Icom IC-M88 Service Manual page 36

LOGIC UNIT
J401
37
VCC
1
VCC
2
VOLIN VOLIN
3
GND
4
BTYPE
5
S5V
6
M5V
M5V
7
V5VS V5VS
8
R5VS R5VS
9
T5VS T5VS
10
GND
11
MICO
12
SMICO
SMICO
13
GND
14
W/NS
15
TEMPV TEMPV
16
LOINV LOINV
17
CDECV CDECV
18
UNLKI
19
GND
to
20
MAIN MODIN MODIN
21
UNIT
CDTENC
CDTENC
J351 22
GND
23
VSSTBO VSSTBO
24
EXSTBO EXSTBO
25
DASTBO DASTBO
26
PLSTBO PLSTBO
27
SDATAO SDATAO
28
SCLKO SCLKO
29
EXOEO EXOEO
30
GND
31
WDECV WDECV
32
RSSIV RSSIV
33
NOISV NOISV
34
TDETV TDETV
35
BEEPO BEEPO
36
38
Common
Transmit
Receive
SMICO
Power
supply
M5V
CDTENC
J411
VOLIN
MODIN
1 VOLIN
to 4
2 VOLO
VR
3
UNIT
5
AFOUT
Q411
Q441
2SC4213
2SC4116
AFOUT
CP441 S5V
R441
R411
C441
470k
SP1 47p 10k
SPE ISPMS
CP442
R442
470k
Q442
CPH3403
MP441 R443
100k
Q443
CPH3403
Q444
MC461
DTC144EU
SKB-2746 C413
0.1
W462
+
INMIC
INT SP: 0.0V
EXT SP: 5.00V
R461 C461
33k 0.001
–
W461
AFOUT
PTT
ISPMS
S461
EVQ-PUL
VCC
CHASSIS S5V
EXT PTT ON: 0.0V
J41 EXT PTT OFF: 4.45V INMIC
J851
EP459
9 EXTPTT CP459 EXTPTT
9
EP458
8 EXTMIC CP458 EXTMIC
8
7 EXTTXD EXTTXD
CP457
7
6 EXTRXD CP456 EXTRXD
6
5 ERESET CP455 ERESET
5
EP454
4 GND CP454 GND
4
3 EDETEDT CP453 EDETEDT
3
VCC
EP452
2 EXTVCC EXTVCC
CP452
2
AFOUT EP451 R451 C451
1 CP451 AFOUT
1 0.001
47
C452 C453
0.001 0.1
CONNECTOR
UNIT
LEDS1
LEDS2
W/NS
VCC S5V S5V
DS651
FY1101F-TR
LED ON: 5.00V
BTYPE DS652
FY1101F-TR
S5V
R651 R652
330 220
R653
LEDS2 1k
1
5
2
R654
MICO
680
3 4
LEDS1
Q651
LED ON: 5.00V
W/NS
XP1213
BTYPE
R611 C612
10k 0.022
BEEPO
C611 R612
0.001 4.7k
R621
470k
C621
CP621 CP622 CP623
0.001
C622 C623
CP624 CP625 CP626
0.001 0.001
BEEPO
R631
10k
UNLKI
EXOEO
VSSTBO
EXSTBO
R632
100k
R633
10k
DASTBO
PLSTBO
SDATAO
SCLKO
W/NS
MICO
S5V
VCC
AF7V
C421 C422 C423
10 0.1 0.001
C411
R413
0.47
33k
IC421
R431
TA7368F
27k
BEEPO
TX: 0.40V
R412 C412 1 10
RX: 3.29V
NC POUT
10k 0.47
2 9
VCC PWGND
3 8
NC PREGND
4 7 L421
VIN PHASE
5 EXCCL3216U1
6
RIPPLE NF
R414 R415
4.5M 1.5M
R421 R422
33 10
C425
C427 C431 R432
47p
150 1 1M
C424 C426
10 0.047
AFOUT
EXRES
VCC
S5V
INMIC Q461
R467
UNR911HJ
470
R454
R453
10k
1k
EXTMIC
INMIC
EXTTXD ETXD ETXD
PTT ON: 4.75
EXTRXD ERXDI ERXDI R464
PTT OFF: 0.0V
15k
EXMIC
ERESET EXRES
EDETEDT EXTSV EXTSV
Q462
EPTTI EPTTI UNR911FJ
R452
EXTPTT
1k
C456 D452 D453 D454 C457
D451 0.1 MA8056 MA8056 MA8056 47p
C454 C455
MA8062
47p 0.1
DS653
SML-311YT
C642
C641
22 0.01
SQL
DS654
SML-311YT
CPU5V
S641
EVQ-PUL SQL
CENC1 CENC1
CENC2 CENC2
CP642
CENC3 CENC3
PTTIN PTTIN
EPTTI EPTTI
BTYPE
C643
TDEC
0.01
CP641
SQL
UP
DOWN
CH/WX
16/9
SCAN
H/L
TDEC
S642 S644 S646
SCRMS
UNLK
EXOE
S643 S645 S647
W641
UNLK
EXOE
BEEP
CPU5V
WETIN
VSSTB
UNLK EXSTB
DASTB
EXOE
VSSTB PLSTB
EXSTB SDATA
SCLK
R583
DASTB
100k
PLSTB
SDATA ERXDI
SCLK
R582
ETXD 1k
C582
47p
W/NS
SMICO
MICO
M5V
CDTENC
MODIN
4.95V
S5V S5V
VCC VCC
Q551
5.00V
2SB1132
Q431
TX: 0.0V
M5V
2SB1132 RX: 7.15V
AF7V
Q561
C551
2SA1588
22 6 5 4
Q432
6 5 4
XP6501
R561
10k
R434
1 2 3 Q552
