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HP LaserJet Quick Reference Service Manual Page 264

Volume i.
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Why does this happen? When something causes the toner cartridge to
freeze up, the shaft on the drum drive gear continues to turn for a short
period of time but the gear does not. This can later cause the toner
cartridge drum to stop turning momentarily due to slippage between the
deformed gear and the shaft (even though the rest of the printer is
functioning normally). This results in compressed print or in gaps in the
print. Once the shaft has turned, the problem may recur intermittently
even after the toner cartridge is replaced.
Replace the drum drive gear assembly, part number
Figure 9-6
Drum drive gear assembly
Figure 9-7
Good versus bad drum drive assembly
262 – Summary of service notes and technical tips
Normal Shaft
Drum Drive
Gear Assembly
(Item #10 on
figure 8-5, LaserJet
IIP/IIIP Service Manual)
Turned Shaft


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