• Code: 50.3
• Display: 50.X FUSER ERROR
• Description: A fuser error has occurred.
  high fuser temperature
• Remedy: Fuser Failure (Abnormally High Temperature Main Thermistor) 1. The connector between the fuser and the printer is not connected properly. Reseat the fuser. Check the connector J5013 between the fuser and the printer. Replace it if damaged. 2. Short in the main thermistor. Turn the printer off and remove the fuser. Measure the resistance between the fuser connectors J5013LA-2 (MAINTH) and J5013LA-1 (GND). If it is in the rage of 330k ohms to 50k ohms (at ambient temperature), replace the fuser. 3. Faulty DC controller PCB. Replace the DC controller PCB.

• Code: 50.4
• Display: 50.X FUSER ERROR
• Description: A fuser error has occurred.
  faulty fuser
• Remedy: 1. Faulty fuser power supply PCB, replace the low-voltage power supply PCB. 2. Faulty DC controller PCB, replace the DC controller PCB. 3. For the following errors, perform the indicated action.

• Code: 50.8
• Display: 50.X FUSER ERROR
• Description: A fuser error has occurred.
  low fuser temperature (subthermistor)
• Remedy: Fuser Failure (Abnormally Low Temperature Sub Thermistor) 1. The connector between the fuser and the printer is not connected properly. Reseat the fuser. Check the connector J5013 between the fuser and the printer. Replace it if damaged. 2. Break in the sub thermistor. Turn the printer off and remove the fuser. Measure the resistance between the fuser connectors J5013LA-4 (SUBTH) and J5013LA-3 (+3.3V). If it reads 600 ohms or below (at ambient temperature), replace the fuser. 3. Faulty DC controller PCB, replace the DC controller PCB.

• Code: 50.9
• Display: 50.X FUSER ERROR
• Description: A fuser error has occurred.
  high fuser temperature (subthermistor)
• Remedy: Fuser Failure (Abnormally High Temperature Sub Thermistor) 1. The connector between the fuser and the printer is not connected properly. Reseat the fuser. Check the connector J5013 between the fuser and the printer. Replace it if damaged. 2. Short in the sub thermistor. Turn the printer off and remove the fuser. Measure the resistance between the fuser connectors J5013LA-4 (SUBTH) and J5013LA-3 (+3.3V). If it reads 600 ohms or below (at ambient temperature), replace the fuser. 3. Faulty DC controller PCB, replace the DC controller PCB.

• Code: 51.XY
• Display: 51.XY. PRINTER ERROR
• Description: A laser/scanner error has occurred
  X Description: 1 - beam detect error 2 - laser error Y Description: 0 - no color K - black C - cyan M - magenta Y - yellow
• Remedy: 1. Press OK to continue. 2. If the message persists, turn the printer off and then back on. 3. The connectors in the laser/scanner control line are not connected properly. Reseat the DC controller PCB connectors (J1022, J1026, J1027) and the laser/scanner unit connectors (J101A, J101B, J5001A, J5001B, J5020). 4. Faulty laser/scanner unit, replace the laser/scanner unit. 5. Faulty DC controller PCB, replace the DC controller PCB.

• Code: 52.XY
• Display: 52.XY PRINTER ERROR
• Description: A laser/scanner motor failure has occurred
  X Description: 1 - scanner error 2 - scanner startup error 3 - scanner rotation error
  Y Description: 0 - no color K - black C - cyan M - magenta Y - yellow
• Remedy: 1. Press OK to continue. 2. If the message persists, turn the printer off and then back on. 3. The connectors in the laser/scanner control line are not connected properly. Reseat the DC controller PCB connectors (J1022, J1026, J1027) and the laser/scanner connectors (J101A, J101B, J5001A, J5001B, J5020). 4. Faulty laser/scanner, replace the laser/ scanner. 5. Faulty DC controller PCB, replace the DC controller PCB.

• Code: 53.XY.ZZ
• Display: 53.XY.ZZ CHECK DIMM A Bank B
• Description: HP 3700 only An error occurred in printer memory. Values of A, and ZZ are:
  A Device Location: 1 - DIMM Slot 1 (bottom slot) 2 - DIMM Slot 2 3 - DIMM Slot 3 4 - DIMM Slot 4
  ZZ Error Number: 00 - DIMM unsupported 01 - DIMM SPD failure (unrecognized memory) 03 - DIMM error
  HP 3500 & HP 3700 53.10.03 Memory error
• Remedy: 1. Press Stop. See Installing memory and font DIMMs in chapter 3 for DIMM installation information. 2. Check the ZZ error number for the specific DIMM, then: - Reseat the DIMM. - Try the DIMM in another slot (except for the firmware DIMM in slot 1). - Make sure there are DIMMS installed. - Make sure the DIMMs are supported. - Try the DIMM in another printer. 53.10.03 HP 3500 - Replace the formatter. HP 3700 - Perform the following steps: 1. Try the firmware DIMM in slot 1 in another printer. 2. Replace the formatter PCB.

