Sharp AR-BC260, Service Manual

Page: 53 / 308

AR-BC260 DESCRIPTIONS OF EACH SECTION 7 - 16
(3) Major parts/signals functions and operations
RW: Abbreviation of Related Wiring, which means the said load is specified in the related figure of the mechanical and the electrical sec-
tions.
(4) Operational descriptions
a. Drum cartridge and toner cartridge drive
The drive power for the drum cartridges are transmitted from the
drive motor (DM) to the drum gears.
The toner cartridge is driven through the drum gear and the con-
nection gear.
The motor (stepping motor) for black is driven by the drive signal
sent directly from the PCU, and the motors color are driven by the
drive signals sent from the PCU through the driver PWB.
b. LED (writing) unit
Four LED (writing) units are provided for each of Yellow, Magenta,
Cyan, and Black.
Each LED (writing) unit converts YMCK dot image data outputted
from the ICU PWB into LED light, and radiate the light onto the
OPC drum, forming electrostatic latent images on the OPC drum.
Since the position of each LED unit of CMYK is shifted in the
paper transport direction, the above operation depends on the rel-
ative position and differs in the operating timing.
2
5
4
4
7
1
8
9
3
6
5
11
10
No. Name Code, Signal name Function
1 OPC drum (YMCK) — Forms electrostatic latent images.
2 Main charger (YMCK) MC Charges the OPC drum surface negatively.
3 Discharge lens — Discharges the OPC drum surface.
4 Cleaning blade — Cleans the OPC drum surface to remove residual toner.
5 Toner reception seal — Seals to prevent against toner leakage.
6 Waste toner transport screw — Transports toner scraped by the cleaning blade to the waste toner box of the
toner cartridge.
7 MC cleaner — Cleans the MC (charging plate).
8 LED unit — Converts image signals into LED light and radiates it onto the OPC drum.
9 Developing roller — Attaches toner to the OPC drum. (Do not touch the developing roller.)
10 DV CRUM (Y, M, C, K) — Memory for toner cartridge data (counter, etc.)
11 Waste toner box — Collects waste toner transported from the drum cartridge.
RW Grid biks GB Controls the drum surface potential.
RW Discharge lamp DL Radiates lights onto the discharge lens.
RW Drum motor A, A’, B, B’ DM A, A’, B, B’ Drives the OPC drum.
RW Toner empty sensor TES Detects the toner quantity in the toner cartridge.