unknown

asked Mar 26, 2003 at 12:47pm
Hp HP LaserJet 4

HP 4 service error 57

I have purchased and installed the PCA motor kit to repair the 57 service error that my laserjet 4 displayed but after replacement I am still getting the error. What else could be wrong?
Looking at the motor I replaced, it looked fine, as well as the drive gears.
Any ideas?
MARV: A "57 Service Error" on a HP 4 does indicates that there was a general motor failure, or a RELATED PROBLEM...The FORMATTER detects a main motor failure when: #1: The main motor does not come up to speed within one second of receiving drive voltages. #2: The main motor deviates from the correct speed for one second after reaching the correct speed...COULD BE SEVERAL POSSIBLE PROBLEMS. AS YOU REPLACED THE "MAIN MOTOR" ALREADY AND IT DID NOT CORRECT YOUR PROBLEM, WE WILL ASSUME THE NEW MOTOR WAS "GOOD" AND "CORRECTLY INSTALLED"...Its also possible that the GEAR TRAIN ASSEMBLY has seized, become blocked by FOREIGN MATTER/DEBRIS, or a gear has FAILED/BROKEN... Its also possible that you may have a DEFECTIVE TONER CARTRIDGE with worn, or binding gears...Its possible there is a LOOSE CONNECTOR [usually #J211] on the "DC Controller PCA Assembly", or even the main connector for the "Main Motor Assembly"...AS IT SEEMS YOUR PROBLEM WAS NOT CORRECTED WHEN YOU REPLACED THE "MAIN MOTOR", YOU MIGHT WANT TO RECHECK THE CONNECTORS, JUST TO BE SURE...THEN PULL THE "TONER ASSEMBLY" OUT AND TURN THE GEARS BY HAND, TO MAKE SURE IT TURNS FREELY. YOU CAN EVEN SWAP IT OUT FOR ANOTHER "TONER ASSY" [FOR TESTING PURPOSES], IF YOU ALREADY HAVE AN EXTRA REPLACEMENT ON HAND. DON'T BUY ANOTHER "TONER ASSY" UNTIL YOU KNOW FOR SURE THAT THE ONE ALREADY IN THE PRINTER IS BAD...VISUALLY INSPECT ALL THE DRIVE GEAR ASSEMBLIES...Good Luck! Denny Conway
by Denny Conway on Mar 26, 2003 at 2:02pm Add comment
Typically a 57 error is caused by either the motor or the DC controller. When you remove the formatter cage to access the motor, you can get to the motor flywheel and turn it without removing the motor. Because of the gear ratios in the drive train, it should turn easily. If you can turn the motor 15-20 times without encountering much resistance and it turns smoothly, I would guess that you don;t have a bind in the gears. Assuming you reconnected everything properly, your next likely suspect would be the DC controller. 99 percent of the time the motor fixes the problem.
by david belton on Mar 27, 2003 at 5:30am Add comment
Could also be a hard turning fuser.
by Norm on Mar 27, 2003 at 7:45am Add comment
Thanks for the advice Denny, David, and Norm.
I know for a fact that the drive train gears are fine. Moe's video includes checking them out or replacing them if necessary so I did that when I replaced the motor. I will look at the toner cartridge, connectors and DC controller next. I'll let you all know if I find the source of the problem.
by unknown on Mar 27, 2003 at 8:49pm Add comment