Front Unit - Icom IC-7400 Service Manual

12-2 FRONT UNIT

RUP J502 RUP RUP
5VL 5VL
S-LOGIC BOARD
RDN RDN RDN
GND GND
GND GND
GND GND CP523 CP521
GND GND CP522
GND GND
GND GND CP504 CP502 NR/NOTCH
Back Light
GND GND CP505 CP503 CP501
MAX: 4.9V
R2 MIN: 0.16V
1k
5VL J501 5VL PB3
[NOTCH]
PB1A PB1A
PB1B PB1B
MCHA MCHA PB2
[NR]
P14
MCHB MCHB
R3
PB2A PB2A
1k
PB2B PB2B
GND GND [AF/RF]
GND GND
R5 R306
GND GND
CP572 CP574 1k NTCCM20123JH472KCT
PB1
CP571 CP573 CP576 IC571 [RF]
PAFE J507 PAFE TC4S71F
PAFO PAFO 5
D573 1
PAFE PAFE 4 PB0
DA221 2 [AF]
R571
GND GND
22k R6
PHNL PHNL 3
1k
DASH DASH DASH
DOT DOT DOT
GND GND -8V
GND GND 8V
GND GND 5V
MIC J508 MIC
CP701 CP703
M8V M8V
CP702
L401 C401
MUD MUD
D10F-A814AY-681K 0.1 [MIC
SQLS SQLS
CP704
MSEND MSEND GAIN]
CP706 C402
GND GND
CP705 470
MMICE MMICE
CP707
PAFO PAFO
CP708 R403
8.2k
[RF
CP714
J601 SPS PWR]
CP710 CP713 CP715
C403
PAFO
CP711 0.1
PAFE
CP712
LFMD
C404
LMFD
220
GND
[CW
SRES IC401
C405
PWRK NJM2360M PITCH]
CP716 270p
L402
SQL
CP717 D10F-A814AY-221K
SEND
CP718
to MICE
MAIN CP719
MIC D402
unit CP720
GND SB10-05PCP C407
J1334 CP721
0.1 [KEY
-8V_
GND SPEED]
L601
GND L403
SLF7032T-101MR45-2
D10F-A814AY-681K
5VL
-7.6V
5VL
GND
R16
8V
GND selection Voltage(V) R15 S8
SKQDPA
6.8k
14V P.AMP/ATT 0.00
S601 SKQDPA NB 1.24
[POWER] C9
VOX 2.50
CP722 CP723 CP724 0.1
MONI 3.77 [P.AMP/
OFF 4.90 ATT]
4.8V 7.8V 13.6V
CP8 CP7 CP6 CP5
J2
MIC MIC L1 100µ
[PBT] M8V M8V
MUD MUD L3 100µ
S2
TP90D96E20-30F-2178-1 SQLS SQLS L4 100µ
PB2A 2 MSEND MSEND
CP5 CP4 CP3 CP2 CP1
A
J1 PB2B 3 GND GND
B PBT2
5VL 5VL GND 1 MMICE MMICE L6 100µ
COM
PB1A PB1A
PB1A 5 PAFO PAFO
A
PB1B PB1B PB1B 6 NC
B PBT1
MCHA MCHA GND 4 NC
COM CP1 CP2 CP3 CP4
MCHB MCHB
PB2A PB2A
PB2B PB2B
[M-CH]
GND GND
GND GND
S1
TP90N00E20-22.5-2494
GND GND MIC BOARD
MCHA 2
A
MCHB 3
B
GND 1
COM
PBT BOARD
CP5 CP4 CP3 CP2 CP1 L1
J3
HF50ACC322513-B
PAFE PAFE
PAFO PAFO
R1 180
PAFE PAFE
S1
CP3 CP2 CP1
J1 EVQ-VCJF0324B GND GND
R2 180
RUP RUP 4 PHNL PHNL
COM
5VL 5VL 3 DASH DASH
NC L2
RDN RDN 2 DOT DOT
B HF50ACC322513-B
GND GND 1 GND GND
A
GND GND GND GND
GND GND GND GND
[RIT/ TX]
GND GND
