Service manual

FO-2970MU

2 – 2

DC bias output voltage adjustment

Adjust VR2 so that the output voltage is –310V ±5V

For measurement, use the high voltage tester (effective value me-

ter).

VR1 (MC output voltage adjustment volume)

–

DC-Bias

Output voltage check

VR2

(DV bias output adjustment volume)

DC-Bias

Output voltage check

–

DRUM

DC-Bias

Transfer charger voltage check

After MC output voltage adjustment and DC bias output voltage ad-

justment, check transfer charger voltage.

Check that the output voltage is +3200V ~ +3700V.

For measurement, use a high voltage tester (effective value meter).

Transfer charger

Output voltage check

–

DRUM

Note: For measurement, do not remove Printer PWB from the bottom

plate.

VR1 (MC output voltage adjustment volume)

–

Transfer changer

Output voltage check

Fig.3

Fig.4