Icom IC-F620 Service Manual page 34

MAIN UNIT (2)
BUS LINE1
8V
8V
5V
5V
VCC
VCC
T8V
T8V
R8V
R8V
ANT
ANT
R111 R112 C165
22k 10k 0.001
DET
B
C166
0.001
C167 C168
0.027 0.039
DISC
2.5V
R244
C316
390k
820p
R246 Q20
R240 R242 R243
2SC4213
9 1.5k
100k 39k 82k - 8
10
+
IC21c
NJM12902V
FSW
Q43
DTC144EU
LINH
IC19
LC73872M
MICI 1 14
INPUT VDD
2 13
R319 C310 NC NC
3 12
47k 0.1
PO EST
4 11
OSCO STD
5 10
16mVrmS
OSCI ACK
6 9
NC SD
7 8
VSS LOADB
5V
R216 33k
MAIN
R215 3.9k
C278 0.1
UNIT
IC6
(1) R217 C283 R231
M62364FP
27k 0.001 1k
BEPO 1 24
VIN1 VIN8
2 23
R218 C360 VOUT1 VOUT8
3 22
27k 0.1 VOUT2 VOUT7
BEEP 4 21
VIN2 VIN7
5 20
VDD GND
DAST 6 19
LD RESET
SCK 7 18
CLK VDAREF
SO 8 17
DI DO
MICI 9 16
VIN3 VIN6
10 15
VOUT3 VOUT6
CTCS 11 14
VOUT4 VOUT5
TENC 12 13
VIN4 VIN5 R220
56k
C280
4.7
VAG
SQIN
TX:0.5V
R256 100k
5V RX:1.1V
C321 0.1
8
V+
R247 R248 R249
22k 22k 22k GND
DET 5
+ 7 4 IC5
6
NJM12904V
IC5 -
NJM12904V
5V
C324
IC7
0.1
M62334FP
T1 1 8
AO1 VCC
T2 2 7
AO2 SCL
T3 3 6
AO3 SDA
T4 4 5
AO4 GND
TONE
R265
39k
SCK
OSDA
5V
1.7Vp-p
R267 22k
C328 R262
(2/5 TONE) CENC2
1 33k
Q36
R268 56k
2SC4116
CENC1
R261
33k
R269 180k
CENC0
R286 1k
BUS LINE2
ANT
8V
5V
VCC
T8V
R8V
R116 R117 C170
1.5k 5.6k 0.033
IC21b
C169
NJM12902V
0.039
5
+ 7
6
-
C186 R126 C183 C173
0.0022 22k 0.047 4.7
C187 C179
0.0022 470p
R127
22k
A
R128
Q21
47k
2SC4116
C188
C181 0.1
0.1
C174 0.1
C180 0.1
5V
APST
4.1Vp-p
(3.579MHz)
IC23
HN58X24128FPI
8 1
VCC A0
R282
7 2
100k WP A1
6 3
SCL A2
5 4
SDA VSS
R281 10k
C362 0.1 R304 56k
C386 0.1 R318 12k
5V
IC24
S-80942ANMP-DD6
5 1
CD OUT
2
VDD
R288
DET 4 3
NC VSS 10k
Q50
MOD DTC144EU
MD1
Q49
Q41
DTC144EU
DTA144EU
BAL
D28
REF
DAN222
IC25
5 4 TC4S66F PWR TEMP
1 2 AFVI
3 PWON
PA EPTT
CDEC
RES
IC22
R277
5 4 TC4S66F
12k
1 2
2.9Vp-P
R257
3
(19.66MHz)
470k
IC5
R253 R254 D27 C339 X4
NJM12904V
18k 47k MA77 27p CR-520
2 CLO
- 1
3 CLI
+
CSFT
R255
1.8V DUSE
47k
Q35
XP1214
XCTS
4 3 XRTS
2
5 1 DUSE
5V
R270 R271
47k 47k 47k
5V
Q37
2SC4116
R273 R275
4.7k 27k
Q38 4.9V
C335
DTC144EU (DTCS)
0.047
C337
0.47
0.6Vp-p
(CTCSS)
L36
4.7µ
R130 27k R131 68k
C190
R230 10k R129 470k 100p
R179
33k
C189 0.1
R132
R133
56k
220k
R180
5.6k
C192
