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PROBLEM
4.
(cont)
5.
Excessive hysteresis in
45 retrace (X and Y steep
angle retrace O. K.).
6.
Calibration incorrect.
7.
High voltage ranges won't
hold calibration.
8.
X-axis arm seems to
wobble - not rigidly held.
(Slight vertical wobble at
zero end of arm is
normal.)
TABLE 7-1. 7035B TROUBLESHOOTING INDEX (Continued)
POSSIBLE CAUSE
d.
X-axis slider rod bearings too
tight.
e.
Insufficient backlash in gears
(too tight).
f.
Motor brushes excessively worn.
g.
Pen speed too fast. Retrace
error should be small only at pen
speeds below 1 inch/sec.
h.
Bearing in drive train faulty.
i.
Faulty neon bulb in photochopper.
j.
Excessive differential noise on
input signal.
k.
Grease on drive belt.
a.
Source impedance too high or low
(1 my/inch range only) causing
excessive phase shift in input
filter.
b.
Operating on ranges other than
calibrated positions.
c.
Phase relationship problem in
signal source.
d.
Phase adjustment (R-114) mis -
adjusted.
e.
Pen carriage wheels too loose.
a.
Calibration controls (front panel
screw driver adj) incorrectly
adjusted.
b.
Recording paper inaccurate due to
poor printing or environmental
effects.
Leakage on surface of printed
circuit board.
a.
Upper support screws (two) not
tight (see figure 5-6).
b.
X-axis slider rod bearings too
loose.
CURE
d.
Adjust slide rod bearings
(paragraph 5-85).
e.
Adjust backlash (paragraph 5-83).
f.
Replace brushes (paragraph 5-38).
g.
Decrease retrace pen
speed.
h.
Replace bearing (paragraph 5-87).
i.
Replace faulty bulb (aging not required).
j.
See Table 1-1.
k.
Clean
a.
Adjust R-114 (paragraph 5-97).
This control will adjust the phasing
nominal source impedance. Extremes
can be compensated for only by
reducing the pen speed, thereby
reducing the phase shift.
b.
Possible cures:
1.
Adjust R-114.
2.
Reduce pen speed.
c.
Examine signal source.
d.
Adjust R-114 per paragraph 5-97.
e.
Adjust pen carriage wheels
(paragraph 5-71).
a.
Calibrate unit per paragraph 5-95.
b.
Calibrate unit per paragraph 5-95.
Wash board per paragraph 5-9.
a.
Align arm and tighten (see
paragraph 5-73).
b.
Adjust slider rod bearing
(paragraph 5-85).
7-3
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Troubleshooting
