Xerox WorkCentre 7525 & 7830 Families

7830 Copier

Welcoming the Newer Models to the 7425 Style

Xerox® WC 7425, 7428 & 7435 styles, 7525, 7535, 7545, & 7556 styles, and 7830, 7835, 7845, & 7855 styles)

When new models follow older models’ footprints, it’s a huge help. It helps reduce the learning curve to work on a machine that already feels familiar. Of course there are always subtle differences to be found among the newcomers—things worth knowing about which can save you plenty of head scratching time. This month, let’s have a look at the basics of the diagnostics for the newer 7525 and 7830 families in comparison to the first batch of models (7425-7435) which we had covered in ENX back in the summer and autumn of 2013.

First off, let’s talk about the differences between the supplies. The supplies changed significantly from the 74xx family that started this style out. The toner cartridges don’t fit back and forth and in fact there was a change in the formula in the toners that came with the newer models. The drum cartridges look nearly identical and share a lot of the same or very similar parts, but there are actually two important differences—the 7425 version (013R00647) naturally had a different CRUM chip (Customer Replaceable Unit Monitor) compared to the 7525 / 7830 version (013R00662). Second, there is an indexing hole in the front metal plate behind the front cover that has a different diameter when you compare the two. This causes trouble if you try to install a 7425 in a 7525 or vice versa.

The fuser modules look similar at first glance, but are almost nothing alike. The newer models utilize altogether new technology (induction heating). The older 7425 fusers had a traditional rigid heat roll and a film sleeve over a pressure pad. The new models instead of having a familiar heat roll have a heat belt, like a semi-rigid sleeve with a gear glued to the end, and conversely, it has a traditional looking pressure roller.

In addition, the document feeders and the cleaning assembly have changed as well, but the second BTR (transfer roller) is the same, as are the paper feed rolls.

Now onto something rather fascinating. The fault codes, which were published in ENX in the August 2013 issue, turn out to be very similar codes for the most part in the newer models, EXCEPT that they changed the first digit in every code from a ‘0’ to a ‘3’. For example, in the 7425 a fault code of 092-312 means ATC (Automatic Toner Concentration) Failure for Yellow, and in the newer book the same fault would appear as a 392-312. There was one important fault code I actually could not find in the newer service manual to my surprise. I saw no fault code clearly meaning IBT Belt Home Position Sensor Failure. Usually that is a fail which locks up a machine, but in the 75xx book, this code either hid extremely well, or simply wasn’t there to be found. Feels like I am missing something.

Now for getting into the Diagnostic Mode (CE Mode)

This remains almost the same as it was for the 7425 family.   Press and hold the ‘0’ button for 5 seconds, then while you’re still holding ‘0’, press ‘Start’. This will bring up the CE Passcode screen, enter ‘6789’ at the prompt and touch ‘Confirm’. Now on the newer models, that is all there is to it—you’d already be in the right screen—but on the older machines, you’d have to press the ‘Machine Status’ button and then select ‘Tools’. Next you will choose ‘System Settings’. Now in the ‘Group’ column, choose ‘Common Service Settings’ and in the ‘Features’ column, scroll down and choose ‘Maintenance / Diagnostics’.

The diagnostic menu has changed for the new models. Here are the tabs which are available on the newer models:

• Service Info: This is the default tab. Here you’ll find things like Fault History, Serial Number, Product Code, IP address, and CRU / HFSI (consumable counter resets).
• Diagnostics: This tab has choices that include the Component Control and Test Pattern Prints.

• Adjustments: Here you will find many of the diagnostic functions including the NVM Read / Write (memory adjustments), Registration, and Tone-up / Tone-down.

• Maintenance: This menu includes the Fault History for the machine.

• Call Closeout: When closing out of diagnostics you can choose to keep the fault history log or clear it. Usually it makes more sense to keep it, as it is a good record of recent faults that were already repaired.Clearing some fault codes (from Diagnostics)

• Some faults must be cleared from diagnostics before the machine will continue to work for you. For some you will need go into the Adjustments (dC131: NVM Read / Write) and reset one of the values back to ‘0’. Other codes are reset from the dC135 CRU / HFSI screen. Got to love having two acronyms in a row like that (CRU = Customer Replaceable Unit, and HFSI = High Frequency Service Items).
• When you’re done, to exit diagnostics you can press and hold the ‘0’ key and press ‘Start’ while you’re still holding ‘0’.

• Fuser Heat Control problems (310-320, and 310-372): Read below about how to reset NVM value 744-455 back to ‘0’.
• ATC Sensor failures (392-312 thru 392-315): Read about how to reset NVM values (below), and refer to the following chart for which NVM settings to set back to ‘0’.

How to use NVM Read / Write to clear any of the faults mentioned above: From the Adjustments tab look for ‘NVM Read / Write’. Next enter the ‘Chain / Link’ code mentioned for each fault code above. The “chain” is the first part of the code and the “link” is the second part of the code. For example if you want to go into 752-315, the chain would be 752 and the link would be 315. When you put in an NVM code and then select ‘Confirm / Change’ on the touchscreen, the current value will show up. Enter a ‘0’ in the ‘New Value’ column and touch ‘Save’.

• For faults 394-417 thru 493-422, these are CRU / HFSI faults, which must be reset from the Service Info tab in diagnostics. Read below about how to reset HFSI counters for the various consumable parts.

How to use CRU / HFSI to clear faults 394-417 thru 493-422: From the diagnostic mode’s Service Info tab look for and choose ‘CRU / HFSI Counters’. This screen lists the consumable items and displays Estimated Pages Remaining (or the percentage of service life remaining). Choose the HFSI item’s chain / link you need to reset and select ‘Reset Counter’.

Exiting Diagnostics:

When you’re done, to exit diagnostics you can press and hold the ‘0’ key and press ‘Start’ while you’re still holding ‘0’.

More work to be done exploring these new guys for sure, but hopefully if you were getting familiar with the 7425 family and you run into one of the newer models, this gets you started off in the right direction. Hope you all have a wonderful summer!