asked Nov 23, 2017 at 8:39am
Hp HP LaserJet 4

50 Service and 02 Warming Up Errors

Sporadic 50 Service and on very rare occasion hangs on 02 Warming Up

I have access to a 2nd printer and was wondering the about the logical steps to troubleshoot this. This is what I've tried so far:

Swapped fuser - still get the occasional 50 Service

Swapped power supply - still get the occasional 50 Service

What should be my next logical step?

DC Controller?

High Voltage Power Supply?


DC controller.

by moe on Nov 23, 2017 at 10:28pm Add comment

FYI. I replaced the DC controller ~1 month ago. I've probably turned the printer on and off over 25 times in that time period and no more errors.

Moe, thanks for the solid advice. Much appreciated.

by NoEcm on Jan 10, 2018 at 9:13pm Add comment

Thanks again Moe. 10 months, 200+ power cycles and 1,000 printed pages later all is good. The DC controller was definitely the issue.

by NoEcm on Oct 3, 2018 at 9:11am Add comment