Icom IC-R75 Service Manual page 44

SECTION 10 VOLTAGE DIAGRAM
10-1 FRONT UNIT
LOGIC BOARD
IC351 M62354GP
FRONT UNIT
5VL
1 DO VCC 16
2 VDD 15
LD
3 AO6 14 Q351
CLK T1K
4 AO5 13
DI DTC114EU R257 6.8 k
5 AO4 12 DIMV T2K
AO1
6 AO2 AO3 11 BEPV
T3K
7 NC NC 10 R351
8 VSS 9 R352
GND 6.8 k 6.8 k T4K R258 6.8 k
BPCK
T5K
C351 C352 BEEP
0.1 22
T6K R259 6.8 k
AFGV
RFGV
T7K
IC401C IC401D
T8K R260 6.8 k
TC74HC04AF TC74HC04AF
MAIN DIAL T9K
MUP 5 6 9 8 DCK
TDK R261 6.8 k
J461 R361
B4B-PH-SM3-TB 220 k
IC401F IC401E
T0K
GND 4 GND TC74HC04AF TC74HC04AF
MDN 4 MDN R262 6.8 k
3 3 13 12 11 10 ENTK
MUP MUP MDN DUD
2 2
5VL 5VL
1 1 R362
5 4 220 k
C256
0.1
EP1
RMS20-250-201-1R
1 2 3 C461
0.1
D461
NNCD6.2G
VR BOARD
GND GND
1 10
GND 2 9 GND
GND GND
R131 3 8
GND GND
TP96D26-22F-10KBX2-2240 4 7
GND GND
5 6
PB2L PB2L
6 5 CRES
PBT2 PB1L 7 PB1L
4
RFGL 8 RFGL
AFGL 3 AFGL
9 2 DUD
5VL 5VL
PBT1 10 1 RSTB
DAST
ISTB
C454 C453 ASTB
RF/SQL C452
0.1 0.1 0.1
MCK
C451
0.1
AF R143
6.8 k MDAT
PCK
R141
TP96D00-22F-10KBX2-2240 PST1
PDAT
PST2
L121 PST3
GND 10 GND
HF50ACC322513-B 1
AFE AFE
2 9 AFE
AFE 3 8
R121 AFE AFE
100 4 7
ESPO ESPO
5 6 R335
R122 ESPO ESPO R231 100 k
6 5 47 k
100 ESPO ESPO
7 4
AFO AFO
8 3 AFO
C121 C123 AFO 9 2
AFO AFO
0.0047 0.0047 10 1
C122
J101 52793-1090
0.0047 C231
PHONE BOARD 0.1
H5VL
SP1 P1
VS-50-0827 J491 L491
PHR-2 B2B-PH-SM3-TB HF50ACC322513-B
AFE AFE
2 2
ISPO 1 ISPO
1
W1 L492
HF50ACC322513-B
W2
INT SP AFO
16
AFO
15
ESPO
14
13 ESPO
ISPO
12
ISPO
11 C503
AFE 4.9 V
10 0.1 EP501 L502
AFE 120 µH
9 MMZ1608Y102BT
8 5V
GND
7
8V
6
GND
5 14V
4
HV
3
H5V
2
BATT
1
3.0 V
PWRC
16
15 DSPS
14 DINT
DSTB
13
RSTB
12
11 ISTB
ASTB
10
MDAT
9
MCK
8
7 DRES EP521 MMZ1608Y102BT
6 PDAT EP522 MMZ1608Y102BT
PCK EP523 MMZ1608Y102BT
5
PCO2 EP524 MMZ1608Y102BT
4
PST1 EP525 MMZ1608Y102BT
3
2 PST2 EP526 MMZ1608Y102BT
PST3 EP527 MMZ1608Y102BT
1
RFGV
16
AFGV
15
SML
14
13 FMNL
EMTI
12
SALI
11
BEEP
10
9 RECS
SQLS
8
AGRS
7
RXS
6
SBSY 4.5 V
5 SPST
4
GND
3
CIV
2
CIVE
1
LEFT SIDE 11 - 1
5VL
ETXD
C201 0.1
ERXD VMK R271 47 k
C202 0.1 R211 1 k RECS MWK R272 47 k
DCK
CLRK R273 47 k
C203 0.1 BKUP SELK
R256 6.8 k R274 47 k
