Problem/customer complaint	Possible corrective action
1. Doesn't see paper loaded/installed. 2. Printhead slams and grinds. (No home position) 3. Gets margin errors.	1st: Clean and/or replace optical sensor. 2nd: Replace upper/right printhead cable.
4. Paper jamming under printhead.	1st: Check printhead shield for bends or rough edges. (Replace if necessary.) 2nd: Check for proper mounting of optical sensor. 3rd: Clean and/or replace optical sensor. 4th: Clean/replace lower rollers (8930 only).
5. No carriage (printhead) movement. 6. No pins firing on printhead. (No dots on paper/all pins dead)	Replace driver board.
7. No paper advance.	1st: Replace driver board. 2nd: 8930 only: check setup for tractor feed enabled.
8. Printer shuts down (powers off) after 3-4 seconds.	1st: Remove power supply from printer and power up separately. Observe the green LED: ON - Replace driver board. OFF - Replace power supply
9. Won't communicate with host or prints garbage.	1st: Check all setup parameters and interface cables. 2nd: Replace logic board.
10. Some pins not firing.	1st: Replace printhead. 2nd: Replace upper and/or lower printhead cable 3rd: Replace driver board.
11. Touch pad inoperable. No display or partial display.	1st: Replace control panel.
12. No ribbon advance.	1st: Replace ribbon tray assembly.