Bizhub C500 Pro SC 45-20

[Stirton.M]

According to service manual, 29-19 refers to the following....

F29-19
Dot diameter adjustment control /Y resulted in an abnormality.
Potential problem areas:
Printer control board (PRCB)
Drum potential sensor board /Y (DRPSB Y)
Drum potential sensor /Y (DRPS Y)

You could try going into process adjust and perform a drum potential adjustment, that may correct the problem. If not, then look at the following....

Basic checks are to verify the potential sensor is clean. See first attached file for location of these sensors. Illustration in picture shows a long plastic guide just above the metal plates between the developer units and the drum units. There is a wire harness that sits inside the guide and comes through the front side of the process unit and plugs into the drum potential board that is under the black plastic cover on the front side of the process carriage. See attached file two for the location of those boards.

If everything looks clean, relative to what RRodgers is speaking about, you may have to look further by swapping the yellow sensor unit with another colour. Leave the boards where they are for now, just swap the sensor. If you get a service code 29-20, and you swapped with magenta, the sensor is at fault. Code 29-21 is cyan and 29-22 is black, for reference if you swapped yellow with either of these two sensors.

If the code remains at 29-19, then swap the sensor board on the front of the carriage with another colour. If the problem moves to the swapped colour, then the sensor board itself is at fault.

If the code never changes at all and you have verified everything is nice and clean and checked that everything is sitting correctly, the likely it is the PRCB that is damaged. You will have to swap out the board with another one and/or send the board in for repair.

[scallanjoe@yahoo.com]

c500/ code 45-20

Kindly help me for the call code?
What is the suspected part and to be done?

clean ps8 & ps9 pull out image assy// look on left side sensor assy can be removed easly if you have
long arms

[Streamline]

Thanks Mike,
Can you tell me where the slit glasses are? I can't seem to find them in the service manual.

[Stirton.M]

The slit glass themselves are located on the main frame. If you have the process unit pushed in and locked, look to the right side of the developer units, you will see 4 black plastic tabs poking out. In the previous response of mine showing the images, the first image, on the right side of the picture, you can see a couple of those black tabs on the mainbody frame. You can also see them in the last image of my first post, again on the right side of the image. Pulling these straight out will reveal the slit glass. Try not to scratch or damage these. Do not use any chemicals to clean them. Lint free cloth is the best for cleaning, just ensure they are dust free.

If you are still having problems, post a scanned image of all 4 half tones. I recommend pattern 53 at a density of 120-150 for all colours. In the case of yellow, I recommend you blend yellow with another cyan or magenta (or coloured paper) so any defects in yellow can be seen. Usually I make yellow dominant...150 for yellow, 100 for the blended second colour. Use largest format possible, preferably 13x19. Paper thickness is not important.

[hambergm]

Thanks for the info, it was really helpful

I ran the auto color adjustment and received an error 2. Can someone detail the process for removing the process unit and replacing the color registration unit? In the 30 minutes I got to look at the machine I wasn't able to figure out how to remove the process unit from the rollers.

Can you also provide how to change out a drum?

If anyone has a copy of the repair manual for this unit, please contact me...

[scallanjoe@yahoo.com]

have a s/m

Thanks for the info, it was really helpful

I ran the auto color adjustment and received an error 2. Can someone detail the process for removing the process unit and replacing the color registration unit? In the 30 minutes I got to look at the machine I wasn't able to figure out how to remove the process unit from the rollers.

Can you also provide how to change out a drum?

If anyone has a copy of the repair manual for this unit, please contact me...

i have a C500 s/m 6.91 mb how do you want it sent

[Nisar235]

hi
you must have to replace the transfer belt unit your problem will remove incase it did not remove then also replace the all developing units and this way your problem will remove permanently.
regards,
Nisar Khan,
Pakistan

[Stirton.M]

hi
you must have to replace the transfer belt unit your problem will remove incase it did not remove then also replace the all developing units and this way your problem will remove permanently.
regards,
Nisar Khan,
Pakistan

Perhaps you should be paying attention to the WHOLE thread of the conversation. This is the third post I noticed you came in and failed at paying attention to that. Replacement of the belt or the developing units has been ruled out.

[anothertech]

When I get this code, I go in and turn off color reg adjustment, then run the machine to see if any sc29 codes pop up. You have said a 29 code for yellow popped up, try swapping the drum and charge corona with another color to see if the code changes to the other color, and if you have not already changed the developer, you should change all four regardless of the copy count. These are great machines, but you've got to PM them.