![background image](http://html2.mh-extra.com/html/icom/ic-f1610/ic-f1610_service-manual_4199056036.webp)
AF BUS
OPT AF BUS
AFO
PAMIC
SPE
SP
BEEP
PAAF
VCC2
1
IN+
2
IN-
3
OUT
4
VCAIN
7
CTL
8
VCAOUT
9
VCC
10
GND
5
NC
6
IC7
M5282FP
R320
100k
R338
56k
C83
0.1
C92
0.1
C95
0.1
R94
10k
C93
220
C94 470
1
2
3
4
5
IC8
VCC
LA4425A
R330
10k
C369
0.001
R86
10k
D50
1SS355
Q7
DTC363EK
C91
0.0047
C333
2.2
C98
2.2
R93
2.7k
R90
100k
R92
82k
C100
390p
C316 0.1
C318
0.01
R339
27k
C330
0.1
R349
10k
C86
0.1
R81
10k
C413
0.0047
C101
0.01
5
6
7
IC9b
TA75W558FU
C326
470p
R89
22k
R88
10k
R80
22k
R595
10k
C371
0.001
AFO
R87
10k
R85
47
1
3
4
5
2
IC2
TA75S558F
5
6
7
IC3b
R52
2.2k
C72
2.2
C90
10
6
5
4
3
2
1
Q503
XP4601
R508
10k
R509
10k
C506
0.1
R510
1k
R515
39k
R512
3.9k
R511
180k
R357
470k
C84
2.2
R70
470k
C97
0.001
C332
2.2
R69
47k
R68
22k
C73
0.1
C74
0.1
Q6
DTC114EU
C75
1
R71
10k
R77
33k
Q515
DTA144EU
R569
1k
3
2
1
4
8
IC3a
TA75W558FU
C70
0.047
R61
100
R62 1.5k
R65
47k
C71
0.047
R63
91k
C314
100
R327
100k
R67
10k
Q5
2SC4116
C68
0.047
R53
36k
C508
10
C509
0.1
C61
2.2
R8
L56
1
L60
1
C502
0.1
D502
DAN202U
R502
15k
C67
0.047
C69
0.047
R51
4.12k
R49
1
R42
100
C60
1
R313
270k
C343
0.001
L50
0.56
R41
100
3
1
2
FI4
SFPC455E
3
1 2
FI3
SFPC455H
D501
DAN202U
W503
R505
12k
R501
10k
R504
12k
R503
12k
Q510
DTC144EU
W502
C49
0.01
C48
2.2
R506
15k
Q501
DTC144EU
Q502
DTA144EU
R33
1.5k
X1
CR-574
C50
0.001
C51 68p
R34 4.7k
C52
120p
C57
0.1
R38
1.8k
C58 0.1
R39
47k
X2
CDBC455CX16
R543
680
R40
1k
C59
68p
NWC
C319
0.001
C295
0.001
C41
15p
C46
0.001
CRYSTAL
1
CRYSTAL
2
MIXER
3
VCC
4
LIMIT
5
DECOUP
6
LIMIT
7
QUAD
8
AUDIO
9
FILTER
10
FILTER
11
SQUELCH
12
METER
13
MUTE
14
GND
15
MIXER
16
IC1
MC3372SVM
C423 0.001
R408
47k
R407
47k
Q61
2SC4116
R36
1k
R35
82k
C56
0.001
C66
0.001
C62
150p
C63
150p
C64
0.001
Q62
DTC144EU
R410
2.2k
L19
1.2
C54
47p
L55
1
C53
0.001
C55
0.001
R37
470k
FI1A
FL-264
FI1B
FL-264
R46
TN20-3K202L
R47 2.7k
R48
820
C65
0.001
Q2
3SK166
C337
47p
C39
0.001
L16
0.15
Q4
2SC4215
R588
820
R30
180
R32
6.8k
R29
560
R385
820
R21
56
R409
1.5k
C296
10p
L15
4.7
