TM5-1260-206-34
Table 3-2.
DAC Troubleshooting Procedures - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
DIGITAL DISPLAY READ-OUT DOES NOT ZERO
9.
Step 1.
Remove DAC top and bottom cover plates. Using an oscillo-
scope, perform the following measurements.
Step 2.
Check continuity between card D, pins D9, D25, and D32, and
cards B and C. (See table 3-11 and FO-8.)
Replace or repair faulty wire.
Step 3.
Check that malfunction is corrected.
If not, refer faulty DAC to depot maintenance personnel.
10.
X-AXIS ENCODER OUTPUT MISSING OR INCORRECT
Step 1.
Remove DAC top and bottom cover plates. Using an oscillo-
scope, perform the following measurements. (See table 3-11. )
NORMAL
ROTATE X-AXIS
REMARKS
PIN NO.
PARALLAX ADJUST
INDICATION
If pulses are not
pulses
G43
clockwise
resent, replace
G53
counterclockwise
G card.
If pulses are not
clockwise
F45
present, replace
F47
counterclockwise
F card.
Step 2.
Using an oscilloscope, perform the following measurement.
3-8
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