Advertisement
Table of Contents
PROBLEM
27.
(cont)
28.
Common mode rejection
poor.
29.
One axis motor will hot
respond to input signal.
(Gears and motor
mechanically free and
electronics providing
proper drive signal to
motor).
30.
Recorder dives hard to
end of scale, will not
balance.
31.
Recorder completely
dead (Autogrip
inoperative, power neon
indicator inoperative).
32.
Recorder dead (Auto-
grip operates, power
neon indicator operates).
TABLE 7-1. 7035B TROUBLESHOOTING INDEX (Continued)
POSSIBLE CAUSE
b.
Bearing in drive train faulty.
c.
Motor brushes excessively
worn.
d.
Motor brush stuck, held off
commutator.
e.
Excessive friction.
a.
Guard strap disconnected.
b.
Guard not connected directly
to common mode source.
c.
Source impedance unbalance too
high.
a.
Motor brushes excessively worn,
b.
Motor brush stuck, held off
commutator.
a.
Faulty slidewire wiper.
b.
Open In balance circuit.
c.
Phase reversal in servo system
(common occurrence during
repair work).
a.
Fuse blown.
b.
115 volt/230 volt switch in 230
volt position when powered on
115 volts.
Neon bulbs in photochopper not lit.
Fault in neon power supply.
CURE
b.
Replace bearing
(paragraph 5-87).
c.
Replace brushes (see
paragraph 5-38).
d.
See paragraph 5-39.
e.
Clean and lubricate per
paragraphs 5-9 and 5-12.
a.
Connect strap.
b.
Remove guard strap and
connect guard input to
source.
c.
See Table 1-1.
a.
Replace brushes (see
paragraph 5-38).
b.
Free-up brush (see
paragraph 5-39).
a.
Replace wiper (see
paragraphs 5-26 and 5-30).
b.
Check
balance
fig. 7-3 to locate faulty
components.
c.
Correct by reversing wires
on servo motor.
a.
Locate and correct cause of
blown fuse. Replace fuse.
b.
Correct switch position.
Check voltages in neon
power supply.
circuits
in
7-7
Advertisement
Table of Contents
Troubleshooting
