Ricoh A028 Service Training Manual page 58

Optics
Right shield screen
The shield area of the right shield screen is determined
by magnification data and paper size.
The figure on the right shows the right shield screen stop
position by paper size and magnification.
For 142% magnification during actual operation, the
shield area becomes larger than the 100% position, but
the exposure area corresponding to paper size is
maintained.
NOTE
The table below shows the length of the exposure
area for A4 size paper (210 mm long).
Magnification Shield Position
142% Left shield
Right shield
100% Left shield
Right shield
64% Left shield
Right shield
2.2.6 Anti-condensation mechanism
An anti-condensation heater is attached to the side of
the optical unit. The heater prevents condensation on
the optics and is energized when the main switch is
turned off. A thermofuse in the heater is set at 169°C.
Exposure Area
24 mm 257 -- 24 = 233 mm
257 mm
55 mm 300 -- 55 = 245 mm
300 mm
43 mm 283 -- 43 = 240 mm
283 mm
Right shield screen shield area
2nd mirror
Flash safety switch
2-22
1 July 1994
Anticondensation heater
(with thermofuse)