• Code: 312-04
• Description: Charge roller feed back voltage error: Ye. The feedback voltage of the charge AC for each color is 0.3V or less for consecutive 200ms after the charge AC is activated in the standard or half line speed.
• Causes: • Disconnected/incorrect harness for the power pack • Damaged/incorrect PCU • Power pack failure • Disconnected harness/connector
• Remedy: 1. Check the drum condition: Check the terminal to see if there is dust, damage, or deformation. Check the continuity as well. If not good, replace the PCDU. If the SC reoccurs, go to the next step. 2. Check all the related connectors are firmly connected: If not good, reconnect the connector. Check if the SC reoccurs by cycling the power off/on. If the SC reoccurs, go to the next step. 3. Check the mainframe condition: Check if there is dust on the terminal for charging, or any damage/ deformation. Check the continuity between the power packs and charging terminal. If the SC reoccurs, go to the next step. 4. Check the Power pack: Try installing a new power pack to determine whether the power pack is the cause. If the SC does not occur with the new one, the old power pack was defective. 5. Replace the BiCU. SC Tables 467

• Code: 325-00
• Description: Color development motor error The motor LOCK signal is not detected for more than 2 seconds while the motor START signal is on.
• Causes: • PCDU overload • Defective development motor
• Remedy: • Replace the PCDU • Replace the development motor.

• Code: 360-01
• Description: TD sensor (Vt high) error 1: Bk • count is higher than the threshold which detects no developer • count is lower than the upper/lower target thresholds three consecutive times.
• Causes: • TD sensor (mu sensor, sensor) failure • Harness loose or disconnected • An old PCDU may be installed
• Remedy: 1. Check all the related connecters are connected. If not good, reconnect the connectors. Check if the SC reoccurs by cycling the power off/on. If the SC reoccurs, go to next step. 2. Check the development unit (e.g. Gear/harness disconnected? Heat protection seal removed? Using an old PCDU?). If not good, replace the development unit. If the SC reoccurs, go to the next step. 3. Check whether the TD sensor is deformed, scratched, damaged or has dust sticking to it. If not good, replace the PCDU. If the SC reoccurs, go to the next step. 4. Check the TD sensor harnesses, and the harness between the mainframe and PCDU. If not good, replace the harness. If the SC reoccurs, go to the next step. 5. Replace the BiCU.

• Code: 360-02
• Description: TD sensor (Vt high) error 1: Cy • count is higher than the threshold which detects no developer • count is lower than the upper/lower target thresholds three consecutive times.
• Causes: • TD sensor (mu sensor, sensor) failure • Harness loose or disconnected • An old PCDU may be installed
• Remedy: 1. Check all the related connecters are connected. If not good, reconnect the connectors. Check if the SC reoccurs by cycling the power off/on. If the SC reoccurs, go to next step. 2. Check the development unit (e.g. Gear/harness disconnected? Heat protection seal removed? Using an old PCDU?). If not good, replace the development unit. If the SC reoccurs, go to the next step. 3. Check whether the TD sensor is deformed, scratched, damaged or has dust sticking to it. If not good, replace the PCDU. If the SC reoccurs, go to the next step. 4. Check the TD sensor harnesses, and the harness between the mainframe and PCDU. If not good, replace the harness. If the SC reoccurs, go to the next step. 5. Replace the BiCU.

• Code: 360-03
• Description: • count is higher than the threshold which detects no developer • count is lower than the upper/lower target thresholds three consecutive times.
• Causes: • TD sensor (mu sensor, sensor) failure • Harness loose or disconnected • An old PCDU may be installed
• Remedy: 1. Check all the related connecters are connected. If not good, reconnect the connectors. Check if the SC reoccurs by cycling the power off/on. If the SC reoccurs, go to next step. 2. Check the development unit (e.g. Gear/harness disconnected? Heat protection seal removed? Using an old PCDU?). If not good, replace the development unit. If the SC reoccurs, go to the next step. 3. Check whether the TD sensor is deformed, scratched, damaged or has dust sticking to it. If not good, replace the PCDU. If the SC reoccurs, go to the next step. 4. Check the TD sensor harnesses, and the harness between the mainframe and PCDU. If not good, replace the harness. If the SC reoccurs, go to the next step. 5. Replace the BiCU.

