Drum Current Adjustment Preparation - Ricoh FT5540 Service Manual

8.6 Drum Current Adjustment Preparation

The drum current varies with environmental conditions such as humidity and
atmospheric pressure. The drum current should be checked and adjusted only when
the corona power pack is replaced or the copy image is out of specification. This is
because each corona unit is adjusted to a range of environments in the factory.
CAUTION: Make sure that the main switch is turned off when you change the range
on the digital multimeter; otherwise, the multimeter may be damaged.
Make sure that the main switch is turned off when you touch the drum
shoe.
1. Turn off the main switch and remove the following parts:
Drum cover
Charge corona unit
T/S corona unit cover
T/S corona unit
T/S corona paper guide
Drum stay
Pre-quenching corona unit
Cleaning unit
Development unit
Drum flange
Drum -- cover it with the protective sleeve
Drum guide [A]
Rear cover
5-65
31 August 1989