Xerox WorkCentre 7556

This RAP troubleshoots parts failure or contamination on the LPH surface.

At Cin50% and Cin30%, the lines in the process direction have reversed black and white colors. Width is approximately 1mm.

Initial Actions

1. Check customer print to verify 1mm lines or Print Cin50% and Cin30% half tones using print test pattern -13 (dC612), and check for a 1mm line as in Figure 1.
2. Check fault history for any LPH (chain 061) fault(s). Resolve any faults.
3. Replace the paper in use with fresh, dry paper of the correct specification.
4. Use the LPH Cleaner to clean the LPH surface (PL 2.1).
   NOTE: This must be separated from Developer trimmer jam. Do not replace the LPH without consideration.
5. Perform IQ40 Process Direction Bands, Streaks, and Smears RAP. If this does not resolve the problem, continue with this RAP.

Step	Procedure	Yes	No
1	Check power to LPH from MD PWB. There is +5v at P/J532.	7	2
2	Check power to MD PWB from MCU PWB. There is +5v at P/J452.	6	3
3	Check power from +5VDC LVPS. There is +5v at P/J510	4	Go to +5VDC Power RAP.
4	Check wire harness between the LVPS and MCU PWB for damage. Repair or replace as required (REP 9.11).
5	Check the F6 2A fuse located on the MCU PWB (PL 18.2A). If check is ok. Replace the MCU PWB (REP 1.4). If check reveals blown F6 2A fuse. Replace the fuse.
6	Replace the MD PWB (REP 1.5).
7	Go to IQ45.