Resetting Fault Codes for the Families in the Xerox DC250 Style

Xerox Families: 550/C70, DCP700, J75/C75, DC250/DC260, WC-7675 and WC-7775

An increasingly common topic, which has been asked about many times over, has to do with resetting fault codes from diagnostics on the more recent families in the DC250 style. In a previous article, we looked at similarities and differences among the many families in this series, but the fault codes were not addressed at the time.

This is because even though they remained familiar, the memory codes that need to be reset to “0” to clear the faults change for each new family of machines. So let’s first have a peek at some of the subtle changes in the diagnostic-access procedures and how to navigate the diagnostic menus. Then, we’ll cover the faults that require resetting, and see what’s changed over the years.

The procedure for getting into UI (User Interface) Diagnostics and navigating the menus to find “NVM Read/Write” depends on which family of machines you’re working on. Important: do not use the other function “NVM Initialize” to try to clear faults unless you have the tools and firmware and backup files to restore the machine to its original settings. (Note: NVM stands for Non Volatile Memory)

Fault Code Description NVM value:
Must Reset to “0”
For DC240/250,
For 550/560/570
For DCP700/700i
(*770 ONLY)
For C75/J75
Fuser Heat Control
Reset to 0: 744-351 744-351 744-361
745-092 &
Fuser Overheat Reset to 0: 744-350 745-416 744-360
745-092 &
Fuser Failure Reset to 0: 744-352 744-352 744-352 744-092 &
IBT Belt Home Sensing Problem Reset to 0: 741-105 741-119 741-106 741-132
Toner Dispense Problem (Yellow) Reset to 0: 762-312 762-368 762-312 762-316
Toner Dispense Problem (Magenta) Reset to 0: 762-313 762-369 762-313 762-317
Toner Dispense
Problem (Cyan)
Reset to 0: 762-314 762-370 762-314 762-318
Toner Dispense Problem (Black) Reset to 0: 762-315 762-371 762-315 762-319

Accessing Diagnostics, and how to get into “NVM Read/Write”

DC250 Family (DocuColor) DC-240/242/250/252/260

  1. Hold down the “0” button for five full seconds, and while still holding the “0,” press “Start.” A prompt for a password will show up (the “CE Access Number”).
  2. Use the default password “6789,” and press “Confirm.”
  3. Press the “Log-in/out” button.
  4. On the touchscreen, press “System Settings,” “Common Settings” and finally “Maintenance/Diagnostics.”

Here you’ll find a menu option for “NVM Read / Write.”

DC700 Family (Digital Color Press) DCP-700/700i/770 or 550 Family (Color) 550/560/570, C60/C70 or J75 Family (Digital Press) C75/J75

These three families are almost the same as the DC250 Family above, but instead of pressing “Log-in/out,” press “Machine Status” instead. Then choose the “Tools Tab” up top. The rest is the same as DC250.

WC-7675 Family (WorkCentre) WC-7655, 7665, 7675 or WC-7775 Family WC-7755, 7765, 7775

  1. From the fault code screen, hold down the following three buttons for about 10 seconds: “#,” “*” and “Stop.”
  2. When the diagnostic login screen asks for a password, type in the code “6789” and press “Enter.”
  3. Wait a few minutes as the machine reboots into the Service Diagnostics screen. Here you will see several tabs across the top.
  4. Touch the “Adjustments” tab where you’ll find “NVM Read/Write.”

Now that you have a clear shot to get to the “NVM Read/Write screen,” let’s have a look at the Fault Codes that require resetting. In each case, it’s important to first address what caused the fault and correct the problem before resetting the memory codes. The machine is protecting itself from someone trying to run copies or prints while it’s still in the error condition. If you don’t address the problem which triggered the fault, in most cases the fault code will come back in very short order.

Fault conditions that require resetting include fuser faults relating to temperature control, transfer-belt home-position sensing faults and toner-dispense failures.

Note that some models use a “3” as the first digit in the fault codes, while most of the machines use a “0” as the first digit. So, the fault 310-319 has the same meaning as 010-319.

That wraps it up. With these few details in hand and the basic Tech Info sheets for the DC250 style, you’ll be better equipped to fix any of the models in the entire series. Happy repairs, everyone!

Britt Horvat
About the Author
Britt works for The Parts Drop, a company whose primary business is providing parts, supplies and information for Xerox brand copiers, printers and fax machines. You can find more information, including many of Britt’s past ENX articles on their website, . If you’d like to read more about Xerox brand office equipment, there’s also a complete listing of past articles under contributing writers on the ENX website (