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|  Probable
trouble
Step
Symptom
Correction
Check R235, L214, and contact W2
Defect in 105-volt B+ line to
V206B (fig. 65).
and W3 of S201A. Replace defec-
tive components, or repair switch
S201A.
Defective detector and elec-
Replace defective detector and elec-
5
Meter pointer deflects to left of 0
t r o m e t e r sealed assembly with
trometer assembly A201 (fig.
DECIBELS in both positions of
one known to be operating satis-
64) .
FREQUENCY RANGE-MC band
factorily in another tuning unit.
switch.
If this replacement remedies
trouble, reinstall known good
d e t e c t o r and electrometer assem-
bly in original tuning unit. Obtain
new A201 assembly from stock
and install it in tuning unit 2.
Remove operating power. Rotate
Faulty contacts on band switch
6
Meter Indication are present at
band switch to 20-70 MC and
S201B (fig. 65).
70-220 MC of bad switch, but
check for continuity between
cannot be obtained at 20-70 MC.
wiper (W) of switch S201B and
primary winding (ungrounded
terminal) of T201. Repair or
replace defective switch.
Reapply operating power with band
Faulty contacts on band switch
switch at 20-70 MC. Check for
S201B (fig. 65).
150-volt B+ power at plates of
V201, V202, and V203A (pin 1) to
chassis ground. No B+ voltage at
plates indicates defect between
contacts Z1 and Z2 on switch
S201A. Repair switch.
Check the primary winding of T202,
Defect in 150-volt B+ line to
and resistors R217 and R219.
V203A (fig. 65).
Replace defective component.
Check for open in R214 or R218.
Defect in 150-volt B+ line to V202
Replace defective compmnmt.
Check for open in R209 and replace
Defect in 150-volt B+ line to V201
i f necessary.
Check for open in R216 or trouble
Defect in 105-volt B+ line to
in contactsa W1 and W2 of S201A.
oscillator V203B plate, pin 6.
Replace defective resistor or
repair switch S201A.
128
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