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SERVICE SHEET 3 (Cont' d)
DC Amplifier and Servo Amplifier
M
easure the do inpu t and
o
ut put
v
oltages .
V
erify
t
hat the a mpli-
fie r
o
utputs
r
es pond properly to t he inputs.
F
or
t
roubleshoot ing
operational amplifier s
r
efer to Ge neral Servi ce Information in
Section VIII . Α Servo Amplifi e r pr oblem will be evident o nly
during the zeroing se que nce.
Auto Zero Assembly
Th e no rm a l value
r
ange of
t
h e offset error voltage at ΤΡΑ
i
s ab out
-14 to +14 mVdc. Th e powe r sen s in g device normally
e
xhibi ts α
sli ght pos itiv e outpu t due to ambie nt temperat ure, therefore, th e
normal correction v o l tage
i
s slightly negative,
h
ence -4 mVd c.
Th e
v
oltage measure d at ΤΡΒ will provide an indicatio n
o
f h ow
lon g the ch arge
i
s retained on
A
4 A 1C1 . The
v
o ltage s ho uld
remain virtu ally un chan ged (±1 mVd c)
f
or 24 hours.
If any component on the Α4 Α1 assembly is
f
o und to be defect ive,
the entire assembly must be repl aced.
Switc h Assembly and AC Ampl/Sync Detector
Ρ/ Ο Α1 and Ρ / Ο Α4
4
SERV IC E SHEE T
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