GND GND
GND GND
GND GND
RIT BOARD PHONE BOARD
FRONT UNIT
12 - 2
CP304
CP303 CP305 DISPLAY BOARD
13.8V
J301 J1001
5VL W19 5VL
P41 5VL 5VL
MEASUREMENT CONDITIONS P42 GND GND
frequency: 14.1MHz USB
P14 P14 BKL BKL
RX no input CP306
Oscilloscope(20MHz,1MΩ) P15 P15 RSA RSA
CP307
Digital tester P16 MSA
P16 MSA
Range Input resister CP308
P17 P17 RSB RSB
200mV 100MΩ CP309
P41 LMFD LMFD
2V 11MΩ
3.03V Voltage at RX(No designation)
Q302 20V 10MΩ P42 LFMD LFMD
2SB1201 P21 P21 MSB MSB
CP310
L303 GND GND CP1022 CP1021 CP1020
L302
5.85V 100µ D818HN-1107 PB1A PB1A PB1A
R301 Q301 CFL+ CP311
PB1B PB1B PB1B
6.8k 2SC4081
CFL- CP312
MDNK MDNK MDNK
D301 CP313
C305 MUPK MUPK MUPK
2.49V RD3.0M CP314
12p
SRES SRES SRES
CP315
-8V -8V
P67 P67 LOCK LOCK
0.15V
CP317
P66 P66 SPEK SPEK
0.15V CP318
-8V -8V -8V
CP316
0.67V 8V 8V
Q303 Q304 CP325
0.67V GND GND
2SC3647 2SC3647 CP328
CP1026 CP1031 CP1032 CP1025
J1002
J302
W20
PB0 AFL AFL PB0
PB1 RFL RFL PB1
PB0 PB2 NRL NRL PB2
R104 1M CP329
R102 R103 PB1 PB3 APFL APFL PB3
220k 100k CP330
R8
8 PB2 PB4 MIGL MIGL PB4
1k 10 P15 CP331
PB4 9 PB3 PB5 PWRL PWRL PB5
CP332
PB4 PB6 RITL RITL PB6
IC101c CP333
PB5 PB7 KYSL KYSL PB7
CP334
PB6 PC2 MUD MUD
R108 1M CP335
R106 R107
PB7 DASH DSHK DSHK
220k 100k CP336
12 DOT DOTK DOTK
11 P17
R10 13 DASH P54 APFK APFK
1k CP338
PB5 DOT P53 NRK NRK
IC101d CP339
P54 P52 ANTK ANTK
CP340
8 P53 P51 TUNK TUNK
10 CP341
9 P52 P50 TRAK TRAK
CP342
P51 KIO KIOI
14 KIOI
R111 IC102c CP343
µPD4030BG 1 P50 PB2A PB2A
15k 3 P16 CP344
R12 2 KIO PB2B PB2B
IC102b
1k R112 µPD4030BG CP345
PB6 14 PC2 GND GND
1 47k 7 CP337 CP348
3 5 PB2A GND GND CP1042
2 4 P21 CP346
6 PB2B GND GND CP1043
CP347
7 IC101a CP302 CP1044
IC102a MC14071BFEL CP301 CP1045
IC102d
µPD4030BG
µPD4030BG J303 CP1046
R14 5 S6 S7
4 12 CFL+ CP2001
1k 6 11 SKQDPA SKQDPA
PB7 13
CFL
IC101b R113
CFL-
15k
[CALL] [LOCK/SPCH]
CP603
CP604 DS1002
J604
2.2k R17 4.7k R18 15k C1205 0.0047
5VL
S9 S10 S11 S1 S2 S3 S4 S5 MUP
SKQDPA SKQDPA SKQDPA SKQDPA SKQDPA SKQDPA SKQDPA SKQDPA to
MDN MAIN
DIAL
CP605
[NB] [VOX/ [TRANSMIT] [TUNER] [ANT] [NR] [A/NOTCH]
BK-IN]
[MONITOR]
R15 R3 R2
