Ricoh VT3500, Service Manual

Page: 257 / 330

5. MASTER EJECT SECTION
5.1 ADJUSTING THE MASTER EJECT SENSOR
Purpose: To ensure that the sensor detects the ejected master.
Adjustment Standard: 0.8 to 0.9 V when no master is detected.
1. Make a master that has a solid black area as follows. The solid black
area should be about size A7 (74 x 105 mm/3" x 4"). Using a solid black
test master ensures testing the sensor under worst case condition.
a. Set the original with the solid black area on the original table.
b. Make some prints.
c. Stop printing when the image density of the solid black area on the
print stabilizes.
d. Remove the master from the drum.
NOTE: To prevent the thermal head from overheating, do not use a large
solid black original.
2. Set the drum unit and the master eject box.
3. Confirm that the voltage between TP104 and the GND line TP107 on the
main PCB is 0.8 to 0.4 V when the master is not under the master eject
sensor.
4. If it is not, adjust it by truning VR104 on the main PCB.
5. After adjusting, insert the master [A] between the upper and the lower
eject rollers with the master film side up and position the solid black area
under the sensor. Then confirm that LED104 turns on.
[B]
[C]
[A]
1 December 1993
5-23