Icom IC R8500 Service Manual Addendum page 277

SECTION 11 VOLTAGE DIAGRAM
FRONT UNIT
S1
HV1
HV2
POWER SW
LHV1
LHV2
2SW2
EP2
SW-A BOARD
WFM FM AM SSB/CW TSUP TSDN GND
PB0
PB1
WFM FM AM SSB/CW TSUP TSDN PB2
PB3
AFC/NB AGC 10dB 20dB LOCK APF PB4
PB5
P17
AFC/NB AGC 10dB 20dB LOCK APF P16
SW-B BOARD
1 4 7 DP PROG SKIP MSET
MSET
1 4 7 DP PROG SKIP GND
GND
2 5 8 0 MEMO SEL MCL GND
PB4
PB5
2 5 8 0 MEMO SEL MCL PB6
PB3
3 6 9 CE AUTO VSC BANK PB2
PB1
PB0
3 6 9 CE AUTO VSC BANK P11
P12
MCH ENT PRIO DELAY MW P13
P10
MCH ENT PRIO DELAY MW
JACK BOARD
J1
REC1
REC
1
REMOT E REC2
2
GND W5
HSJ1403-01-010 3
PH
4
PHG
5
PHG
J2 6
W3
FXSP
7
REC
REC 8
W4
RECG
9
HSJ1403-01-010
J1
52030-0929
J3
R4 220
R3 220
R2
220
PHONES
R1 220
H LJ4306-01-3070
W8
W7
W6
P1
1
TO MAIN
2
3 J16
4
ME1
R25
R22 R51
METV W1
1.2K
JPW-01
2.7K 4.7K R23
R24
C5 10K
METER 10K
4.7
GND W2
JPW-01
R28
SE1
L+5
47K
SE2
R27
100K
R32
47K
100K
S1 R31
ESB-64620
P17
PB6
J1
W9 J2
GND
1 9
PB0
2 8
PB1
3 7
PB2
4 6
PB3
5 5
PB4
6 4
PB5
7 3
P17
8 2
P16
9 1
52030-0929 52610-0971 AN11
C1
12P
R1
1M
C2
X1
9.8304MHZ
12P
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
R49 R50 DA
22K 22K DF
DB
J1 W8 J3
GND C20
1 14
GND 0.01
2 13
GND
3 12
PB4
4 11
PB5
5 10
PB6
6 9
PB3
7 8
PB2
8 7
PB1
9 6
PB0
10 5
P11
11 4
P12
12 3
P13
13 2
P10
14 1
52030-1429 52610-1471
VR-A BOARD
W1 0
R1 J1 J4
GND GND
1 6
APF STF2 SFT2
2 5
APFV
APFV R45 10K
3 4
SFTV SFTV
4 3
L +5 L+5 R46 10K
5 2
SFT1
SHIFT STF1
6 1
52610-0671 52610-0671
RV-306 C17 C18
0.0047 0.0047
VR-B BOARD
W1 1
R1 J1 J5
PB2 PB2 PB2
1 6
GND GND
MEMO 2 5
P10
P10 P10
3 4
DELV DFLV R47 10K
4 3
PB3 PB3 PB3
5 2
DELAY L +5 L+5
6 1
C19
52610-0671
0.0047
52610-0671
RV-307
P2 J6
REC1 REC1
3 3
REC2 REC2
2 2
GND GND
1 1
P1
B3B-ZR-SM4-TF
B3B-ZR-SM4-TF
PH
1
PHG
2
EXSP
TO MAIN
3
PHG RL1
4 J19
REC ATQ203SA
5
RECG
6
11 - 1
PQ20VZ51J00H IC5
HRT-3290A
DS2 DS3 DS4 DS5
HRT-3290A HRT-3290A HRT-3290A
G
6
5 4 3 2 1
C7
R56
R26 0.01
10
47K
C9
DS1
10
Q7
DLC-7982YBGT
D TC114EU
R30 1M
R29
9
10
100K
8
C10
0.001 BU4030BF I C3C
R34 1M
R33
12
11
100K
13
C11
I C3D BU4030BF
0.001
1
