Ricoh A229 Service Manual page 443

SERVICE CALL CONDITIONS
SC547: Zero cross signal malfunction
-Definition- [A]
Zero cross signals are not detected within a certain period after the main power
switch has been turned on.
- Possible causes -
• Power supply board defective
• Noise on the ac power line
SC590: Toner collection motor error
-Definition- [B]
The toner collection motor sensor output does not change for 3 seconds while
the toner collection motor is on.
- Possible causes -
• Toner collection motor defective
• Too much load on the drive mechanism
• Poor toner collection motor connector connection
• IOB defective
• Toner collection motor sensor defective
SC601: Communication error between SBICU and SBU
-Definition- [B']
The SBICU cannot communicate with the SBU board properly.
- Possible causes -
• Poor connection between the SBICU and SBU
• SBU defective
• SBICU defective
SC602: Communication error between SBICU and HDD controller
-Definition- [B]
The SBICU cannot communicate with the HDD controller properly.
- Possible causes -
• Poor connection between the SBICU board and HDD control board
• SBICU board defective
A229 6-20 SM