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Section V
Main tenance
EXTENDER BOARD
(Table 5-1)
TEST SUPPORT
(FIGURE 5-2)
DRIVER AMPL!FIER OR REGULATOR/
OSCI LLATOR ASSEMBLY (TYPICAL)
Model 7754A/7414A
•
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Figure 5-3. Driver Amplifier and Regulator/Oscillator Test
b.
Check the spacing of the timing marks with a milli-
meter scale. They should be 25 mm
±
1
%.
Check again at
100 MM/SEC and 5 MM/SEC speeds, allowing a maximum
error of 1
%.
Under certain humid conditions, if the paper brake is set
too tightly, the paper will stretch slightly on the paper
table, resulting in false timing.
5-29. Stylus Adjustments.
5-30. The stylus pressure, mechanical centering and
parallax may be adjusted. Mechanical stops are adjusted as
part of the electrical maintenance procedures, as is galva-
nometer sensitivity, but the galvanometer itself has no
adjustments.
5-12
5-31. STYLUS PRESSURE ADJUSTMENT. Stylus pres-
sure must be checked at the tip of the stylus only, for
accurate readings. For access to the stylus tips, four holes
are provided in the front top bar. See Figure 5-8 and pro-
ceed as follows:
a.
Gain access to top of Recorder and remove painted
metal cross bar cover to expose four holes for stylus pres-
sure tester.
b.
Run Recorder at 5 mm/sec. Hook tip of accessory
Stylus Pressure Tester 14023A under edge of stylus under
test.
c.
lift tester and stylus. When stylus stops writing,
07754-1
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