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8 . Disconnect t
h
e wires and resistor from t
h
e I
NPU
T
BN
C con
n
ector .
10 .
R
emove t
h
e attenuator board wit
h
cam switc
h
from
t
h
e instrument .
C . A
MPL
I
F
I
ER
CI
R
C
U
IT
B
OA
R
D
REM
O
V
A
L
1 .
R
emove t
h
e
p
lastic plug-in gui d e from t
h
e rear of t
h
e
instrument .
2 . Disconnect t
h
e wires connected to t
h
e boar d from
t
h
e front- p anel controls .
3 . L oose
n
t
h
e h ex-soc
k
et screw in t
h
e cou
p
ling of t
h
e
VA
R
IA
BLE
control
s
h
aft using α 0 .050-inc
h h
ex-
k
ey
wrenc
h
. Pull t
h
e V A
R
IA
BLE k
nob and glass s
h
aft from t
h
e
front of t
h
e instrume
n
t.
4 . Disconnect t
h
e in d uctor, capacitor, an d two groun d
stra p s from t
h
e front of t
h
e boar d .
5.
R
e
m
ove t
h
e screws an d
n
uts securing t
h
e boar
d
to
t
h
e c
h
assis or ot
h
er mounting surface .
Switc
h R
ep lacement
R
ecalibration After
R
e p air
Several ty
p
es of switc
h
es are use d in t
h
e 7 Α 16 Α . T
h
e
After any electrical compo
n
e
n
t
h
as
b
ee
n r
e p lace d , t
h
e
sli
d
e and micro switc
h
es s
h
oul d be re p lace d as α unit if
cali
b
ration of t
h
at
p
articular ci
r
cuit s
h
oul d
b
e c
h
ec
k
e d , as
d
amaged . T
h
e following special mainte
n
a
n
ce i
n
formation is
well as t
h
e cali
b
ratio
n
of ot
h
er closely relate
d
circuits .
p
rovi d ed for t
h
e cam-type switc
h
es .
R
efer to Section 5 for t
h
ese
p
roce
d
ures .
7 .
R
emove t
h
e atten
u
ator s
h
iel d s .
9 .
R
emove t
h
e I
NPU
T
BN
C co
n
nector .
11 .
R
e p lace
b
y reversing t
h
e R emoval
Pr
oce
d
ures .
6 .
R
emove t
h
e board from t
h
e instr
u
ment .
7 . To replace, reverse t
h
e ord er of removal .
Α . CAM-TYPE S
W
ITC
HE
S
M
aintenance- 7 Α 16 Α
Repair of cam-type switch es sh o
u
ld be under ta ken
only by experienced maintenance personnel. Switch
alignmen t and spring tension of th e contacts must be
carefu lly maintained fo
r
proper operation of the
switch .
F
or assistance in main tenance of cam-typ e
switch es, contact you
r
local
TEK TR ONIX Field
Office or representative .
Α cam-type switc
h
consists of α rotating cam, w
h
ic
h
is
turned by t
h
e front- p anel
k
nobs, an d α set of co
n
tacts
mou
n
te d
on
an
a
dj
acent circuit
b
oard . T
h
ese switc
h
co
n
tacts are actuate
d
by lo
b
es on t
h
e cam . T
h
e V O
L
TS/
DI
V
an d AC-G
N
D-DC (co
u
pling) cam-type switc
h
es can be
disassembled for i
n
s p ection, clea
n
ing, re pair, or re p lace-
ment as follows :
1 .
R
emove t
h
e
R
ea d out boar d an d
t
h
e Attenuator
b
oar
d
/switc
h
assem
b
ly as
d
escri
b
e
d p
reviously . T
h
e front
switc
h
section on t
h
e Atte
nu
ator
b
oar
d
is t
h
e AC-G
N
D-DC
switc
h
an d
t
h
e rear switc
h
sectio
n
is t
h
e V O
L
TS/DI
V
switc
h
. T
h
e switc
h
es are now o
p
en for inspection or
cleaning .
2 . To com
p
letely remove t
h
e switc
h
from t
h
e
b
oar
d
,
remove t
h
e two screws and fo
u
r
h
exagonal posts w
h
ic
h
h
ol d
t
h
e cam-ty p e switc
h
to t
h
e circuit boar d .
3 . To remove t
h
e cam from t
h
e front s
u
pport bloc
k
,
remove t
h
e retai
n
ing ring from t
h
e s
h
aft on t
h
e fro
n
t of t
h
e
switc
h
a
n
d sli
d
e t
h
e cam out of t
h
e su pp ort
b
loc
k
.
B
e
caref
u
l not to lose t
h
e small d etent roller .
4 . To
r
ep lace
d
efective switc
h
co
n
tacts, follow t
h
e
instr
u
ctions give
n
in t
h
e switc
h
repair k it .
5 . To re-install t
h
e switc
h
assembly, reverse t
h
e above
p
roced ure .
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