miricardasked Sep 24, 2015 at 6:56am
I have a Hp LaserJet 4Si printer with an "error 50" problem.
The Laserjet IIISi&4Si service Tool reports this error : "Fixing unit malfunction : Heater open"
I have tried to clear error 50 and failed.
I have checked J1 and J11. These are Ok.
I did not find J3.
I have checked CB101 ( circuit breaker 101 ). It appears with no resistance. I am not sure it is normal for the red pin cannot be plugged in.
The fusing assemble keeps despairingly cold.
Does anyone have an idea to fix this problem ?
Most likely the quartz lamp in the fuser assy. burned out. you can remove it and check the resistance on the 2 large pins in the connector. Should be several ohms.
Thank you for your quick answer.
I have removed the fuser assembly and checked the resistance. It's about 6 ohms.
I have made other tests with a brand new fuser assembly before posting. Nothing has changed.
The next thing to try would be the AC power supply. That's what powers the fuser assy. Haven't worked on one of those old beasts in over 5 years.RG5-0166-060CN