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Seen this multiple times - lower fuser lamp is blown. VERY hard to see if the lamp is lit physically - need a dark room and looking at an odd angle.

Check with IO check 45-14 that turns on the...

Finally figured this out but it took a while. Replaced the entire fuser and the problem went away but that is really not the answer.

Fuser Exit sensor PS17 is mounted on a bracket that got bent...

Update on what we tried today...
Replaced wiring between exit assembly and printer control board
Replaced exit assembly complete
Figuring paper may be slow thru machine replaced ADU clutches,...

Machine is a C6501 with RU-504 and FS-521 Finisher. If the RU and Finisher are removed the machine runs perfectly all day. With the RU and Finisher in place it will run 10 to 20 cycles and then the...

Almost for sure the symptoms you describe are for a blown lower fuser lamp. To test start with a cold fuser as you will be using I/O check to turn on the lamps and look for a change in temperature....

Complicated problem with multiple possible causes and solutions:
Error Code C-2804 - Gamma Correction in Black Failed. Black is the most common color for this to happen. Black gets too light for...

Two questions here:
Is tray 5 grayed out on the op panel so that if you tried to say copy from there it could not be selected? If that is true then the machine may have disabled the tray by turning...

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Know this is a late reply but I do know of C5501 engines running with PF602 paper decks. Error code C-C132 is not in any code list I can find. Can you confirm the error code?

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Transfer belt is mounted correctly? Black disk on the side frame of the transfer belt unit should have its cut out pointed down when the belt is installed.

Lower transfer roller next...

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Thin white lines are almost always dirt in the laser light path, usually under the dev unit. Easiest way to take care of it is to remove the transfer belt unit and the drum. Hold a...

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C6500 type machines have a sub hopper that the toner goes in to and then the machine meters toner out of the sub hopper into the developer unit. There is a sub hopper toner sensor that the...

If the developer used in the machine is KM branded then the toner is fine. Toner and developer always must be the same stuff.
C6500 KM toner is actually the same as C6501 just the bottles are a...

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You really need to get version 70 firmware into this thing as it has some features that desensitize the machine for drum rotation errors.
dip switches to set after v70 firmware is in...

This guy got lucky fixing a 2804 code by just replacing the dev unit. Problem WAS NOT the dev unit. Machine had adjusted itself out of its ability to get back.

Yes indeed you can really put one of...

2422 means there is something wrong there and there are lots of possibilities besides just junking the unit. I would dump the unit and try fresh developer first.

Main reason to replace the Dev...

Agree about the sub hopper sensor but replacing it is tough. Most of the time (in my experience) the thing is just caked with toner.

Suggest you cut the plastic top off the sub hopper and use a...

C6500 with Fiery IC303 or IC305 controller the controller button on the machine screen is active.

C6500 with Creo IC304 the controller button stays off - this is normal.

Copier firmware current...

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Suggestions above are good as far as rollers not being under tension and the second roller worn.

Couple of other suggestions....
The exit sensor in the copier actually sends the...

Sorry I have no specific knowledge of these particular models but in general KM folders are famous for having the folding rollers with the bearings in plastic carriers. When these carriers crack the...

Have not seen video on this subject as its really complex and every job is different. Many multiple steps for setting up print jobs especially for booklets.

Suggest you look in the EFI Fiery...

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Line does not appear when you print gray scale and that is a good diagnostic. So is running test 53 set to zero.
When you print gray scale the color drums are not used, only black. Also...

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Had some trouble with doctor gaps on C6500 dev units at my company. We took apart multiple new units to see how they were set from the factory. Gap is generally about 0.8mm with a feeler...

The gray blotch is the key. Problem is indeed with the black dev unit. Some defect in the unit results in incorrect dev unit bias current and toner jumps to the transfer belt when it shouldn't.
...

Hello Rabbit -

Have not seen this on a 65hc but similar things happen on C6500 and C6501. There are mentions in the knowledge bases about a negative image problem and that seems to be what your...

Printer control boards are the same between C6500, C6501, and C6501P. The board you have will work fine. Just be sure to check the firmware version after you install it. May need to be flashed to...