L52
0.56
R403
4.7
D511
1SS375
R18
220k
C26
470p
R17
220k
C305
1p
C31
2p
C34
2p
C32
30p
L54
0.56
R19
100k
L10
0.56
R328
470
C306
1p
R20
100k
C40
8p
C329
0.001
C37
30p
L13
MC152
L12
MC152
C33
6p
D11
1SV217
D10
1SV217
R16
220k
C27
6p
L11
MC152
C341
0.001
C408
470p
C327
0.001
R13
100k
C30
27p
Q1
3SK166
C29
470p
D9
1SV217
C28
0.001
R14
47k
R12
22k
C20
3p
C328
0.001
R365
10
C36
6p
C35
3p
R15
150
C23
0.001
C331
0.001
R10
220k
C18
15p
D52 1SS352
C19
3p
C325
0.001
C565
0.001
REV
FOR
L6
LW-25
C4
470p
R4
47
C2
15p
R2
1
C10
18p
D3
1SS375
D1
1SS375
C17
22p
C3
33p
R8
220
C14
4.7
C15
15p
C16
18p
HC373
1p
R7
220
D4
UM9401F
C11
47p
C9
6p
C8
33p
C415
15p
C7
470p
R5
1
C324
27p
C416
0.5p
R1
47
C13
470p
C6
0.001
C300
0.001
R315
100
R314
100
C5
0.001
D7
1SV217
C22
27p
C21
2p
L8
MC152
D5
MI809
D6
MI809
L4
656LZ-09K
L5
656LZ-09K
L507
LA-515
L7
LA-504
L3
LA-503
L2
LA-504
L1
LA-504
R415
100k
ANTENNA
W6
+5V
PSET
+18V
T8V
+8V
R102
4.7k
C118
0.001
C396
47p
C399
470p
R98 100
C119
22
W11
W12
W13
W14
W15
W16
W17
W18
W19
W21
W22
W23
W24
W25
W26
W27
W28
W29
C122
0.001
C400
47p
C401
470p
C420
0.22
C308
0.22
Q11
2SJ377
C397
470p
C107
1.5
C398
0.001
C112
1
EP3
EP3
T8V
+5V
PSET
+18V
L30
0.56
C339
1
MT8V
C136
470p
R371
4.7k
Q55
2SC4081
R31
4.7k
L18
3.3
C294
0.001
D18
MA77
C47
9p
C43
0.001
R27
3.3k
R26
220
R366
100
C45
0.001
R28
2.2k
R25
270
C44
0.001
Q3
2SC5110
L26
0.56
C410
22
R108
4.7
C370
0.001
C411
22
L17
56n
C338
33p
C42
33p
IC11
SC-1188
L508
56n
C561
39p
NOISE
NWC
C156
47p
R131
220
C154
10
C322
47p
C311
7p
5
1
8
0.001
2
C114YU
Q27
DTA144EU
L33
82n
C152
470p
C148
0.001
R125
680
C151
10p
L51
47n
C149
18p
C312
18p
Q18
2SC5110
C310
18p
R127
470
R587
6.8k
R126
6.8k
R132
10k
C153
0.001
Q19
2SC5110
R586
6.8k
R133
470
C562
0.1
Q517
DTC144EU
W508
R44
22k
C503
0.01
C504
0.01
R45
82k
C315
120p
RSSI
1/2 VDD
R514
1k
C334
2.2
R513
56k
C507
0.022
C510
0.01
R95
100k
Q8
DTC114EU
R359
10k
R360
10k
PASP
1/2VDD
ACC I/O BUS
DTMF BUS
AF BUS
VRX
VTX
COM BUS
R128
10
C161
47p
C160
0.001
L31
47n
C323
0.001
Q24
DTC114YU
Q28
DTA144EU
C162
0.001
L32
82n
C145
470p
C146
27p
R129
