8 7 6 5 4 3 2 1

6.2V L1
27uH C6
47n
CB13.8V
R2
CB13.8V(EXT) RX8.5V 10K

C231 IC1 8.8V 13.8V

10n 1 20
P1 T/R C135
Q251 CHANNEL
2
3
P2
19
TX8.6V 10n C204 C205 C206 C136
2SC945 SWITCH P3 FIN 47n 100n 47n 47n
R207 4 P4
5 18 GND L7
4K7 P5 VCC C138 C35 C43
6 C8
CB13.8V(EXT) P6 39p 47n 10n T4 10n
S5-D1 7 TEST AO 17 R6
DIMMER 8 R13 4K7 10CP
COM+ CH19 C4 005M GND
9 CH9 AI 16 C5 1u R3 3K3 R21
10 10n C40 L3
MC R1 5K6 47n 220R
PD 15 R9
T1 R12 L6
220K T2 T3 PART OF REAR PANEL
14
560R R7 10DB 47K
10CB C139 IS ON PTSRO17AOX
LD 820R 003 10CA L8 C47 L9
003 BACK OF BOARD Q5 SO259
R15 006 R17 WHITE 120p GREEN
13 C36 SEE NOTE 1 6K8 2SC1846 C44 L10 L11 ANT
LED301 GND Q1 150K 5 1 2
C26 C121 CT1 10p 120p
2SC2724 Q3
D 12 82p 5p 20p C23 D
RO R8 33p 2SC2724 C37 C201
X1 150K
C21 C139 68p C39 L4 150p
RI 11
C3 R4 15p 39p Q4 120p YELLOW C49
22p D17 C124 10K C31 2SC2724 Q6 390p
LC7137A 10.240 MHz MA150 C24 R23
18p Q25 C19 330p 120p R20 2SC1909 C48 47K C50 D501
C123 2SC2724 18p 330R R119 220p 270p R501 1N60
C1 CT2 Q2 R10 R18 270R
47p 2SC945 C25 R16 C33 C42 RV5 100R
56p 20p C20 2K7 390R 4K7 R19 C41 R38
C7 D3 D13 120p C25 10n C38 10n 300R C45 C46 L5
22p C22 10n 68R 10n 390p 100R
Q20 47n ITT410 ITT410 10n 180p 100p
2SC710 G
Q21 C502
2SC710 R11 10n
R91
1K RV501
22K 10K
C51
R92 2p SWR PRESET
4K7
R93 C125 C126
2K2 2n2 2n2 PART OF FRONT PANEL CONTROLS

16
+
0
R201
13.8V(EXT)
R80
39K PCB = PTBM134AOX R24
D12
1N60

C52
RV4
10K
RF METER
4

S3 - 1K 1K C53
TP1 4n7 1u
DELTA TUNE

MIDLAND 76-900-UK
GND

VCO TEST POINT G

M3
S8-A
CAL / SWR RV201
1st Mixer 16.905 to 17.295 MHz SWITCH 10K
CAL PRESET
10.24MhZ
RV5 WHITE
LOW POWER Q5 S8-B
T4 RX SIGNAL CAL / SWR
TX L8 SWITCH
L9 RF POWER METER
L4
YELLOW
Q6 GREEN
Q17 Q16 8.8V
VR7
10K
Q4 12.5V SWR CAL
T7 T5
EM BASE COL FUNCTION
T3 Q7 RV2 RX8.5V G
D8 DEVIATION Q1 4.4 4.8 8.8 VCO
TX Q2 0 0 8.2 TX SW
RV4 Q3 TX 1.6 2.0 8.6 TX FREQ DOUBLER C77 R36 T12
27 MHZ 27 MHZ RF METER 1K T10 M2
Q4 TX 1.2 1.6 13.0 TX RF PRE-AMP R28 10n R31 07LA
T2 Q5 TX 0 0.3 12.2 TX RF DRIVER 100R 470R R34 07LA R42 R45 023N
004N R43 R40 47R
TX Q8 Q9 Q6 TX 0 0.1 12.2 TX RF OUTPUT 3K3 33K 15K
C IC5 C62 GND C67 680R C82 C

