Processor i/o pcb F15 fuse keeps disconnecting

[korea lp7500]

 

If the F15 fuse breaks 
5508
5532
5533 
Error Occurred

If you install a new fuse
Multiple errors appear together.

Edited December 24, 2025 by korea lp7500

[kodak_service]

Check the 24V voltage on test point TP4.

[OneHourLater]

All of the errors I can see involve the safety system. Check the Processor Relay PCB for any signs of damage. Make sure the back side of the board was not exposed to any processing solutions of chemicals. Check for any pinched wires going to any of the floats, or dryer. 

[Minilab service]

Errors have because missing 24V3. If F15 blows and F14 not then 24V-3 has short circuit. Need to find wthich pcb causes it ( I/O PCB1 , or relay pcb ) .

Disconnect J/P674 , change F15 and power on printer. Look new fuse burns, or not.