8.2k
C150
10p
R370
8.2k
Q20
2SC5110
R130
470
C147
0.001
C143
27p
R124
270
R122
18
R123
270
C144
27p
R594
4.7k
T8V
L5V
CPU5V
BOOT
C132
22p
L24
47n
L23
47n
R110
560
R312
4.7k
R121
5.6k
C131
0.001
D16
DA221
C129
33p
C138
15p
R559
100k
R560
1k
C549
0.01
D508
DA204U
R545
100k
R546
1k
C54
0.01
D510
DA204U
C297
0.001
D17
MA77
R119
4.7k
C139
0.001
L29
3.3
C140
0.001
C141
10p
R120
8.2k
R114
22
R118
470
C142
0.001
R117
1.8k
R116
150
Q16
2SC5110
C134
0.001
R331
470
C137
0.001
C135
470p
R113
22
L27
82n
R115
3.9k
R109
2.2k
Q15
2SC4703
Q17
2SC5110
R386
22
R111
22
C133
0.001
L25
68n
C130
0.001
R340
150
C128
12p
C127
27p
C126
12p
OPS2
OPS1
VCC
C106
0.001
R97
10k
R100
10k
C387
47p
C388
470p
C381
47p
C382
470p
C383
0.001
C123
47p
C124
22
C125
47p
C384
47p
C385
470p
C386
0.001
C376
470p
C377
0.001
C378
47p
C379
470p
C380
0.001
C390
470p
C389
0.001
C391
47p
C392
470p
C393
47p
C395
0.001
C117
0.01
R96 10k
C108
0.001
C121
0.001
IC17
AN78L05M
R101
1.2M
C115
D15
DSA3A1
470
3
2
1
4
8
IC10a
NJM2904
D44
HSU88
R103
4.7k
5
6
7
IC10b
NJM2904
R99
4.7k
C409
47p
R329
1k
D45
1SS355
R361
4.7k
Q12
2SJ377
R333
10k
C394
470p
R107
470
Q14
DTC144EU
D509
DAN202U
C116
470p
IC16
TA7808F
D15
DSA3A1
R363
10k
R362
10k
PWON
W4
OPC-453
VTX
VRX
+8V
R8V
+5V
T8V
CPU5V
+18V
C208
1
L45
4.7
C266
0.1
R260
100
C211
1
C204
1
C205
0.1
C203
0.1
R567
4.7k
R568
4.7k
C206
220
R209
4.7k
R208
4.7k
Q36
2SD1664
Q37
2SC4116
C207
10
R564
47k
R563
47k
D27
DA204U
R213
4.7k
R212
4.7k
Q40
2SD1664
Q41
2SC4116
D29
DA204U
C406
470p
C407
470p
R566
47k
R565
47k
Q38
2SD1664
C267
10
C264
0.1
Q42
2SB1123
L504
3.3
Q43
2SC4081
C252
0.001
R259
4.7k
C253
10
D30
1SS355
R550
47k
R540
5.9k
C537
0.1
IC506
S-81250PG
Q508
2SK1829
C536
0.1
C538
0.1
C535
0.1
R541
8.25k
C257
1
D31 1SS355
L53
SLF7032-101MR45-2
+5
RXD
CTS
GND
GND
VCC
BOOT
RES
RTS
TXD
FVPX
D32
DA204U
R553 100k
R554
100k
C529
47p
C531
47p
C528
47p
C530
47p
Q509
DTC144EU
Q513
DTA144EU
Q511
DTA144EU
R547
1k
R548
47k
D506
DAN202U
Q512
2SC4081
R542
10k
R549
47k
Q44
2SK1069
R263
10k
C544
0.1
1
2
3
4
5
6
7
8
9
10
J501
52365-1091
C533
47p
C534
47p
