In Case Of Difficulty - Kenwood TM-631A Instruction Manual

6-4. IN CASE OF DIFFICULTY
Symptom Probable cause
Corrective action
Indicators do not light and no receiver noise
is heard when the POWER switch is turned
on.
. Bad power cable or connections.
. Blown power supply fuse.
. Check cables and connections.
. Check for the cause of the blown fuse and
replace the fuse.
No sound from the speaker. No signal can
be received.
. Squelch is closed.
. In the wrong BALANCE key position.
. With the TSU-6: CTCSS is operating.
. Turn the SQL control counterclockwise.
. Readjust the BALANCE key.
. Press the F key and then MUTE/CTCSS key
to turn off the CTCSS.
No transmitter output
. Microphone jack is not plugged in.
. Poor antenna connection.
. Plug jack in.
. Connect antenna securely.
Signals from the SUB band cannot be con-
troled by VOL control.
. MUTE is ON.
. BALANCE key is switched to MAIN posi-
tion.
. Press the MUTE key to clear MUTE.
. Set the BALANCE key to center position.
Weak signal cannot be received.
. Poor antenna connection.
. Connect antenna securely.
Display is dark. . Power voltage is low.
. The DIM key had been pressed.
. Check voltage for 13.8 VDC +15%.
. Press the F key and the LOW/DIM key.
No control works. . LOCK is ON.
. During A.B.C. operation, being exchanging
the bands each other.
. Set the Lock key to OFF position.
. See A.B.C. Page 18.
Programmable band scan fails during
12.5 kHz VFO step.
. The frequencies stored in Memory Channels
A and/or b are not in 12.5 kHz step.
1. Make even the frequency steps.
Memory cannot be backed up.
Backup battery voltage is low.
See Microprocessor memory back-up page 23.
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