C2557 (bizhub 650i/550i/450i)

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Trouble typeC2557: Abnormally low toner density detected black TCR sensor
RankB
Trouble detection conditionWhen sampling data is determined in TC ratio calculation control, TCR sensor output is higher than a predetermined value for a predetermined number of times in a row even though there is toner in the sub hopper.
Trouble isolation–
Relevant electrical parts-Developing unit/K
-Toner cartridge/KPH unit
-Toner empty sensor/K (PS31)
-Toner cartridge motor/K (M25)
-Toner supply motor/K (M6)
-Expansion control board (EXCB)
-CPU board (CPUB)
-Base board (BASEB)

Procedure

  1. Perform image troubleshooting procedure if image density is low.
  2. Reinstall the developing unit/K.
  3. Reinstall the toner cartridge/K.
  4. Check the connector between the developing unit/K-relay CN252-relay CN25-EXCB CN4EX for proper connection and correct as necessary.
  5. Check the connector between EXCB CN1EX-BASEB CN11E for proper connection and correct as necessary.
  6. Check the connector between EXCB CN2EX-BASEB CN12E for proper connection and correct as necessary.
  7. Check CPUB for proper installation and correct as necessary.
  8. M25 operation check
    • Control signal: EXCB CN11EX-1 to 4
    • Location of electrical component: 15-P
  9. M6 operation check
    • Control signal: EXCB CN10EX-16 to 19
    • Location of electrical component: 23-P
  10. If the toner empty sensor and its surroundings inside the sub hopper are dirtied with toner, clean them.
  11. Replace the developing unit/K. (Part# ACV803D)
  12. Replace EXCB. (Part# AC74H00501)
  13. Replace CPUB.
    650i/550i(Part# AC74H02P03)
    450i (Part# AC76H02P02)
  14. Replace BASEB. (Part# AC74H02101)

(Link to the Field Service Manual)