2.2k
XP6501
1 2 3
R562 Q553
4.7k
DTC144EU R552
2.2k
R433 C432 R435
2.2k 0.1 3.3k
C555
C561
0.22
0.01
W/NS
EXRES
ISPMS
MODIN
CDTENC
SMICO
INMIC MICO
S5V
C465 R466 R469 C462 C463 R463 R471
0.01 10k 270k 0.1 0.01 2.2k 47k
C471
0.01
IC471
R462
PTTIN
4.7k NJM2904V
C467
1.97V
10 C464 R465
4
5
0.1 120k
6 3
7 2
1
8
1.97V
C466 R468
C473
0.1 100k 0.01
R473
R478
4.7k
4.7k
R470
R472
100k
18k
MOD3V
LEDS1
LEDS2
CONT2
W/NS
CONT1
60
91 SEG9
VSS0 S9
92 59 SEG8
VDD0 S8
93 58 SEG7
S7
P60
57
94 S6 SEG6
P61
95 56 SEG5
S5
P62
96 55 SEG4
P63 S4
54 SEG3
97
P64 S3
98 53 SEG2
S2
P65
99 S1 52 SEG1
P66
51 SEG0
100 S0
P67
101 SCOM0 50
P40
49
102 COM3
P41
48 COM2
103 COM2
P42
104 47 COM1
COM1
P43 IC661
46
105 COM0
P44 COM0
106 µPD780316GC 45
VLC2
P45
107 44
VLC1
P46
43
108
P47 VLC0
109 42
P50 VLCDC
110 41
P51
CAPL
40
111
P52 CAPH
112 39 CPU5V
P53 AVREF1
113 38 ATIS
P54 P120/AO0
37
114 AVSS0
P55
115 36
P56 ANI9
35
116
P57 ANI8
34
117
P70/TO4 P17/ANI7
118 33
P16/ANI6
P71/TI4
32
119
P72/TO52 P15/ANI5
120 31
P73/TI52 P14/ANI4
C665 C666
0.047 0.033
CPU5V
C662
0.047
C603 R603
33p 12k
C664 OSC1
0.047
X601
9.8304 MHZ: 4.32 Vp-p
CR-747
R601
R602 D601 R605
10
1M MA77 12k
CPU5V
C601 C602 R604 C604
22p 7p 12k 0.01
ERXDI
ETXDO
ESCK
ESDA
CPU5V
R581 D581
MA2S111
10k RES
EXRES
C591
0.01
IC581
S-80942CNMC-G9C
1 OUT 5
CPU5V CD
2 VDD
4
3 VSS
NC
W581 C581
0.027
EXRES
BATTV
S5V
VCC
C552 C553
R538
0.001 10
1k
R571
330k
4.90V
IC551
NJM2870
R551 C535 Q532
1 VIN 5
CTRL 0.01
10k
2 2SC4116
GND
3 4
NB VOUT R537 R536
R572 C571 47k 47k
C554
TRANSMIT
150k 0.01
0.01 CTCS CODE: 3.32Vp-p
C534
820p C533
R540
0.1
15k
CPU5V
R553
C536 R539
22k
0.047 47k
C556 C557
0.001 22
W/NS
EXRES
ISPMS
MODIN
CDTENC
SMICO
TX: 2.03V
RX: 1.95V
S5V
C481
0.01
R493 R495 C491
560k
4.7k 0.01
R475 R476
IC481
27k 3.9k
TC4W66FU
R474 IC491
4.7k
MICO
1 8 NJM2904V
MICMS
MOD 2 7
MOD3V R491
STXMS 3 6 1 8
15k
4 MOD 2
5 7
3 6
4 5
C472 R477 R481 R482
47 2.2k 100k
100k
R494
100k
MOD3V
11 - 3
DS681
L2-0390TAY
CONT2
CONT1
R681 R682 R683 R684
820k 270k
390k 1.8M
IC681
TC4W66FU
1 8 CPU5V
2 7 CONT2
CONT1 3 6
C682 C683 C684
4 5
0.47 0.47 0.47
C681
0.1
C685
0.47
C671
CDECV
0.1
TEMPV
LOINV
RSSIV
NOISV
TDETV
C667 C668 C669 C670
0.047 0.047 0.047 0.047
ATIS
5.02V
CPU5V CPU5V
WDECV
EXTSV
C663 C661
0.047 0.047
CPU5V
R606
1k
C605 C606
47p 0.01
ESCK
ESDA
CPU5V
R591
10k
IC591 R592
10k
HN58X2416TI
1 8
A0 VCC
2 7
A1 WP
3 6 ESCK
A2 SCL
4 5
VSS SDA
CPU5V
R531
R532
22k
22k
CENC3
R533
56k
CENC2
R534
180k CENC1
R535
10k Q531
XP1213
C531
0.047 LDTFS
4 3
TRANSMIT CTCS: 0.08Vp-p
2
C532
0.039
5 1
TRANSMIT DTCS: 4.99V
LDTFS LDTFS
W/NS
W/NS
ISPMS ISPMS
MODIN
R497 C492
WIDE: 0.0V
180k 1
NARROW:4.97V
R498 R492
R512 C512 R513
100k 220k
150k 0.1 18k
S5V ATIS
R496
220k
R511 C511
27k 0.0033
R502
Q501
33k
DTC144EU
C504
0.0015
R503 W/NS
C503
C502
120k
0.0047
150p
S5V R521
W522 W523
680
MODIN
TX: 1.93V
RX: 1.96V
R504 C521 C522
R501 10k 0.1 0.022
100k