Hvps (Developer Bias Ac) Operation - Olivetti DR N17 Service Manual

5.2.1.23 HVPS (Developer Bias AC) Operation

This diagnostic tests HVPS AC voltage to the Developer 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 (Developer Bias 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 (DEV BIA 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 voltage (approximately one second in duration) in the
2500 VAC range.
6 Using alligator clips, connect the multimeter to the following terminals:
• Positive test probe to the front 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.
7 Press the ENTER key to execute the test. The LCD displays the HVPS (DEV.BIA AC) message.
HVPS (DEV.BIA AC)
Operation EXECED
NOTE: Voltage is present for approximately one second each time ENTER is pressed.
8 The normal momentary HVPS Developer Bias output voltage is approximately 2.0 KVAC.
9 If you wish to exit this test and enter another test use the MENU UP (1) or MENU DOWN (5) key
to scroll to another test.
10 To exit this test and return to normal operation, switch OFF the printer power then switch it ON.
687200Q Service Manual 5-53