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HP LaserJet Quick Reference Service Manual: Blank Display

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89 PostScript ROM Failure
All Printers (except 6L and 5L)
The PostScript ROMs have bent or broken pins.
Inspect the PostScript ROMs/SIMM for bent or broken pins.
The ROMs/SIMM are improperly located.
– Check that the ROMs/SIMM are in the correct location and are
oriented properly.
A temporary error has occurred.
– Power cycle the printer.
The PostScript ROMs/SIMM are defective.

Blank Display

All Printers
There is no power.
– Check the AC and DC voltages.
The display panel, related cabling, or drive circuitry is defective.
– Check the input voltages that illuminate the display panel.
The display, cable, formatter PCA, or DC controller is faulty.
There is no power.
– Verify the input power, and then check CB101 and F101.
The control panel or formatter PCA is defective.
– Print an engine test print; if it is satisfactory, replace the control
panel and then replace the formatter PCA.
68 – Control panel messages


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