HP 6296A - Page 40

Table
5-4.
Low
Output
Voltage
Troubleshooting
(Continued)
Step
Measure
Response
Probable
Cause
•
s
Voltage
between
+s
and
11
a.
Less
positive
than
a.
QlOOB
open
+0.9V
QlOOA
shorted
Q802
or
Q80l
shoned
b,
+O.
9V
to
+l.
SV
b.
Proceed
to
Step
6
6
Voltage
between
+s
and
21
a.
OV
or
positive
a.
Q303
shorted
0302
shorted
R3
l
O
shorted
Table
S-5.
Preregulator/Control
Circuit
Troubleshooting
Step
Measure
Response
Probable
Cause
l
Waveform
between
4
and
3
of
a.
Normal
firing
pulse
a.
CRS02-CRS04
defective
T700
R50l-RS02
open
CRSOl, CR503, T800
defective
b.
No
or
abnormal
fir-
b.
T700
open
ing
pulse
CRSOO
shorted
Proceed
to
Step
2
2
Waveform
between
90
and
47
a.
Zero
or
small
posi-
a.
Q7 00
shorted
•
tive
voltage
C703
shorted
Q701
open
R703,
primary
T700
open
Proceed
to
Step
3
b.
+16
to
+20
Volt
level
b.
Q700
open
R703
shorted
Q70l
shoned
Proceed
to
Step
3
c.
Waveform
distorted
c.
Proceed
to
Step
3
3
Waveform
between
90
and
59
a.
Amplitude
incorrect
a.
Q702
defective
R707,R708,
R713
incor-
rect
value
or
open
C700,
CR710,
C711
defec-
tive
b.
Period
incorrect
b.
CR709
defective
Proceed
to
Step
4
4
Waveform
between
90
and
52
a.
Amplitude
incorrect
a.
CR708, CR709, R702
de-
fective
b.
Period
incorrect
b.
CR700
through
CR703
defective
s
Waveform
between
90
and
54
a.
Amplitude
incorrect
a.
R700, R701,
C701
defec-
tive
•
b.
Period
incorrect
b
•
CR704
throuqh
CR707
de-
fective
5-9