Troubleshooting - Kenwood TS-120S Operating Manual

SECTION 8. TROUBLE
TROUBLESHOOTING
SHOOTING
The problems described in this table are failures caused in general by improper operation or connection of the transceiver, not
by defective components.
Trouble Cause
Remedy
Unit completely dead with Power
switch ON.
1. Power cord disconnected or AC power OFF.
2. Loose power connector.
3. Blown fuse.
Connect power cord.
Turn AC power ON P
. Reconnect.
. Replace fuse (If fuse blows again, contact
service station)
No signals received with antenna
connected
Standby or microphone PTT switch is in transmit
position.
Place switch in receive position
No signals received, and S-meter is
deflected up scale with antenna con-
nected.
T
RF gain reduced.
Turn RF GAIN control fully clockwise.
S-meter deflects without signals.
1. Power supply voltage is too low:
2. RF circuit gain is too low.
Adjust voltage to 13.8 VDC (12 ~ 16 VDC)
Reset voltage selector to correct local AC line
voltage (PS-30)(PS-20).
. Turn RF GAIN control fully clockwise.
No SSB reception.
Wrong sideband.
Frequency remains the same when
RIT control is adjusted.
Set MODE switch to alternate SSB position.
RIT switch is OFF. Depress RIT switch ON
MHz order numbers not indicated on
Digital Display.
This is normal; the digital display will not indicate
MHz order frequencies in the following bands:
3.5 MHz band 4.0 and higher
7.0 MHz band 7.0 and lower
14.0 MHz band 14.0 and lower
21.0 MHz band 21.0 and lower
28.0 MHz band 28.0 and lower
29.0 MHz band 30.0 and higher
Digital Display is not defective.
See sect. 4-1, receiver tuning.
No output.
Standby switch not in transmit position. CAR
or MIC control in minimum position
Turn CAR or MIC clockwise.
No SSB output.
1. MIC plug loose.
2. MIC control in minimum position
Reconnect.
Turn MIC control clockwise.
VOX circuit inoperative.
1. VOX control in minimum position.
2. VOX switch in MAN position.
Turn VOX control clockwise.
Set VOX switch to VOX
VOX operates by sound from speaker.
22
ANTI VOX setting incorrect
Turn ANTI VOX control clockwise.