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Short-circuit of the diode D8 1 N60.
Symptom
Probable Cause
Correction
2) Contact failure of relay RL1~ 1.
a. Check conductivity.
3) Contact failure of rotary switch $1.
. Check conductivity.
4) Short-circuit of VC2
(loading variable
a. Check conductivity.
capacitor}.
B. Oscillation
in each oscillator stops.
Car-
. Refer
to
descriptions
concerning
rier, VFO; Heterodyne crystal.
the symptom of receiver. (Page 14)
C. Degradation
of vacuum-tube
or discon-
. Check voltage at each electrode.
nection of heater.
IF unit V1 6BA6, V2_.6CB6, drive unit
V1 12GN7A V2 12BY7A.
D. Generator unit.
1) Reed relay (RL1) is defective.
. Check conductivity of contacts and
coil.
2) Contact failure of MODE switch S3~1.
. Check conductivity and voltage at
"BM" terminal.
3) Troubie in FET Q4 2SK19 GR.
a. Check voltage at each pin.
4) Contact
failure
or disconnection
at
a. Check conductivity.
around MIC GAIN VR6 (10k).
. Low output
A. Degradation
of
S-2001,
or
operation
. Check
voltage
at each
electrode.
failure.
Ascertainment by replacement.
B. Degradation of vacuum-tubes.
. Check
voltage
at each
electrode.
Ascertainment by replacement.
C. Trouble in the meter circuit (Disconnec-
. Check conductivity.
tion of lead wire).
. No deflection in
A. Control unit.
ALC (28MHz band
1) Q1 2SC856 is defective.
. Check voltage.
is out of question).
B. ALC circuit
1) Short-circuit in the ALC circuit.
. Check conductivity.
2) Contact failure of relay RL1 ~ 3.
a. Check conductivity.
C. Drive voltage is insufficient.
. Refer to symptoms 1 and 2.
. No deflection in HV.
A. Power supply operation failure.
. Refer to the power supply.
(Page 17)
B. Disconnection resistor R5 ~ 7 in the final
. Check
conductivity and voltage at
unit.
the joint of reach resistor.
. STAND-BY switch is
A. Contact
failure
of STAND-BY
switch.
. Check conductivity and voltage.
defective (including
(lever switch}
PTT).
B. Disconnection of lead wires at around the
. Check conductivity and voltage.
"VS" or "SS" terminal in the VOX unit.
C. Trouble in Q8 2SA562
in the VOX unit.
. Check voltage.
16
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