HP 8550 Service Manual - Page 484
Printer Family Service Manual., Table 91., Repetitive image defects
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Printer ITD cleaning 10 roller locking/ unlocking solenoid (SL1) ITD cleaning 11 roller locking/ unlocking solenoid (SL1) dc controller 12 PCB Are connector J674 on the NO sub-relay PCB and connector J227 on the dc controller PCB connected securely? Disconnect connector NO J674 of the solenoid, and measure the voltage between connectors J674- 1 (CLNRON) and J674-2 (+24 UH) on the harness YES side. Is it about 85Ω? Connect the connectors securely. Replace the ITD cleaning roller locking/unlocking (SL21) solenoid. Replace the dc controller PCB The following table may be useful in isolating repetitive image defects to the appropriate print engine part. For more information about repetitive image defects for the printer, see the HP Color LaserJet 8500/8550 Printer Family Service Manual. Table 91. Repetitive image defects Problem part Cassette pick-up roller Separation roller Feeding roller 1 Feeding roller 2 Multi-feeder pick-up roller Registration roller Primary charging roller Photosensitive drum Developing cylinder Upper fusing roller Power fusing roller ITD cleaning roller Diameter* (mm) 24 24 24 38 30 16 14 62 21 46 46 18 Image interval* (mm) 75 75 75 119 94 52 44 195 66 144 144 57 Development Soiling White spot Soiled back * * * * * * * * * * * * * * * Faulty fusing * * 482 Chapter 7 - Troubleshooting EN