BK Precision 467 - Page 8

TROUBLESHOOTING
CHART(cont
U.
)
Symptom
Check
No indication
of
leakage.
1.
1?0
volt
power
supply
voltages.
2.
Transistors
Q5, Q6,
and
Q?.
3.
Neon lamps N5,
N6, and
N?.
4.
Multiplex
generator
waveforms.
5.
IC1A, ICIB, rCzC,ICzD.
One
meter
moves upscale
when other
two
G2 1. Transistors
Q5,
Q6,
or
Q?
(the
one switching
controls are
turned up.
Itrnction
switch
in
that meter).
CUT-OFF
position.
One
meter reads
noticeably
higher
than other 1.
Transistors
Q5, Q6,
or
Q?
(the
one
switehing
two. Function
switch in
CUT-OFF
position.
that meter).
One
meter falls
noticeably
lower
than
other
two
1.
Transistors
Q5,
Q6,
or
Q?
(the
one switching
in
Tracking
test.
that meter).
Tracking
control works, but in
reverse
di- 1.
Transistor
Q10.
rection
and/or
not
with full range.
2.
Traeking Range
adjustment
(R23).
Tracking
circuit
inoperative.
1.
Transistor
eB,
eg,
or
e10.
2.
Voltages and
components in
clock circuit.
3. IC2A and IC2B.
4.
Tracking
control
R22.
5. Min Pulse
Cal
control R23.
Restore
F\rnctions inoperative.
1.
2?0 volt
power
supply voltages
2. Ballast tubes 11
and
X2.
3. Rectifiers D5,
D6, and
D?.
4.
Rejuvenate
switches 56A,
S?A, ard S8A.
5.
Remove
Short
switch
S4A and
S4B.