50.X Service Error

HP LaserJet Models 8100 8150

Control Panel Message	50.X FUSER ERROR
Description	A fuser error has occurred.
Fuser Error Code	50.1: Low fuser temperature 50.2: Fuser warm-up service 50.3: High fuser temperature 50.4: Faulty fuser 50.5: Inconsistent fuser (verify voltage model)

Service Manual Recommended Action

Turn the printer off for at least 20 minutes, and then turn the printer on. If the error continues: 1. Make sure that the Fusing Assembly is installed correctly and is fully seated into its connectors (no bent pins or pins outside their receptacles). 2. Reseat or replace the fuser cable assembly. 3. Replace the DC Controller.

Additional Comments & Diagnosis

50.1 indicates low fuser temperature (heating lamp will not turn on). Power supply is the most common cause. (RG5-4357) Pull the fuser out and check the thermal fuse on top of the fuser and the lamps inside the unit for continuity to verify the problem isn’t in the fuser. If the printer fails to initialize when turned and displays "warming up" or if it just jumps to 50.1 error, those are indications that you have a power supply problem. After verifying the problem is related to the AC power supply, check the fuser for common wear and tear in case the fuser also needs to be replaced. When checking the fuser: Check the middle of the hot roller for toner build up that could cause ghosting or poor print quality. Check the pressure roller and gears for signs of wear. Check the bushing by rotating the gears on the side of the unit. The gears should rotate smoothly. If the bushings are worn you will typically notice: (1) Metal shavings that fall out as you're checking the unit, and (2) a jerky feeling as you rotate the gears. If you experience any of the above issues with the fuser replacement it (RG5-6532)along with the power supply.

Power Supply Removal in the HP 8100 and 8150

AC Access Cover
1. Remove the Formatter PCA
2. Remove 3 screws

Back Cover
Note: Remove the metal back cover and the plastic panel at the right side rear cover as a single unit. The square opening at the upper rear corner on the right side plastic panel is the engine test access.

1. Remove 5 screws

2. Open the top cover door, and remove 2 screw

3. Open the 2000-sheet input tray transfer door (if installed), tray 1, and the right lower door assembly
4. Remove the 2 screws from the plastic panel to the left of the metal back cover

5. Carefully release the cover around the AC input connector at the lower right of the back cover and slide the right side of the cover slightly forward
6. Carefully release the retaining tabs on the plastic panel to the left of the metal back cover by gently pulling the cover to the left while moving both pieces away from the printer chassis

Fan 3, Formatter Fan
Fan Housing
Remove 2 screws and remove housing.

Low Voltage Power Supply
1. Unplug 3 LVPS connectors
2. Unplug the LVPS fan (FM1) cable from the DC Controller
3. Remove 7 screws

Note: Make sure you remove the LVPS fan from the unit and put it on the new one before installing back in your machine.

Maintenance Kit should installed every 350,000 pages (C3914-69001)
Installation instructions