C532 47p
R584 100k
R585
100k
TMUT
DSTB
DCK
DDA
PLLT
HFSW
PA
FVPP
MD1
UNLK
XRXD
XCTS
VRX
PWON
VTX
PCK
PDA
PSTB
R538
1k
R273
1k
R272
1k
R275
1k
R276
1k
R277
1k
SP
PASP
DIM
EPTT
P14/A4
75
P42/TMRI0
51
P43/TMCI/HIRQ11
52
P44/TMO1/HIRQ1
53
P45/TMRI1/HIRQ1
54
P46/PW0
55
P47/PW1
56
PB7/XDB7
57
PB6/XDB6
58
VCC
59
P27/A15
60
P26/A14
61
P25/A13
62
P24/A12
63
P23/A11
64
P22/A10
65
P21/A9
66
P20/A8
67
PB5/XDB5
68
PB4/XDB4
69
VSS
70
VSS
71
P17/A7
72
P16/A6
73
P15/A5
74
IC20
HD64F3437F16
W504
R571
1k
R558
1M
R278
100k
R305
100k
R142
33k
C352
0.001
C521
10
C522
0.001
C551
0.001
R556
100k
W505
Q504
2SK1069
R218
1k
C547
0.001
C552
0.001
C550
0.001
R528
1M
R519
1k
R555
300k
C525
0.1
R577
1k
R529
390K
ECS1
ECS2
ECK
ESI
W507
R570
1k
L5V
1
2
3
4
6
5
7
8
IC18
TC7W04FU
C263
1
R262 47k
C1
4
C2
5
VSS
7
NC
8
C3
6
VDD
1
XMIT
2
NC
3
OSC1
9
OSC0
10
C4
11
MUTE
12
NC
13
R4
14
R3
15
R2
16
R1
17
NC
18
CD
19
TONE
20
IC501
LC7366NM
C262
1
C261 0.001
C259
0.68
D33
MA8160
C258
1
R261
470k
C260
100p
C368
15
R552
1k
C542
0.1
C543
10
C554
20p
C553
20p
X502
PBRC3.58A
R306
100k
R143
10k
L59
1
MCON
ESO
DTC1
DTC2
DTC3
DTC4
DTR1
DTR2
DTR3
DTR4
DTMF
EPTT
AMUT
MODS
BEEP
NWC
DIM
HORN
GND
GND
VCC
DISC
GND
GND
PTT
IN
PAAF
DIM
HORN
VCC
DISC
PTT
GND
GND
GND
GND
IN
PAAF
C254
10
D51
1SS355
C358 0.1
R372
1k
R210
4.7k
R211
4.7k
C210
1
Q39
DTC114YU
Q514
DTA144EU
D28
DA204U
R406
33k
C209
4.7
C402
470p
C403
470p
C404
0.001
J4
R398 100k
R525
100
C518
10
C519
10
C421
10
R402
1k
Q506
2SK1069
R397
100k
C361
0.001
C359
0.001
C357
0.001
R373
10k
C256
0.1
C255
1
R267
100k
Q47
DTC144EU
Q45
DTC144EU
C360
1
R524
100k
R526
100k
R527
100k
C520
0.1
1
2
3
4
6
5
7
8
IC504
TC4W53FU
DIM
HORN
C405
47p
TMUT
VCC
+8V
AMOD
DMOD
PAAF
1/2VDD
L5V
DISC
VCC
+8V
DISC
DMOD
AMOD
PAAF
1/2VDD
VRX
R8
b
PAOUT
DTC1
HORN
OPS1
OPS2
DTC2
DTC3
DTC4
DTR4
DTR3
DTR2
DTR1
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
P83/IOR
P82/CS1
P81/GA20
P80/HA0
VSS
PB0/XDB1
PB1/XDB7
P37/HDB7/D7 P36/HDB6/D6
P35/HDB5/D5 P34/HDB4/D4
P33/HDB3/D3
P32/HDB2/D2
P31/HDB1/D1
P30/HDB0/D0
PB2/XDB2
PB3/XDB3
P10/A0
P11/A1
P12/A2
