Icom IC-735 Common Questions

Most Common Service Questions for the Icom IC-735
The information on this page is subject to the
Symptom:
Probable
Cause:
Cure:
Remarks:
Symptom:
Probable
Cause:
Cure:
Symptom:
Probable
Cause:
Cure:
Symptom:
Probable
Cause:
Cure:
Symptom:
Probable
Causes:
Cure:
Service FAQ Index page.
Erratic display, segments missing from frequency display. Radio
seems to work OK otherwise.
Bad solder at IC1 display driver on display unit.
Resolder pins on IC1.
IC1 is a surface mount IC.
Intermittent RX/TX. Intermittent high SWR. Seems like antenna is
intermittent.
Cracked solder joint at antenna connector.
Resolder joint at antenna connector where it connects to the filter
unit. We recommend replacing the thin wire between the filter unit
and antenna connector with a thicker wire to prevent future failure.
Intermittent RX. Seems like antenna is disconnected in receive mode.
TX is OK.
Cracked solder at external RX phone jack on main unit.
Resolder phono jack to main unit.
No TX, or low TX output on one or more bands with high current
draw from power supply. Other bands are OK.
Damaged components in low-pass filter.
Replace all obviously burned/overheated components on filter unit.
Also inspect PA for overheating
Raspy-sounding mic audio when used on antenna. Radio sounds
good when transmitting into dummy load. Power output seems
normal. May be complaints of RFI
1) Station ground is inadequate. 2) Astron power supply used with
unit needs additional RF decoupling. 3) RF feedback in mic circuit.
Check station ground. If an Astron power supply is being used with
radio, install additional decoupling capacitors across output
terminals. Short pins 6 & 7 in microphone connector to remove RF
terms and conditions set forth on the ICOM America