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Section V
Maintenance
Table 5-3. Electrical Performance Checks and Adjustments (cant.)
Model 7754A/74l4A
5. Signal Waveform Measurements.
a. Press Recorder POWER switch to remove
power (OFF).
b. Remove Driver Amplifier Assembly (07754-
60170) from channel to be tested.
c. Install extender board (07754-00920) and
plastic support (07754-00900) on Driver
Amplifier Assembly.
d. Install extender board, with Driver attached,
to Recorder connector from which Driver
was removed.
e. Press Recorder POWER switch to apply power
(0 ).
f; Adjust Function Generator output to 50 Hz
sine wave.
g. Set scope controls as follows:
Switch
Position
Scope must show pattern same as "B" in
following photo:
j
h. Connect scope between TPI (Figure 5-5)
and signal ground.
i. Push Recorder SPEED button for 2.5 MM/
SEC.
j. Set MODE switch to RUN.
k. Adjust Function Generator amplitude for full
scale stylus deflection.
1. Scope must show a pattern as in the following
photograph:
q. Turn Function Generator amplitude control
to produce full scale deflection on chart with-
out limiting.
r.
Set Recorder MODE switch to STDBY.
s. Connect scope between TP3 of Driver Ampli-
fier and signal ground, and set Scope controls
as follows:
INPUT
SWEEP
SENS
AC
5 MSEC/CM
0.5V/CM
Switch
INPUT
SWEEP
SENS
Position
AC
5 MSEC/CM
lV/CM
j
5-8
m. Connect scope between TP2 and signal
ground.
n. Set scope SE S control to 10V/CM.
o. Scope must show pattern same as "A" in fol-
lowing photo.
p. Turn Function Generator amplitude control
clockwise to cause limiters to limit signal.
Scope should show pattern as in following
photo:
t. Connect scope between TP4 and signal ground,
and set scope SENS to 5V/CM. Scope must
show pattern as in following photo:
07754-1
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