C8402 (C4751i)

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ByEric Ditges
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Contents

Trouble typeC8402: Multi feed detection board failure (When UK-P19 is installed)
RankC
Trouble detection conditionWhen the main power switch ON or when the original is being conveyed, the AD value there is no paper loaded state is out of the predetermined range.
Trouble isolationDF
Relevant electrical partsMulti feed detection board/TX (MFDB/TX)Multi feed detection board/RX (MFDB/RX)DF control board (DFCB)

Procedure

  1. Check the connector between MFDB/TX CN111-relay CN114-DFCB CN1 for proper connection and correct as necessary.
  2. Check the connector between MFDB/RX CN110-relay CN115-DFCB CN1 for proper connection and correct as necessary.
  3. MFDB/TX operation check
    • Control signal: DFCB CN1-6
    • Location of electrical component: 13-X
  4. MFDB/RX operation check
    • Control signal: DFCB CN1-3
    • Location of electrical component: 12-X
  5. MFDB/TX ICP1 conduction check
  6. Replace MFDB/TX.
  7. Replace MFDB/RX.
  8. Replace DFCB.

(Link to the Field Service Manual)