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HP 811 OA Service Guid e
5 . C heck
S
upp ressor XS403
-12
V
Regulator
P roceed as
f
oll ows :
4- 1 4 T
r
o
u
bles
h
ooting
1 .
U
sing α Vo lt meter
m
eas ure voltage
b
etween L413 and L414 . Thi s
s h oul d
b
e greater than 12 V
2 . Ch eck Z en er di ode Ζ408
3 . Ch eck in d u ctors L 413,
L
414, L425 and L428
f
or ope n-circ uit
4 . Ch eck
e
l ectroly tic capacitors C E464, C E465 and C E 467
f
or
short-ci rc ui t
5 . C h eck
S
upp ressor
X
S404
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