| Author |
Message |
Tom
| | Posted on Sunday, May 12, 2002 - 2:15 pm: | |
The HP LaserJet II/IID/III/IIID, Apple LaserWriter II and many other Canon SX engine based printers have two common causes of the Service Error 50, a failure of the Triac in the AC power block assembly which requires rebuilding or replacement of the assembly, and a failure of the 14 tooth gear on the fuser assembly causing the roller to either become jammed or not turn at all due to a broken tooth on the gear. Other possible causes are the halogen heater lamp, the thermal fuse or the thermistor. The halogen heater lamp may be burned out, it should have less than 5 ohms of resistance between the two pins of the connector on the right end of the fuser assembly (you will need to remove the fuser assembly from the printer to access this connector). If it measures as an open circuit the lamp or thermal fuse is burned out (these parts are connected in series). If the error can be reset by turning the machine off for 20 minutes, it is most likely the AC power block. This condition will only worsen until the error 50 is constant. If the lamp begins to heat (you can feel the roller, but be very careful it's HOT ) its not the lamp or the thermal fuse and is most likely the triac (can replace with NTE 5608 or an NTE 5645) failing when current is drawn by the halogen heater lamp. Simply replacing the Triac is not recomended, there are two resistors, R102 & R103, and a solid state switch (SSR101) which should also be replaced. We have also seen the capacitor designated as C153 on the upper board cause problems. This 22 uf 25VDC electrolytic capacitor can leak and cause shorts. You can often verify the AC power block as the problem by opening the rear door of the printer and observing the heater lamp glow when turning the printer on - a dark room is best for this test. Another clue can be a "clicking" sound just prior to the error 50 appearing. |
Tom
| | Posted on Saturday, May 11, 2002 - 3:28 am: | |
Its Mostly the AC Power Supply, go to
www.laser-service.com they have AC Power Supply's |
FunkyWalker
| | Posted on Saturday, May 11, 2002 - 12:21 am: | |
It is most likley 99% your fuser....try this first as it is only four screws....but like Mike said it could also be your power supply |
Anonymous
| | Posted on Thursday, May 09, 2002 - 5:19 pm: | |
is it the power for the laser? |
Adam Smulski
| | Posted on Tuesday, September 18, 2001 - 3:58 am: | |
LaserJet III shows SERVICE 50 after 30 seconds power on. What can I do? |
Mike
| | Posted on Tuesday, September 25, 2001 - 2:03 pm: | |
This is a common error on your model it is ether AC Power module or Fuser assembly. The best way to find out is to change one out and try it. |
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