Sharp AR-280 Service Manual page 55

AR-250/281/286/287/336/337/405/407/501/505/507
6) Clean the transfer charger wire separation lamp and install the
transfer/separation charger unit to the copier.
If necessary, wipe the lamp which can be seen from the square
hole of the TC guide rail with waste cloth.
(Do not install the main charger unit.)
7) Connect the electrode sheet and the digital multi-meter (or an
ampmeter). Manually turn on the door switch.
8) Check the drum current on the front frame side and the rear frame
side.
The current on the front and the rear frame sides: within 6.0uA
·
Turn on the main switch, and execute SIM 8-6.
(THVG will be turned ON for about 30 sec.)
·
Measure the drum current on the front frame side and the rear
frame side.
· When the microswitch is OFF, the drum current on the front
frame side is displayed.
· When the microswitch is ON, the drum current on the rear
frame side is displayed.
(OFF)
N/C
N/O COM
·
Check that the current on the front and the rear frame side is
6.0mA or less.
If the current is greater than 6.0mA, replace the charger unit
with new one.
(ON)
N/C
N/O COM
6 – 5
9) Adjust THVG output current.
·
Turn on the main switch and execute SIM 8-6.
(AR-250/280/281/285/286/335/336/405)
(AR-287/337)
(AR-407)
(AR-501/505/507)
(THVG will be turned on for about 30 sec.)
·
If the output current is not in the specified range, change the
displayed value and adjust. (1 step: about 0.1 mA)
AR-250/280/281/
Transfer charger current
285/286/287/
335/336/337
TC drum current +13.5 to
(Front surface mode) +15.0mA
TC drum current +13.5 to
(Back surface mode) +15.0mA
Adjustment spec
AR-501/
AR-405/407
505/507
+15.0 to +18.0 to
+16.5mA +19.5mA
+15.0 to +18.0 to
+16.5mA +19.5mA
7/13/2000