C3C4 Connection error

Error code
  • 032521 C3C4 Connection error
Occurrence condition
  • C3C4 Additional Main Board failure
  • Connection harness (1) (C3C4 Drawer Connector) failure
  • Connection harness (2) (C2 Drawer Connector) failure
  • C2 Additional Main Board failure
  • Connection harness (3) (C1 Drawer Connector) failure
  • Connection harness (4) (Main Unit Drawer Connector) failure
  • MCU board failure
  • Failure of the Main board
Assumed cause
  • C3C4 Additional Main Board
  • Connection harness (1) (C3C4 Drawer Connector)
  • Connection harness (2) (C2 Drawer Connector)
  • C2 Additional Main Board
  • Connection harness (3) (C1 Drawer Connector)
  • Connection harness (4) (Main Unit Drawer Connector)
  • MCU Board
  • Main Board
Troubleshooting
Step Confirmation and action YES NO
1

Replace the C3C4 Additional Main Board

  • Replace the C3C4 Additional Main Board and check if the error occurs.
 Go to step 2

End
2

Replace the C2 Additional Main Board

  • Replace the C2 Additional Main Board and check if the error occurs.

 Go to step 3

End
3

Replace the connection harness (1)

  • Replace the connection harness (1) (C3C4 Drawer Connector).
  • Does the error still occur after the harness is replaced?
 Go to step 4

End
4

Replace the connection harness (2)

  • Connection harness (2) (C2 Drawer Connector)
  • Does the error still occur after the harness is replaced?
 Go to step 5

End
5

Replace the connection harness (3)

  • Replace the connection harness (3) (C1 Drawer Connector).
  • Does the error still occur after the harness is replaced?
 Go to step 6

End
6

Replace the connection harness (4)

  • Replace the connection harness (4) (Main Unit Drawer Connector).
  • Does the error still occur after the harness is replaced?
 Go to step 7

End
7

Replace the MCU board

  • Does the error still occur after replacing the MCU Board?
 Go to step 8

End
8

Replacement of Main Board

  • Does the error still occur after replacing the Main Board?
 Contact EPSON Local Service Representatives End