I
SF-7300
SF-7350
~ HIGH VOLTAGE UNITS
1.
High voltage units
Drumcurrent
output
Limits
Tokranmhtwsen
HighVOMgOUnR
both@es
Main corona 4.8KVDC
—27 ~ ~, m-.
Transfercorona 4.5KVDC
—12
●1.+
+, mm.
2. Corona wire replacement
Referto the figurebakw for replacementofthe coronawire.
(Coronawire mustbe repbced at every30000 copies.)
(1) Main corona unit (MC UN)
—
Ir
k
-+11. 5+0. h
(2) Transfer corona unit
~ten
turns.
‘ 15io. 5m’
(Pr=autlons when replacing the corona wires)
(1) Tti coronatire mustnotbe twfstedorkhked.
(2) Cknths coronawirs after r~acement~ isopropand &
cohoionly.
(3) W~edry after cbening.
(4) Use the 70 microncoronawire (DWlR446=S~.
Stretchtie coronawire,
Tension sprfng
then M it at the base of
V “K;R”’ht”’w
(Transfer arena removal)
(1) Open theclam shall.
(2) RerrrovetheSorewthat hoti thetransfer coronaunit.
(3) Pull out the transfer corona unit from the rear frame side,
take care nottodamage the removertape.
Removertapa
/
TC UN
/
Rear frame side
(Pr=autlona when installing the transfer corona unit)
Insertthe protrueiti on tie transfercoronaunhintothe g- hob
of the paper gu.deE on the frontframe side.
Frontframe dde
3. High voltageunitoutputadjustments(DCD).
(3) Digitalmukhster(ormiwo ammeter).
NOTE: The meter must have a msssudng range of O to
low witha toleranceof*lYo
(2)The high voltage unit must be adjust~ for any
one of the following reasons:
(1) Afterreplacementofthemainortransfer
highvoftageunfi.
(2) Afterreplacementofthe mainor transfercoronaunit.
(3)Corona output adjustment procedures:
a.
Main corona current adjustment
(1) Remove the devdoper unit,drum unit,maincoronaunfi,and
transfercoronaunitfromthe copier.
(2) Rmovethe dischargelamP.
J I
3 to 5mm
Removethe cbaning bbde fromthe drum ho~er.
(3) Installthe MD sheetandsecure*on the drum usingtape.
7-1
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