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Out
p
ut
B
oar
d
HP 8110 Α Ser vice Gui de
Som e
p
arts o f this
b
oard co nsist of data-co ntrolled devi ces and
tro ubl es hoot in g is red uced to replac ing s uspect devi ces . Other
p
arts
of t he
b
oard use 5ΜΤ . H owe ver,
b
asic checks can be performed on
some
p
arts of t h e c ircui try :
O
nboard Regulators
1 . Chec k Ul pin 1
f
or +32 V
a
nd pin 3 for +15 V
2 . Check U 2 pin 2
f
or +12 V
a
nd pin 6 for +5 V
3 . Ch eck U 100A pin 2
f
or +5 V and pin 1 for -5 V ( inv erter)
4 . Ch eck U 3 pin 2
f
or -32 V a nd pin 3
f
or -15 V
5 . Ch eck U 104 pin 3
f
or +15 V and pin 2
f
or +12 V
6 . C h ec k U 106 pin 1
f
or +12 V
a
n d pin 3 f or +5 V
7 . C heck U 107 pin 1
f
or -12 Vand pin 3
f
or -5.2 V
8 . C heck U 156 pin 1
f
or +12 V an d pin 3
f
or +5 V
9 . C h eck U 157 pin 2
f
or -12 V and pin 3
f
or -5.2 V
Delay Ge n er ato r
1
. C h ec k t h at t h e inpu t signal is
p
resent at the
j
unct ion of CR100
an d C R101
2 . Select various
D
el ay sett in gs on t he in strument an d check that
v ol tages are av ailable
f
rom U 102 pin 1 (hi gh imp edan ce) and
U
100 B pin 7 .
3 . C h eck that
U
101 B pin 7 and U 101 A pin 1 mirror changes in
U 100 B pin 7 v oltage . Check Q101 and Q103
4 . C h ec k
t
h at t h e outpu t s ignal is ava ilable at pin 1 Η on TJ103, the
TI GER IC
W
i dth Ge n e rator
1 . C hec k t h at t h e input signal is
p
resent at pin 11Η on
U
153, t he
Widt h TI GER I C
2 . Se l ect v ari ou s Wi dth settings on th e instr ume nt and check t hat
vol tages are a v ailable
f
rom
U
152 pin 1 (high impedance) and
U 100D pin 14
3 . Ch eck th at
U
151 B pin 7 and U 151 A pin 1 mirror changes in
U100 D pin 14 vol tage. C heck Q151 and Q153
4 . C heck t hat different ial
o
utput signals are available at pin s 1 Ι
a
n d
1Η on
U
103, t he Wi dt h TIGER IC pin
Tro ubles hooti ng
4-2 1
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