d. Troubleshooting Chart.
Probable trouble
Correction
1. Line power indicator
No sc power applied to rf
Check for proper input line voltage.
lamp does not light
amplifier.
when power cord is
connected to power
Open fuse F1 in power
Replace fuse F1. If the replaced
source and power
supply.
fuse blows, refer to paragraph 7.
switch is set to ON.
Defective indicator lamp
Replace indicator lamp.
DS1.
Defectiv e wiring to DS1
Check continuity of wiring to lamp.
lamp.
Defective power switch
Check with ohmmeter for proper
operation; replace if defective,
S2.
Defective transformer T1.
Check resistance of T1 (para 11);
replace if defective.
2. Line power indicator
Defective rectifier CR 1.
Replace CR1.
lamp lights; filaments
of V1 and V2 do not.
Open resistor R27.
Replace R27.
Defective V1 or V2.
Replace V1 or V2.
Defective V4.
3. Line power indicator
Replace V4.
lamp lights, but
filament of V4 does
Open 5-volt filament wind-
Replace T 1.
not light.
ing.
Defective V5 or V6.
4. Filament of one or
Replace V5 or V6.
both tubes V5 and
Open 6.3-volt filament
V6 does not light.
Replace T1.
winding.
Defective voltage regulator.
5. Output is distorted.
Check output of voltage regulator
Defective V1, V2, or V3.
Replace V1, V2, or V3.
Capacitor C 11 improperly
Readjust C11 (para 15).
adjusted.
Defective V1, V2, or V3.
Replace V1, V2, or V3:
6. Rf amplifier does not
produce a 20-db gain
when GAIN switch is
Defective switch S1.
Check switch S1 and replace if
defective.
set to 20 DB, or does
not produce a 40-db
Readjust R6 (para 14).
Resistor R6 improperly
gain when GAIN switch
is set to 40 DB.
adjusted.
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