Kenwood TS 520 Owners Manual

Page 46

.4 TRANSMITTER SECTION

g a,

SYMPTOMS

CAUSE

REMEDY

ALC meter deflects with no output (no
plate current.

. No high voltage (+800vl on the final

tubes.

. Check the HV power supply.

2. Bad final tubes. 2. Replace the tubes.
3. SG switch is turned off. 3. Slide the switch up.
ALC meter does not deflect and there is 1. Too little MIC gain. 1. Increase the MIC GAIN control.
output.
The TS-520 will not operate on SSB. 1. Open microphone plug or bad micro- 1. Check the microphone.
phone.
2. Too little microphone gain. 2. Increase the MIC control.
3. Defective microphone amplifier on the 3. Repair the circuit.
GENERATOR board.
There is output, but the RF meter shows 1. RF VOLT control not adjusted cor- 1. Adjust control for 2/3 scale reading
no output. rectly. at full output.
RF meter deflects too far. 1. RF VOLT control not adjusted cor- 1. Adjust control for 2/3 scale reading
rectlv. at full output.
VOX does not operate. 1. VOX GAIN control is closed. 1. See Section 4.10.
2. VOX switch is OFF. 2. Turn the switch on.
VOX trips with AF sound from the speak- 1. ANTI VOX control requires adiust- 1. See Section 4.10.
er. ment.
VOX circuit releases between words or 1. VOX time hold control requires adjust- 1. See Section 4.10.
holds too long. ment.
Excessive plate current. 1. Detuned final section. 1. See Section 6.9.
2. Low negative power supply voltage. 2. Check the power supply output.
3. Idling current requires adjustment. 3. See Section 4.9.
Plate current is too high or too low for 1. Carrier requires adjustment. 1. Adjust CAR control.
CW.
Low drive on one or more bands but not 1, Transmitter section requires alignment. 1. See Section 6.7.
on all bands.
Broad DRIVE tuning on one or more
bands.
No drive or intermittent drive on one or 1. Heterodyne oscillator requires adiust- 1. See Section 6.3.
more bands. ment.
Low drive and broad DRIVE tuning on all 1. Bad driver tube. 1. Replace the tube.
bands.
Signal reports of carrier. 1. Carrier requires balancing. 1. See Section 6.8.
Signal reports of distortion. 1. Too much microphone gain. 1. Reduce MIC control.
Plate current is too low. 1. Bad final tubes. 1. Replace the tubes.
Tuning becomes very broad.
idling current increases.
Every time either of the final tubes is 1. See Section 5.9.

replaced, the TS-520 requires neutralize
tion.