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3 - Troubleshooting
36
Disable the OV ca
p
abilit
y
b
y
shortin
g
R351. After the
p
rotection is disabled,
p
ro
g
ram
the out
p
ut volta
g
e to zero,
current to full scale and Out
p
ut
ON. If the unit is in "Protect"
mode, Press Protect Clear. The
out
p
ut should now
g
o hi
g
h and
not tri
p
the OV.
Is the CV
annunciator on
?
Vmon,
U315B-7,
OK ?*
No
Check Volta
g
e Monito
r
A
m
p
lifier, U315B
circuit
No
CV
_
Pro
g
,
R401
~0V
?
Yes
A
2 Interface Board
No
Check Volta
g
e Control
U315A, circuit
Yes
Volta
g
e <0.6V
?
Measure volta
g
e at the
base of Q303 with
res
p
ect to its' emitte
r
Yes
Troubleshoot Volta
g
e
Gain Sta
g
e
No
Troubleshoot Out
p
ut
Sta
g
e
Yes
* V
_
mon should be a
pp
roximatel
y
6632B or 66332A Vout/4.25
6633B Vout/10.52
6634B Vout/21
Figure 3-1 Sheet 12. High Output Voltage