Ricoh C249 Service Manual page 71

3.6.9 2ND DRUM MASTER SENSOR ADJUSTMENT
Ensures that the sensor detects if there is a master on the drum.
[A]
Standard: 2.0 volts (within "+0.1" and "-0.1"volts)
Tools: Circuit tester
• Rear cover (! 3.3.2)
1. Confirm that the master is wrapped on the drum.
2. Connect the terminals of a circuit tester to TP104 and a grounded place (e.g.
iron base)
3. Connect the power plug, and turn on the main switch to access SP mode.
4. Select SP6-53 (2nd drum master sensor voltage) and press the master-making
key.
5. Measure the voltage, and turn VR104 so that the value becomes between "-
0.1" and "+0.1" volts from the standard value (2.0 volts).
6. Turn off the main switch, then remove the master that is wrapped around the
drum and install the drum in the main body.
7. Turn on the main switch to access SP mode.
8. Select SP6-53 (2nd drum master sensor voltage) and press the master-making
key.
9. Check if the value of the voltage becomes below 0.8 volts.
10. If the voltage is not correct, clean the black patch [A] on the screen.
NOTE: When the value of the voltage does not become the standard value, adjust
the threshold level of the 2nd drum master sensor. (SP6-53 : 2nd drum
master sensor voltage)
Standard Value
Master being
2.0 ±0.1V
SM
C249R126.WMF
Threshold level (SP6-53)
1.0V
3-21
MASTER FEED
Standard Value
Master nothing
Below 0.8V
C249