Ricoh C249, Service Manual

Page: 72 / 486

MASTER FEED
C249 3-22 SM
3.6.10 MASTER END SENSOR ADJUSTMENT
Ensures that the sensor detects the end mark (a solid black area) on the master
roll.
Standard: 1.8 volts (within “+0.1” and “-0.1” volts)
Tools: Circuit tester, the core of a used master roll (the core has no master)
•
Rear cover (
!
3.3.2)
1. Connect the terminals of a circuit tester to TP101 and to a grounded place (e.g.
iron base).
2. Put a piece of master [A] on the used master roll.
3. Place the core of the used master roll inside the master-making unit, and close
the master-making unit.
NOTE: Detect a low fiber content paper side of a piece of paper to the master
end sensor.
4. Connect the power plug, and turn on the main switch.
5. Measure the voltage, and turn VR101 so that the value becomes between “-
0.1” and “+0.1” volts from the standard value (1.8 volts).
NOTE: When the value of the voltage does not become the standard value, adjust
the threshold level of the master end sensor. (SP6-50 : Master end sensor
voltage)
Standard Value
Master being
Threshold level (SP6-50)
Standard Value
Master nothing
Below 1.8V 1.9V
2.0
±
0.1V
TP101
VR101
C249R118.WMF
C249R114.WMF
[A]