SC400 (Engine: Imaging 3: Around the Drum)

SC490-00

D

Toner Density Sensor Error

The sensor output value is 930 or more continuously for 5 seconds.

• Toner density sensor defective
• Toner motor defective
• Connect-Left PCB (PCB20) defective
• IOB (PCB17) defective

• Toner density sensor defective
  
  1. Reconnect the following connectors.
     
     • Toner Density Sensor – Drum PCB (PCB10) connector
     • 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. Check that the gears and rollers of the development unit are not damaged and rotate smoothly.
  4. Replace the development unit.

• Toner motor defective
  
  1. Check the drive gears can rotate or they are not unusually loaded. If necessary, replace the drive gear.
  2. Reconnect the following connectors.
     
     • Toner Density Sensor – Drum PCB (PCB10) connector
     • Drum PCB (PCB10) – Drum Connection PCB (PCB11) connector
     • Drum Connection PCB (PCB11) – Connect-Left PCB (PCB20) connector
     • Connect-Left PCB (PCB20) – IOB (PCB17) connector
  3. If the connector is broken, shorted, or grounded, replace the connector.
  4. Replace the drum unit.

• Connect-Left PCB (PCB20) defective
  Replace the Connect-Left PCB (PCB20).
• IOB (PCB17) defective
  
  1. Update the engine software to the latest version.
  2. Replace the IOB (PCB17).

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).

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.

• Connect-Left PCB (PCB20) defective
  Replace the Connect-Left PCB (PCB20).
• IOB (PCB17) defective
  
  1. Update the engine software to the latest version.
  2. Replace the IOB (PCB17).