Sharp FO-3150 Service Manual page 18

FO-3150U/C
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).
–
DC-Bias
Output voltage check
+
3
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
–
Note: For measurement, do not remove Printer PWB from the bottom
plate.
DRUM
DC-Bias
–
DC-Bias
Output voltage check
+
VR2
(DV bias output adjustment volume)
D7
D8
DRUM
+
Transfer changer
Output voltage check
–
2 – 2
VR1 (MC output voltage adjustment volume)
Fig.3
VR1 (MC output voltage adjustment volume)
Fig.4