6.8k 6.8k 6.8k
C1
0.0047
C4 C3 C2
J1
0.1 0.1 0.1
MNUK MNUK
J1
FM214-BSS(P) F1K F1K
F2K F2K
F3K F3K
F2 F1
1 7 F4K F4K
7
F-INP 3.5
F5K F5K
2 8 6
SSBK SSBK
3 5 CWRK CWRK
4
AFMK AFMK
SPLIT 18 14
FILK FILK
GND GND
F3 F4
GND GND
GND GND
A/B 28 24
GND GND
GND GND
GND GND
GND GND
TS 144
GND GND 50
F5 MENU
GND GND
J1
GND GND
HLJ5305-01-4090 D54
GND GND CL-220YG
GND GND FIND
DS5
CL-220YG
R23 R24
CW/ SPLD MPRK
SSB MP-R 6.8k 2.2k
RTTY
[PHONES] DS3
CL-220HR
LOCD
MPWK
DS2 MP-W
J2
CL-220YG RIT TX
HLJ7000-01-3010
RXD
AM/
FILTER DS1
FM XFCK
CL-220HR
XFC
TXD
MODE BOARD
[ELEC-KEY]
W22
C1007 0.1
IC1003
0.1µsec C1008
CP1050 CP1051 TC7W74F
0.1
IC1004a
8 6
TC7W32F
R1123 1k 3.7V
8
R1122 1k 1 5 1
CK Q 7 FAI1
2
R1052
R1101 1k 2 3
D Q 4 1k
R1102 1k
R1103 1k
7 4
R1104 1k
IC1004b
R1105 1k
TC7W32F
R1106 1k 5
3 FAI2
R1107 1k 6
R1051
CP1027 1k
R1118 2.2k C1005 0.1
R1119 1k CNT1
R1120 1k CNT2
R1121 1k D1005 MA2S111
D1002 R1057 100k
CP1017 MA2S111
CP1018
IC1002
BU4051BCF
16
KI0 13 3 1 75
X0 X PC3/AN11 P97/SEG40/CL1
KI1 14 2 74
X1 AVSS P96/SEG39/CL2
KI2 15 C1001 3 73
X2 C1002 0.1 TEST P95/SEG38/DO
KI3 12 4 72
X3 12p X2 P94/SEG37/M
KI4 1 5 71
X4 X1 P93/SEG36
KI5 5 6 70
X5 VSS P92/SEG35
KI6 2 7 69 FRM
X6 OSC1 P91/SEG34
KI7 4 8 68
X7 OSC2 P90/SEG33
9 67 LD7
C1003 RES P87/SEG32
6 12p 10 66 LD6
INH MD0 P86/SEG31
11 11 65 LD5
A P20/IRQ4/ADTRG P85/SEG30
10 12 64 LD4
B P21/UD P84/SEG29
9 13 63 LD3
IC1001
C P22 P83/SEG28
0.1µsec FIND 14 HD6433833SD85H 62 LD2
P23 P82/SEG27
7 8 SPLD 15 61 LD1
P24 P81/SEG26
LOCD 16 60 LD0
R1131 P25 P80/SEG25
TXD 17 59 LE2
1k P26 P77/SEG24
SRES RXD 18 58 LE1
P27 P76/SEG23
19 57 LE0
P30/SCK1 P75/SEG22
20 56 LA0
P31/SI1 P74/SEG21
21 55 LRES
P32/SO1 P73/SEG20
22 54
P33/SCK2 P72/SEG19
23
CP1024 CP1023 53
R1133 P34/SI2 P71/SEG18
24 52
1k P35/SO2 P70/SEG17
MDNK 25 51
P36/STRB P67/SEG16
R1134
C1201 0.0047
1k
MUPK C1202 0.0047
C1203 0.0047
C1204 0.0047
C1208 0.0047
C1207 0.0047
-7.6V D1004 D1003 C1206 0.0047
DA221 DA221
7.8V
-8V
+8V
KI0
CP531 CP532 CP533 CP534 CP535 CP536
J1 J503
LDV W21 LDV LDV
5VL 5VL
KI2 KI2 R531 1k KI2
KI3 KI3 R532 1k KI3
R1
KI4 KI4 R533 1k KI4
6.8k
