Olivetti DR N17, Service Manual, Page: 161 / 558

687200Q Service Manual 5-49
5.2.1.20 HVPS (Charge Roll AC) Operation
This diagnostic tests HVPS AC voltage to the Bias Charge Roll.
WARNING! This test switches on the HVPS. Never touch the parts supplied with a high voltage
from the HVPS when running the following diagnostics. The HVPS output voltages
switched on by these procedures can be measured by means of a multimeter. Be
sure to observe the following procedures to check the voltages.
Execute HVPS (Charge Roll AC) Operation:
1 Enter Diagnostics Mode 1. The LCD displays PRINT COUNTER OPERATION indicating the
printer is in Diagnostics Mode 1.
2 Press the MENU UP (1) or MENU DOWN (5) key until the LCD displays HVPS (C. ROLL AC)
OPERATION message.
3 Remove the EP Cartridge from the printer.
4 Bypass the Front Cover interlock switch and the EP Cartridge interlock switch with an Interlock
Bypass key or equivalent.
5 Set the multimeter to read a momentary AC voltage (approximately one second in duration) in
the 1k VAC range.
6 Using alligator clips, connect the multimeter to the following terminals:
• Positive test probe to the rear pin of the two voltage supply pins on the right side of the
Transfer Chute Assembly (see Figure 5.2.1.20.1).
• Negative test probe to the LVPS frame or the printer frame.