Sharp AR-651 (serv.man23) Service Manual ▷ View online
AR-651/810 CONTROL PANEL 5 - 10
LDON0
"L"
"L" 17
D7
Q3
IC8(7932)
R3
(COPY)
5VL
LED4
G
5. 4. 2. LED display circuit
(1) Method of LED display
ex) Displaying “COPY”
The transistor is turned ON when the LDON 0 signal becomes “L” level.
Also, when IC8-17pin (D7) changes to “L”, the current flows from 5VL via the transistor to LED4 (“COPY”)
to turn ON LED4 (“COPY”).
Current
Conditions to turn ON the LED
(a) The transistor (Q3) connected to the LED anode is ON.
(b) The output from the cathode side of the LED is “L” level.
The LED is turned ON when (a) and (b) are satisfied.
AR-651/810 CONTROL PANEL 5 - 11
5. 5. Disassembly and Replacement
[A] Control panel unit
(1) Open the front cover and take off the front side
right inner cover, toner cartridge drive unit and
toner recycle unit.
(2) Remove 2 screws and take off the control panel
bottom cover.
(3) Disconnect 3 connectors, remove 2 screws,
release harnesses from 2 clamps and take off
the control panel unit.
Control panel bottom cover
Connector
Clamp
Connector
Connector
Connector
Connector
DSP board
(4) Remove 10 screws, disconnect 2 connectors
and release the bracket after disconnecting 1
connector at the counter.
(5) Disconnect 7 connectors, remove 6 screws and
take off the DSP board.
AR-651/810 CONTROL PANEL 5 - 12
(6) Remove 9 screws and take off the MKEY board.
(7) Remove 8 screws and take off the SKEY board.
(8) Remove 4 screws and take off the LCD panel.
MKEY board
SKEY board
LCD panel
AR-651/810 SCANNING SECTION 6 - 1
Exposure lamp
Carriage-1
Drive pulley
6. SCANNING SECTION
6. 1. Function
In the scanning section of this copier, the surface of an original is irradiated with a direct light and the
reflected light is led through mirrors and lens to the CCD where the optical-to-electrical conversion is
performed, converting the optical image data into an electrical signal. This analog signal is changed to a
digital signal, and then undertakes various corrective processes necessary for image formation. After that,
an arithmetic operation is performed on the digital signal, which is then sent to the data writing section.
Rail for carriage-1
Original glass
Reflector
Shading correction
plate
plate
Carriage-2
Rail for carriage-2
Lens
CCD sensor
CCD board
SLG board
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