Description: There is a problem with the Fuser Assy. 1. Fuser Assy temperature is does not reach the temperature even after 110 seconds passed. 2. Fuser Assy temperature gets lower than [SetTemp. 125 C], in printing. 3. Fuser Assy temperature gets higher than [SetTemp. 220 C]. 4. The thermistor disconnection is detected. 5. The heat lamp continuously turns on for 10 seconds during the Standby Mode.
Remedy: 1 INITIAL ANALYSIS Inspect the following components. • Fuser Assy • Harness Assy Fuser-M (J271, J11, J27, J262) • PWBA HKB26 MCU • PWBA HKB PS • Switch Assy I/L Front • Switch Assy I/L Rear • Sensor Photo Exit in the Fuser Assy Are they compatible with your printer version, correctly installed, not damaged, deformed, or contaminated? Go to step 2. Replace the problem components. 2 SWITCH ASSY I/L FRONT ANALYSIS Check the Switch Assy I/L Front function using SENSOR/ SWITCH CHECH. Does the Switch Assy I/L Front function correctly and increment the Sensor Check number each time you actuate it? Go to step 3. Replace the Switch Assy I/ L Front 3 SWITCH ASSY I/L REAR ANALYSIS Check the Switch Assy I/L Rear function using SENSOR/ SWITCH CHECH. Does the Switch Assy I/L Rear function correctly and increment the Sensor Check number each time you actuate it? Go to step 4. Replace the Switch Assy I/ L Rear . 4 HARNESS ASSY FUSER-M (J271, J11, J27, J262) ANALYSIS Is there continuity between J271 and J11? Go to step 5. Replace the Harness Assy Fuser-M (J271, J11, J27, J262) . 5 HEATER ASSY ANALYSIS Does U4 appear after POWER–ON? (Answer YES if there is a momentary Fuser Assy Warm-Up Sequence) Go to 6.5 Temperature Sensor Failure. Go to step 6. 6 HEAT ROD ANALYSIS Let the Heat Rod cool down. Does the Heat Rod glow when power is switched ON? Go to step 6. Go to 6.4 Heat Rod Failure. 7 Does the Heat Rod switch ON and OFF after Power–On Sequence? Go to step 8. Go to step 9. 8 HEAT ROD ANALYSIS Is there proper VAC between P/J11-1 and P/J11-2? Go to 6.5 Temperature Sensor Failure. Replace the PWBA HKB PS . 9 PWBA HKB PS ANALYSIS Perform this check within 65 seconds after switching power ON. After specified seconds, PWBA HKB PS shuts down due to a no–load condition. Is there +3.3VDC between P/J281-10 and P/J28-8 on the PWBA HKB PS? Go to step 10. Go to 6.1 LVPS Failure (+3.3VDC). 10 HEAT ROD ACTUATOR SIGNAL ANALYSIS Disconnect P/J28 on the PWBA HKB26 MCU . Is there 0VDC between P/J 28-12 and P/J 28-8 on the PWBA HKB26 MCU during Power–ON sequence, and does the voltage rise to +3.3VDC when the sequence finishes? Go to 6.1 PWBA HKB PS Failure (+3.3 VDC). Replace the PWBA HKB26 MCU .
Code: U5
Display: U5:Fan AssyFAIL
Description: There is a problem with the Fan Assy. 1. The Fan Motor stops rotating after the printerpower is turned on.
Remedy: 1 INITIAL ANALYSIS Inspect the following components. • Fan Assy • PWBA HKB26 MCU • PWB ESS Are they compatible with your printer version, correctly installed, not damaged, deformed, or contaminated? Go to step 2. Replace the problem components. 2 FAN ASSY ANALYSIS Can you hear or see the Fan Assy spinning when you power-on the printer? Go to step 3. Go to 6.16 Fan Assy Failure. 3 FAN ASSY SIGNAL ANALYSIS Check the voltage between P/J28-13 and P/J28-8 on the PWBA HKB26 MCU while the U5 code is displayed. Is there +3.3VDC between P/J28-13 and P/J28-8? Replace the Fan Assy . Replace the PWBA HKB26 MCU .
Code: U6
Display: U6:NVM FAIL
Description: There is a problem with NVRAM. 1. An NVRAM read error occurred immediately when you switched ON main power. 2. A write error occurred when you tried to write toNVRAM. 3. The overflow of the Task Table.
Remedy: 1 INITIAL ANALYSIS Inspect the following component. • PWBA HKB26 MCU Is it compatible with your printer version, correctly installed, not damaged, deformed, or contaminated? Go to step 2. Replace the problem component. 2 Does U6 appear after you switch ON Main Power? Go to step 5. Problem corrected. 3 Switch Main Power OFF and ON several times. Does U6 still appear when you switch ON Main Power again? Go to step 4. Problem solved. 4 PWBA HKB26 MCU ANALYSIS Enter DIAGNOSTIC MODE MENU. Can you enter DIAGNOSTIC MODE MENU? Go to step 5. Replace the PWBA HKB26 MCU . (If U6 continues, go to 6.20 Electrical Noise). 5 NVRAM ANALYSIS Enter ADJUSTMENT MODE MENU and check the parameters for each value of NVRAM Code. Are all parameters set correctly? Replace the PWBA HKB26 MCU . Go to step 6. 6 PWBA HKB26 MCU ANALYSIS 1. Enter correct parameters. 2. Switch OFF Main Power. 3. Switch ON Main Power. Does U6 still appear? Replace the PWBA HKB26 MCU . Problem solved. Return to Service Flowchart.