The proper value cannot be figured out within the specified time by the correction of the patch density correction /K. Or, the proper value of the developing DC output is 0 or lower.
Associated Parts:
• Printer control board
(PRCB)
• Developing unit /K
• IDC sensor (IDCS)
• IDC shutter solenoid
(SD3)
Remove the black (K) Drum. behind and toward the front is a silver/chrome looking thin bar with a tine square that square is a sensor clean it or replace the drum (switch different color see if changes codes) or switch out sensor with a different one each drum has one when was the last developer was replaced for black getting close to a PM???
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f
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