Transfer Unit replacement

Run the Test Pattern. That will tell where the problem is.

In my experience, the fuser has always been the cause of the lines.

Possible remedies for weak images.
-Loose connection between transfer roller and high voltage supply unit.

-Dust in the laser beam path

-Transfer belt not contacting PCU.

Check the transfer unit.

Defective PCU. Replace the PCU.

Defective transfer roller. Repair the transfer roller.

Defective fusing unit. Replace the fusing unit.

Defective engine board. Replace the engine board.

Try doing a "stop test." Stop the print process at various stages, and see if which component creates the defect.
For instance, if a print takes 20 seconds, during the first 10 seconds, the drum is generating the image to transfer to the belt. If the image is bad on the drum, then that is your culprit. If not, then see which unit creates the problem.

Also, what color is the line?
After the unit gets to the transfer belt, you should check the transfer roller and fuser.

Whit www.iteminconline.com

SC471 is a Transfer Belt HP error. The transfer belt does not lift in the rear. The rear cam (G060 3894) slips past its locking tab on the square stepped shaft and slips off the side.
The fix: reposition the rear transfer belt lift cam to lock the tab into the square shaft. Secure the locking tab with a tie wrap.
Now this is the solution if you know what you are doing on this printer. I can not even begin to tell you in this forum how to dis-assemble the printer to get the transfer belt unit out and effect this repair. IKON is pretty pricy on labor. I would see if there is an independant guy locally that can do it. Inexpensive repair that I would charge $90 or less for. If you HAVE to call IKON then just make sure they do not try to tell you that you have to replace the transfer belt unit. This repair is all that is needed 90% of the time.
Good Luck and Thank You for using Fixya.

Causes for distortion or blurring
Cause
Solution
Transfer unit is defective
Replace the transfer unit. Calibrate the printer after
replacing the transfer unit.

Secondary-transfer roller is defective
If it does not rotate smoothly or is deformed, replace the
secondary-transfer roller.

DC controller PCB is defective
Replace the DC controller PCB. Calibrate the printer
after replacing the DC controller

One possible cause could be the transfer belt cleaning section. It can get a toner build up on the blade. Take it out and wipe the blade off. The transfer unit is above the drums and the cleaner is on the left side.

Dear try upgradiing the firmware. And if possible contact authorised service center for further assistance. Else update for further assistance

i got this info from www.partshere.com site - they have most service notes for hp printer and sell most hp parts, including maintenance kits. I hope info. bellow is helpfu.

Replacing the transfer unit
Replace the transfer unit when the printer control panel displays REPLACE TRANSFER
KIT. The image transfer kit contains a replacement transfer unit for this printer.
WARNING! Remove any jewelry or any other metal items from your body to avoid electric shock.

1. Lift the front door handle and pull down the front door.
2. Grasp the right blue handle. Press and hold down the blue button. Slightly lift the right
side of the transfer unit.
3. Grasp the left blue handle and lift to remove the transfer unit from the printer.
4. Using handles, remove the new transfer unit from the bag. Use the blue handles on both
sides to hold the transfer unit.
5. Place the new transfer unit on a flat surface. Remove the orange shipping locks.
6. Guide the left side of the transfer unit into the front door of the printer. Insert the two
pegs on the left side into the holes, and then lower the right side into the door.
7. Make sure that the blue button on the right blue handle has released (popped up). If the
button has not released, grasp the right blue handle and pull the transfer unit toward you.
8. Firmly close the front door.
9. After the front door is closed, after a short time, the printer control panel displays the
message NEW TRANSFER KIT.
10. If the message NEW TRANSFER KIT does not appear, you must reset the transfer unit
count. To reset the transfer unit count, go to step 11.
11. On the printer control panel, press to highlight YES, and then press to select it. The
transfer unit count is reset, the printer recalibrates, and then the printer is ready to use.
NOTE If the old transfer unit was not at end-of-life when it was replaced (for example, if it was
damaged), the transfer unit count must be reset using the printer control panel.
Replacing the transfer unit when it is not at end-of-life
If you replace the transfer unit when it is not at the end-of-life, for instance if it is defective,
you will need to reset the transfer unit count and then calibrate the printer, through the
control panel.


To reset the transfer unit count, do the following:

1. Press MENU to enter the MENUS.
2. Press to highlight Configure Device.
3. Press to select Configure Device.
4. Press to highlight RESETS.
5. Press to select RESETS.
6. Press to highlight RESET SUPPLIES.
7. Press to select RESET SUPPLIES.
8. Press to highlight NEW TRANSFER KIT.
9. Press to select NEW TRANSFER KIT.
10. Press to highlight YES.
11. Press to select YES.
To calibrate the printer, do the following:
1. Press MENU to enter the MENUS.
2. Press to highlight Configure Device.
3. Press to select Configure Device.
4. Press to highlight PRINT QUALITY.
5. Press to select PRINT QUALITY.
6. Press to highlight CALIBRATE NOW.
7. Press to select CALIBRATE NOW.
8. Wait for the printer to calibrate.
The transfer unit count is reset and the printer is ready to use.

see pictures on link:
http://www.partshere.com/Models/Q5990A/CLJ_3550%203500%203700Installation_n_config.PDF

Most of the time when I find this happening on a printer, not just Ricoh's it turns out to be the PCU (photo conductor unit). The color PCU is one unit and the black is a seperate unit. Hope this helps.