C5501 (bizhub 950i/850i)

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Trouble typeC5501: AC signal abnormality
RankC
Trouble detection conditionThe zero cross signal is not input during fusing phase control.
Trouble isolation–
Relevant electrical parts– Fusing unit
– DC power supply unit/1 (DCPU/1)
– CPU board (CPUB)
– Base board (BASEB)

Procedure

  1. Check the fusing unit for correct installation (whether it is secured in position).
  2. Check the connector between the fusing unit-relay CN807-BASEB CN30E for proper connection and correct as necessary.
  3. Check the connector between DCPU/1 CN7-BASEB CN31E for proper connection and correct as necessary.
  4. Check CPUB for proper installation and correct as necessary.
  5. Replace the fusing unit.
  6. Replace CPUB.
  7. Replace BASEB.
  8. Replace DCPU/1.

(Link to the Field Service Manual)