R210 1 k SQLS SCAK R275 47 k
R255 6.8 k C204 0.1
R209 1 k AGRS UPK R276 47 k
R254 6.8 k C205
R208 1 k RXS DNK R277 47 k
R253 6.8 k 0.1
BPCK LOCK R278 47 k
R252 6.8 k PWRS
SSBK R279 47 k
R206 1 k SML CWK R280 47 k
R251 6.8 k C206
0.1 R205 1 k FMNL FMK R281 47 k
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
C105 C104 C103 NBK R288 47 k
0.1 0.1 10
ANFK R289 47 k
NRK R290 47 k
ATTK R291 47 k
PREK R292 47 k
C255 C254 C253 C252 C251
0.1 0.1 0.1 0.1 0.1
C111
20 P X111 1 75 CL1
C112 CM200S C101 PC3/AN11 P97/SEG40/CL1
0.1 2 74 CL2
22 P AVSS P96/SEG39/CL2
3 73 DO
TEST P95/SEG38/D0
X112 CR-567 4 X2 P94/SEG37/M 72 M
5 71
X1 P93/SEG36
C113 30 P 6 70
R112 VSS P92/SEG35 R198 100 k
7 69 R197 1k PCO2
C114 30 P 1 M OSC1 P91/SEG34
8 68 R196 1 k DSTB
OSC2 P90/SEG33
9 RES P87/SEG32 67 R195 1k DINT
10
MD0 P86/SEG31 66 R194 1 k DSPS
R121 1k 11 65 R193 1k SPST
P20/IRQ4/ADTRG P85/SEG30
12 64 R192 1 k SBSY
P21/UD P84/SEG29
R122 1k 13 IC101 63 R191 1k DRES
P22 P83/SEG28
14 HD6433837SC58H 62
P23 P82/SEG27
R123 1k 15 P24 P81/SEG26 61
16 60
P25 P80/SEG25
R124 1k 17 59 R179 1k SALI
P26 P77/SEG24 Power on: 4.8 V
18 58 R178 1k EMTI
P27 P76/SEG23 Power off: 0 V
R125 1k 19 57 R177 1k CLKK
P30/SCK1 P75/SEG22
20 P31/SI1 56 R176 1k SETK
21 P74/SEG21
R126 1k P32/SO1 P73/SEG20 55 R175 1k LOCK PWRS
R127 220 22 54 R174 1k DNK
P33/SCK2 P72/SEG19
R128 1k 23 53 R173 1k UPK
P34/SI2 P71/SEG18
R129 1k 24 52 R172 1k SCAK
P35/SO2 P70/SEG17
R130 1k 25 51 R171 1k SELK
P36/STRB P67/SEG16
R131 1k R163 47 k
PWRC
R162 47 k
R161 47 k
R155 1k CLRK
MWK
IC231 X25320SI-2.7
R154 1k R153 1k VMK
AGCK W163
1 CS VCC 8 R152 1k
2 7 C102 R151 1k NBK
SO HOLD
3 SCK 6 0.1 R150 1k ANFK
WP
4 SI 5 R149 1k NRK
VSS W162
R148 1k ATTK
R147 1k PREK
R146 1k TSK
W161
R223 R145 1k FILK
R221 470 10 k R224 10 k
R144 1k FMK
R143 1k AMK
C221 R142 1k CWK 4.9 V
0.1 R397
R225 10 k R141 1k SSBK 220 k
Q391
2SC4116 BL
H5VL
4.8 V
5VL
14V
C502
L503 HF50ACC322513-B HV R392 56 k
0.1
B5V
EP502 L501
120 µH
MMZ1608Y102BT 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
R511 0.1 6 5 4 Power off: 3.0 V
2.2 M
Q512
XP4601
R513
