Ricoh A151 Field Service Manual page 334

REPLACEMENT AND ADJUSTMENT
18.5 DEVELOPMENT BIAS VOLTAGE ADJUSTMENT (SP9-38)
[A]
ADJUSTMENT STANDARD
DC –500 ± 10 V
NOTE: VRB on the CC/Grid/Bias power pack spare parts is pre-adjusted.
Usually it is not necessary to adjust VRB when the CC/Grid/Bias
power pack is replaced.
1. Set the multimeter range to dc 1,500 V and connect the multimeter leads
as shown.
NOTE: Keep the multimeter leads away from the main board.
2. Turn on the main switch, close the front cover safety switch, then turn on
the development bias using SP9-38.
3. Adjust the development bias voltage to –500 ± 10 V by turning VRB on

the CC/Grid/Bias power pack [A].
4. Press the
A202/A203
key and turn off the main switch.
Adjusting VR
VRB
8-56
A203R504.img
SP Mode
SP9-38
SM