Ricoh LDD250, Service Manual

Page: 149 / 459

DRUM SECTION
C262/C265 3-74 SM
3.8.9 1
ST
DRUM MASTER SENSOR ADJUSTMENT
Purpose: To ensure that the sensor detects the master properly.
Standard: 1.0 to 1.2 volts
CAUTION: 1) The sensor adjustment is required in the following cases:
-When the sensor is replaced.
-When the I/O board is replaced.
2) While adjusting, make sure to attach all exterior covers to avoid
external light.
3) Do not turn the VRs excessively.
4) If the sensor is dirty, clean or replace it.
5) For how to access SP mode, refer to the Service Program Mode
section. ( 5.3.1)
•
Rear Cover ( 3.2.2)
1. Remove the master that is wrapped around the drum, and install the drum in
the main body.
2. Turn on the main switch, then access SP6-004-5 (Sensor Voltage and
Threshold Adjustment for 1
st
drum master sensor).
3. The sensor input voltage is displayed on the operation panel. Turn VR3 [A] on
the I/O board until the value is between 1.0 and 1.2 volts.
4. Set SP2-006-8 (Make master without printing) to ‘On’. Then press the “Start”
key while holding down the “.” Key. This wraps a blank master around the drum.
5. Access SP6-004-5 (Sensor Voltage and Threshold Adjustment for 1
st
drum
master sensor).
6. The sensor input voltage is displayed on the operation panel. Check if it is 3.0
volts or more.
C262R026.WMF
[A]