5
Q3 NJM4558D Q7 1.1 1.7 6.2 RF AMP T7 22p 2p C68 47u
Q2 RV6 Q8 1.2 1.7 12.0 1ST MIXER 5p T11
T8 C54 R26 10CM T9
1 ALC Q9 1.2 1.7 12.0 1ST MIXER 07LA 8
10.7 IF 27p 47K 003M T8 MA06
Q10 0 0.7 6.0 2ND MIXER T5 Q8 023N C84
Q11 1.1 1.6 11.4 455KhZ IF AMP ETR 2SC2724 47n
Q12 0.5 1.1 12.5 455KhZ IF AMP Q12
0333 2 14 SWR METER
T1 Q13 0.6 1.2 3.3 AUDIO AMP CF2 2SC828
VCO D5 Q7 Q10 Q11 IC3
D3 Q1 Q14 0 0 3.2 SQUELCH CONTROL CF1 455 KHz C80 9
MA150 2SC2724 2SC2724 2SC2724 AN240
Q19 Q15 0 0 0 ALC CONTROL 10.7 MHz 15p
R50 R49
Q16 12.5 9.1 8.6 8.6V REGULATOR Q9 C72 10 47K
Q17 TX 8.8 8.0 8.6 TX 8.6V SWITCH 2SC2724 R37 D6 D11 330R
10MA 1K 10n
Q18 0 0.7 0 ALC INHIBIT D4 C56 1N60 1N60 C87
RV1 MA150 018M
IC4 Q19 0 0.7 0.1 MODULATION MUTE 47p C70 1 22n
T9 R41
SQUELCH TA7205 Q20 LOW D TUNE SW 22n 12
10.7 IF 3K3 R44
D13 Q18 Q21 HIGH D TUNE SW C74 C86 C85
R29 R33 R38 330R 47n R47 1n 1n
Q25 *1 Q22 0 0.7 0 MIC AUDIO MUTE 2K7 C66 C73 R112 C76 C81
FB1 FB2 4K7 820R

3
4
6

7
Q10 Q25 0 0.7 5.5 VCO BUFFER R25 C58 C65 R30 10n 390R C69 R39 C71 47n 4K7 10n 47n R48
T10 680R R35 C75 C83
Q21 Q15 680R R27 10n 47n 10n 470R 47n 10n 100K
C55 C63 120R 22n
10n 680R 150p
Q22 Q14
Q20

Q13 C59 C134 G

455 IF 47n TP2
D2 3u3
RV3
S METER G 38
20 RX ALIGNMENT TEST POINT
IC1 T11 R46 M1
22K
LC7136 455 IF
OR LC7137 39 RV3
1 14 SIGNAL FOR SQUELCH CONTROL 20K
Q23 Q12 R202 VR6 S METER
IC3 T12 39K 100K 6B
AN240 RF GAIN
FM DISC
1 PART OF FRONT PANEL CONTROLS
Q11 RX AUDIO SIGNAL METER

MODULATION

*1 Q18 INCORRECTLY MARKED AS Q11 ON BOARD

C140 IS ON PART OF FRONT PANEL CONTROLS

BACK OF PCB
SW7-A PA 35
CB13.8V R122
CB/PA PA13.8V
RX AUDIO R14
5K6 C140 6K8 OFF ON OFF ON CB
33u
ALL CB/PA SWITCH
13.8V GND S1-A S1-B
ARE LINK AS ONE 20
ON/OFF ON/OFF 13.8V
R54
C101
68n
RX8.5V POWER POWER
R64
C99
2K2 220p 8.8V 13.8V(EXT) 47R
C102 D14 12.5V
B 47u MA150 CB13.8V(EXT) C110
B

1000u C60 C79

R55 R76 47n 10u
4 470K C118 R82 N/U N/U
4K7 5 33n 15 9
C92 1 2
18K CAUTION AC 11 12 14
560p C94 6
100u IC4 10 C105
MAINS 230 V
R73 R74 R75

4
C97 TA7205P C120 TO AC MAINS SIDE GND
PART OF FRONT PANEL CONTROLS 2n2 7 220u 27K 10K 10K
21 C96 8 22n
R52 R56
R58
2k2
10n 9
R72
10K 6 -
R78
10K
2 -
1
OF TRANSFORMER
PTPW005COX PSU
CB13.8V
3 CH1
2K7 C91 820K 7 3 + L
19 R53 10n C115 IC5A CHOKE
5
4K7 Q13 R59 C113 33n +
IC5B
R79
10K NJM4558D R86 8.8V

