Exposure Lamp Control - Minolta Di151 Service Manual

7-2.

Exposure Lamp Control

• The Exposure Lamp is turned ON or OFF by the Exposure Lamp Remote signal output
from the Control Board.
• It is turned ON or OFF at different timings between when the Power Switch is turned ON
and when the Start Key is pressed.Details;
<When Power Switch is turned ON>
1. The Exposure Lamp turns ON and the Scanner starts moving.
2. The Exposure Lamp turns ON and OFF three times to set the MAX and MIN output
voltages for the CCD.
3. The Scanner stops at the shading position underneath the scale.
4. The Exposure Lamp power checking.
5. The Scanner scans the shading sheet before returning to its home position.
At this time, it scans the white pattern and black pattern to determine the max. and
min. output voltages for the CCD Sensor.
6. After a given period of time, the Exposure Lamp goes out. Then, the Scanner
moves to, and stops at, the shading position.
The time it takes the Exposure Lamp to turn OFF is determined by the setting of C8
of Tech. Rep. Choice, the default setting being 30 sec.
<When Start key is pressed>
1. The Scanner starts moving at the shading position.
2. The Exposure Lamp turns ON and OFF several times.
3. The Exposure Lamp power checking.
4. The Scanner moves to the home position and starts a scan motion to read the orig-
inal.
5. The Scanner stops at its home position.
CONTROL SIGNAL
LA1
ON
PWB-I JP8I-1
M-11
OFF WIRING DIAGRAM
L H 6-B