KI5 KI5 R534 1k KI5
KI6 KI6 R535 1k KI6
C1
KI7 KI7 R536 1k KI7
0.1
XFCK XFCK R537 1k XFCK
MPWK MPWK R538 1k MPWK
MPRK MPRK R539 1k MPRK
TXD TXD R540 2.2k TXD
RXD RXD R541 680 RXD
1.8 LOCK R542 2.2k LOCD
LOCD
SPLD SPLD R543 680 SPLD
FIND FIND R544 680 FIND
GND GND
10
GND GND
CP538 CP540 CP542 CP544 CP546
GND GND
CP537 CP539 CP541 CP543 CP545
GND GND
GND GND
21 CP547
GND GND
R19 CP552 CP554
6.8k CP551 CP553 CP555
KI6 J505
MNUK MNUK R555 1k MNUK
GENE
C5 F1K F1K R556 1k F1K
0.1
F2K F2K R557 1k F2K
F3K F3K R558 1k F3K
F4K F4K R559 1k F4K
F5K F5K R560 1k F5K
V/M CALL
SSBK SSBK
CWRK CWRK
R25
AFMK AFMK
4.7k
FILK FILK
R20 R554 R553 R552 R551
GND GND
2.2k 15k 4.7k 2.2k 6.8k
GND GND LDV
CP556 CP558 CP560 KI1
GND GND
CP557 CP559
GND GND R1060
CLEAR MW M-CL 18k
LRES
GND GND
GND GND Q1012 XP4311
GND GND 1 6
GND GND selection Voltage(V)
R20
GND GND SSB 0.00 2 5
2.2k TEN-KEY BOARD
GND GND CW/RTTY 1.28
GND GND AM/FM 2.54 3 4
GND GND
FILTER 3.80
OFF 4.93
5V
8V
-8V
0.535V
MAX: 2.75V
-0.614V
R1008 MIN: 0.92V R1009
10k 150k
CNT1 2 4
- 1
3
+
8 R1013
470
0.556V
IC1005a
M5218AFP
-0.549V
MAX: 3.73V
MIN: 0.87V -2.15V
R1007 R1014
10k 180k
CNT2 6
- 7
5
+
C1016 R1018
IC1005b 470
0.1
M5218AFP
-0.555V
1.616V
0.565V
R1037
2.2M
2 4
- 1
M 3
+
D 8 R1039
R1038
56k
820k
CL IC1013a
14.87V M5218AFP
0.669V
R1041
2.2M
MEASUREMENT CONDITIONS 6
frequency: 14.1MHz USB - 7
5
RX no input +
Oscilloscope(20MHz,1MΩ) R1043
R1042
Digital tester IC1013b 56k
820k
Range Input resister M5218AFP
0.551V
200mV 100MΩ 0.65V
2V 11MΩ
20V 10MΩ
Voltage at RX(No designation)
DS1001
DLC-83006S4GT
FAI1
FAI2
C1015
IC1010A
10
M5218AFP -2.16V
8 3
V2 1 +
2 1 80 1
- X22 X43 ADC
R1025 4 2 79 2
X21 X44 M
15 3 78 3
X20 X45 VCC
4 77 V4 4
-0.97V X19 X46 V4R
5 76 V3 5
IC1010B X18 X47 V3R
5 X17 6 75 V2 6
V5 7 + X17 X48 V2R
6 X16 7 74 V1 7
- X16 X49 V1R
R1027 X15 8 73 V2 8
X15 X50 VEE2
15
X14 9 72 9
X14 X51 Y64
X13 10 71 10
X13 X52 Y63
X12 11 70 11
IC1011A
0.21V X12 X53 Y62
M5218AFP X11 12 69 12
X11 X54 Y61
8 3 X10 13 68 13
V4 1 + X10 X55 Y60
2 X9 14 67 14
- X9 X56 Y59
R1029 4 X8 15 66 15
X8 IC1007 X57 Y58 IC1008
15 X7 16 65 Y57 16
