Ricoh DD 4450 - Master End Sensor Adjustment

Master Feed
SM 4-47 C279
Replacement
and
Adjustment
4.7.10 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 (
p.4-10 "Rear Cover")
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.
 Insert the core so that the piece of master [A] faces towards the master end sensor.
4. Connect the power plug, and turn on the main switch.
5. Measure the voltage with the circuit tester, and turn VR101 until the value becomes between
“-0.1” and “+0.1” volts from the standard value (1.8 volts).
 Please refer to the following table for the standard voltages.
 If the voltage cannot be adjusted to the standard value, do not change the threshold
level using SP6-50 (Master end sensor voltage).
When set a new roll
(master present)
Standard value
Master end (4 layers of
master on the core)
End mark only
Above 3.0V Below 2.0V Below 0.8V