• Code: 360-04
• Description: TD sensor (Vt high) error 1: Ma • count is higher than the threshold which detects no developer • count is lower than the upper/lower target thresholds three consecutive times.
• Causes: • TD sensor (mu sensor, sensor) failure • Harness loose or disconnected • An old PCDU may be installed
• Remedy: 1. Check all the related connecters are connected. If not good, reconnect the connectors. Check if the SC reoccurs by cycling the power off/on. If the SC reoccurs, go to next step. 2. Check the development unit (e.g. Gear/harness disconnected? Heat protection seal removed? Using an old PCDU?). If not good, replace the development unit. If the SC reoccurs, go to the next step. 3. Check whether the TD sensor is deformed, scratched, damaged or has dust sticking to it. If not good, replace the PCDU. If the SC reoccurs, go to the next step. 4. Check the TD sensor harnesses, and the harness between the mainframe and PCDU. If not good, replace the harness. If the SC reoccurs, go to the next step. 5. Replace the BiCU.

• Code: 361-01
• Description: TD sensor (Vt) upper limit error: Bk. The machine detects that Vt (TD sensor output, SP3-210-001) is higher than the upper limit threshold (specified in SP3-211-002) for the specified consecutive times in SP3-211-003.
• Causes: • TD sensor connector is disconnected
• Remedy: To check if the issue is resolved: 1. Cycle the power off/on. 2. Feed one sheet of paper. 3. Check Vt with SP3-210-001 through -004. 4. Check if Vt is higher than the upper threshold (specified in SP3-211-002). Incorrect: Vt is higher than the upper threshold Correct: Vt is equal to or lower than the upper threshold Troubleshooting procedure: 1. Check all the connectors are firmly connected. If not, reconnect the connectors. Check if the SC reoccurs by cycling the power off/on. If the SC reoccurs, go to the next step. 2. Check the development unit (e.g. Gear/harness disconnected? Heat protection seal removed? Using an old PCDU?). If not good, replace the PCDU. If the SC reoccurs, go to the next step. 3. Check the TD sensor. If not good, replace the TD sensor. If the SC reoccurs, go to the next step. 4. Check the parameters (e.g. SP3-030-061 through -064 should be changed from its initial value, but could be not changed due to possible NVRAM clearing). If not good, replace the PCDU and initialize the developer. This corrects the TD sensor settings. 5. Check the toner supply unit, especially if the image density is too low. If the toner bottle is empty, the toner supply route is clogged, and/or the toner supply motor operates incorrectly, then correct the problem. If the SC reoccurs, go to the next step. 6. Check the harness connection. If not good, replace the harness between BiCU and PCDU. 7. Replace the BiCU.

• Code: 361-02
• Description: TD sensor (Vt) upper limit error 1: Cy. The machine detects that Vt (TD sensor output, SP3-210-001) is higher than the upper limit threshold (specified in SP3-211-002) for the specified consecutive times in SP3-211-003.
• Causes: • TD sensor connector is disconnected
• Remedy: To check if the issue is resolved: 1. Cycle the power off/on. 2. Feed one sheet of paper. 3. Check Vt with SP3-210-001 through -004. 4. Check if Vt is higher than the upper threshold (specified in SP3-211-002). Incorrect: Vt is higher than the upper threshold Correct: Vt is equal to or lower than the upper threshold Troubleshooting procedure: 1. Check all the connectors are firmly connected. If not, reconnect the connectors. Check if the SC reoccurs by cycling the power off/on. If the SC reoccurs, go to the next step. 2. Check the development unit (e.g. Gear/harness disconnected? Heat protection seal removed? Using an old PCDU?). If not good, replace the PCDU. If the SC reoccurs, go to the next step. 3. Check the TD sensor. If not good, replace the TD sensor. If the SC reoccurs, go to the next step. 4. Check the parameters (e.g. SP3-030-061 through -064 should be changed from its initial value, but could be not changed due to possible NVRAM clearing). If not good, replace the PCDU and initialize the developer. This corrects the TD sensor settings. 5. Check the toner supply unit, especially if the image density is too low. If the toner bottle is empty, the toner supply route is clogged, and/or the toner supply motor operates incorrectly, then correct the problem. If the SC reoccurs, go to the next step. 6. Check the harness connection. If not good, replace the harness between BiCU and PCDU. 7. Replace the BiCU.