C8402 (bizhub 958/808)

Contents

Trouble type	C8402: Multi feed detection board failure (When UK-501 is installed)
Rank	C
Trouble detection condition	• The AD value went below the predetermined the HI side threshold for two consecutive times. • The AD value went above the predetermined the LOW side threshold for two consecutive times.
Trouble isolation	DF
Relevant electrical parts	• Multi feed detection board/1 (transmitter) (MFDB/1) • Multi feed detection board/2 (receiver) (MFDB/2) • Sensor control board (SCB) • DF control board (DFCB)

 Procedure

1. Remove the film stuck on the window of the lower guide assembly.
2. Use the adjustment sheet for double feed detection kit (UK-501), and select [ADF] -> [Multi-Feed DetectionAdj.].
3. Use the misdetected paper, and select [ADF] -> [ Multi-Feed DetectionAdj. ].
4. Check the connector between MFDB/1-relay CN114-SCB CN104 for proper connection and correct as necessary.
5. Check the connector between MFDB/2-SCB CN103 for proper connection and correct as necessary.
6. Check the connector between SCB CN101-DFCB CN8 for proper connection and correct as necessary.
7. MFDB/1 operation check
   • Control signal: SCB CN104
   • Location of electrical component: DF 11-L
8. MFDB/2 operation check
   • Control signal: SCB CN103
   • Location of electrical component: DF 10-J
9. Replace SCB. (Part# A8WCH00100)
10. DFCB ICP11 conduction check
11. Replace DFCB. (Part# A782H0010A)

NOTICE

• Link to the wiring diagram (Dual scan document feeder)

Please search Knowledge Base articles and Bulletins as they may contain relevant information and updated Part information such as Part numbers.

K.3.13.7 (Link to the Field Service Manual)