Sharp FO-3150, Service Manual

Page: 18 / 156

FO-3150U/C
2 – 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
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
+
–
DRUM
D7
D8
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