Heathkit GR-54 - Troubleshooting Chart; Common Difficulties

DIFFICULTY POSSIBLE CAUSE
Resistance reading from Primary winding of power transformer
fuscholder to ground less TO ahaetad ta eeyaimd
fusenolder to ground less T3 shorted to ground,
than 15 megohms,
Resistance
readings
less
1,
Shorted
section
in
electrolytic
capacitor;
than
70
KS
from
lugs
1
|
C57, C58,
C59,
C60, or
C61,
through
4
of
electrolytic
2,
Shorted
B+
line (osc
B+,
Hi
B+,
B+,
Lo
B+)
.
capacitor
to
ground,
|
to
tube
plate
or
screen,
|
a
atin
Bt bypass capacitor shorted,
Filament wiring, Check the brown harness
wires and green power transformer lead to
the IF-audio circuit board, Also check the
wiring to the pilot lamps,
ilaments light, but no OPR switch not in REC position,
ound with AF Gain turned 2. No shorting wire between lugs of CW KEY
Fa clockwise, | terminal strip on rear of panel of chassis,
3. Center lug of AF Gain control shorted to
| | ground,
igh pitched squeal with
Capacitor C56 installed wrong,
AF Gain full clockwise,
1
2. Lug 2 (with one wire) of phone jack shorted,
3. Resistor R54 not connected,
4
1
. Audio transformer (#51-55) leads reversed,
Audio hiss present,
but no signals can assembly, Make the following resistance
be heard. | checks from lug 1 of each bandswitch wafer
to chassis ground, Resistance readings may
vary +10% from the charted values,
BANDSWITCH] BANDSWITCH SETTINGS
WAFERS "
fF. 4% 1A n a _ TZ
(ug 4) -
| L_ BS3 2.0
BS5 502 | 12 [05 ooo
ee epi opt oto
2. Faulty component or wiring in circuit of
tubes Vi, V2, V3, and V4, Check voltages
at the lugs of these tubes, Voltage readings
may vary +20% of the values shown on the
Voltage Chart,
Antenna trim capacitor C2 shorted to
ground,
Faulty coil on bandswitch circuit board] _