Error Code: C-4721 Follow

Code

C-4721

Classification

Main body: APC abnormality (K)

Cause

APC abnormality.

The laser does not become active because 12 VDC power source for driving laser is not fed, MPC is wrong, or the laser is defective.

Measures to take when an alert occurs

The main body stops immediately to turn OFF the power relay (RL1).

Estimated abnormal parts

• Image processing board (IPB)
• Writing unit/K

Correction

Note

• The message "Please turn on power again" is displayed on the touch panel.

Solution

1. Perform the IO Check (99-70) and check if there is a problem with the writing unit (only LDB1 to LDB4) or IPB.
   • When the results are abnormal for LDB1 to LDB4, perform solution 2 and solution 3.
   • When the results are abnormal for IPB, perform solution 2 and solution 4.
   • When all of the results are normal, perform solution 2 and solution 3.
2. Check the connector connection between IPB and the writing unit, and the wiring. Then repair it when there is any abnormality.
3. Replace the writing unit.
4. Replace IPB.

Faulty part isolation DIPSW

Control during the detachment