HP LASERJET PRO M402n

[Polo-022]

I have an M402n printer. It prints totally blank pages.
I replaced toner cartridge, High Voltage contacts have been checked,
plug/jacks also, drives and coupling to toner/drum work, Laser inspected
for obstructions...
I had a same problem with an MFP HP3390 in the past...does anyone
know what is the cause of this, please?
Thanks a lot for any input.

[1stcavvet]

Re: HP LASERJET PRO M402n

is the laser shutter opening when you insert toner??? just asking

[FrohnB]

Re: HP LASERJET PRO M402n

Had one where one of the contacts that touches the cartridge/ drum was stuck inside it's hole on the frame of the machine. Popped it back out, and Voila!

[Polo-022]

Re: HP LASERJET PRO M402n

is the laser shutter opening when you insert toner??? just asking

I didn't find a laser shutter connected somehow with toner insertion or detection mechanism.
There is a white arm link but it is not connected with laser unit. Am i missing something there?

[Polo-022]

Re: HP LASERJET PRO M402n

Had one where one of the contacts that touches the cartridge/ drum was stuck inside it's hole on the frame of the machine. Popped it back out, and Voila!

I checked those contacts again and again there are three for the All In One catridge and one for the
transfer roller.