Specifications
➂
T/C Control Level Setting (Correction)
The copier produces a solid-black pattern on the PC Drum and the AIDC
Sensor reads the image density (ID) of the pattern. If the ID reading is
found to fall outside the specified range, the copier increases or
decreases the T/C control level by 0.5%.
Control
The intensity of the AIDC Sensor LED light is set to a level three times
as strong as the normal one and grid voltage (V
G
) is output at a level
45V lower than usual.
With the Exposure Lamp turned OFF, the Image Erase Lamp is kept
OFF for a given period of time to produce a solid-black pattern.
The input to pin 79 of IC1A at this time is sampled. ... A
The AIDC Sensor LED light intensity and V
G
are returned to the normal
level.
The T/C control level is set as follows according to the voltage of A.
Voltage A T/C Control Level
4.3V or higher 0.5% lower
4.1 to 4.3V As is (5% if upon setting-up)
4.1V or lower
0.5% higher (Auxiliary toner replenishing is carried out for
about 60 sec. upon F5 operation.)
➃
Optimum Exposure Lamp Voltage Setting (Correction)
The copier produces a halftone pattern on the PC Drum and the AIDC
Sensor reads the ID of the pattern. The copier adjusts the Exposure
Lamp voltage (V
L
) to obtain a good ID.
The following four different types of controls are provided for the
optimum Exposure Lamp voltage correction. Control (3) is not provided if
the input to pin 79 of IC1A is outside the specified range (3.85 to 4.45V)
as checked through the T/C control level setting performed immediately
before control (3).
(1) The optimum Exposure Lamp voltage is adjusted at the initial setup or
when the first F5 operation is run after the PC Drum has been
replaced with a new one (the PC Drum counter has been cleared).
(The adjustment value should fall within the range 50 to 82V, in 1V
increments.)
Control
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 varied so that voltage A becomes 1.6V or as near 1.6V as
possible.
M-21