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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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