HP Color LaserJet MFP E77822

Skewed image

 

Step	Cause	Action
1	Is the tray properly installed?	Reinstall the tray correctly.
2	Is too much paper loaded in the tray?	Remove some paper.
3	Are the paper guides properly set?	Adjust the paper guides.
4	Is the surface of the pickup/reverse/feed roller dirty?	Clean or replace the contaminated roller.
5	Is the Flow ADF installed and adjusted properly?	Reinstall the Flow ADF unit. Adjust the Flow ADF skew.
6	Is the intermediate transfer belt installed properly?	Reinstall the ITB unit.

Blank copy

 

Step	Cause	Action
1	Laser scanner assembly operation error	Check laser scanner assembly connections
2	All connections on the HVPS board are connected correctly	Reconnect all connections
3	Check if the related parts are damaged or broken	Replace the HVPS board, engine controller board, or laser scanner assembly
4	Check the connection between the scan joint board and the engine controller board	Reconnect the harness If the connection is correct, replace the engine controller board

Poor fusing performance

 

Step	Cause	Action
1	Check the paper type. Depending on what type of paper is used, print speed varies. - Plain (71~90g/), Thick (91~105g/): Full Speed - Heavy weight (106~175g/): Half speed - Envelope (75~90 g/), Label (120~150 g/): Half speed.	Check that the paper type displayed on the control panel is the same type of paper being used for the print job.
2	The fuser unit is worn out.	Replace the fuser unit.
3	Check the surface of the fuser belt and pressure roller for scratches.	Replace the fuser unit.
4	Check the temperature control system for problems. - Thermistor is broken or operates abnormally - Halogen lamp is broken or operates abnormally	Check the non-contact thermistor sensor. Check the halogen lamp. If parts are broken, replace the broken parts or the Fuser unit.
5	Check if the pressure control system operates properly.	Check the pressure control system. If the problem persists, replace the fuser unit.
6	Paper is wrapped on the heating roller.	Remove the wrapped paper and print a test page. If the problem persists, replace the Fuser unit.

Stain on back of paper

 

Step	Cause	Action
1	The transfer roller is dirty or worn out.	Clean or replace the transfer roller assembly.
2	There is any stain caused by poor cleaning on the ITB unit.	Clean the ITB. If the problem persists, replace the ITB unit.
3	The ITB cleaning blade is not in proper contact with the ITB.	Take off the ITB and check that the ITB cleaning blade pressure spring and the pressure hook are installed correctly.
4	The fuser belt and pressure roller are dirty.	Clean the fuser belt and pressure roller.
5	Pressure roller surface is damaged.	Replace the fuser unit.