Where is the IDC sensor part in the machine

P-5 Clean the front IDC sensor located under the transfer belt which will have to be removed and you will need to know how slide the sensor cover to clean it (RECOMMEND A TECH DO THIS) or the sensor is bad.
P-6 replace the cyan image unit (drum and developer)
P-7 replace the magenta image unit (drum and developer)
P-28 Clean the rear IDC sensor. (see P-5)
P-21 is registration error due to all the above!!!!!

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

Registration errors. Have tech come out clean IDC sensors and replace black i/u

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

idc sensor error. Gamma Correction abnormility
check and re-install process units
check Transfer belt cleaner and idc windows open properly.

Located under the transfer belt, which mean the belt has to be removed then must know witch accurator to depress to open the cover that protect them when the belt is not installed. One is to the rear the other is to the front. looking from thee right side of the machine

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

Sensor is not on the belt it is in the machine

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

P5 front IDC sensor failure.Wipe clean the surface of the transfer belt if it is dirty with a soft cloth or change the transfer belt unit is damaged.Reinstall or reconnect IDC sensor shutter or connector for every color unit and clean the sensors when vacuum cleaner after remove the all imaging units and the transfer belt unit.

IDC sensors are located under the transfer belt on the right sid eof the machine. Belt must be removed to clean sensors. Once belt is removed sensors are located on a black plastic frame and have slideable covers that can be moved by hand to clean sensors. There are 2 sensors one machine front and one machine rear.

Black Imaging Unit failure
• All density readings taken from the density pattern produced
on the Transfer Belt are 0.5 g/m2 (IDC Sensor
photoreceiver output) or less during max. density
adjustment (Vg/Vdc adjustment).
• All density readings taken from the density pattern produced
on the Transfer Belt are 4.5 g/m2 (IDC Sensor
Photoreceiver output) or more during max. density
adjustment (Vg/Vdc adjustment.)

Remove and reset the Black Image Unit. If this doesn't help the Image Unit may need to be replaced.

Check the following , Dirt of IDC sensor, Clean up the IDC sensor, if no then Printer control board abnormality Replace board

actually, while I was at a small engine repair shop, the nice gal there found a diagram on their computer and printed me out a page. So, i did get a paper diagram, but so far unable to find a diagram on websites that I can save on computer.