PC3/AN11 P97/SEG40/CL1
2
AVSS P96/SEG39/CL2
3
TEST P95/SEG38/D0
4
X2
5
X1
6
VSS
7
OSC1
8
OSC2
9
RES
10
MD0
11 IC1
P20/IRQ4/ADTRG
12
HD6433833A74HV
P21/UD
13
P22
14
P23
15
P24
16
P25
17
P26
18
P27
19
P30/SCK1
20
P31/SI1
21
P32/SO1
22
P33/SCK2
23
P34/SI2
24
P35/SO2
25
P36/STRB
AN11
AN10
R2 R3 R4 R5
10K 10K 10K 10K
C14
0.01
AN9
Q2
100
Q3
R52
R42
R41 AN7
R53 100
AF VR RV-305 10K
C15
D2 0.0047
Q6 Q4
1SS355
D TC114EU
Q5
R44
R43 AN8
SQL VR RV-305 10K
C16
0.0047
R6 R7 R8 R9 R10
4.7K 4.7K 4.7K 4.7K 4.7K
C3
0.01
75
SG40
74 SG39 IC2
73 SG38
72 SG37
P94/SEG37/M
71
SG36
P93/SEG36
70 SG35
P92/SEG35
69 SG34 DCM 7 1
P91/SEG34 COM7
68 2
SG33 DT68
P90/SEG33 SEG68
67 SG32 DT67 3
P87/SEG32 SEG67
66 SG31 DT66 4
P86/SEG31 SEG66
65 SG30 DT65 5
P85/SEG30 SEG65
64 6
SG29 DT64
P84/SEG29 SEG64
63 SG28 DT63 7
P83/SEG28 SEG63
62 SG27 DT62 8
P82/SEG27 SEG62
61 9
SG26 DT61
P81/SEG26 SEG61
60 SG25 DT60 10
P80/SEG25 SEG60
59 SG24 DT59 11
P77/SEG24 SEG59
58 SG23 DT58 12
P76/SEG23 SEG58
57 13
SG22 DT57
P75/SEG22 SEG57
56 SG21 DT56 14
P74/SEG21 SEG56
55 SG20 DT55 15
P73/SEG20 SEG55
54 SG19 DT54 16
P72/SEG19 SEG54
53 17
SG18 DT53
P71/SEG18 SEG53
52 SG17 DT52 18
P70/SEG17 SEG52
51 SG16 DT51 19
P67/SEG16 SEG51
20
DT50
SEG50
DT49 21
SEG49
DT48 22
SEG48
DT47 23
SEG47
24
DT46
SEG46 SED1522F0C
DT45 25
SEG45
R55
14
1M
V+
0.01 C13 GND
IC3 R54
7 1
3
100K
2
I C3A
BU4030BF
R37
100K
DTA144EU
Q1
2SC4081
R39
DTC144EU
0.01 C21
220K
R38
C23 R40 D1
470K
0.1 220K 1SS355
DTA144EU
5
4
6
DTC144EU
BU4030BF I C3B
DISP BOARD
C4
0.01
R11 R12
100K 100K
75 DB
R/W(WR)
74
DF
E(RD)
73
CL(OSC2)
72
CS(OSC1)
71 R14 R13 DA
A0
70
DT00 1M 1M
SEG0
69 DT01
SEG1
68 DT02
SEG2
67
DT03
SEG3
66 DT04
SEG4
65 DT05
SEG5
64 DT06
SEG6
63
DT07
SEG7
62 DT08
SEG8
61 DT09
SEG9
60 DT10
SEG10
59
DT11
SEG11
58 DT12
SEG12
57 DT13
SEG13
56
DT14
SEG14
55 DT15
SEG15
54 DT16
SEG16
53 DT17
SEG17
52
DT18
SEG18
51 DT19
SEG19
J7 P1
13.8 13.8
W9 W1 4
1 1
+5 +5
2 2
GND GND
3 3 TO MAIN
GND GND
4 4
J10
M RXD W1 0 W1 3 MRXD
5 5
MTXD MTXD
6 6
GND W1 1 W1 2 GND
7 7
PD09A-07M J7P
C22
0.01
R57
J8
10
FANV
1
NC
2
NC
3
GND
4
B04B-EH-S