Sharp SF-7300 Service Manual page 17

I
G,* .-,-
.
(4)
Optical blink
.
The ytfcsl Mock consistsof a fixed focus kne and six mirrors.
Because a tied focus hs ia used, the No.4 and 5 mirrorsare
)
movd accordf~ to the ms~ifiiation ratio, to ch~ the dis-
tance be~een the document and tie drum (OID: Original Image
Distance).
A steppingmotor is emptoyed to move the kne and mirrorloca-
tionsto four steps of magnificetin. The SF-~00 does not incor-
poratethe msgniffcationfeature.
Mirrorb~ drivevvire
No.2 mirror
\
SF-73W
SF-7350
Exposureis contrded by v@~ the copy tip wkage. The AE
senew is in tie copy hmp unk to sense documentcontrast.L@ht
reffected from the document ia received by the AE sensor to
determine exposure.
sri
exposure c~trol method is used fw the mov~ riht source
(stationaryplaten).
Therrn4 fuse
NO.4 mirror
No.1 mirror
R~ector
Copy lamp /
Tsbk glass
/
~
F-d movement
..— ..—
..— .— -.
— . —..
No.5 mirrw
)
(SF-7350
top view)
Dia~arge lamp ~
clutch
s peed
*ift*a
Clutd unit
I
Clut& connection~ar
MFC
(e
/
MRC
MORS
MHPS
II
Sqing motor
\
_re ~ntrd Pk~
\
Lensdrivetire
I
/ \, y
I 1— /
!
No.45
mirror
,beae drive-m
I
I
\
No.~3 mirrorbase unit
I
Copy lamp unit
No.W5 mirrorbase unit
AE sensorslit