Left Margin Drifting Problem - OKIDATA ML590 Service Manual

Left Margin Drifting Problem

NOTE:
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To correct a problem with the left margin drifting during print operations, follow this
procedure.
1. Manually slide the carriage assembly back and forth along the full length of the carriage shaft.
2. Check for "drag" caused by the ribbon, a dirty space rack, or other obstructions.
3. If you suspect that the ribbon is causing movement problems, check the movement of the
carriage assembly with the ribbon removed OR with a new ribbon installed.
4. Check the contact between the carriage frame and the space motor board assembly.
5. Contact is made at the front edge of the board.
6. Any gap will keep the space motor gear from fully engaging with the space rack. This will result
in slippage problems, which will affect spacing operations.
7. Check the printhead cable connections between the main control board and the space motor.
Solid contact MUST BE made at all connections or print problems will occur.
8. Check the condition of the printhead cable. If it is broken, torn, or sharply bent, replace the
cable.
9. If the problem continues, check the parts listed below (in the order given). Replace the
suspected part. Be sure to test the printer after replacing each part.
1.
2.
3.
4.
5.
10. If the problem continues, check all assemblies and connections. Then, contact Okidata
Technical Information for further assistance.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Technical Service Bulletin 3309
Carriage: Frame Set
Motor: Space
Rack: Space
Cable: Printhead
Board: Main Control
Service Guide ML590/ML591
Chapter 4 Failure & Repair Analysis
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Page: 152