First Check:. 1.) Switch off the printer and disconnect the power cord. ….Comment: The above described repair also helps if the ?50 SERVICE? error is

Troubleshooting: HP LaserJet III Malfunction „50 SERVICE“ Veion Info: This is the second, optimized veion of the troubleshooting description „HP-LaserJet-III_Repair.doc.pdf“ dated mid 2003. Helping Internet Links: Additional information concerning this item can be found in the Internet at the following links: http://www.johannes-schubert.de/LaserDrucker/seiten/index.htm http://carnot.pathology.ubc.ca/laserjetiii.html http://carnot.pathology.ubc.ca/fusercon.pdf http://www.mxbtv.de/hp/hp.htm Error „50 Service“: If the HP LaserJet III printer shows „50 SERVICE“ after power up and the fuser is o.k. … then maybe the „AC Driver / Safety Circuit“ board of the „AC Power Module“ is defect. This PCB with part number „RG1- 1438“ is made from cheap PCB base material which can render a conductive path between adjacent feedthrough holes if it is old or was over heated. Fit Check: 1.) Switch off the printer and disconnect the power cord. 2.) Check the fuser module (see below) or replace it by a functioning one. 3.) If this does not help then replace

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