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|  Probable
trouble
Step
Correction
Symptnm
Check with voltmeter for 150-volt
Defective electrical part in if.
B+ energizing potential at pro-
input selector (fig. 59).
truding terminal on feedthru
capacitor C74 (input to relay K1)
to chassis ground, with band
switch at band 1 or 3. If no volt-
age is present, check R21 and coil
of K1 for open; also check C73 and
C74 for short. Replace defective
component.
Remove operating power and check
primary and secondary windings
of T22 and R22 for open circuit.
Check C69 and C72 for short.
Replace defective component.
Defective electrical part in if.
Check with voltmeter for 150-volt
step attenuator ATl (fig. 60).
B+ energizing potential at pro-
truding terminal of feedthru
capacitor C88 (input to relay K5)
to chassis ground, with band
switch at band 1 or 3. If no volt-
age is present, check R38 for
open; if this does not correct
trouble, recheck contacts of S1
cated in S1 switch legend.
Defective electrical part in if.
Check with voltmeter for 150-volt
output selector (fig. 63).
B + energizing potential at pro-
truding terminal of feedthru
capacitor C128 (input to relay
K6) to chassis ground, with band
switch at band 1 or 3. If no volt-
age is present, remove operat-
ing power and check R61 for open
circuit before replacing relay;
also suspect C127 or C128 for
short. Check coil of K6 for con-
tinuity to ground. Replace defec-
tive part.
4
Defective detector and elec-
Meter pointer deflects to left of 0
Replace defective detector and elec-
trometer assembly A1 (fig.
trometer sealed assembly with one
DECIBELS in all positions of
MEGACYCLES band switch.
known to be operating satisfacto-
rily in another tuning unit. If this
r e m e d i e s trouble, reinstall the
known good detector and elec-
trometer assembly in original
tuning unit. Obtain a new Al
assembly from stock and install
it in tuning unit 1.
120
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