Diagnosing 810 printer problems:

Problem/customer complaint	Possible corrective action
1. Weak or no paper advance.	1st: Replace driver board. 2nd: Replace paper advance motor.
2. Margins drift. 3. Printhead jerks then stops.	Replace carriage motor.
4. Very slow printhead movement.	1st: Clean carriage bar with alcohol. (Never lubricate or use oil.) 2nd: Replace carriage motor.
5. Won't hold programmed form-length.	1st: Replace battery on processor board and reprogram. 2nd: Replace processor's VFC kit. 3rd. Replace control panel.
6. Ribbon not turning.	1st: Move slotted actuator post back and forth a few times to reseat switch. 2nd: Replace ribbon drive assembly. 3rd: Replace driver board.
7. Won't communicate or printing garbage.	1st: Check all interface cables and connections. 2nd: Check pencil switch set-up parameters. 3rd: Replace processor.

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