Service Manual

&23<352&(66
6WHS2SWLFDOGLVFKDUJH6HPLFRQGXFWRUODVHU
%HIRUH WKH GUXP URWDWLRQ LV VWRSSHG WKH VHPLFRQGXFWRU ODVHU LV
UDGLDWHGRQWRWKHGUXPWRUHGXFHWKHHOHFWULFDOUHVLVWDQFHLQWKH23&
OD\HUDQGHOLPLQDWHUHVLGXDO FKDUJH SURYLGLQJDXQLIRUPVWDWHWR WKH
GUXPVXUIDFHIRUWKHQH[WSDJHWREHSULQWHG
:KHQ WKH HOHFWULFDO UHVLVWDQFH LV UHGXFHG SRVLWLYH FKDUJHV RQ WKH
DOXPLQXP OD\HU DUHPRYHGDQG QHXWUDOL]HG ZLWK QHJDWLYH FKDUJHVRQ
WKH23&OD\HU
&KDUJHE\WKH6FRURWURQFKDUJHU
)XQFWLRQ
7KH6FRURWURQFKDUJHUIXQFWLRQVWRPDLQWDLQXQLIRUPVXUIDFHSRWHQWLDO
RQWKHGUXPDWDOOWLPHV,WFRQWUROWKHVXUIDFHSRWHQWLDOUHJDUGOHVVRI
WKHFKDUJHFKDUDFWHULVWLFVRIWKHSKRWRFRQGXFWRU
%DVLFIXQFWLRQ
$ VFUHHQ JULG LV SODFHG EHWZHHQ WKH VDZ WRRWK DQG WKH
SKRWRFRQGXFWRU $ VWDEOH YROWDJH LV DGGHG WR WKH VFUHHQ JULG WR
PDLQWDLQWKHFRURQDFXUUHQWRQWKHSKRWRFRQGXFWRU
$V WKH SKRWRFRQGXFWRU LV FKDUJHG E\ WKH VDZ WRRWK IURP WKH PDLQ
FRURQDXQLWWKHVXUIDFHSRWHQWLDOLQFUHDVHV7KLVLQFUHDVHVWKHFXUUHQW
IORZLQJWKURXJK WKH VFUHHQ JULG :KHQWKH SKRWRFRQGXFWRUSRWHQWLDO
QHDUVWKHJULGSRWHQWLDOWKHFXUUHQWWXUQVWRIORZWRWKHJULGVRWKDWWKH
SKRWRFRQGXFWRUSRWHQWLDOFDQEHPDLQWDLQHGDWDVWDEOHOHYHO
3URFHVVFRQWUROOLQJ
)XQFWLRQ
7KH SULQW SDWWHUQ VLJQDO LV FRQYHUWHG LQWR DQ LQYLVLEOH LPDJH E\ WKH
VHPLFRQGXFWRUODVHUXVLQJQHJDWLYHWRSRVLWLYHUHYHUVLEOHGHYHORSLQJ
PHWKRG7KHUHIRUHLIWKHGHYHORSLQJELDVLVDGGHGEHIRUHWKHGUXPLV
FKDUJHGWRQHULVDWWUDFWHGRQWRWKHGUXP,IWKHGHYHORSLQJELDVLVQRW
DGGHGZKHQWKHGUXPLVFKDUJHG WKHFDUULHULVDWWUDFWHG WRWKHGUXP
EHFDXVHRIWKHVWURQJHOHFWURVWDWLFIRUFHRIWKHGUXP
7RDYRLGWKLVWKHSURFHVVLVFRQWUROOHGE\DGMXVWLQJWKHGUXPSRWHQWLDO
DQGWKHJULGSRWHQWLDORIWKH6FRURWURQFKDUJHU
%DVLFIXQFWLRQ
9ROWDJH DGGHG WR WKH VFUHHQ JULG FDQ EH VHOHFWHG KLJK DQG ORZ 7R
PDNHLWHDVLO\XQGHUVWRRGWKHILJXUHEHORZVKRZVYROWDJHWUDQVLWLRQDW
WKHGHYHORSHUXQLW
6WDUW
 %HFDXVHWKHJULGSRWHQWLDOLVDWDORZOHYHOWKHGUXPSRWHQWLDOLVDW
DERXW 9 &DUULHU PD\ QRW EH DWWUDFWHG WKRXJK WKH FDUULHU LV
SXOOHGWRZDUGVWKHGUXPE\WKHHOHFWURVWDWLFIRUFHRI9
 'HYHORSLQJ ELDV 9 LV DSSOLHG ZKHQ WKH SKRWRFRQGXFWRU
SRWHQWLDOLVVZLWFKHGIURP/2:WR+,*+
 2QFHGHYHORSLQJELDV9LVDSSOLHGDQGWKHSKRWRFRQGXFWRU
SRWHQWLDOULVHVWR+,*+WRQHUZLOOQRWEHDWWUDFWHGWRWKHGUXP
6WRS
7KHUHYHUVHVHTXHQFHWDNHVSODFH
5HWDLQLQJGHYHORSLQJELDVDWDQDEQRUPDORFFXUUHQFH
)XQFWLRQ
7KH GHYHORSLQJ ELDV ZLOO EH ORVW LI WKH SRZHU VXSSO\ ZDV UHPRYHG
GXULQJSULQWSURFHVV,QWKLVHYHQWWKHGUXPSRWHQWLDOVOLJKWO\DEDWHV
DQGWKHFDUULHUPDNHVGHSRVLWVRQWKHGUXPEHFDXVHRIVWURQJVWDWLF
SRZHU 7R SUHYHQW WKLV WKH PDFKLQH LQFRUSRUDWHV D IXQFWLRQWR UHWDLQ
WKH GHYHORSLQJ ELDV IRU D FHUWDLQ SHULRG DQG GHFUHDVH WKH YROWDJH
JUDGXDOO\DJDLQVWSRVVLEOHSRZHUORVV
%DVLFIXQFWLRQ
1RUPDOO\ WKH GHYHORSLQJ ELDV YROWDJH LV UHWDLQHG IRU D FHUWDLQ WLPH
EHIRUHWKHGUXPFRPHVWRDFRPSOHWHVWRSLIWKHPDFKLQHVKRXOGVWRS
EHIRUHFRPSOHWLQJWKHQRUPDOSULQWF\FOH7KHGHYHORSLQJELDVFDQEH
DGGHG EHIRUH UHVXPLQJ WKH RSHUDWLRQ DIWHU DQ DEQRUPDO LQWHUUXSWLRQ
7KHUHIRUHFDUULHUZLOOQRWPDNHDGHSRVLWRQWKHGUXPVXUIDFH
Semiconductor laser
0
START STOP
Print potential
Toner attract
potential
2)
3)
1)
Low
4)
High
Drum potential
Developing bias
Time