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Symptom
Probable Cause
Correction
2) RF, ANT circuit
e
Mismatching of ANT and RF
coils.
Contact failure of rotary switch,
Disconnection of coaxial cable in ANT
circuit and 8.6MHz trap.
e
Contact
failure
of relay
RL1
~
1,
RiLi ~ 2 and antenna switch S2 in the
final unit.
.
e
Short-circuit of tuning variable capaci-
tor VC1, VC2.
e
Trouble
in vacuum-tubes
V3, 68Z6,
V4, 6AWS8.
Disconnection of heater.
a. Adjustment
by
SSG
or
built-in
marker.
a. Check conductivity.
a. Check conductivity.
a. Check conductivity.
a. Check
conductivity
of
variable
capacitor
after
disjointing
lead
wires to "MVC" and "DVC" termi-
nals in the drive unit coil pack.
a, Check conductivity.
4. S meter does not
swing, or swing
slightly.
. Trouble in S meter circuit.
1) Incomplete
adjustment
of
zero-set
semi-fixed variable resistor VR1 (5k).
2) Incomplete
adjustment of sensitivity-
set semi-fixed
variable
resistor
VR2
(500k).
3) Contact
failure of AGC/CAL
switch
S2 ~ 5 and relay RL1 ~ 4 in the final
unit.
. Trouble in AGC circuit.
1} Abnormal
operation of transistors Q2,
280733, Q3, 2SC373 in the IF unit.
2) Disconnection
of coil REC
L9 (1mH)
in the IF unit.
a. Adjust
it in accordance
with
in-
structions concerning adjustment.
a. Adjustment by SSG
(Refer to maintenance instructions.)
a. Check conductivity.
a. Check voltage at each pin.
a. Check conductivity.
5. Marker does not
operate.
. Marker unit.
1) Contact
failure of AGC/CAL
switch
$2~ 6.
2) Disconnection of coaxial cable leading
to the MO terminal.
3) Disconnection
of coil L171 (12mH) of
RFC.
4) Crystal oscillator X1
(100kHz)
is out
of order.
a. Check
conductivity and voltage at
the terminal ''9"
a. Check conductivity.
a. Check
conductivity
and
collector
voltage of Q1 2SC373.
a. Replace.
= TRANSMITTER
PORTION
Symptom
Probable Cause
Correction
1. No output.
A. Final unit
1) Degradation
of S-2001
or operation
failure.
a. Check
voltage
at each
electrode
or ascertainment by replacenent.
15
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