39 k 1 2 3
R512
10 k
DISPLAY BOARD
• 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) • COM0
• DUD 4.8 V
4.8 V
3.2 V
1.6 V
1.1 V
0 V
8 ms
0 V
• M • DO(Variational follow the display)
4.8 V 4.8 V
• IC101-8pin • IC101-4pin
4.3 V 2.6 V
2.4 V 1.5 V 0 V 0 V
2 ms 25 µs
0 V 0 V 30.5 µs
102 ns
1.3 V
2.8 V
4.8 V
H5VL H5VL H5VL
1 16 50
M M NC
2 15 Pals 14µs 49
DO DO NC
3 14 • CL1 C101 48
CL2 4 13 CL2 NC
4.8 V 0.1 47 NC
CL1 5 12 CL1 46
V3 V3 VCC
6 11 45
V2 V2 NC
7 10 M 44
V1 V1 M
8 9 43
COM1 COM1 NC
9 8 0 V 42
COM2 10 7 COM2 2 ms DO
DO 41 DI
COM3 11 6 COM3 CL2 40
COM4 COM4 CL2
12 5 39
GND GND SHL
13 4 38
DIMV DIMV NC
Power on: 0 V 14 3 CL1 37
Q421 Power off: 4.9 V GND GND CL1
15 2 • CL2 36 GND
DTA144EU 14V 16 1 14V
4.8 V V2 35 V4
V3 34
V3
PWRS 33
V2
V1 32
R421 R422 V1
31
R423 470 100 k VEE
0 V
10 k 32 µs
PWRC
13.6 V
H5VL
R405
100 k DS81 DS71 DS61 DS51
4.8 V 4.8 V
TLYE1002 TLYE1002 TLYE1002 TLYE1002
R401 R402
R399 33 k 6.8 k
14
10 k ETXD
0 V 2 1
5.2 V DS82 DS72 DS62 DS52
R395 D401 TLYE1002 TLYE1002 TLYE1002 TLYE1002
1SS355 7
470 k IC401A
C401
6 5 4 TC74HC04AF
R396 C392 R394 0.1
220 k C395 Q401
0.22 1 k DS83 DS73 DS63 DS53
0.1 XP4601 TLYE1002 TLYE1002 TLYE1002 TLYE1002
1 2 3 R404 IC401B *8.0 V
D393 15 k
R393 TC74HC04AF
1SS355 47 k 5 Q81 Q71 Q61 Q51
1 ERXD *4.8 V
3 4 2SC4116 BL 2SC4116 BL 2SC4116 BL 2SC4116 BL
4
R403
2
IC391 100 k 4.8 V *4.2 V
S-80942ANMP-DD6 3
R398
100 k
1 CD 5 W401 R82 R81 R72 R71 R62 R61 R52 R51
OUT
2 VDD 220 330 220 330 220 330 220 330
3 NC 4
VSS IC392
TC7S08F
C393 C394 5.2 V
0.22 22 P
*: BK LIGHT=10
DS101
HLC7395-012400
81
Y50
82
Y49
83
Y48
Y47 84
85
Y46
86 SE1
Y45
87 SE2
Y44
88 SE3
Y43
Y42 89 SE4
IC101 Y41 90 SE5
91 SE6
Y40
HD66100F 92 SE7
Y39
93 SE8
Y38
94 SE9
Y37
Y36 95 SE10
Y35 96 SE11
97 SE12
Y34
98 SE13
Y33
99 SE14
Y32
Y31 100 SE15
14V
DS41 DS31 DS21 DS11
TLYE1002 TLYE1002 TLYE1002 TLYE1002
DS42 DS32 DS22 DS12
TLYE1002 TLYE1002 TLYE1002 TLYE1002
DS43 DS33 DS23 DS13
TLYE1002 TLYE1002 TLYE1002 TLYE1002
Q41 Q31 Q21 Q11
2SC4116 BL 2SC4116 BL 2SC4116 BL 2SC4116 BL
R42 R41 R32 R31 R22 R21 R12 R11
220 330 220 330 220 330 220 330
RIGHT SIDE