P-6, P-7, P-8, P-9 (bizhub C750i)

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Contents

Malfunction type	Drum/Development unit (C) failure, Drum/Development unit (M) failure, Drum/Development unit (Y) failure, Drum/Development unit (K) failure
Malfunction code	P-6, P-7, P-8, P-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/Y,M,C,K -Developing unit/Y,M,C,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. (CMY ACV80TE / K Part# ACV80RE)
7. Replace the developing unit. (C Part# ACV80KD, M Part# ACV80ED, Y Part# ACV808D, K Part# ACV803D)
8. Replace the transfer belt unit. (Part# AA2JR73100)
9. Replace HV. (Part# ACKNM40600)
10. Replace BASEB. (Part# ACKNH02101)

(Link to the Field Service Manual)