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Page Title:
Main unit, with tuning unit 1 interconnected by test harness (fig. 46). |
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|  Symptom
Correction
Probable
trouble
Step
Check continuity between terminals
Open primary or secondary in
1
Power cord plugged into 110-125-
1-2, 3-4, and 5-6 of T801. If
transformer T801 (A, fig. 40).
volt ac power source; power
open is indicated, replace trans-
switch S801 (B, fig. 40) at ON.
f o r m e r T801.
120-240-volt switch S802 at
Check for 120 volts ac at terminals
Open feedthru capacitor C801 or
120V; no output.
5 and 6 of T801. If incorrect
C802 (A, fig. 40).
voltage (+20% of nominal value)
i s present, check capacitors for
continuity and replace if neces-
sary .
Check switches and replace if
Open power switch S801 or open
120V-240V switch S802 (A or
necessary.
B, fig. 40).
Check for continuity between termi-
2
One primary of T801 open (A,
Output available when 120V-240V
nals 1 and 2 and between termi-
switch is at 120V (B, fig. 40)
nals 3 and 4 of T801. If open is
but not when switch is at 240V
i n d i c a t e d , replace transformer.
( c , fig. 40).
Defective 120 V-240V switch (B
Check switch for proper continuity
and replace if necessary.
or C, fig. 40).
Correction
Symptom
Probable
trouble
Step
1
Power switch at ON; main unit
Defective power switch S710 (fig.
Check switch for continuity; replace
pilot lamp and MEGACYCLES
i f necessary.
dial illumination lamps on tuning
Dirty or defective interlock
Check interlock switch; clean or
unit do not light.
microswitch S711 at top of main
r e p l a c e if necessary.
unit (fig. 51).
Dirty or defective interlock
Check plungers of interlock
switches S901 and S902 on test
switches (fig. 39) which are
mounted on top of housing for
P902 and P903. Check to see that
P902 is inserted as far as possi-
ble into mating connector on tun-
ing unit; similarly, see that P903
is inserted as far as possible
into connector J701 in main unit.
Clean or replace switches if
necessary.
Open 6.3 v ac secondary (termi-
Check continuity of primary (termi-
nals 17 and 18) or open primary
nals 1 and 2) and between termi-
(terminals 1 and 2) of power
nals 17 and 18 of transformer. If
transformer T702 (fig. 51).
open is indicated, replace trans-
former.
2
P i l o t ad MEGACYCLES dial illu-
Open secondary on power trans-
Check continuity between secondary
mination lamps light; equipment
former T702 (fig. 43).
terminals. If secondary is open,
does not operate.
replace transformer.
Defective rectifiers CR701
Check rectifiers and replace any
found defective.
55) .
Measure voltage at terminal 2 of
D e f e c t i v e rectifier V704 and
P701. If less than 150 volts is
present, check R783, R784, L722,
Defective regulator V708.
C734A, and C734B; check vibrat-
ing regulator K703. Check V704,
V705, and V708.
3
Make voltage and resistance checks
INPULSE GENERATOR DB ABOVE D e f e c t i v e resistor or capacitor
i n repetition rate generator
lV/MC switch at ON; no audio
parts. Check V703 (fig. 52).
stage V703A or in impulse
heard in headset, even with front
generator drive stage V703B.
panel GAIN and VOLUME controls
Defective V703.
rotated completely clockwise.
108
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