0.0047
12 44
MICIN EXPIN
13 43
MICGS EXPGS
R134
14 42 C195 0.1
CALO ECHG 150k
15 41 C193 0.1
ALCO EXPO
16 40
CMPIN PWRIN
17 39 5 6
IC14
CCHG PWRGS
18 TC35453F 38 R136 1k
CMPO PWRON C194
19 37
120p
TXFI PWROP
20 36
VDDA MSKST
21 35
VDDD VSSA C196 R135
22 34
0.01 100k
STB VSSD
4 3
IC15
X3 TC4W53FU
CR-563
R298
100k
R147
100k
C200 0.1
C201 0.1
R322
C202 0.1
100k
51
P41/AN1 PK0/SEG9
52
P40/AN0 PK1/SEG10
53
VREF PK2/SEG11
54
AVCC PK3/SEG12
55
PH7/TONED/TMCI4 PK4/SEG13
56
MD1 PK5/SEG14
57
OSC2 PK6/SEG15
58
OSC1 PK7/SEG16
59
RES PL0/SEG17
60
NMI PL1/SEG18
61
STBY PL2/SEG19
62
VCC VSS
63 IC20
XTAL PL3/SEG20
64 HD64F2268TF
VSS CVCC
65
EXTAL PL4/SEG21
66
FWE PL5/SEG22
67
MD2 P71/TMRI23/TMCI23 PL6/SEG23
68
P77/TXD2 P70/TMRI01/TMCI01 PL7/SEG24
69
P76/RXD2 PM0/SEG25
70
P75/TMD3/SCK2 PM1/SEG26
71
P74/TMO2 PM2/SEG27
72
P73/TMO1 PM3/SEG28
73
P72/TMO0 PM4/SEG29
74
PM5/SEG30
75
PM6/SEG31
ANT
8V
5V
VCC
T8V
Q22
R8V DTC144EU 4
CPU5 V+
GND
11 IC21
NJM12902V
IC21d
R182 R181 R185
NJM12902V
68k 68k 33k
12
14 +
13
-
AFON
AFONO
CPU5V
D31
Q40
R287 DAN222
R194
DTC144EU
10k
2.2k
C249
470p
7 8
Q39
DTC363EK
R193
100k
R195 C251 C253
5
1 1k 0.1 0.1
4 1
3
2
2
2 1 IC18
TA75S01F
C252
0.1
R159 C359
10k 0.1
TX:8.0V
RX:0V
AFO
D23
DA221 Q25
2SD1664
Q29
DTC144EU
TMUT
TX:0V
R239 4.7k
RX:8.0V
D24
Q28
DA221 Q26
XP6501
2SD1664
Q30
DTC144EU
TXC
R150 100k
CPU5V
VCC
DET
Q33
DTC144EU
25 CCS
24 SCK
23 SI SIGOUT
22 SO
Q32
21 DDAC E DTC144EU
20 DDSD SIG
19 NWC
18 AFON D
F
17 TMUT MOD
R225 10k
16 TXC
Q31
15 PLRS
2SJ144 R224 47
14
13 PLST
R223 1k
12
11 LSO
10 LCK
R226
9 LCS
100k
8 LINH 5V
7 PGI1
D26
6 PGI2
MA2S111
5 PGI3
4 PGO1 HV
3 PGO2 VOC
13.1V
2 DAST
IC9
Q23
1 OSDA 8.0V TA7808F
2SJ377
8V
O I
G
IC10
AN78L05M
CPU5
O I
G
5.0V
Q24
DTC144EU
PWR
MEASUREMENT CONDITIONS
4.5V
VOLTMETER
(PWR ON)
Amplitude(Oscilloscope):100MHz
Frequency:440MHz
Transmission:25W
11 - 3
CHASSIS
J1
ANT
VCC
IC21a
NJM12902V
3
1 +
2
- R190
4.7
5.0V
(AFON)
IC8
LA4425A
C256
5
470
4
3
J4
J5 P1
G H
+
-
CHASSIS
5V
SP1
VCC
C273
5.0V
0.001
C274 Q27
4.7 2SB1132
6 5 4
1 2 3
VCC
PA
Q48
DTC144EU
J6
VCC
DIM
HORN
GND
PAAF
GND to
C288 0.1
DISC OPC-617
GND
C289 0.1
IN
GND
PTT
HV
EP3
EP3 W2
HV