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SECTION 10.
VOLTAGE DIAGRAM
MAIN-A UNIT (1/2)
R301
C301
DISC
0.1
15k
C TCSS/DTCS FILTER
S5V
R310
DISC
R351
22k
18k
C329
0.0047
R355
IC59
C328
6
C330
C331
B
7
1
10k
5
0.01
0.01
LM2902PWR
VREF
+5V
+5V
RMUT 1
J51
R361
470
MMZ1005Y102CT
R366
R368
R369
150k
270k
150k
MC51
R359
8.2k
EM9745P
R363
470
Q58
UNR911HG0
SW-149
Q59
LDTC144EE
IPTT
KEY1
KEY2
CL
8
VO-
7
GND
SHUTDOWN
6
C393
SE/BTL
5
VO+
BYPASS
220
J52
TPA0211DGN
J53
1
2
F51
CP5
R421
CP06S
12
ERBSE3R00U
S54
TP76N00N
2
1
C1
A1
3
B1
5
4
C2
A2
6
B2
8
7
C3
A3
9
B3
TP70TF5169
*: Refer to the PARTS LIST for the value and name of component.
R303
56k
IC60
R302
6
1.5k
B
7
SDEC
12k
5
R304
NJM12902V
VREF
R314
R313
390k
C304
10
3.3k
C307
0.1
R321
4
3
S5V
R311
R312
15k
5
2
R316
R322
22k
22k
CENC0
1
6
470
180k
R323
Q51
CENC1
R317
R318
XP4601
CDEC
56k
6.8k
10k
R324
R326
CENC2
C333
22k
47k
0.0047
NJM12902V
C332
IC58
6
B
7
0.0047
5
IC62
DUS E
14
1
VDD
I/O1
13
2
CONT1
O /I1
12
3
CONT4
O /I2
11
4
I /O4
I/O 2
10
5
M MUT
O/I4
CONT2
9
6
O/I3
CONT3
R341
8
7
SENC
I /O3
VSS
68k
CD4066BPWR
C380
47P
C347
RX
R370
0.01
470k
IC60
IC58
C346
C348
2
9
A
1
C
8
0.039
0.039
R375
C349
3
10
0.1
NJM12902V
470
NJM12902V
VREF
VREF
VREF
R428
R429
1.5k
390k
9
IC60
D53
C
8
VOXV
NJM12902V
C381
C382
10
S5V
IC58
L1SS400
0.018
0.018
NJM12902V
GND
11
S5C
CPU5
CPU5
EPTT
EPTT
ATX
ATX
R5V
Q84
Q85
R440
LDTC144EE
LDTC144EE
AFON
390
R5C
R441
+5V
10k
IPTT
T5V
KEY1
KEY2
CL
T5C
R412
C403
IC55
AFO
1
IN
0.1
4.7k
2
R413
100k
AFON
3
+5V
VDD
4
Q63
2SB1132
VCC
R442
D55
Q74
330
L1SS400
XP6501
R414
BATV
330k
Q64
Q75
+5V
HV
AFVI
Q76
PWON
CBI0
LDTC144EE
CBI3
CBI2
CBI1
10 - 1
IC59
2
R329
C356
A
1
R327
R328
3
4.7k
10
47k
47k
LM2902PWR
Q52
LDTC144EE
IC59
IC59
13
9
D
14
C
8
R342
R343
R344
R345
12
10
68k
68k
68k
68k
LM2902PWR
LM2902PWR
R374
3.9k
IC56
1
14
I/O1
VDD
2
13
R377
O /I1
CONT1
3
12
R379
O /I2
CONT4
4
11
33k
I/O2
I /O4
5
10
C350
CONT2
O/I4
270k
6
9
CONT3
O/I3
7
8
0.0012
VSS
I /O3
IC58
13
CD4066BPWR
D
14
12
NJM12902V
LM2902PWR
Q71
KTA2015
IC59
4
4
V+
V+
GND
11
R432
4.7k
2SA1586
Q72
R434
10k
KTA2015
Q73
R436
4.7k
NJM12902V
IC60
CDEC
4
STONE
V+
RES
GND
11
IC53
1
5
CPU5
CD
VDD
2
VSS
3
4
MR
VOUT
2SB1132
NJU7704F3
R456
10k
R451
10
CR-864
R454
C453
X51
22P
22k
XP6501
IC54
1
5
CTRL
VIN
R455
2
GND
3
4
NB
VOUT
12k
NJM2871BF05
CPU5
CP05S
CP6
CP05S
CP7
CP05S
CP8
CP05S
CP9
CP05S
CP10
CP05S
CP12
CP05S
CP11
IC57
R2A20178
REF
25
7
24
VOUT3
VOUT2
8
23
VOUT4
VOUT1
9
22
VIN4
VIN1
10
21
VIN5
VIN8
11
20
VOUT5
VOUT8
12
19
BAL
VOUT6
VOUT7
+5V
VREF
R381
R385
270k
120k
R382
C326
R386
IC58
2
0.01
470k
R387
A
1
R383
33k
3
1.5k
560k
NJM12902V
R384
100k
C358
0.1
R473
100k
UNR9210G0
Q81
CLO
C460
0.1
R471
C461
0.1
15k
C462
R472
R474
0.1
100k
15k
ADSW
1
P25/SCK3_2
48
PB6/AN6/DA0
2
P23/TRCOI
47
PB7/AN7/DA1
3
46
P22/TXD
AVCC
4
45
P21/RXD
X2
5
44
P20/SCK3
X1
6
IC51
43
P87/TREO
AVSS
7
R4F20102NFA
42
P86/TRBO
RES
8
41
P85/TRAIO
TEST
9
40
P67/FTIOD1
VSS
10
P66/FTIOC1
39
PJ1/OSC2
11
P65/FTIOB1
38
PJ0/OSC1
12
P64/FTIOA1
37
VCC
CSFT
13
P60/FTIOA0
36
P37/TXD_3
14
NMI
35
P36_RXD_3
15
P61/FTIOB0
34
P35/SCK3_3
16
P62/FTIOC0
33
P34/FTCI
R463
10k
100k
CPU5
R464
8
VCC
7
WP
6
SCL
5
SDA
R460
R1EX24016ATA00A
100k
HV
HV
+5V
+5V
S5V
R396
S5V
C365
R5V
47P
270k
R5V
R397
T5V
T5V
180k
R5C
IC60
R5C
13
SO
SO
D
14
VCON
R398
12
SCK
SCK
10k
PLST
PLST
NJM12902V
NWC
NW C
TMUT
TMUT
MOD
MOD
VCON
VCON
SQIN
SQIN
LVA
LVA
T1
T1
T2
T2
LVIN
LVIN
TEMP
TEMP
RSSI
RSSI
D ISC
DISC
NOIS
NOIS
UNLK
UNLK
LDTA144EE
Q82
DS51
R469
RLED
YG
390
Q83
R468
TLED
HR
CL-165HR
1.8k
LDTA144EE
MGC1
MGC0
R466
R467
100k
100k
DUS E
CBI3
CBI2
CBI1
CBI0
CENC0
CENC1
CENC2
IPTT
IC52
1
A0
2
A1
3
A2
4
VSS
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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