Ricoh A172 Service Manual page 491

Tech Service Bulletin No. A172/A199 – 016
Page 8 of 17
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Confirming Development Bias Voltage
CAUTION HIGH VOLTAGE ! ! ! ! Use caution when working in this area
1. Enter SP Mode Special Features, page 1.
2. Turn Process control OFF, by selecting RESET, for Process Control Self Check as illustrated below:
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3. Enter SP Mode Adjustment page 4 Setting for P-con OFF Mode.
NOTE: The original setting of BK under the VB column, then set it to -400 volts as illustrated below:
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6HWWLQJ#IRU#30FRQ#2))#0RGH
BK
#######3,'
VG
xxx
Y
xxx
M xxx
xxx
C
#&RS\#LQ#63
######5HVHW
&RS\#LQ#63
Adjust to
- 400 volts
VB
-400
xxx
xxx
xxx
########,QGH[
##3$*(
Select
reset
#######,QGH[
3$*(#7
LD
xxx
xxx
xxx
xxx
Continued...