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HP 811 OA Service Guide
Instructions for Replacing or Retrofitting HP 8110Α
S
ubassemblies
Caut
i
on
6
Disconnect th e instrumen t
f
rom the mains
p
ower
b
e fore di sassembly !
Th e foll owing sections sh ow you how to remove and refit
sub assem bli es . Ge nerally , refitt ing is t he reverse of remo v al, but
wh ere t hi s differs,
n
otes are included
f
or gui dance.
R
etrofitt ing uses
t he step s in re verse, in the same way as refitt ing.
As α ge n eral rule, do
n
ot t ighte n PC
b
oard fixing scre w s un til all
t he screws have been inserted and
p
art ially ti ghtene d. Thi s help s to
avoi d flexin g th e
b
oard by secur ing
i
t unevenly.
Diagra m s s h ow where the fixing screws are
l
ocated, but depen ding on
th e o p t i o n s fitted to the in strument
y
o u are wor kin g on, th e d i agra m s
m
ay not
b
e identical. For example, som e HP 8110Α versi ons ha v e
th e BN C connectors on t he rear
p
anel , while others ha ve the BN C
conn ectors on the
f
ront
p
anel. Bot h p ositions ha v e
b
een s h own in t he
di agrams .
Note the
p
osit i on
o
f all cabl es when you remo ve
b
oards, as incorrect
reassembly can cause damage to t he cables. Also, noi se
l
evels can be
degraded by wrong
p
osi tioning.
Disassembly and
R
eassembly
5- 7
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