[Error Code] konica 7728

[mmbitar]

error code 50-1 at start up
i am in need for servicemanual for konica 7729 or konica 9028
thanks

[DCPS]

"DESCRIPTION: F50-01 at power up. SOLUTION ID: 8778
SOLUTION: PROBABLE CAUSES:
1. Loss of 24V DC from the DCPS. Check the continuity of all 24V DC loads to ground for possible
cause of the voltage loss. Replace the DCPS (p/n 504084510) after replacing or repairing the
shorted load.
7728
2. ICP1 on control board 3 (CB3) is open resulting in loss of 5V DC (LED3 on CB3 will be OFF).
Check for a short to ground in the paper feed unit wiring harness at CN31-9; CN33-A1, B1, and A8;
and CN40-5. Make the necessary repairs and replace CB3 (p/n 5042-9020)"