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5-1 .
I NTR OD UCTIO N .
5-2 .
This sect ion co nta in s ma in ten ance and serv ice inform atio n, incl udi ng α table of reco mm ended test
equipment, α m i nimum perform a nce chec k, adjust ments, and troubleshooti ng
p
rocedu res .
5-3.
Test
E
quipment .
511 .
T
ab le 5-1 l ists the test equipment reco mm ended for maintaining and ch ec king t h e perform ance of
t
he
59313Α .
T
est equ ipm ent having equiva lent characteristics may be substituted for
t
he eq uipm ent li sted .
5-5.
Disassem bly .
SECTIO N V
MAI NT EN AN C E
5-6 .
Th e
M
odel 59313Α Α/D Conve rter may be disasse mbled as foll ows (Figur e 5-1) :
α.
Remove the to p, botto m, and le ft side covers .
b .
(1)
Remove
f
our sc r ews (Α) securin g the upper boar d asse mbly .
Sect
i
o
n
V -
Ma
in
te
n
a
n
ce
M
odel 59313Α
(2)
B y the transformer there is α pl ace (Β) w h e re the forefinger can reach under both Top and Mi dd le
circuit boar ds . Pull up with the
f
inge r, thereby disengaging the connector .
c.
(1)
Ca refull y
r
emove th e eight
w
ires attached to the four in put cables (C) fro m the ρε boar d pins, the
four pow e r
a
nd ta lk er lamp wir es ac r oss the front of
t
he l owe r boar d (D), and the six exte rnal-sta rt, cali brat ion
swi tc h, and ground wir es along the r ea r of the board (Ε) .
(2)
R emove plugs Ρ6 and Ρ8 co nn ected to the rea r
o
f the board.
d.
Stand the inst rum ent on
i
ts left side (tra nsform er up), and remove five sc rews designated (F).
e.
Stand the inst rume nt on its right s ide (transform e r down).
Remove two sc rews (G) from the to p
o
f the board.
(2)
Remove two sc rews (Η) fr o m
t
he bottom
o
f
t
he board.
Remove two screws (Ι) holding the transfor m er.
(4)
R em ove one screw (J) hold ing the
p
ri mary power cable.
(5)
Sw in g the transfor mer
o
ut of
t
he instrument (Figur e 5-1, p art 6), and
r
est it on the ta ble surface,
m
aking sure that t h e prim ary wir es are not pull ed or broken.
f .
W
ith t h e instrument on
i
ts left side again , and with the co mp one n t s ide o f the ρε board facing you:
(1)
Gras p
t
he right sc rew tab (Κ) with yo ur right
h
and.
(2)
Reach aroun d and grasp the
l
eft lower edge of t he pc board fr om behind (L).
(3)
Lifting up on the tab and pc board, slide the boa r d to the
l
eft.
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