P-9 (bizhub 750i)

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Contents

Malfunction typeDrum/Development unit (K) failure
Malfunction codeP-9
Malfunction detection timing-All density readings taken from the density pattern produced on the transfer belt are equal or under the predetermined value during max. density adjustment (Vg/Vdc adjustment).

-All density readings taken from the density pattern produced on the transfer belt are equal or more the predetermined value during max. density adjustment (Vg/Vdc adjustment).
Relevant parts-Drum unit/K
-Developing unit/K
-IDC sensor/Fr (IDCS/Fr)
-IDC sensor/Rr (IDCS/Rr)
-Base board (BASEB)
-High voltage unit (HV)
-Transfer belt unit

Procedure

  1. Check the setting value in [Max Image Density Adj] of [Service Mode] -> [Imaging Process Adjustment] and, if it is negative, readjust.
  2. Check the drive transmission portion of the drum/developing unit and correct as necessary.
  3. Clean the IDC sensor/Fr (IDCS/Fr) or IDC sensor/Rr (IDCS/Rr) window if dirty.
  4. Clean the contact of the drum/developing unit connector if dirty.
  5. Check the connector between HV CN1-BASEB CN26E, HV CN2-BASEB CN21E for proper connection.
  6. Replace the drum unit. (Part# ACV80RE)
  7. Replace the developing unit. (Part# ACV803D)
  8. Replace the transfer belt unit. (Part# AA2JR73100)
  9. Replace HV. (Part# ACV7M40600)
  10. Replace BASEB. (Part# ACV7H02101)

(Link to the Field Service Manual)