Ricoh PRIPORT VT 2000 Series Service Manual page 232

3.1.8 White Level Adjustment
Purpose: To set the white level so that the background of the test chart is not
copied.
1. Position the test chart so that the background area (white area) of the test
chart can be read.
2. Press the Print Start key to turn on the fluorescent lamp.
3. Adjust VR 600 for VT2100/VT2130/VT2150 (VR-1 for VT2300/VT2500)
on the A/D conversion PCB so that the maximum level is 2.0 ± 0.1 V.
A: 2.0 ± 0.1V
5-19
28 February '91
A