LJ 4m Plus not printing 600 DPI

[EasilyOdd]

I have a Laserjet 4m Plus that will not print at 600 dpi no matter what I seem to do. The printer is set to default to 600 dpi. At least that is what I assume MENU -> JOB MENU -> RESOLUTION=600* means.

It happens from both Windows and Linux. The same machines print 600 dpi on other LJ 4m Plus' around the offices.

There are no error codes.

From the MIO section of the test page it says it has a Jetdirect J2552B network card in it with revision A.08.40.

There is a firmware datecode of 19931201 on the test page also.

Is there a place where I can get the latest and greatest firmware for this thing? I've searched my eyes crossed on HP's web site.

Any help will be appreciated.

Thanks

EO

[JJprinter]

Print a test page from the other machines and see if everything is the same with the firmware codes
If so
Check what driver was installed in the other printers if the same or slightly different, if different get new driver
Not sure where to go to get firmware updates
No tech here
Try www.driversguide.com for new drivers.
Or HP site.

Good Hunting