Icom IC-R75 Service Manual page 43

• DCK/DUD (At turn the main dial to the clockwise)
• DCK • BPCK (At beep on)
4.8 V 4.8 V
R272 47 k
R274 47 k
R276 47 k
0 V 0 V
R278 47 k
• DUD
R280 47 k
4.8 V
R282 47 k
R284 47 k
0 V
R286 47 k
R288 47 k
• IC101-8pin • IC101-4pin
R290 47 k
R292 47 k
4.3 V
2.4 V 1.5 V
0 V 102 ns 0 V
L1
L2
O
CO2
STB
NT
SPS
PST
BSY
RES
Power on: 0 V
Power on: 4.8 V
Q421
Power off: 0 V Power off: 4.9 V
DTA144EU
PWRS PWRS
R421 R422
R423 470 100 k
10 k
PWRC
PWRC
4.8 V
R401
R399
33 k
10 k
0 V
5.2 V D401
R395
1SS355
470 k
6
R396
C392 R394
4.9 V R397
220 k
0.22 1 k C395
220 k
0.1
Q391
1
D393
2SC4116 BL R393
1SS355
47 k 5
1
H5VL 4
2
4.8 V
IC391
5VL
3
S-80942ANMP-DD6
14V R398
100 k
1 CD 5
R392 56 k OUT
HV 2
VDD
3 NC 4
VSS
IC392
B5V
TC7S08F
13.8 V
D382
C394 5.2 V
MA729 R391 C393
D381
22 P
39 k 0.22
MA8051 M
R381
R382
1 k
47 k
Power on: 4.8 V
Power off: 3.0 V
DISPLAY BOARD
1 ms
(2 ms) • COM0
4.8 V
3.2 V
1.6 V
1.1 V
0 V
8 ms
• M • DO(Variational follow the display)
4.8 V 4.8 V
2.6 V
0 V 0 V
2 ms
30.5 µs
1.3 V
2.8 V
4.8 V
H5VL H5VL
1 16
M M
2 15
DO DO
3 14 • CL1
CL2 CL2
4 13
CL1 CL1 4.8 V
5 12
V3 V3
6 11
V2 V2
7 10
V1 V1
8 9
COM1 COM1
9 8
0 V
COM2 COM2
10 7
COM3 COM3
11 6
COM4 COM4
12 5
GND GND
13 4
DIMV DIMV
14 3
GND GND
15 2
• CL2
14V 14V
16 1
4.8 V
0 V
13.6 V
H5VL
R405
100 k DS81 DS71
4.8 V
TLYE1002 TLYE1002
R402
6.8 k
14
2 1 ETXD
DS82 DS72
TLYE1002 TLYE1002
7
IC401A
C401
5 4
TC74HC04AF
0.1
Q401
DS83 DS73
XP4601 TLYE1002 TLYE1002
R404 IC401B *8.0 V
2 3
15 k
TC74HC04AF
Q81
ERXD *4.8 V
3 4
2SC4116 BL
R403
*4.2 V
100 k 4.8 V
W401
R81
R82 R72
220 330 220
*: BK LIGHT=10
25 µs
H5VL
50
NC
Pals 14µs 49
NC
48
C101 NC
47
0.1
NC
46
VCC
45
NC
M 44
M
43
NC
42
DO
2 ms
DO 41
DI IC101
CL2 40
CL2
HD66100F
39
SHL
38
NC
CL1 37
CL1
36
GND
V2 35
V4
V3 34
V3
33
V2
V1 32
V1
31
VEE
32 µs
DS61 DS51 DS41 DS31 DS21
TLYE1002 TLYE1002 TLYE1002 TLYE1002 TLYE1002
DS62 DS52 DS42 DS32 DS22
TLYE1002 TLYE1002 TLYE1002 TLYE1002 TLYE1002
DS63 DS53 DS43 DS33 DS23
TLYE1002 TLYE1002 TLYE1002 TLYE1002 TLYE1002
Q31
Q71 Q61 Q51 Q41
2SC4116 BL 2SC4116 BL
2SC4116 BL 2SC4116 BL 2SC4116 BL
R71 R62 R61 R52 R51 R42 R41 R32 R31 R22
330 220 330 220 330 220 330 220 330 220
DS101
HLC7395-012400
81
Y50
82
Y49
83
Y48
84
Y47
85
Y46
86 SE1
Y45
87 SE2
Y44
88 SE3
Y43
89 SE4
Y42
90 SE5
Y41
91 SE6
Y40
92 SE7
Y39
93 SE8
Y38
94 SE9
Y37
95 SE10
Y36
96 SE11
Y35
97 SE12
Y34
98 SE13
Y33
99 SE14
Y32
Y31 100 SE15
14V
DS11
TLYE1002
DS12
TLYE1002
DS13
TLYE1002
Q21 Q11
2SC4116 BL 2SC4116 BL
R21 R12 R11
330 220 330
COMPLETE VIEW RIGHT SIDE