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Table
5-3. Bias
and Reference Circuit Troubleshooting
Meter
Meter
Nonnal
If
Indication
is
not Nonnal,
Step
Common
Positive
Indication
Check
the
Following Parts
1
33
40
33
:i:l.
7 vdc
CR31, C21
2
-s
33
6
.2 :i:O.
3 vdc
CR6,
CR14
, VR4
3
27
33
34
.1 ±1. 7 vdc
CR30
,
C20
4
51
-s
19 . 5 ±
1.
0 vd c
QlO,
Ql 1
5
5
1
24
10.3
±0.6 vdc
CR27, VR3
6
51
22
9.
7
::t:O.
5 vdc
R40, R43, Q6
7
51
21
9
.
7
:i:O.
5 vdc
R38, R42, Q5
Table
5
-4.
High
Output Voltage Troubleshooting
Meter
Meter
Step
Common
Positive
Response
Probable Cause
1
Emitter of
Q4
29
<o.
5 vdc
a. Q4 shorted
b
.
Rl6 shorted
c
.
Rl5
shorted
2
14
17
>O.
85 vdc
CR7 open
3
14
33
<2 vdc
a.
Ql
open
b
.
Q2 shorted
c
.
CRl
shorted
d
.
R2-R8 open
Tabl
e 5-5. Low Output Voltage Troubleshooting
Meter
Meter
Step
Common
Positive
Response
Probabl
e Cause
1
Emitter of
Q4
29
>
5 vdc
a.
Q4
open
b. Rl6 open
c. Rl5 open
2
14
17
<O.
4 vdc
CR7
shorted
3
14
33
>6
vdc
a
.
Ql
shorted
b.
Q2 open
c
.
R2-R8 shorted
5-
20
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