All Black - Ricoh B174 Service Documentation

TROUBLESHOOTING

All Black

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
B174T924.WMF
All black in
printing area?
Yes
Is charge
voltage supplied
from HVPS?
Yes
Is the Hsync/
signal received in
LSU?
Yes
The charge terminal
contact is bad
→ Replace the drum
cartridge
B174
Does the
No
video data line to LSU
change High/Low when
printing?
Replace the LSU
No
Replace the HVPS
No
Replace the LSU
4-12
Check the path between
video controller, engine
No
board, HVPS, LSU for a
short or open circuit
→ Replace the defective
board or wiring
Yes
B174T903.WMF
SM