Blue Photoreceptor Belt Installation
(Phase two)

By Raymond Cote

In last month’s column we started to prepare the Xerox 5090 (and family of copiers) for the installation of the Blue Belt (Xerox part number 1R538). Once the mechanicals have been performed and all adjustments have been verified, our next step is to make a few basic changes in the NVM values. Hopefully the Optics Cavity is finger-lickin’ clean or it has just been painted: we want to ensure that the walls of the Optics Cavity will be reflecting the light at its peak value. Ensure that the platen glass is clean and free of all abrasions (from the RDH belts). New flash lamps and cooling tubes will make the transaction a smooth one.

Procedure

Change the following NVM MIN values in DC-131 using the following table below.

 We are now ready to install the Xerox Blue Belt. Open the belt module assembly and replace the brown belt with the blue one. NOTE: If you are not using a Xerox brand Blue Belt, you may notice that the belt has considerable curl to it (especially under the dicorotron area) and may actually touch the dicorotrons while running, causing it to arc out. It is recommended that you use the “edge curl kit” also supplied by the vendor who sold you the Blue Belt. Once the blue photoreceptor is installed and the belt module is closed, then:

1) Select DC-951 “INITIALIZE” and record the values on a blank piece of paper. Label the sheet INITIALIZE (with the date and time) and place it in a safe place for future reference.

2) Select DC-909

 a) Select [500 copies]

 b) Position the Xerographic test pattern 82E2770 on the platen glass.

 c) Select [Test Display] and press “Start Print.” After 75 to 85 copies, press “Stop Print.”

NOTE:

In the next two steps we will be setting the ID LAMP and FLASH LAMP exposure(s) to the correct levels. Take notice that the target voltage for ESV2 on the test target should be approximately 10-20 volts more than the voltage for the ESV(s) 1, 3, and 5.

Next comes the hard part. It has been noted that some 5090s are difficult to achieve the ideal values. Try to keep in mind that at this point we should be looking to get it as close as we can to the ideal values.

3) Flash Lamp intensity set-up (MIN location 169)

The ESV should be set between 50 and 90—the ideal setting is about 60.

This adjustment is done in DC-131 MIN Location 169. The value can be adjusted (decreased) by increasing the value in DC-131 MIN location 169. Be careful not to exceed 185 or you may cause an additional stress on the Illumination Power supply. Keep focused on the value in DC-909; the ESV2 value should be as close to 60 as possible.

4) ID LAMP Output level (Setting up)

The reading (in DC-909) for ESV 123 should be between 30 and 70, with 45 being the best setting.

We can increase the value (for the ESV reading) by decreasing the MIN value in location 136 by two (2) bits at a time. It may be a little bit of a pain in the neck to obtain the ideal setting (going back and forth in DC-909) but eventually you will get it where you want it.

5)  Toner Concentration is something that you may have to do visually by inspecting the copies by hand. Change the value in DC-131 MIN location 250 until the density is where you think it should be.

6)  Run about 500 to 1,000 copies of the ZIP Tone Target (test pattern) or use the Xerographic test pattern (82E2770) if you don’t have one.

7)  Reset the value in DC-107 to zero, for the photoreceptor belt counter.

Restoration for the brown belt

If for some reason you want to restore the Xerox 5090 copier to the original brown belt state, there are three things that should be done before you run DC-951. Change the photoreceptor belt to the new brown one (1R88) and then make the two changes in the MIN Locations in DC-131 as shown below.

Next month we will be examining the root causes of ozone deletions in the Xerox 5090 family and Docutech NP-135 family of copier/printers. If you have any concerns or questions about Ozone deletions, please email me with the details and I will try to address them for you. Ozone deletion is a serious problem in the field and it should be addressed before it gets out of hand.

If you have information that you would like to share with the field, please feel free to submit your ideas to VillageCopierNY@aol.com and I will place your suggestion or fix in the next issue of ENX. From what I hear in the field, it seems that many ex-Xerox technicians miss the field engineering team in Rochester, N.Y. Somehow it was always reassuring to hear a voice on the other end of the phone and a field engineer making a suggestion for a fix on your problem