Table of Contents
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• MAIN-A UNIT
(BOTTOM VIEW)
R472
R473
R474
R471
IC53
R456
-RES
C451
D52
R432
R461
R460
R434
R462
C356
-REF
C429
IC52
Q73
MOD-
C378
+5V
S5V-
R390
-VREF
DISC-
SDEC-
MMUT-
-EPTT
-ATX
C385
R430
D53
MC51
-CL
R146
C236
C235
R147
D33
D31
PWON
R155
D34
C261
C423
Q27
C264
R158
R139
C243
C240
R138
C266
R152
NWC
R431
C242
R140
Q19
R141
R143
C241
R142
-SQIN
C93
R71
+5V
LVA
R72
C123
R51
C118
Q12
-R5V
R52
L47
Q9
C147
R132
C224
C72
D6
R35
C206
Q15
D5
C63
R32
R30
-TEMP
IC60
C65
R34
C59
R33
C64
C61
C62
L9
C53
C340
R359
R31
C54
R366
R360
C60
R363
C336
IC60
-VCON
C343
Q58
C342
S53
R429
R428
S53
[LOWER KEY] [UPPER KEY]
J52
J51
EP51
C334
C391
R408
R128
C226
C231
C227
C393
R126
R127
R125
C225
C228
C233
R412
R418
Q64
Q63
R416
-RSSI
R414
C220
D21
R102
D55
R101
R103
R123
C218
C197
L14
C192
C194
R105
D28
D26
C180
C184
C179
R112
C189
R110
C183
C177
C203
D24
C176
C201
R159
C182
L13
T1-
R156
R104
D22
S5V
R6
C172
C171
C38
D3
Q2
C39
L6
L48
C45
C13
C12
L8
R29
MP5
C52
APCV
TMUT-
PDET-
S52
C388
S52
[PTT SWITCH]
The combination of top side and bottom side of this
R406
[VOLUME CONTROL]
IC55
C404
PWON
C401
[ROTARY SELECTOR]
C9
C8
C5
L3
R5
C6
R4
R2
R3
C3
L1
R1
8 - 2
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Table of Contents
Need help?
Do you have a question about the IC-F4001 and is the answer not in the manual?
Questions and answers
ptt pressed but not tx
The Icom IC-F4001 may not be transmitting when the PTT is pressed due to several possible reasons:
1. Transmit Inhibit Function – Transmission is restricted if:
- The channel is muted (PMR operation only).
- The channel is busy.
- A signal with an unmatched (or matched) CTCSS or DTCS tone is received.
- The selected channel is a "receive only" channel.
2. Time-Out Timer – If the transceiver has been transmitting continuously beyond the pre-programmed time limit, the time-out timer activates and stops further transmission.
3. Penalty Timer – After the time-out timer activates, the penalty timer may further inhibit transmission for a set period.
4. Power Supply Issues – If the transceiver is connected to a power supply with incorrect voltage or reversed polarity, it may not function properly.
5. Antenna Damage – If an RF signal stronger than 20 dBm (100 mW) was applied to the antenna connector, the transceiver’s front-end could be damaged, affecting transmission.
Checking these factors can help identify and resolve the issue.
This answer is automatically generated
Q73 trasistor does not work when PTT pressed but software is ok