Ricoh D131 Service Manual page 599

SP2000 Drum
Vref Manual Setting
Adjusts the TD sensor reference voltage (Vref) manually.
[1 to 4/2.5/0.01 V]
Change this value after replacing the development unit with another one that
already contains toner. For example, when using a development unit from
another machine for test purposes, do the following:
2220

Check the value of SP2220 in both the machine containing the test unit
and the machine that you are going to move it to.

Install the test development unit, then input the VREF for this unit into
SP2220.

After the test, put back the old development unit, and change SP2220 back
to the original value.
2223 Vt Display
Displays the current TD sensor output voltage.
[0 to 5 / 4 / 0.02 V]
2301 Trans Current Adj
Adjusts the current applied to the transfer belt during copying.
Note: If this SP is too high, toner on the paper can go back to the drum.
1 Main Area: Image: Front Side
D131: [10 to 200/50/1
D132: [10 to 200/65/1
D133: [10 to 200/80/1
2 Main Area: Image: Back Side
D131: [10 to 200/50/1
D132: [10 to 200/65/1
D133: [10 to 200/80/1
3 By-pass Image Area: Front Side
D131/D132: [10 to 200/75/1
D133: [10 to 200/80/1
D131/D132/D133
A]
A]
A]
A]
A]
A]
A]
A]
3-24 SM Appendix