Troubleshooting
Engine Test
Printing an Engine Test - LaserJet 4P/4MP
On the LaserJet 4P/4MP, the printer’s covers and the Formatter
PCA must be removed prior to printing an Engine Test. Since the
covers will be removed, the printer’s safety interlocks must be
defeated to provide power for running the Engine Test.
To defeat the interlocks and set-up the printer for an Engine Test:
1,
2.
3.
4.
Remove the printer cover, the Formatter Shield and the
Formatter PCA (see Chapter 6).
Install the paper cassette (with paper loaded).
Install a toner cartridge in the ptinter. Lay a large sheet of
thick paper over the toner cartridge and Laser/Scanner
Assembly to block out ambient room light (this will prevent
black streaks on the printed output).
On the to~ of the winter, use a ~iece of tape to hold down the
Top Door”Plunge;(sho~ in Fi&e 7-5). -
9
$$
/~{l$$;~;%l%wn
1
even with chassis
TOEIRail to defeat.)
c
A$~inbly
Figure7’-5 Defealingthe Top Ek90rPh,mgw (Law!kfi 4P/4MP)
7-37
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