HD61203UFS HD61202UFS
X7 X58 Y57
X6 17 64 Y56 17
X6 X59 Y56
2.58V X5 18 63 Y55 18
IC1011B X5 X60 Y55
5 X4 19 62 Y54 19
V3 7 + X4 X61 Y54
6 X3 20 61 Y53 20
- X3 X62 Y53
R1031 X2 21 60 Y52 21
15 X2 X63 Y52
X1 22 59 Y51 22
X1 X64 Y51
V2 23 58 V2 Y50 23
VEE VEE Y50
IC1012A V6 24 57 V6 Y49 24
3.76V V6L V6R Y49
M5218AFP V5 25 56 V5 Y48 25
V5L V5R Y48
8 3 V2 26 55 V2 Y47 26
V6 1 + V2L V2R Y47
2 V1 27 54 V1 Y46 27
- V1L V1R Y46
R1033 4 28 53 Y45 28
VCC TH Y45
15
29 52 Y44 29
DL CL2 Y44
30 51 Y43 30
FS CL1 Y43
IC1012B C1012
5
V1 7 + 4.93V 0.1
6
-
R1035
5VL 15
DISPLAY BOARD
R1022 R1021 R1020 R1019
4.7k 4.7k 4.7k 4.7k
W1020
COM7 1 75
COM7 R/W(WR)
2 74 LEO
SEG68 E(RD)
3 73 R1023 2.2M
SEG67 CL(OSC2)
4 72
SEG66 CS(OSC1)
5 71 LA0
SEG65 A0
6 70
SEG64 SEG0
7 69
SEG63 SEG1
8 68
SEG62 SEG2
9 67
SEG61 SEG3
10 66
SEG60 SEG4
11 65
SEG59 SEG5
12 64
SEG58 SEG6
13 IC1006 63
SEG57 SEG7
SED1522F0C
14 62
SEG56 SEG8
15 61
SEG55 SEG9
16 60
SEG54 SEG10
17 59
SEG53 SEG11
18 58
SEG52 SEG12
SEG51 19 57 SEG13
SEG51 SEG13
SEG50 20 56 SEG14
SEG50 SEG14
SEG49 21 55
SEG15
SEG49 SEG15
SEG48 22 54 SEG16
SEG48 SEG16
SEG47 23 53 SEG17
SEG47 SEG17
SEG46 24 52 SEG18
SEG46 SEG18
SEG45 25 51 SEG19
SEG45 SEG19
5VL
80 1 80
DB1 ADC DB1
79 2 79
DB0 M DB0
78 3 78
GND VCC GND
77 V4 V4 4 77 V4
V4L V4R V4L
76 V3 V3 5 76 V3
V3L V3R V3L
75 V2 V2 6 75 V2
V2L V2R V2L
74 V1 V1 7 74 V1
V1L V1R V1L
73 V2 V2 8 73 V2
VEE1 VEE2 VEE1
72 Y1 9 72 Z1
Y1 Y64 Y1
71 Y2 10 71 Z2
Y2 Y63 Y2
70 Y3 11 70 Z3
Y3 Y62 Y3
69 Y4 12 69 Z4
Y4 Y61 Y4
68 Y5 13 68 Z5
Y5 Y60 Y5
67 Y6 14 67 Z6
Y6 Y59 Y6
66 Y7 15 66 Z7
Y7 Y58 IC1009 Y7
65 Y8 Z57 16 65 Z8
HD61202UFS
Y8 Y57 Y8
64 Y9 Z56 17 64 Z9
Y9 Y56 Y9
63 Y10 Z55 18 63 Z10
Y10 Y55 Y10
62 Y11 Z54 19 62 Z11
Y11 Y54 Y11
61 Y12 Z53 20 61 Z12
Y12 Y53 Y12
60 Y13 Z52 21 60 Z13
Y13 Y52 Y13
59 Y14 Z51 22 59 Z14
Y14 Y51 Y14
58 Y15 Z50 23 58 Z15
Y15 Y50 Y15
57 Y16 Z49 24 57 Z16
Y16 Y49 Y16
56 Y17 Z48 25 56 Z17
Y17 Y48 Y17
55 Y18 Z47 26 55 Z18
Y18 Y47 Y18
54 Y19 Z46 27 54 Z19
Y19 Y46 Y19
53 Y20 Z45 28 53 Z20
Y20 Y45 Y20
52 Y21 Z44 29 52 Z21
Y21 Y44 Y21
51 Y22 Z43 30 51 Z22
Y22 Y43 Y22
FRONT UNIT