Table of Contents
Advertisement
SYMPTOMS
CAUSE
REMEDY
HEATER
switch
and/or
SG
switch
is turned
off.
3. Turn
the switches
on.
ALC
meter
does
not deflect and there
is output.
. Too little MIC GAIN.
. ALC
meter
requires adjustment.
1. Increase MIC GAIN.
2. See Section 6.11.
The
TS-900
will
not operate
on
SSB.
. Open microphone
plug or bad micro-
phone.
. Too little MIC GAIN.
Defective
microphone
amplifier
on
the GEN
board.
1. Check the microphone.
2. Increase the MIC GAIN.
3. Repair the circuit.
There is output, but the RF meter shows
no output.
. RF VOLT
control
not adjusted cor-
rectly.
. Defective detector diode, D1, in the
final section.
1, See Section 4.7.
2. Replace the 1N60 diode.
RF meter deflects too far.
. RF VOLT
control not adjusted cor-
rectly.
1. See Section 4.7.
VOX does not operate.
. VOX GAIN control is closed.
. Stand-by
switch
is in the REC
or
SEND
position.
1. See Section 4.8.
2. Set the stand-by switch to VOX.
VOX
trips
with
AF
sound
from
the
speaker.
. ANTI
VOX
control
requires adjust-
ment.
1, See Section 4.8,
VOX
circuit releases between
words or
holds too long.
. VOX
time
hold
control
requires
adjustment.
1. See Section 4.8.
Excessive plate current.
Detuned final section.
Low
negative power
supply
voltage.
Idling current requires adjustment.
1. See Section 6.7.
2. Check
the power
supply
output.
3. See Section 4.7.
Plate current is too high or too low.
. Carrier requires adjustment.
1. See Section 6.11.
FSK frequency shift is not correct.
1. See Section 6.3
Low drive on one
or more
bands but
not on all bands.
Broad
DRIVE
tuning
on
one
or more
bands but not on all bands.
. Transmitter section requires alignment.
1. See Section 6.5.
No drive or intermittent drive on one
or more bands.
. Heterodyne oscillator
requires adjust-
ment.
1. See Section 6.2.
Low drive and broad DRIVE
tuning on
all bands.
Bad 6GKG6 driver tube.
1. Replace the tube.
41
Advertisement
Table of Contents