P13/A3
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
AVcc
AVcc
AFV
BATV
RSSI
THRM
CDEC
CENC
35
34
33
32
31
30
TMO0/P41
TMCI0/P40
KEYIN8/PA0
KEYIN9/PA1
AVSS
DA1/AN7/P77
DA0/AN6/P76
AN5/P75
AN4/P74
AN3/P73
AN2/P72
AN1/P71
AN0/P70
AVCC
AVREF
IRQ7/KEYIN7/P67
IRQ6/KEYIN6/P66
FTID/KEYIN5/P65
FTIC/KEYIN4/P64
KEYIN10/PA2
KEYIN11/PA3
DATA BUS
REG SW BUS
AF BUS
ACC I/O BUS
IN
VCC2
OUT
VCCA
O
I
G
O
I
G
I
O
G
VCC
L5V
HV
+8V
+18V
+5V
VCC
MODS
+8V
VCC
TMUT
+18V
T8V
+5V
+8V
VCC
MT8V
PSET
PDET
+18V
T8V
+5V
+8V
VCC
SP
AMUT
CDEC
HFSW
AFOUT
DISC
R8V
b
VRX
NOISE
T8V
R8
HV
PDET
a
TUNE
PAOUT
T8V
PDET
HV
XTXD
XRTS
RES
FVPC
RSSI
CENC
R:4.23V
T:4.35V
R:0V
T:1.55V
R:8.22V
T:8.84V
R:1.39V
T:0V
R:2.59V
T:0V
R:8.11V
T:0V
R:7.96V
T:0V
R:0.73V
T:0V
W:6.92V
N:7.04V
W:2.6V
N:2.16V
W:0V
N:2.67V
W:0V
N:2.66V
W:6.28V
N:6.40V
W:2.48V
N:2.15V
W:13.00V
N:0V
2.49V
2.53V
0V
3.38V
2.73V
1.73V
4.39V
2.57V
R:4.99V
T:0.98V
R:0V
T:1.79V
R:0.96V
T:4.89V
2.68V
7.04V
1.80V
3.24V
2.98V
6.95V
1.98V
4.23V
R:2.76V
T:0V
R:4.44V
T:0V
R:2.10V
T:0V
R:0V
T:4.47V
R:0V
T:3.16V
R:0V
T:2.65V
R:0V
T:1.49V
R:0V
T:8.51V
R:0V
T:1.86V
R:0V
T:2.24V
R:0V
T:9.51V
R:7.16V
T:0V
R:0V
T:0.43V
R:0V
T:1.36V
R:0V
T:9.09V
R:13.10V
T:12.27V
R:0V
T:1.86V
R:12.42V
T:8.22V
R:2.89V
T:2.84V
R:0.23V
T:2.83V
R:13.13V
T:12.33V
0.63V
13.2V
0.85V
R:8.18V
T:0V
R:0V
T:7.96V
5.04V
R:8.78V
T:0.10V
R:0V
T:8.79V
0.59V
MEASUREMENT CONDITIONS
OSCILLOSCOPE:20MHz
VOLTMETER :1 /V
5.05V
2.44V
16.39V
17.21V
2.29V
20.86V
10.97V
4.99V
5.10V
5.08V
12.59V
4.57V
7.67V
0V
3.71V
5.10V
5.10V
R:0.66V
T:0.49V
R:0.48V
T:0.63V
R:5.09V
T:0V
R:0V
T:8.61V
8.02V
7.71V
7.00V
2.11V
R:6.30V
T:6.23V
2.59V
7.43V
4.00V
4.13V
1.22V
6.11V
4.12V
2.58V
SQL OPEN 0V
SQL CLOSE 4.61V
(SP MODE)
3.10V
2.54V
2.54V
4.81V
SQL OPEN 4.88V
SQL CLOSE 0V
SQL OPEN 0.89V
SQL CLOSE 4.60V
SQL OPEN 0V
SQL CLOSE 4.26V
2.52V
0.50V
2.55V
2.54V
1.10V
W:4.92V
N:0V
W:4.38V
N:0V
W:0V
N:7.26V
W:3.12V
N:0V
7.2V
R:7.25V
T:0V
1.73V
W:7.17V
N:0V
W:4.24V
N:4.32V
W:3.0V
N:3.3V
W:0.62V
N:0V
W:0.62V
N:0V
0.97V(+15dB INPUT:3.40V)
R:0.73V
T:0V
R:0V
T:0.76V
0V
0V
0.69V
0V