Ricoh IM 550F

6.Troubleshooting
550
SC No.
Type
Error Name/Error Condition/Major Cause/Solution
SC491-
01
D
Drum Unit Type Mismatch Error
• Cannot communicate with the EEPROM of the drum PCB (PCB10) normally.
• An incompatible drum unit is installed.
• Connector defective or disconnected
• Drum PCB (PCB10) defective
• Connect-Left PCB (PCB20) defective
• IOB (PCB17) defective
• Connector defective or disconnected
Reconnect the following connectors. Then perform a conduction inspection. If
there is no conduction, replace the connector.
• Drum Unit – Drum Connection PCB (PCB11) connector
• Drum Connection PCB (PCB11) – Connect-Left PCB (PCB20) connector
• Connect-Left PCB (PCB20) – IOB (PCB17) connector
• Drum PCB (PCB10) defective
Replace the Drum PCB (PCB10).
• Connect-Left PCB (PCB20) defective
Replace the Connect-Left PCB (PCB20).
• IOB (PCB17) defective
Replace the IOB (PCB17).
SC No.
Type
Error Name/Error Condition/Major Cause/Solution
SC491-
02
D
Drum Unit Error
• No response from the device in reading/writing for 5 ms or more and this
problem is repeated 5 times consecutively.
• The reading data of 2 locations do not match 8 times consecutively.
• The writing data and reading date do not match 8 times consecutively.
• Drum PCB (PCB10) defective
• Connect-Left PCB (PCB20) defective
• IOB (PCB17) defective
• Drum PCB (PCB10) defective
1. Reconnect the following connectors.
• Drum PCB (PCB10) – Drum Connection PCB (PCB11) connector
• Drum Connection PCB (PCB11) – Connect-Left PCB (PCB20)
connector
• Connect-Left PCB (PCB20) – IOB (PCB17) connector
2. If the connector is broken, shorted, or grounded, replace the connector.
3. Replace the drum unit.