HP 2100 Service Manual - Page 131

Gray Background (continued) Possible Cause Action Poor contact between Check developer bias spring. the primary bias contact on the Engine Controller Assembly and toner cartridge contact. Horizontal Black Lines Possible Cause Action Toner Cartridge not Remove the Cartridge and reinsert it. seated properly. Repetitive defect. If Refer to "Repetitive Defect Ruler" (page 127) to the lines are repeated isolate and fix the problem at a consistent interval down the page, this is a repetitive defect. Fuser entrance guide Clean the guide is dirty Fuser Film Unit is scarred Replace the Fuser FIlm Unit after determining and removing the cause of the scarring Toner Cartridge is scarred. Replace the Cartridge. Horizontal Dots Possible Cause Action Deformed or Replace the Transfer Roller. deteriorated Transfer Roller. Dirty static eliminator Clean the static eliminator. teeth. Poor contact between Inspect the contacts. If parts are damaged or the Static Eliminator deformed, replace them. and the Engine Controller Assembly. Poor contact between Inspect the contacts. If parts are damaged or the transfer roller deformed, replace them. contact on the Engine Controller Assembly and the transfer charging roller shaft contact Defective Engine Replace the Engine Controller Assembly and the Controller Assembly. Intermediate PCB. C4170-90959 Image Formation Troubleshooting 121