Sharp SF-7300 Service Manual page 29

(lo) Measure the current at the front and rear frame sties. The
currentd.fierence mustbe *thin 2.@.
a.
b.
Turn the main power on and enter test command 9. The
main hgh vobge unkwill activatefor 30 seconds.
Measure the dmm current at the front and rear frame
sides.
When the teat harness microswitch is off, the front
frame tie currentis indicatedon the meter.
When the test harness microewitchb on, the rear frame
side drum currentis indkated on the meter.
,(OFF)
,(ON)
c. MAe sure that a current difference k not greater than
2.@.
If the current d~erence is greater then 2.@, repface the
corona unit.
(11) Adjuetthe MHVG outputcurrent.
Turn the main power on and enter test command 9. The
main highvohge unitwiflactivatefor 30 SSC*.
Adjustthe MHVG output adjusting@ kcated on the high
vobge unit so that the MHVG outputcurrentshouM be at
27*.
b. Transfer corona output adjustment:
(1)
(2)
(3)
(4)
Connect the ND t&t lea&to the meter, in reference to (3)-
a~ to 0.
Cban the transfer corom wire, and mount the tranafer
corona urrft m the copier. The main corona unit may be
mounteddurfngthe measurement.
Performthe procedure(3)-a@ to 0.
Measure the current at the front and rear frame sides. The
ourrentd.tierence mustbe-in 2.~.
a. Turn the main power on and enter test cornmd 10. The
transferhighvoftegeunitwiflactiate for30 seconds.
b. Measure the drum current at the front and rear frame
Skks.
When b teat hameae microewitch is off, W front
frame aide currentis indbated on the meta.
When the test harness mfcroawitch k on, the rear frame
sfdedrum currentis itikated on the mater.
/(OFF)
,( ON)
4
c. M+e sure that
a
currant difference b not greeter than
2.W.
If the current difference is greater than 2.%, reptace the
corona unit.
(~ Adjuetthe THVG outputcurrerrt.
Turn the main power on and enter teat command 10. The
transferhighv~e unitwill actfvatefor 30 seconds.
Adjuetthe THVG outputadjustingpot focatedon the highvoR-
age urrkso that the MHVG outputcurrent ehouM be at 12.0
*1.*.
SF-7200
SF-7M
C.
Adjuetingpot Iomtlons
THV6
pot
Rear frame stie
..