4-74 Service Manual
5025-2xx, 4xx
Installation notes
• Before beginning the installation of the new left or right toner density sensor, note the 32-digit TPS value
printed on the barcode on the new FRU.
• After installation, perform the TPS Setup. Enter the factory preset alignment number.
1. Enter the Diagnostics Menu:
a. Turn the printer off.
b. Press and hold and .
c. Turn the printer on.
d. Release the buttons when the installed memory and processor speed displays.
2. Select TPS SETUP from Diag Menu, and press Select ().
3. Select Right or Left, and press Select ().
TPS Right 1-16 or TPS Left 1-16 appears above a blinking 0 in the left position.
4. To enter a character or digit:
a. Press to decrease or to increase the blinking value.
b. Pause for several seconds without pressing any buttons. The blinking value becomes solid.
If the value is incorrect, use Back ( ) to go back and reenter the number.
c. Continue until the last value is reached.
d. When the last of the 16 values is entered and becomes solid, TPS Right 17-32 or
TPS Left 17-32 appears.
e. Continue entering and pausing.
5. After the 32nd number is entered and becomes solid, the number is automatically entered.
• If the number is incorrect, Checksum does not match appears, and the original screen appears
to reenter the value.
• If the number is correct, Saving changes to NVRAM appears.
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