• Code: 54.XX
• Display: 54.XX PRINTER ERROR
• Description: A printer command error has occurred. Note: Some messages are displayed in the event log and some are displayed on both the control panel and in the event log, as identified below. XX Description: (Event log only messages) 01 - humidity environmental sensor error 05 - media sensor error 06 - Dmax density sensor out of range 11 - yellow density sensor error 12 - magenta density sensor error 13 - cyan density sensor error 14 - black density sensor error 15 - yellow CPR sensor error 16 - magenta CPR sensor error 17 - cyan CPR sensor error 18 - black CPR sensor error 20 - CPR sensor error (Control panel and event log message) 21 - yellow toner remaining sensor error 22 - magenta toner remaining sensor error 23 - cyan toner remaining sensor error 24 - black toner remaining sensor error 31 - Media sensor calibration failure (Event log only message) 32 - Media sensor is not calibrated (event log only) 54.30.XX (event log only) HP3700 only Halftone calibration error. XX Description: 06 - magenta data out of range. 07 - yellow data out of range. 08 - black data out of range. 09 - cyan data out of range. for 54.32 error: The image density adjustment value, color misregistration adjustment value, and PWM adjustment value (see note below) are stored in the EEPROM (NVRAM) of the formatter. Whenever a formatter or laser/scanner unit is replaced, you must calibrate the printer to update the values. a. Image density adjustment (on formatter replacement) b. Color misregistration adjustment (on formatter replacement) c. PWM adjustment (on both formatter and laser/scanner unit replacement) Note: The PWM adjustment value enables reproduction of an image in the best tone. The formatter determines the value based on the amount of laser light received from the printer engine.
• Remedy: 1. Turn the printer off and then back on. 2. For the specific error messages, perform the indicated action: 54.01 - Environment Sensor Abnormality 1. The connector in the environment detection signal line is not properly connected. Reseat the DC controller PCB connector J1015. 2. Defective environment sensor, replace the environment sensor. 3. Defective DC controller PCB, replace the DC controller PCB. 54.05 - Media sensor error 1. Perform the steps for error 54.32, below. 2. Replace the media sensor. 3. Replace the DC controller. 54.06 54.11 54.12 54.13 54.14 1. Perform a Calibrate Now procedure. 2. The DC controller is defective, replace the DC controller PCB. 54.15 54.16 54.17 54.18 54.20 Color misregistration sensor abnormality 1. The connectors between the color misregistration sensor (CPR) and the DC controller PCB are not connected properly. Reseat the color misregistration sensor (CPR) connectors (J505A, J505B) and the DC controller PCB connector J1012. 2. Faulty color misregistration sensor (CPR). Replace the color misregistration sensor (CPR). 3. Faulty DC controller PCB. Replace the DC controller PCB. 54.21 - 54.22 - 54.23 - 54.24 - Toner (Y/M/C/K) level sensor abnormality 1. The connectors in the toner level sensor control line are not connected properly. Reseat the memory controller PCB connector J201 and the DC controller PCB connector J1025. 2. Faulty memory controller PCB. Replace the memory controller PCB. 3. Faulty DC controller PCB. Replace the DC controller PCB. 54.31 - Media Sensor Abnormality/ Afteradjustment Value Out of Spec 1. Try to calibrate the media sensor again. 2. Dirty media sensor. Clean the media sensor. 3. The connectors in the media detection signal line are not properly connected. Reseat the media sensor connector J601, relay connector J5026, and DC controller PCB connector J1008. 4. Defective media sensor. Replace the media sensor. 5. Defective DC controller PCB. Replace the DC controller PCB. 54.32 - Electrical Adjustment When the media sensor is replaced, the light intensity of the sensor must be adjusted. Follow the procedure below to adjust the light intensity. 1. Turn the printer OFF. 2. Open the front door. 3. While pressing down the engine test print switch, turn the printer ON. 4. Close the front door. 5. Load paper into Tray 1 (use plain white paper for test printing). 6. As the printer goes into READY period, press the engine test print switch and test print. 7. One sheet of paper will be fed into the printer from Tray 1 and will be delivered to the face-down delivery tray. 54.33 - 1. Defective laser/scanner. Replace the laser/scanner unit. 2. Defective DC controller PCB. Replace the DC controller PCB