Drum Unit; Composition; Mechanisms - Minolta Di551 Service Manual

DRUM UNIT

[1] Composition

1. Cleaning/toner recycle section
2. Charging corona unit
3. Drum
4. Developing unit
5. Separation claw SD (SD1)
6. Separation claws
7. Toner guide roller (TGR)

[2] Mechanisms

Mechanism
PCL/TSL
Auxiliary separation *1
Transport assistance *2 Ratchet wheel
The drum unit is an integral assembly consisting
of a drum, charging corona unit, developing unit,
cleaning/toner recycle unit, PCL, and separation
claws.
*1 Auxiliary separation
• To prevent paper jamming, three separation
claws are used to separate paper from the
drum forcibly. These separation claws are
pressed against the drum or detached from it
by turning ON/OFF the separation claw sole-
noid (SD1).
• To prevent a specific part of image-copied
paper from being stained and to prevent the
drum from being scratched, the swing mecha-
nism slides the separation claws about 8 mm
1
2
4
3
8
14
13
Method
LED
Separation claws
2-E-1
5
6
7
9
10
11
12
8. PCL
9. Charging corona unit
10. Drum
11. Developing unit
12. TSL
13. Transfer and separation corona unit
14. Cleaning/toner recycle section
back and forth in parallel with the drum sur-
face.
Separation claw SD (SD1)
Separation claw
*2 Transport assistance
The thick paper conveyance ability has been
improved by the use of ratchets.
DRUM UNIT