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P-5, P-28 (bizhub 750i)

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Malfunction typeIDC sensor/Fr failure, IDC sensor/Rr failure
Malfunction codeP-5, P-28
Malfunction detection timing-During IDC sensor light intensity correction, output voltage detected for all eight sample patterns are 3.35 V or more.

-During IDC sensor light intensity correction, sensor output voltage for light intensity selected after the correction is under 0.7 V.

-During IDC base surface detective control, sensor output voltage detected is under 0.7 V or over 3.35V.

-During image stabilization (gamma correction control), detected output value for IDC sensor did not go below threshold (half the value of what is detected by IDC sensor on the belt surface) for three consecutive times (position of the pattern end is not detected).

-During image stabilization (gamma correction control), sensor’s output value for hyper 0 gradation after the primary approximation is half the detection level on the belt surface or under.
Relevant parts-IDC sensor/Fr (IDCS/Fr)
-IDC sensor/Rr (IDCS/Rr)
-High voltage unit (HV)
-Transfer belt unit
-Base board (BASEB)

Procedure

  1. Wipe clean the surface of the transfer belt with a soft cloth, if it is dirty.
  2. Replace the transfer belt unit if the transfer belt is damaged.
    (Part# AA2JR73100)
  3. Reinstall or reconnect IDCS/Fr, connectors connecting between IDCS/Fr-relay CN77-BASEB CN15E, if any of the foregoing parts is installed or connected improperly.
  4. Reinstall or reconnect IDCS/Rr, connectors connecting between IDCS/Rr-relay CN77-BASEB CN15E, if any of the foregoing parts is installed or connected improperly.
  5. Clean IDCS/Fr or IDCS/Rr if it is dirty.
  6. Check the connector between HV CN1-BASEB CN26E, HV CN2-BASEB CN21E for proper connection.
  7. Open/close the lower front door, run an image stabilization sequence, and select [State Confirmation] -> [Level History 1] to check the IDC value.
  8. IDC1: IDCS/Fr
  9. IDC2: IDCS/Rr
  10. If the value is 1.0 V or less, replace IDCS/Fr or IDCS/Rr.
  11. Replace BASEB. (Part# ACV7H02101)

(Link to the Field Service Manual)

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