Model 3575A
5.51.
GENERAL SEBVICING
INFORMATION.
5-51.
This
portiul of Section
V
contains
instructions
lor
removing and
replacing assemblies
and conrponcrlts,
ser-
vicing ctched
circuit boards
and cleaning
the displal'
windorv.
5-53. Cautions.
5-521.
The following
prccautiotis
should be
taken
rvlierr
renroving,
replacing
or
handling 3575A
assctltblies
and
conlponcnts.
Failure to
observe these
precautiors can result
in danrlgc
or degrlded
periirtlancc.
a.
Turn off
the
3575A before
removing or
replacing
a
printed-ciJcuit
assembly.
b.
Mren replacing Assenblies Al
through A(r, bc
careful llot to
pinch
cables
between the assenrbly cover
and
the card'rest
ftarne.
c. The
folkrwing assemblies must be CLEAN
HAN-
DLED;
l)
Prearnplificr
Assemblies
Al
/Al
2)
L)g
(inlverter
Assemblies, A-i/A4
3)
Phase
(lortrol
Filter Asscnrbly,
A7
4) Output
Filler Assemblies,
A9/Al0
5-55.
Assembly Removal.
5-56. The follorvirg
procedures
outline
the
sleps
rcquired
to remove each of thc nrajor assr'nrblies
within the
instrunrenl. Assenrblics cln be replaced by
reversing the
proccdures.
5-57.
Preamplifier
Assembly
(A1lA2)
Removal.
a.
Rcnrove tlle
screws that fastcn thc Al/A: top cover
to tllc card-ncst Iranrc.
b. Unplug cable
W3
/W.l
by
pulling
upward
at A1/A2
Jl
(ouTPUT
TO LoG CONV).
c.
Carefully
rcnrove
Al/Al by
pulling upward on the
tabs
at the erds
of
the A I
/Al
top
cover.
d.
The input cablc rnust bc taken oLrt of
its
slot at the
top of the
board
and orrtput cable tlisconlcctcd to allorv
A1/A2
to be
nrounted on the
22-pin
PC extender
(-hp-
-5060-5989)
supplied with the instrlrnrent. Il A1/A2 is to
be
placed
oo tlie extender. irst iltstall the extender in thc
Al/'A2 socket. Then
place
A1/Al on the
extender
ar'rd
reconncct
output cable
w3/w.1.
e.
lf it is necessary to remove Al/A2 conpletely,
disconnect the input cable
from
Al
/A2.
To disconnect the
cablc, remoyc
the
screw
tlut
fastens the cable shield to the
gound
lug ard
unsolder
the center conductor
lrom
the
stand-off
pin.
GENERAL
SERVICING INFORMATION
Section
V
5-58. Log Converter Assembly
(A3/A4)
Removal.
a.
Rer
)ve the six screws that
fasten the A3/A4
top
covcl to the card-nest
frame.
b. Unplug cable
W3/W4
from
the
PreanPlifier
board by
pullilrg
upward
at A1/A2
i2
(OUTPUT
TO
LOG COW).
c. Carefully
renloye A3/A.+ by
pulling upward on thc
tabs at the
cnds of the ,A3/A4
top cover.
d. The
input and
output
cables
are
long ettough
to
allow
A3/A4 to be nounted
on the 22-pin
PC Extender
(-hp-
5060-591i9) supplied with the
instrument.
If .{3/A4 is to
be
placed
on the
extender,
first
install
the
extender in the
A3/A4 socket.
Then
place
A3/A4
on the extender and
reconnect input cable
W3/W4.
e. If it is
necessary to
remove A3/A4 completely,
remove the screw that
fastens the drield
of output cable
W5/W6
to the A3
/A,l
top coyer
and disconnect the cable
leads
from
A3lA1
J2.
5'59-
Phase
Detector Assembly
(A5)
Removal.
a. Renlove the
six sorews
that fasten the
A5 top cover
to the card-nest ftame.
b.
Renrove
the
A6
assentbll'
and carelully
unplug
cable
W7
from the Current Source board
at A6J1
(INPUT
F'I{O1\,I PHASE DETECTOR).
c. Being careful tb avoid straining the other
two cables
connected
to
A5, remove
45
by
pulling
upward
on
the tabs
at the
ends of
the
A5
top cover.
d. The cables
going
to A5 are long enough
to allow A5
to be mounted on the
22-pin Extender
(-hp-
5060-5989)
supplied
with
the instrument. If A5 is to be
placed
on
the
extender.
first install the extender in
the A5 socket. Then
place
45
on
the
extender
and reconnect cable W7 to the
Current Source Board.
e.
If it is necessary
to remoye A5 completely,
remoye
the
screws that
fasten
input
cables
W5 and W6
to the A5
top cover. I)isconnect W5
and
W6 from
A5
J2
and J3.
Wher
reinstalling
A5 be
sure that the input cable
from
channel A
(
43l is
connected Io the
pins
marked A and
T
and
the input cable from
channel
B
is connected to the
pins
marked B
and
B.
5-60. Current Source Assembly
(46)
Removal.
a. Remove the six
screws that
fasten
the A6 top cover
to the card-nest
frame.
b. Unplug
cable
W7 by
pulling
upward at
A6Jl
(INPUT
FROM
PHASE DET).
5-15
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