• Code: F6
• Description: Service Call LV Power Supply Unit Data communication error between LVPS and the engine controller board.
• Remedy: 1 Check cable for continuity between engine controller board connector LVCN and LVPS ACN4 connector. Also check for shorted pins. Is cable okay? Go to step 2. Replace cable. 2 Replace LVPS. See “Low voltage power supply (LVPS) with cage removal”. Does problem persist? Go to step 3. Problem solved. 3 Replace engine controller board. See “Engine controller board removal”. Does problem persist? Contact higher level support. Problem solved.

• Code: H0
• Description: Service Call Fuser Unit Temperature signal from thermistor is not detected.
• Remedy: 1 Remove and reinstall fuser assembly. See “Fuser assembly removal”. Does error clear? Problem solved. Go to step 2. 2 Check fuser connector for damage. Replace if necessary. Does error clear? Problem solved. Go to step 3. 3 Turn printer off, and check cable that connects engine controller board connector FUCN to fuser for proper connection, continuity, and pin shorts. Is cable okay? Go to step 4. Properly connect cable or replace if damaged. If error clears, problem solved, otherwise go to step 4. 4 Replace fuser assembly. See “Fuser assembly removal”. Does error clear? Note: Fuser is a customer order supply. Problem solved. Replace engine controller board. See “Engine controller board removal”.

• Code: H1
• Description: Service Call Fuser Unit Circuitry that controls the fuser temperature has failed.
• Remedy: 1 Check for proper input line voltage. Is line voltage correct? Go to step 2. Provide proper line voltage. 2 Remove and reinstall fuser assembly. See “Fuser assembly removal”. Does error clear? Problem solved. Go to step 3. 3 Check fuser connector for damage. Replace if necessary. Does error clear? Problem solved. Go to step 4. 4 Turn printer off, and check cable that connects engine controller board connector FUCN to fuser for proper connection, continuity, and pin shorts. Is cable okay? Go to step 5. Properly connect cable or replace if damaged. If error clears, problem solved, otherwise go to step 5. 5 Replace fuser assembly. See “Fuser assembly removal”. Does error clear? Note: Fuser is a customer-ordered supply. Problem solved. Replace LVPS. See “Low voltage power supply (LVPS) with cage removal”. If error does not clear, replace engine controller board. See “Engine controller board removal”.

• Code: H2
• Description: Service Call Fuser Unit Fusing temperature is not reached within the warming-up time period.
• Remedy: 1 Check for proper input line voltage. Is line voltage correct? Go to step 2. Provide proper line voltage. 2 Remove and reinstall fuser assembly. See “Fuser assembly removal”. Does error clear? Problem solved. Go to step 3. 3 Check fuser connector for damage. Replace if necessary. Does error clear? Problem solved. Go to step 4. 4 Turn printer off, and check cable that connects engine controller board connector FUCN to fuser for proper connection, continuity, and pin shorts. Is cable okay? Go to step 5. Properly connect cable or replace if damaged. If error clears, problem solved, otherwise go to step 5. 5 Replace fuser assembly. See “Fuser assembly removal”. Does error clear? Note: Fuser is a customer-ordered supply. Problem solved. Replace LVPS. See “Low voltage power supply (LVPS) with cage removal”. If error does not clear, replace engine controller board. See “Engine controller board removal”.

• Code: H3
• Description: Service Call Fuser Unit Fusing temperature drops below fusing threshold during the printing process and does not reach fusing temperature again within alloted time.
• Remedy: 1 Check for proper input line voltage. Is line voltage correct? Go to step 2. Provide proper line voltage. 2 Remove and reinstall fuser assembly. See “Fuser assembly removal”. Does error clear? Problem solved. Go to step 3. 3 Check fuser connector for damage. Replace if necessary. Does error clear? Problem solved. Go to step 4. 4 Turn printer off, and check cable that connects engine controller board connector FUCN to fuser for proper connection, continuity, and pin shorts. Is cable okay? Go to step 5. Properly connect cable or replace if damaged. If error clears, problem solved, otherwise go to step 5. 5 Replace fuser assembly. See “Fuser assembly removal”. Does error clear? Note: Fuser is a customer-ordered supply. Problem solved. Replace LVPS. See “Low voltage power supply (LVPS) with cage removal”. If error does not clear, replace engine controller board. See “Engine controller board removal”.

• Code: H4
• Description: Service Call Fuser Unit Fusing temperature rises above limit during printing process and does not return within the alloted time period.
• Remedy: 1 Check for proper input line voltage. Is line voltage correct? Go to step 2. Provide proper line voltage. 2 Remove and reinstall fuser assembly. See “Fuser assembly removal”. Does error clear? Problem solved. Go to step 3. 3 Check fuser connector for damage. Replace if necessary. Does error clear? Problem solved. Go to step 4. 4 Turn printer off, and check cable that connects engine controller board connector FUCN to fuser for proper connection, continuity, and pin shorts. Is cable okay? Go to step 5. Properly connect cable or replace if damaged. If error clears, problem solved, otherwise go to step 5. 5 Replace fuser assembly. See “Fuser assembly removal”. Does error clear? Note: Fuser is a customer-ordered supply. Problem solved. Replace LVPS. See “Low voltage power supply (LVPS) with cage removal”. If error does not clear, replace engine controller board. See “Engine controller board removal”.

• Code: HA
• Description: Service Call Fuser Unit AC relay turned off due to an abnormal temperature.
• Remedy: 1 Check for proper input line voltage. Is line voltage correct? Go to step 2. Provide proper line voltage. 2 Remove and reinstall fuser assembly. See “Fuser assembly removal”. Does error clear? Problem solved. Go to step 3. 3 Check fuser connector for damage. Replace if necessary. Does error clear? Problem solved. Go to step 4. 4 Turn printer off, and check cable that connects engine controller board connector FUCN to fuser for proper connection, continuity, and pin shorts. Is cable okay? Go to step 5. Properly connect cable or replace if damaged. If error clears, problem solved, otherwise go to step 5. 5 Replace fuser assembly. See “Fuser assembly removal”. Does error clear? Note: Fuser is a customer-ordered supply. Problem solved. Replace LVPS. See “Low voltage power supply (LVPS) with cage removal”. If error does not clear, replace engine controller board. See “Engine controller board removal”.

• Code: L1
• Description: Service Call Laser Unit Assembly Laser scanning beam is not detected by beam sensor.
• Remedy: 1 Check LCN connection on laser assembly LDU board. Is connector properly connected? Go to step 2. Properly connect LCN cable. If error clears, problem solved, otherwise go to step 2. 2 Check LCN connection on engine controller board. Is cable properly connected? Go to step 3. Properly connect LCN cable. If error clears, problem solved, otherwise go to step 3. 3 Check cable that connects engine controller board LCN and LDU LCN connectors for continuity and shorted pins. Is cable okay? Replace laser unit assembly. “Upper right rear cover removal”. Go to step 4. Replace cable. Go to step 4. 4 Does error clear? Problem solved. Replace engine controller board. See “Engine controller board removal”.