Xerox 7700DX Service Manual - Page 153
Adjustments and Calibration, Internal Hard Drive
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Adjustments and Calibration The engine firmware has several built-in diagnostic routines that perform various alignment and calibration procedures. The RegiCon 685 Adjustment procedures should be used whenever the technician removes or replaces the Laser Unit, the Print Cartridge Plate Assembly, the Mark-on-Belt Assembly, Developer Housing Assembly or where color registration is bad. The printer is shipped aligned, registered and calibrated. The major disruption that can affect registration is when the NVRAM that contains the registration parameters is cleared, requiring that registration be redone. For information on resetting NVRAM see "Resetting NVRAM" on page 6-145. Internal Hard Drive The Phaser 7700 Printer has a standard hard drive installed in every printer. The hard drive boots most of the firmware. There is a special file on the hard drive that stores the specific calibration values for various sensors and for the unique positioning of the laser in the printer. ■ During manufacturing, the calibration values from the engine NVRAM have been written to the hard drive. The stored values can be written back to the engine NVRAM by performing a front panel "Reset Engine NVRAM Now" reset procedure. ■ If "resetting" engine NVRAM does not restore correct color registration, the laser geometry has probably moved in the printer, and the registration procedure must be performed. After completing the registration process, perform the engine NVRAM "store" function to store the new engine NVRAM values to the hard drive. ■ If the hard drive needs to be replaced, there is an engine NVRAM "store" function in the service diagnostics that enables the current engine NVRAM values to be written to the new hard drive. ■ If the engine control board is replaced, the NVRAM values on the hard drive need to be restored to the new board with the engine NVRAM "reset" function. Phaser 7700 Color Laser Printer Service Manual 4-123
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