Kenwood TS-820 Operating Manual page 42

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7.4 TRANSMITTER SECTION
SYMPTOMS
CAUSE
RF
meter dcflocls with no output
(no plate
1.
No high vo ltage (+80011)
on the final
. cu rrent.)
tu bes .
2.
Bad final tubes.
3. SG switch is turned o ff.
ALC met er d Oll$ n o t defl ec t
and there is
1.
Too little MI C gain.
output.
Th e TS ·820 will not operate on SSB.
1. Open microph one p lug o r bad micro·
phone.
2 .
Too li ttl e microphone gain.
3. Defec tive m icrophone ampl if ier on the
GENERATOR board.
There is output,
but the AF meter shows
1. RF VO LT control no t
adjusted cor·
no ou t put.
rectly.
RF meter d eflects too far.
1.
RF VO LT control no t adjusted cor·
rectly.
VOX does not operate.
1. VOX GAIN control is closed.
2 .
VOX switch is OFF.
.
VOX trip s with AF sound lrom the speak·
1. ANTI
vox
co ntrol requires adjust·
er.
men t.
vox
circ ui t releases between w ord s or
1. VOX time hold control requires ad just·
holds
to o long.
ment .
Excessive plate curre nt.
1. Detu ned final section.
2. Low negative power supply voltage.
3. Idling cu rrent requ ires adj ustment.
Plate
current is too
h igh or too low for 1. Carrier requires adjustment.
cw.
Low d rove on one or more bands but no t
1. Transmi tter sectio n requires alignmen t.
o n a ll bands.
Broad ORIVE tuning
on one o r more
bands.
No drive o r
intermitte nt drive on one or
1.
PLL unit requires adjustment.
more bands.
Low drive a nd broad DRIV E tuning on all 1.
Bad d river tube.
bands.
Signal repor ts o f carrier. 1. Carrie'r requires balanci ng.
Sig nal reports of d istortion.
1. Too much microph one gain.
Plate current is too low.
1. Bad final tubes.
Tuning becomes very bro ad .
Id ling current increases.
Every rime ei th er of the
f inal tubes
IS
replaced,
the TS-8 20 requi res neutraliza·
tio n .
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R EMEDY
1. Check th e HV power supply .
2.
Replace th e t ubes.
3
. Slide the switch up.
1. Increase the MIC GA IN contro l.
1. Check th e microphone.
2. Increase the MIC GAIN conlrol.
3 . Repair the circuit.
1. Adjust control for 2/ 3 scale reading
at fu ll ou tput.
1.
Adjust con trol for 2/3 scale re ading
at full output.
1.
See Section 4. 12
2. Turn the sw itch on.
1. See Section 4. 12.
1. See Section 4 . 12.
1. See Section 6.4
2.
Check the power supply o u1pu t.
3. Sec Seclion 4. I I
1.
Adjust CAR control.
1. See Sec1ion 6.4.
1. See Section 6.4.
1. Replace th e tu be.
1.
See Sec1ion 6 .4
1. Reduce
MI C con tro l.
1.
Replace the tubes.
1. See Section 6.4
41
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