IBM 6400 Maintenance Information Manual page 125

Symptom
Paper feeds poorly
Printer does not print
self tests
Table 5. General Symptom List
1. Check the forms thickness lever: if it is set too tightly paper
feeding can be affected. Set the forms thickness lever to match
the thickness of the paper being used.
2. Power off the printer. Remove paper. Inspect the paper feed
path for obstructions that could snag paper. Clear paper feed
path of any obstructions.
3. Inspect the tractors and tractor door springs for damage or
excessive wear. If either tractor is damaged or excessively worn,
replace both tractor assemblies.
4. Check the paper feed motor pulley for looseness. Hold the collar
snug against the motor pulley and torque the 7/64 inch setscrew
to 25 ± 2 inch-pounds (2.82 ± 0.23 N•m).
5. Check and adjust the paper feed timing belt. Replace the belt if it
is damaged.
6. Check and adjust the platen gap.
7. Remove the paper guide assembly or pedestal top cover. Make
sure connector P107/PAPR M is fully seated in connector J107
on the CMX controller board.
8. Power on the printer. Load paper. Press Form Feed and View
several times and check that paper moves in both directions.
Replace the paper feed motor if paper does not move in both
directions.
9. Power on the printer. Press Form Feed and View several times
and check that paper moves in both directions. Replace the
CMX controller board if paper does not move in both directions.
1. Power off the printer. Remove the paper guide assembly or
pedestal top cover. Disconnect the control panel cable from
connector J110 on the CMX controller board. Disconnect the
control panel cable from the control panel. Check continuity of
the control panel cable assembly. Replace the control panel
cable assembly if it fails continuity test.
2. Connect the control panel cable assembly to J110 on the CMX
controller board and to the control panel. Power on the printer.
Load paper. Run a self test. If the self test does not run, replace
the control panel assembly.
3. Power on the printer. Run a self test. If the self test does not run,
replace the CMX controller board.
General Symptom List
Corrective Action
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