Voltage Diagram; Front Unit - Icom IC-R75 Service Manual

SECTION 10

VOLTAGE DIAGRAM

10-1 FRONT UNIT

LOGIC BOARD
FRONT UNIT
MAIN DIAL
J461
B4B-PH-SM3-TB
GND GND
4
4
MDN MDN
3 3
MUP MUP
2 2
5VL 5VL
1 1
5 4
EP1
RMS20-250-201-1R
1 2 3
D461
NNCD6.2G
VR BOARD
GND
1 10
GND
2 9
GND
R131 3 8
GND
TP96D26-22F-10KBX2-2240 4 7
GND
5 6
PB2L
6 5
PB1L
PBT2 7
4
RFGL
8
3
AFGL
9
2
5VL
PBT1 10
1
RF/SQL C454 C453 C452
0.1 0.1 0.1
AF R143
6.8 k
R141
TP96D00-22F-10KBX2-2240
L121
GND GND
10
HF50ACC322513-B 1
AFE AFE
2 9
AFE AFE
3 8
R121
AFE AFE
100 4 7
ESPO ESPO
5 6
ESPO
R122 ESPO
6 5
100 ESPO
ESPO
7 4
AFO AFO
8 3
AFO AFO
C121 C123 9 2
AFO AFO
0.0047 0.0047
10 1
C122
J101 52793-1090
0.0047
PHONE BOARD
SP1
P1
J491 L491
VS-50-0827 PHR-2
B2B-PH-SM3-TB HF50ACC322513-B
AFE
2
2
ISPO
1 1
L492
W1
HF50ACC322513-B
W2
INT SP
AFO
16
AFO
15
ESPO
14
ESPO
13
ISPO
12
ISPO
11
AFE
10
AFE
9
5V
8
GND
7
8V
6
GND
5
14V
4
HV
3
H5V
2
BATT
1
PWRC
16
DSPS
15
DINT
14
DSTB
13
RSTB
12
ISTB
11
ASTB
10
MDAT
9
MCK
8
DRES EP521 MMZ1608Y102BT
7
PDAT EP522 MMZ1608Y102BT
6
PCK EP523 MMZ1608Y102BT
5
PCO2 EP524 MMZ1608Y102BT
4
PST1 EP525 MMZ1608Y102BT
3
PST2 EP526 MMZ1608Y102BT
2
PST3 EP527 MMZ1608Y102BT
1
RFGV
16
AFGV
15
SML
14
FMNL
13
EMTI
12
SALI
11
BEEP
10
RECS
9
SQLS
8
AGRS
7
RXS
6
SBSY
5
SPST
4
GND
3
CIV
2
CIVE
1
COMPLETE VIEW
IC351 M62354GP
1 VCC 16 5VL
DO
2 VDD 15
LD
3 AO6 14 Q351
CLK T1K
4 AO5 13
DI DTC114EU
R257 6.8 k
DIMV
5 AO4 12 T2K
AO1
6 AO3 11 BEPV
AO2
T3K
7 NC 10
NC R351 R352
8 VSS 9 R258 6.8 k
6.8 k
GND 6.8 k T4K
BPCK
T5K
C351 C352
BEEP
0.1 22 R259 6.8 k
T6K
AFGV
RFGV
T7K
IC401C IC401D
R260 6.8 k
T8K
TC74HC04AF TC74HC04AF
T9K
MUP 5 6 9 8 DCK
R261 6.8 k
R361 TDK
220 k
IC401F IC401E
T0K
TC74HC04AF TC74HC04AF
R262 6.8 k
ENTK
MDN 13 12 11 10 DUD
R362
220 k
C461
0.1
GND
GND
GND
GND
GND
PB2L
CRES
PB1L
RFGL
AFGL
DUD
5VL
RSTB
DAST
ISTB
ASTB
MCK
C451
0.1
MDAT
PCK
PST1
PDAT
PST2
PST3
R335
47 k
H5VL
AFE
ISPO
C503
0.1
EP501 L502
120 µH
MMZ1608Y102BT
3.0 V
4.5 V
11 - 1
5VL
C201 0.1
C202 0.1
C203 0.1
R256 6.8 k
R255 6.8 k C204 0.1
R254 6.8 k C205
0.1
R253 6.8 k
R252 6.8 k
R251 6.8 k
C206
0.1
C105
0.1
C256 C255 C254 C253 C252 C251
0.1 0.1 0.1 0.1 0.1 0.1
C111
X111 1
20 P
C101 PC3/AN11
C112 CM200S
2
0.1
22 P AVSS
3
TEST
4
X112 CR-567 X2
5
X1
C113 30 P 6
R112 VSS
7
C114 30 P 1 M OSC1
8
OSC2
9
RES
10
MD0
R121 1k 11
P20/IRQ4/ADTRG
12
P21/UD
IC101
R122 1k 13
P22
14 HD6433837SC58H
P23
R123 1k 15
P24
16
P25
17
R124 1k
P26
18
P27
19
R125 1k
P30/SCK1
20
P31/SI1
R126 1k 21
P32/SO1
