Minolta Di551 Service Manual page 445

1. Points to be confirmed before mainte-
nance
Before starting maintenance, ask a
user and collect information about trou-
bles that occurred on the machine
before the maintenance and the condi-
tions of the machine to grasp key points
for the maintenance.
2. Copy sample
Be sure to make copy samples at the
start and the end of maintenance for
checking images.
3. Drum
a) Never expose the drum to the sunlight.
Be also careful not to expose a drum to
indoor light as far as possible.
When a drum unit or a drum is out of the
machine, never fail to cover it with a
drum cover.
b) When replacing a drum, toner guide
roller or cleaning blade, refer to the Item
removing and installing a cleaning
blade.
Main Precautions for Maintenance
4. When replacing the drum and devel-
oper, must perform neccessary adjust-
ment by refering to the List of
Adjustment Items.
5. After having completed maintenance
work, must reset the PM counter (using
the 25 mode).
6. When replacing the fixing unit cleaning
web, developer, and drum must reset
the fixing unit cleaning web counter(
using the 36 mode).
7. When replacing a toner cartridge, wait
until the toner supply LED on the oper-
ation panel flashes before the replace-
ment.
Caution:Turn the main power switch
(SW1) off and pull out the power
pulg without fail before the
work of maintenance.