C2551, C2553, C2555, C2557 (C4651i)

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ByEric Ditges
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Contents

Trouble typeC2551: Abnormally low toner density detected cyan TCR sensorC2553: Abnormally low toner density detected magenta TCR sensorC2555: Abnormally low toner density detected yellow TCR sensorC2557: 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 lower than a predetermined value for a predetermined number of times in a row even though there is toner in the toner cartridge.
Trouble isolation–
Relevant electrical partsImaging unit/C,M,Y,KToner supply motor/YM (M4)Toner supply motor/CK (M5)CPU board (CPUB)Base board (BASEB)

Procedure

  1. Perform image troubleshooting procedure if image density is low.
  2. Reinstall the imaging unit.
  3. Check the connector between the imaging unit/C-relay CN5-BASEB CN14E for proper connection and correct as necessary. (C2551)
  4. Check the connector between the imaging unit/M-relay CN8-BASEB CN14E for proper connection and correct as necessary. (C2553)
  5. Check the connector between the imaging unit/Y-relay CN7-BASEB CN14E for proper connection and correct as necessary. (C2555)
  6. Check the connector between the imaging unit/K-relay CN6-BASEB CN14E for proper connection and correct as necessary. (C2557)
  7. Check the connector between M4-BASEB CN13E for proper connection and correct as necessary.
  8. Check the connector between M5-BASEB CN13E for proper connection and correct as necessary.
  9. Check CPUB for proper installation and correct as necessary.
  10. M4, M5 operation check
    • Control signal: BASEB CN13E-1 to 4 (M4), BASEB CN13E-5 to 8 (M5)
    • Location of electrical component: 4-C
  11. Replace the corresponding imaging unit.
  12. Replace CPUB.
  13. Replace BASEB.

(Link to the Field Service Manual)