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5.2 .3
PR
I
N TED-CI RCU ΙΤ BOAR D SE RV ICI N G
PR I N TE D-CI R CU IT
BOAR D CO NNECIORS - When
r
ei nstalling α cable νοιιηυ ctυι an α printed-c ιιευίτ
b
oar d ,
be su re the connector is Properly aligned with the board
con
n
ector
p
i
n
s a
nd
t
h
at t
h
e
connector
faces t
h
e
p
ro
p
er
d
irection (see Figu re 5-3) .
METER BOAR D lC315) REM OVAL - Removal of th e
M
eter
B
oard asse m bly re quires that t h e Attenu ator dial,
OUTPUT VERN I ER knob an d potentiometer
r
etaini ng
n ut, and front top rail he remove d. The Meter Board is
sec
u
re
d to
f
r
ont
panel
b
y t
h
ree screws - one t
h
ro
u
g
h
the
f
r o nt
p
anel ibe hi nd Atte nu ator
d
ial) and one at each to p
co m e r of Meter Board,
R
emove these throe screws and
d
is-
engage all slip-on wire connectors from the Attenuator
m
ou nted switch . The Meter Board asse mb ly can then be
move d towar d
t
h e rea r until the VERN I ER potentiometer
s
hah, UNLEVELE D Ιιιmρ, an d METER case clear t h e from
panel.
T
he
b
oard can then be lifted from th e instrument .
The Meter Boar d is reinstalled by reve r si ng th e re moval
procedure. When installing the
M
eter Board,
u
se care
n
ot
to
d
a m age t h e UNLEVELE D lamp .
M
OD ULATIO N BOA R D (C316-2)
REMOV AL -
T
h e
Modulation
B
oa rd assembly can be removed by t h e
f
ol-
lowi ng
p
roce du re : Disengage th e slip-on connectors from
t
he six
B
CD
L
ever/Indicator switches ;
d
isengage the twelve
pin connector from
t
he
M
odulation Board; unsolder the
wi re from ΕΧΤ modulation connector and re move retaini ng
nut fr om the
b
ac ksi de of t h is BN C connector; remove the
b
lack spring-loaded kn obs from
M
ODUL ATIO N M OD E and
FRED switches ;
r
emove t h e kn ob from the FRE O VER .
N
I ER pot s h aft ;
r
em ove t h e front-top rail ; t hen remove one
screw from the top-left corner of the
M
odu lation Board and
one screw
f
r o m
t
he top-left co rner of the
M
eter
B
oa rd . Th e
M
o du lation Boar d asse mb ly ca n now be a ngled until the
switch levers clear the front panel . The assembly t h e n can
be lifted from instru ment.
T
h e assembly is reinstalle d
b
y reversi ng th e removal
procedu re .
ΝΟΤΕ
Wh e n Placing connectors on
L
ever/I ndicator switches,
b
e sure eac h connector is on correct switch: the switch
cables
b
reak out of t h e main harness in the sa me or der
t
hat the switch es appear.
PO WER
S
UPPLY
B
OA R D
REM OVAL -
T
he Power
Supply
b
oard and
h
eatsin k can
b
e
r
emoved by re movi ng the
fou r screws whic h secu re the printed circuit board to the
instrument rear panel. After removal of the connecting
h
a r -
n ess, the board can be carefu lly lifte d fro m
t
he instrum ent .
CA UTION
T
he Power Su pply
b
oa rd may be raised fa r enough to allow
checking of many components with t h e
h
arnesses still
connected ;
h
owever, power m ust NOT
b
e applied to the
instrument unless t he negative (ground ) si de of C10 is
connected to t h e instrument
c
hassis ground an d to
t
he
positive (g r o und) side of ς 9 lium per wi res are sufficient) .
T
he Power Sup ply boar d is reinstalled
b
y reversing the
removal procedure.
5.2 .4
RE COMMEN D E D T EST EQUIPMENT
The test equ ip men t nu mbered (1) thro ugh (8) in Ta ble 4 1
is recommen ded for servicing, trou bleshooti ng and
call
b
rating the i nstrument .
5.3
CA LIBR ATIO N PR OC EDURE
R
emove t h e instrument top and bottom covers- Allow Tt
two
hour
ωα rm ιιρ
p
eriod
b
efore cali brating.
In genpral, calibration should be performed in the Sequence
given . Rcter ii) fn q υres 5-4, 5-5 and 6-6 for test point and
adjustment locations .
ΝΟΤΕ
All ιπυατυ reme ηττ are made with reference to ε1ιατυτ
gro un d.
5.3 .1
+18 VO LT AD JUSTMENT
Connect tile .
d
igital voltmeter to t h e o r ange +18 volt line
on Pin 3 of modu le M30 1 . Set +18 V Adi on the Power
Supply to produce +18 .00 V-
5 .3-2
18 VO L T CHE CK
Connect the
d
igital voltmeter to the yellow -18 volt line
on pin 4 of mo dule M30 1, Set -18 V A dj on
t
he
P
ower
Supply to
p
ro duce -18.00 V .
5 .3 .3
+7 .3VOLT CHECK
Conn ect t h e
d
igital volt meter to
t
he green +7 .3 volt line
on pin 2 of module Μ30-1 .
T
h e rea d ing mu st be +7 .3 V
1150 mV .
5.3 .4
C R YSTA L FR EQ UENCY ADJUSTMENT Μ 30-1
Connect
α
f
re
qu
ency
counter
wit
h a
50
ohm input to the
instrument R F connecto r. Set the signal generator
L
ever/
I nd icator switches to α
h
ig h
f
requency whic h is withi n t h e
5-3
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