IBM 6400 Maintenance Information Manual page 77

Operator Panel
Message
057 CLOSE PLATEN
Table 4. Message List
Explanation
The forms thickness
lever is open.
Corrective Action
1. Load paper. Close the forms thickness
lever. If message does not clear, go to
the next step.
2. Power off the printer. Remove the paper
guide assembly or pedestal top cover.
Disconnect connector P107 from the
CMX controller board. Check continuity of
the platen interlock switch cable from
P107/PLO to the switch. Replace the
platen interlock switch assembly if it fails
the continuity test. (Refer to Appendix A,
Switch Assembly, Platen Interlock.)
3. Check that the platen interlock switch is
not loose.
4. Check and adjust the platen open belt.
Replace the belt if it is damaged.
5. Check the platen open pulley and the
platen pulley for looseness. Bottom out
the platen open motor pulley on the motor
shaft and torque the 1/16 inch set screw
to 9 ± 2 inch-pounds (1.02 ± 0.23 N•m).
Tighten the 7/64 inch setscrew in the
platen shaft pulley, then open and close
the forms thickness lever and check that
the platen pulley setscrew does not hit
the left ribbon guide.
6. Disconnect connector P106 from the
CMX controller board. Check the
resistance of connector P106/PLAT M.
(Refer to the Main Wire Harness Test
Tables on page 306.) Replace the platen
open motor if it fails the resistance test.
7. Run a print test. If the message appears,
replace the CMX controller board. Record
the message and return it with the
defective board.
Message List
77