LaserJet 4MP Please Help!

Question

My old LaserJet 4MP is printing beautifully. I have just fixed a series of malfunctions with removal of paper debris and a cold reset.
But one problem remains. After printing a document the printer no longer returns to a READY state. Instead a document name with a number prefix remains in the window. I have to do another reset to clear the document description out of the buffer. Then the printer re-starts, runs its SELF TEST and reverts to READY. While the document description remains I cannot go offline but I can continue printing other documents in the print queue until finished. Then I get a plain sheet chugging out with an error message. (see below).
According to my manual, The number prefix is not an error number, it appears to be a document counter number as it increases with each print I make. it is up to 106 now.
When offline I can run ALL print tests and come up with perfect results.
I would have thought a cold reset would fix this problem by returning the software to factory settings. Apparently not. Window simply shows: 
89 Tony ANZ Lodg
I have been using the printer so the last print was:
106 Tony GreeceL 
So I get a counter number, My name and a document description as far as 16 characters will allow.
Sometimes, as in the last document a second sheet prints displaying; 
ERROR: timeout
OFFENDING COMMAND: timeout
STACK:
This error prints every time I printed a document. I visited all the items in the JOB MENU. I re-set JOB MENU items but no change in printer behaviour.
Normally after printing a letter the Printer switches back to the READY state. Now the document description remains in the window and can only be removed by a cold reset, I cannot go OFFLINE because the window will not clear and revert to READY. It is interesting that the reset presumably clears the buffer but even a cold reset does not change the document counter number. How does one access this data I ask?
The printer is networked via a D-Link DP-G321 WiFi print server connected via serial cable to the LaserJet 4 MP. My G5 iMac and a G4 desktop both access the print server via WiFi. I have trashed and replaced the printer drivers and print proxy preferences on both the G5 and G4 computers to ensure the glitch is not transmitted from the computers.
I assume this can be fixed via the printer onboard software. Can anyone help me fix this problem?

Answer 1

Anyone know if this will also work for 10.5.6? As obviously Apple has not fixed this issue yet!
I need advice on this since I cannot print from Illustrator at all ever since I reinstalled HP drivers 1.1.1 at Software Update's Recomendation.
QUOTED FROM A PREVIOUS APPLE THREAD I FOUND DATED OCTOBER '08 (as follows)
Found a great solution to this on the Adobe User Forums that involves replacing the pstops file in 10.5.5 from the one in 10.5.4. Here're the steps:
Through trial and error, it appears to be a problem in the file located at:
/usr/libexec/cups/filter/pstops
If you copy that file from a working 10.5.4 installation then it should work. At least it does for me. Your mileage may vary, I'm not responsible, etc.
The easiest (and likely safest) way to do this is to download the 10.5.4 combo update from Apple.
http://www.apple.com/support/downloads/macosx1054comboupdate.html
And Pacifist:
http://www.charlessoft.com/
1) Mount the combo update DMG and open the .pkg file using Pacifist.
2) Navigate down to /usr/libexec/cups/filter/
3) click on pstops and hit "install" on the top left
4) enter your password
5) hit replace
That's it. Keep in mind I've only tested it on my main box, but I don't see why it shouldn't work for everyone else.
This likely will not break your install in case Apple comes out with a fix. If you're worried then just backup your 10.5.5 pstops file. (hit Command-G, enter /usr/libexec/cups/filter/ and copy the pstops file somewhere safe (or just rename a copy in the current location). You may have to repair your permissions.