R127 220 22
P33/SCK2
R128 1k 23
P34/SI2
R129 1k 24
P35/SO2
R130 1k 25
P36/STRB
R131 1k
R231 100 k
IC231 X25320SI-2.7
1 VCC 8
CS
2 C102
7
SO HOLD
0.1
3
6
WP SCK
4 SI 5
VSS
C231
0.1
R223
10 k R224 10 k
R221 470
C221
0.1
R225 10 k
4.9 V C502
L503 HF50ACC322513-B
0.1
EP502 L501
MMZ1608Y102BT 120 µH
ETXD
ERXD
VMK R271 47 k
R211 1 k RECS
MWK R272 47 k
DCK
CLRK R273 47 k
BKUP SELK
R274 47 k
R210 1 k SQLS SCAK
R275 47 k
R209 1 k
AGRS UPK R276 47 k
R208 1 k
RXS DNK
R277 47 k
BPCK LOCK R278 47 k
PWRS SSBK R279 47 k
R206 1 k SML
CWK R280 47 k
R205 1 k FMNL R281 47 k
FMK
R204 1 k
PB2L
AMK R282 47 k
R203 1 k PB1L FILK
R283 47 k
R202 1 k
RFGL TSK R284 47 k
R201 1 k AFGL SETK R285 47 k
B5V CLKK R286 47 k
AGCK R287 47 k
C104 C103
NBK R288 47 k
0.1
10
ANFK R289 47 k
NRK R290 47 k
ATTK R291 47 k
PREK R292 47 k
75 CL1
P97/SEG40/CL1
74
CL2
P96/SEG39/CL2
73 DO
P95/SEG38/D0
72 M
P94/SEG37/M
71
P93/SEG36
70
R198 100 k
P92/SEG35
69 R197 1k PCO2
P91/SEG34
68 R196 1 k DSTB
P90/SEG33
67 R195 1k DINT
P87/SEG32
66
R194 1 k DSPS
P86/SEG31
65
R193 1k SPST
P85/SEG30
64 SBSY
R192 1 k
P84/SEG29
63 R191 1k DRES
P83/SEG28
62
P82/SEG27
61
P81/SEG26
60
P80/SEG25
59 R179 1k SALI
P77/SEG24
Power on: 4.8 V
58
R178 1k EMTI
P76/SEG23 Power off: 0 V
57
R177 1k CLKK
P75/SEG22
56 R176 1k SETK
P74/SEG21
55 R175 1k LOCK
PWRS
P73/SEG20
54 R174 1k DNK
P72/SEG19
53 R173 1k UPK
P71/SEG18
52 R172 1k SCAK
P70/SEG17
51 R171 1k SELK
P67/SEG16
R163 47 k
PWRC
R162 47 k
R161 47 k
R155 1k CLRK
MWK
R154 1k R153 1k VMK
W163
AGCK
R152 1k
R151 1k NBK
R150 1k ANFK
R149 1k NRK
W162
R148 1k ATTK
R147 1k PREK
R146 1k TSK
W161
R145 1k FILK
FMK
R144 1k
R143 1k AMK
R142 1k CWK
4.9 V R397
R141 1k SSBK
220 k
Q391
2SC4116 BL
H5VL
4.8 V
5VL
14V
R392 56 k
HV
B5V
13.8 V
D382
MA729 R391
D381
Q511
39 k
MA8051 M
2SA1576 R
R514
6.8 k R381
R382
1 k
47 k
C505
Power on: 4.8 V
0.1
R511 6 5 4
Power off: 3.0 V
2.2 M
Q512
XP4601
R513
39 k 1 2 3
R512
10 k
• DCK/DUD (At turn the main dial to the clockwise)
• DCK • BPCK (At beep on)
4.8 V 4.8 V
0 V 0 V
1 ms
(2 ms)
• DUD
4.8 V
0 V
• IC101-8pin • IC101-4pin
2.4 V 4.3 V 1.5 V
0 V 0 V
102 ns
Power on: 0 V
Q421
Power off: 4.9 V
DTA144EU
PWRS
R421 R422
470 100 k
R423
10 k
PWRC
H5VL
4.8 V
R401 R402
R399 33 k 6.8 k
10 k
0 V
5.2 V D401
R395
1SS355
470 k
6 5 4
R396
C392 R394
Q401
220 k
0.22 1 k C395
0.1 XP460
R4
1 2 3
D393
R393 15
1SS355
47 k 5
1
4
R403
2
100 k
IC391
3
S-80942ANMP-DD6
R398
100 k
1 CD 5 W401
OUT
2
VDD
3 NC 4
VSS
IC392
TC7S08F
5.2 V
C393 C394
22 P
0.22