Printer and Photocopier Troubleshooting and Repair Collection : HP LaserJet IIIP power up problems      
 Copyright © 1994-2007, Samuel M. Goldwasser. All Rights Reserved. Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied: 1. This notice is included in its entirety at the beginning. 2. There is no charge except to cover the costs of copying. I may be contacted via the Sci.Electronics.Repair FAQ (www.repairfaq.org) Email Links Page.

     << Paper jams on HP LaserJet.. |  Index  | HP LaserJet IIIP - error .. >>

HP LaserJet IIIP power up problems

"I have a HP Laser Jet IIIp, The problem is when it is switched on, the printer can do one of two things; the panel lights up and displays 05 Self Test and then switches off after around 3 Seconds, and other times nothing happens at all."

(From: Pete (PTCull@lbl.gov).)

If you have a voltmeter, J212 on the DC Controller is a good place to start checking. Blue wires are earth/ground, brown is +5 VDC, orange is +12VDC, and the red wires have +24VDC.

However, it sounds like a nice time for known good spares or another known good LX engine to borrow known good assemblies from.