Sharp AR-810 (serv.man20) Service Manual ▷ View online
AR-651/810 RADF (DOCUMENT FEEDER) 16 - 37
16. 7. Errors
Errors can be divided into the sensor adjustment error, EEPROM error and tray lift motor error.
(1) Sensor adjustment error
There are 4 kinds of sensor adjustment errors:
1) Original length sensor adjustment error
2) Read sensor adjustment error
3) Large original exit sensor adjustment error
4) Small original reverse sensor adjustment error
The D/A output voltage is adjusted so that the A/D input voltage for each sensor is kept within the
range between 3.16V~3.55V while carrying out the EEPROM initialization and all-sensor adjustment
at the adjustment mode. At this time, the sensor adjustment error occurs when the D/A output
voltage cannot be adjusted within the range between 0.04V~2.90V.
(2) EEPROM error
The EEPROM error occurs when the initialization value cannot be written on the EEPROM while
carrying out the EEPROM initialization and all-sensor adjustment at the adjustment mode or when
data cannot be read out from the EEPROM after turning ON the power.
(3) Tray lift motor error
The tray lift motor error occurs when a feeding jam because of which the upper limit/lower limit
cannot be detected within a specified time while lifting/lowering the tray takes place 3 times
continuously.
AR-651/810 RADF (DOCUMENT FEEDER) 16 - 38
16. 8. Original Size Detection
The original position base code is transmitted to the copier during the time after the feed signal is sent
until 1st original passes through the original width sensor. The original size is detected whenever feeding
an original and transmitted to the copier as a code before scanning starts.
16. 8. 1. Original size detection method
(1) Original position base code
The tray guide width is measured and stored when the feed signal is received. Altering of the tray
guide position during the operation is ignored.
(2) Width direction size
The status of the original width sensor 1~3 are stored when the leading edge of an original reaches
the position 10mm further from the 1st roller after feeding has started with the original at the
pre-feeding position.
(3) Feeding direction size
When the leading edge of an original reaches the position 7mm further from the read sensor, the
original size is decided by considering the information whether or not the original length sensor is
ON, original position base code and status of the original width sensor 1~3. Then it is transmitted to
the copier. However, when the original length sensor is ON at the mixed-original mode, the original
size for some combinations cannot be decided. In this case, the size is decided by taking into
consideration the feed motor pulses counted during the time after the original is idle reversed until it
passes through the original length sensor and transmitted to the copier.
AR-651/810 RADF (DOCUMENT FEEDER) 16 - 39
16. 8. 2. Original size detection chart
Not over
160mm?
160mm?
NO
YES
Tray guide
width
detected
receiving
ORG-IN
(mm)
~114
~165
width
detected
receiving
ORG-IN
(mm)
~114
~165
~196
~234
~268
268~
~114
114~
114~
Tray guide
width
decided
receiving
ORG-IN
(mm)
width
decided
receiving
ORG-IN
(mm)
79
148
182
210
257
279
79
148
Original
length
sensor at
scanning
standby
position
length
sensor at
scanning
standby
position
OFF
ON
OFF
ON
ON
OFF
ON
OFF
ON
ON
OFF
ON
ON
OFF
ON
Size 2
(width
268.4 mm
or over)
(width
268.4 mm
or over)
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
OFF
ON
ON
Size 1
(Width
196.0 mm
or over)
(Width
196.0 mm
or over)
OFF
ON
ON
OFF
ON
ON
OFF
ON
OFF
ON
ON
OFF
ON
Mixed
originals
mode?
originals
mode?
NO
YES
NO
YES
Tray
sensor
receiving
ORG-IN
sensor
receiving
ORG-IN
OFF
ON
ON
OFF
ON
ON
Switch
back
pro-
hibited?
NO
YES
NO
YES
Reversal
without
reading
length
detected
(mm)
without
reading
length
detected
(mm)
~314
~357
357~
~357
357~
~277
~314
~357
357~
~314
~357
357~
~314
~357
357~
~357
357~
Reversal
without
reading
length
decided
(mm)
without
reading
length
decided
(mm)
297
330
384
330
384
257
297
330
384
297
330
384
297
330
384
330
384
Size
(288.2 mm
or over)
(288.2 mm
or over)
OFF
ON
ON
OFF
ON
ON
Size
decided
A5-R
A5-R
B5-R
A5-R
B5-R
B5-R
A5-R
B5-R
A5-R
B5-R
B5-R
A4
B5-R
A4-R
A4-R
FOLIO
A4-R
FOLIO
A3
A4-R
B5
B5-R
A4-R
A4-R
FOLIO
A3
B4
B4
B5
B5
LT
A4
B4
B4
B5
B5
LT
A4
A4-R
FOLIO
A4-R
FOLIO
A3
A4-R
B4
LD
A3
A5-R
A4-R
A4-R
A4 series
AR-651/810 RADF (DOCUMENT FEEDER) 16 - 40
Not over
160mm?
160mm?
NO
YES
Tray guide
width
detected
receiving
ORG-IN
(mm)
~110
~178
width
detected
receiving
ORG-IN
(mm)
~110
~178
~237
~268
268~
~110
110~
110~
Tray guide
width
decided
receiving
ORG-IN
(mm)
width
decided
receiving
ORG-IN
(mm)
79
140
216
257
279
79
140
Original
length
sensor at
scanning
standby
position
length
sensor at
scanning
standby
position
OFF
ON
OFF
ON
ON
OFF
ON
OFF
ON
OFF
ON
Size 2
(Width
268.4mm
or over)
(Width
268.4mm
or over)
OFF
ON
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
OFF
ON
ON
Size 1
(Width
196.0 mm
or over)
(Width
196.0 mm
or over)
OFF
ON
ON
OFF
ON
ON
OFF
ON
OFF
ON
ON
OFF
ON
Mixed
originals
mode?
originals
mode?
NO
YES
NO
YES
NO
YES
Tray
sensor
receiving
ORG-IN
sensor
receiving
ORG-IN
OFF
ON
ON
OFF
ON
ON
OFF
ON
ON
Switch
back
pro-
hibited?
Reversal
without
reading
length
detected
(mm)
without
reading
length
detected
(mm)
~305
~343
~394
394~
~343
~394
394~
~305
~343
~394
394~
~343
~394
394~
~305
~343
~394
394~
~343
~394
394~
Reversal
without
reading
length
decided
(mm)
without
reading
length
decided
(mm)
279
330
356
432
330
356
432
279
330
356
432
330
356
432
279
330
356
432
330
356
432
Size
(Width
288.2 mm
or over)
(Width
288.2 mm
or over)
OFF
ON
ON
OFF
ON
ON
Size
decided
ST-R
ST-R
ST-R
LD
8.5”x8.5”
LT-R
LT-R
LT-R
LG
LT-R
13”LG
LG
LD
LD
8.5”x8.5”
8.5”x8.5”
8.5”x8.5”
LT
LT-R
LG
LT-R
13”LG
LG
LD
LD
COMP
COMP
COMP
8.5”x8.5”
LT
LT
A4
LT
A4
LT-R
LG
LT-R
13”LG
LG
LD
LD
COMP
LD
A3
ST-R
LT-R
LT-R
LT series
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