CAN ANYONE ADVISE TO ACCESS THE SERVICE MENU 34788 TO PERFORM THE CALIBRATION? know the process with the 20 Lb weights. just need to know what access code is required to gain in to service menu?

SOURCE: Max Paper Weight

Here ya go...

Tray 1: (standard) 16 lb. Bond – 80 lb. Cover (60 – 220 gsm), coated, Phaser High Resolution Photo Paper, labels, envelopes, business cards, Phaser Professional Solid Ink Transparencies, Phaser Weatherproof Paper, Phaser Postcards, Phaser Trifold Brochures. Media sizes: A/Letter, Legal, Executive, Statement, US Folio, A4, A5, A6, B5 JIS, B5 ISO, 3 5 in. Index Cards, custom sizes; Envelopes: #10 Commercial, DL, C5, #5 , #6 , Monarch, Booklet, Lee (A7), Choukei 3 Gou, Choukei 4 Gou, custom.
Tray 2: 525-sheet tray (standard) 16 lb. Bond – 28 lb. Cover (60 –122 gsm), coated, Phaser High Resolution Photo Paper, labels, envelopes, Phaser Professional Solid Ink Transparencies, Phaser Weatherproof Paper, Phaser Postcards,Phaser Trifold Brochures. Media sizes: A/Letter, Legal, Executive, Statement, US Folio, A4, B5 JIS, B5 ISO; Envelopes: #10 Commercial, DL, and C5.
Tray 3: 525-sheet Feeder (standard on DX) Same media weights and sizes as Tray 2.
Tray 4: 525-sheet Feeder (optional) Same media weights and sizes as Tray 2.

SOURCE: Xerox 8400 error code 37,063.45

37,063.45 The Power Supply high switch not activated. Electrical short or missing reset line.

This is what the code means.
Seems like a service call is the proper step.

SOURCE: Unable to the service menu pin code in my HP

i need to reset the maintenance kit

SOURCE: Canon LBP-5000 Printer and Calibration

I solved this problem.
You need to bring your printer to some service, and perform cleanig of the printer's optic instruments, which are most probably coverd with dirt, and printer just can't recognize catridges, and can't give you the best print quality.
Just take it to the people who refill toners, or to some official service, they'll know what to do. I had the same problem as you, and today I can't recognize how better print quality is, and more importan, printer is not asking calibration any more.

SOURCE: my printer now grabs the

It could be the paper weight. Make sure to use the specified paper types and sizes. This article in the Lexmark website on How to Troubleshoot a Paper Jam or Misfeed on a Lexmark X73 might help fix your problem.