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HP 811 OA Service Guid e
R
em oving th e Inputs/Out puts
B
loc k
1 . First re m ove :
α . Th e in strumen t case
b . The
F
ro n t P anel
2 . Di sco nnect cables :
α. Output 2 cable
f
rom Output 2 board, if this
b
oard i s fitted
b.
Outpu t 1 cable
f
ro m Output 1
b
oard
c .
T
ri gger In
f
ro m t he Timing
b
oard
d .
T
ri gger Ou t
f
rom th e Timing
b
oard
e . Stro b e Ou t
f
rom the Timing b oard
3 . Carefully pull back all th e cables, rem ovin g them from cable
5-2 6
Disassembly and
R
eassemb ly
clamp s a n d
m
o untings, n oting their p osi tions
4 .
R
emove 9 scre w s securing the Inputs/Out puts Block to the chass is
and remove t he block. Figure 5-15 s how s the positions of the
fixing screw s
HP 811 0/i S
U
B
FR
O
N
T PANEL
I
NP UTS/OU T PUTS BLOCK
0
0
-
e
-e
F
ig ure 5-15 . I npu ts/Out
p
uts
B
loc k
S
h owin g th e
F
ixing Sc r ews
You can now repl ace any
o
f th e BNC connectors with the ir associated
cabl es, as
f
ollows :
R
e p laci ng or
R
efitting t he I nputs/Outp uts
B
lock
a
nd Cab les
M echa nically, re placing or refitt ing th e Input/O utput block is the
reverse of removal. But the following
p
oin ts should
b
e observed:
1 . When
c
h angin g input or output cabl e assemblies,
n
ote t hat t here
i s α flat area on eac h BNC connector, and α corres pondin g flat
in the ch assis fixing ho le. Ali gn these
b
efore fitting the BNC
connector an d cable
2 . Th e
f
ollowin g fig u re gives the num bers of t he replacem ent
cable/ BN C connector assemb lies :
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