Specifications

(2) A correction is made when the second or subsequent F5 test
operation is run after the Exposure Lamp has been cleaned or "Exp.
Lamp Manual Adj." setting of Tech. Rep. Choice changed. [The
correction should be in the range between +2 and −4V with respect to
the optimum Exposure Lamp voltage set in (1).]
Control
The Exposure Lamp voltage (V
L
) is set at a value set in (1) minus 4V.
LA1 is turned ON to illuminate the halftone patch on the back of the
Original Width Scale and LA3 is kept OFF for a given period of time to
produce a halftone pattern.
The input to pin 79 of IC1A at this time is sampled. ... A
V
L
is increased 1V at a time so that voltage A becomes 1.6V or as near
1.6V as possible.
(3) A correction is made of the Exposure Lamp voltage when the Power
Switch is turned ON first thing in the morning to compensate for any
drop in the surface potential of the PC Drum in the morning (One-shot
correction).
(4) A correction is made to compensate for any drop in the intensity of
LA1 light occurring due to a contaminated optical system. This is done
for every 200 copies made after the Power Switch has been turned
ON.
Control for (3) or (4)
With the Exposure Lamp voltage set by (1) or (2) :
LA1 is turned ON to illuminate the halftone patch on the back of the
Original Width Scale and LA3 is kept OFF for a given period of time to
produce a halftone pattern.
The input to pin 79 of IC1A at this time is sampled. ... A
The Exposure Lamp voltage is corrected as follows according to
voltage A.
Voltage A Exposure Lamp Voltage
1.8V or higher Corrected by +1V
1.4 to 1.8V Not corrected
1.4V or lower Corrected by −1V
M-22