Table of Contents
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AF AMP
(IC55)
POWER CTRL
(Q63)
AGC CTRL
(Q21)
XTAL BPF
(FI1)
1ST IF MIXER
(Q23)
IF DEMODULATOR IC
(IC3)
R5 LINE REGULATOR
(Q72)
S5 LINE REGULATOR
(Q71)
CLONE BUFFER
(Q81, D51)
CPU
(IC51)
• MAIN-A UNIT
(BOTTOM VIEW)
+5V LINE REGULATOR
(Q74)
RESET IC
(IC53)
EEPROM
(IC52)
2 - 2
TUNED BPF
(D24, D26)
RF AMP
(Q22)
POWER AMP
(Q1)
DRIVE AMP
(Q2)
PRE-DRIVE AMP
(Q3)
PRE-AMP
(Q4)
BUFFER
(Q9)
RIPPLE FILTER
(Q15)
BUFFER
(IC60)
D/A CONVERTER
(IC57)
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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