8
Q22 2SC1843 82R 47n 10R R88
2SC945 C103 NJM4558D
C213 C212 220p L14 1/2 W 390R
Q19
5n6 10n C88 C95
R83
2SC945 RX8.5V
4u7 * C100 C104 C119 R81 THERE ARE 2
R51 C93 33u 68n RV2 C116 R77 1n8 4K7 2K2 LOCATIONS FOR R81 C127 Q16 Q17
S6 R57 C114 3
VR5 VR1 5K6 R65 1n 2K 6n8 4n7 470K THE NORMALLY UNUSED 10n 2SC1318 2SA719
HI FILTER C89 C90
100K
TONE
50K
VOLUME
47n 4n7 10K C111
10n
560R DEV ONE IS NEAR THE 10.7M
CERAMIC FILTER. 13.8 VDC INPUT FROM
TX8.6V
PTPW005COX PSU G D9
R87 MA150 R5
270R 56R
R66 RV6
10K 500R
ALC
R89
3K3
6.2V
RX8.5V 1 L12 R100
G + Q24 10K
R69 R63 C122 R90 2SC945
R84 2K7 18K D201 220u 10K
NOTES: C11 C10
Q15 15K 1S1855 47u D2
C108 13.8 VDC D8 C9 6.2V 10n
1. ON SOME BOARDS, C139 IS SOLDERED 2SA564 Q18 3u3
R62
22K
C205 9.1V 47n TX8.6V
ACROSS R18 (I.E. BASE OF Q4) 2SC945 RV1 10n
Q14 20K C217 C218 2
THIS CAUSES LOW POWER AND T3 J3
R68 D7 R60 2SC945 4n7 4n7 -
NOT TO TUNE - MOVE IT TO T3. SQUELCH
1K 1N60 10K PART OF FRONT PANEL CONTROLS P.A.
PRESET C206
R67 C106
15K 33u C98 10n
2. MORE OUTPUT POWER: CHANGE Q5 TO 2SC2314. C112 C107 R70 R61
R85 D16 3u3 1K8 13 41 G TO PIN 14
10n 3u3 1K C109 PA
10K MA150 S7-C
10u 23
PART OF REAR PANEL
TO S1-A MAINS CB/PA CB
D19 L202
ON/OFF SWITCH MA150
1N60 47u
PA13.8V C207 C208 J4 GND = TRANSMIT
R95
4n7 4n7
EXT SP
PA13.8V
F1 270R
TX RX NORMAL -10dB PL1 PL2 PL3 PA MOD
2 AMP
C216
4u7
E = EXTERNAL SPEAKER CB13.8V(EXT) METER METER METER
I = INTERNAL SPEAKER VR3 VR4
Q23 J3
D1 TO D4 2SC945 E&I = EXTERNAL & INTERNAL 5K 5K
T201 PTPW005COX PSU MIC ALL DIMMER SWITCH
1N5403 MIC GAIN PA GAIN
TRANSFORMER C137 ARE LINK AS ONE S5-D3
C214 4 1
33u 4n7 I SP S2-A ATTN S2-B DIMMER
A 1 R96 I S5-D2
A
100R 3 2 S5-D4
Q201 E E&I E E&I SPEAKER DIMMER DIMMER
2SD313 3 C215 C210 C209 C211 R206
C3 G 4n7 4n7 4n7 10n CB PA
SPEAKER 27R
22n S4-A S4-B C208 R205 R204
R1 R2 R4 R5 SWITCH
220R 47R C6 820R 1K2 J6 4n7 S7-B 47R 27R
1/2 W 1/2 W Q1 22n 1/2 W 1/2 W PHONE PART OF FRONT PANEL CONTROLS
CB/PA
F2 2SC900 G
3 AMP PART OF FRONT PANEL CONTROLS ALL CB/PA SWITCH
VR2 ARE LINK AS ONE
10K
Q2 SQUELCH
RV1 R97
2SC900 500R 7 44 4 3 52 24 33 32 41
AC 230 VOLTS MAINS INPUT R3 4R7
2 100R R98
PART OF FRONT PANEL 330R
1/2 W 1W
C1 C4 1/2 W
2200u C2 C12 10n
ZD1
16v2 100u 22n
ZD2 R6
1.2 W RD 5v6 1K
13.8 VDC OUTPUT
TO PINS 3 AND G MIC AUDIO
G
BY: Rick Jackson Euro Radio Co

Size Document Number Rev

MIDLAND 76-900-UK.SCH 1.0

Date: Wednesday, April 04, 2007 Sheet 1 of 1

8 7 6 5 4 3 2 1