XP12

AG-370
1000U/16V
104

7R50
220

1000U/16V

1
2

7C12 1XP13
33K
1C8

1C10

7R22 +5V
104
3K3

1
+12V
G
1C9

1C11

3K3 7R24 104 G -12V

2
7R36

3K3 7C30
7912
7C8 10P
7R48
7R28

47U/63V 1N2
100
AM/FM Stereo Receiver
1 st Issue; January 2003

Downloaded from www.Manualslib.com manuals search engine

 SCHEMATIC DIAGRAM AG-370 TUNER PCB
1 2 3 4 5

FM AM
75 LOOP

2X1

A 2C14
2R19
203
8K2
2VD3 2TC2 2C40
*2TC1 2R7 2R8 2T1 2R17
2D2 IN4148 V149B 2/7 3U3/50V
2/7 100K 100K 1K

2L2 4.5T 2R4

2V1 2C44
2VD1 100
K161GR 103
V104

1K
2C7
152

2C12
2C25 2C8
203
2C2 104 152 2V5

C1815GR
47U/16V

2R18
33 2N1 2C11 C1815GR
U1/50V

2C1 2R5
3.5T
2L1

2C29

2C39
TA2149N 103

2V4
30 3K3
2C28
1 24 203 2C42
RFGND FMRF 2R3 3K3 2G4
2T3 30 2N2
4.5M 2R23
2C3 2 23 TC9257F
RFIN RFVCC 2L3 3.5T 2R32 *24 2K4
30 2C5 2C4

2C13
3 22 152 *7 2C41 1 20
2VD2
V104

AMLCUT AMRF XT DO2

330

203
2C6 30
2R6 100K
4 21 152 2 19
MIXOUT FMOSC XTN DO1
2C9 2VD4 2R22 2K
2R2

5 20 2T2 3 18
VCC AMOSC 15 2C10 471 V149B PERIOD I/O-7
2C55
2R1 330 2R9 2R21 2K
47 6 19 4 17 2C24
AMIF OSCO 100K CLOCK I/O-8
102
2G1 L10.7M 7 18 2C15 5 16
2R30 330 FMIF ST DATA IFIN2 2C38
2G2 450B 203
B 8
GND IFREQ
17
*2R12 1K
2R14
2K
2R20
2K
6
OT-1 GND
15
100U/10V
2V2 9018I
2R31 330
9 16 7 14
L10.7M

2R29 300K AGC DETO 2R10 2C21 2R15 OT-2 FMIN

2G3

8K2 102 300K

10 15 8 13
QUOD DETIN OT-3 AMIN
2C54 2V8 2C43
22 9018H 11 14 9 12 203
ROUT LPF1 OT-4 VDD
2C30
100U/10V 2C31 12 13 2C19 10 11
LOUT LPF2 2C23 I/O-5 I/O-6
22U/16V 102
102
2C16 203 2C35 2L5
2R24 2C53 18 4U7/50V 221
2C22
100
3K3

102
2C18 682 2C36
1U/50V
2C17
2R11

2T2 682
2L4 2R13 2D1
102 3K3 IN4148
2C27
2R27 2R28 104
220U/10V

1K5 1K5 2C20

2C26
2C34

203
104
2C52
203

2V6 2V3
2V7 9014C 9014C
9014C 2R16
2C33 2C32
4U7/50V 4U7/50V 22K
100U/16V

C 2T5 2T4
2C47

2C46
203
PERIOD
CLOCK
DATA

2R25 2R26 2C45

100U/10V

+12V

ST

510 510 203

2C37

+5V

2C49 2C51
G

L
G
R

4
3
2
1

153 153
2
1

2C48 2C50 1XS10 1XS14

1
2

1
2
3

153 153 1XS12

1XS13

AG-370
AM/FM Stereo Receiver
1 st Issue; January 2003

Downloaded from www.Manualslib.com manuals search engine

 SCHEMATIC DIAGRAM AG-370 FRONT PCB
1 2 3 4 5

+5V

+5V
8C2 8C1 8D1 6
VFD 25114-1 104 470U/16 1N4148
DGND 5

8R21 1.8V AC
A 1 2 3 9 8 7 6 5 4 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 33 34 35
1.2
4
8R20 1.8V AC
3
1.2
8R2 0V AC
2
10K
-24V
+5V 8D2 8C3 1
5.1V 100U/16
-24V
+5V 8C4
8R15 10uF/25 KEY 4 KEY 3 KEY 2 KEY 1
56K
44 43 42 41 40 39 38 37 36 35 34
1 PHONO 4 TUNER 7
33
2 SKEY 6
32
3 8D3 1N4148
31
4 TAPE MO~ 3 CD 8
DOUT 30
5 SKEY 5
DIN 29
6 8N3 8D4 1N4148
28
7 PT6312 6 5 AUTO/~ MEMORY
CLK 27
8 SKEY 4
STB 26
9 8D5 1N4148
25
10 VIDEO/AUX 2 UP DOWN
24
11 SKEY 3
23
8D6 1N4148
1XP14 12 13 14 15 16 17 18 19 20 21 22 FM MODE AM
10K

10K

B DATA 1
PB5
8D7 1N4148
SKEY 2
8R16

8R17

1 FM1/2
PB4 SKEY 1
CLOCK 2
8D8
1N4148
PA3
PERIOD 3

PA2
ST LED 4

+5V +5V
PA3
8C10
PA4
104
PB7
8R14 8R4 8R3 8R18 8R19
PB6
1XP6 10K 10k 10k 10k 10k
1 PB5 PB6 28
PB3 2 PB4 PB7 27
SW1 1 PA6 SDA
3 PA3 PA4 26 5
PA7 SCL
4 PA2 PA5 25 6
PB2 5 PA1 PA6 24
SW2 2
6 PA0 PA7 23
7 PB3 OSC2/PG2 22 8C8
PB1 8 PB2 OSC1/PG1 21 30P 8N2
TAPE 3 8C9
9 PB1/BZ VDD 20 HT24LC02
8G1 4.00M 104
C 10
11
PB0/BZ
VSS
RES
PC5/TM1
19
18 8C7
12 PG0/INT PC4 17 30P
+5V
13 PC0/TM0 PC3 16
14 PC1 PC2 15
8R13
8N1
1XP7 HT48R50A-1 100K
8C6
1 104
GND 8C5 104
+5V
PC1 8R5
SPA 2
10K
SPB PC2 8R1
3
10K

NOTES:
INSTRUCTIONS FOR SERVICE PERSONNEL
BEFORE RETURNING APPLIANCE TO THE CUSTOMER, MAKE LEAKAGE-
CURRENT OR RESISTANCE MEASUREMENTS TO DETERMINE THAT EXPOSED
£Parts marked with this sign are safety critical components.
They must always be replaced with identical components-refer
to the appropriate parts list and ensure exact replacement.
AG-370
PARTS ARE ACCEPTABLY INSULATED FROM THE SUPPLY CIRCUIT.
AM/FM Stereo Receiver
1 st Issue; January 2003

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