Spf Section <Al-1622 Only> - Sharp AL-1611 Service Manual

3) The self-check function comes active when one of the following
malfunctions occurs, and an "H" is displayed on the copy quantity
display.
Fusing temperature error value
H4 (Low temperature error)
• During machine operation
The case where the fusing temperature (thermistor output value)
does not reach 155°C within 55 sec from lighting of the heater
lamp. (If the toner motor rotates for 10 sec or more continuously
when starting the machine, the case where the fusing tempera-
ture does not reach 155°C within 60 sec.)
• During printing
When the fusing temperature (thermistor output value) falls below
145°C.
H3 (High temperature error)
Fusing temperature (thermistor output value) of about 220 to 240°C
(varies depending on the resistance.)
E. Fusing resistor
(1) Fusing resistor
Since the upper heat roller is conductive when copy paper is highly
moistured and the distance between the transfer unit and the fusing unit
is short, the transfer current leaks through the copy paper, the upper
heat roller and the discharging brush.
To prevent against this, a resistor of 150MOhm is provided between the
frame and the discharge brush to minimize leak current and improve
transfer efficiency.
7. SPF SECTION <AL-1622 ONLY>
A. Brief descriptions of operations
1) Document set (Document set sensor ON)
2) Document size detection (The document width is detected
with document width sensors W1, W2, and W3, and the
document length is detected with document length sensors
L1 and L2.)
3) Copy start (Machine)
4) SPF motor ON
5) Pickup solenoid ON
6) Pickup roller rotation
7) Paper feed roller rotation
8) Paper entry sensor detects paper presence.
9) PS roller rotation
10) Copy operation (Machine)
11) Transport roller rotation
12) Paper exit roller rotation
13) Document exit
YES
14) Next document
NO
15) SPF motor OFF
B. Document size detection
Document size detection by document set tray
When a document is set on the document set tray in the auto mode of
paper/copy magnification ratio selection, the document size is detected
to perform the auto selection function of paper and the copy magnifica-
tion ratio according to the detected document size.
When documents of different sizes are mixed and set on the tray, the
max. size is detected. The document width is detected by the document
width sensors (W1, W2, W3), and the document length is detected by
the document length sensors (L1, L2) to determine the document size.
The document size judgment is made after a certain time from when the
document set sensor (W0) detects the document.
AB series
Inch series 8.5" x 5.5"
Note: Sensor ON:
AL-1611/AL-1622 OPERATIONAL DESCRIPTIONS
6 – 8
L2 L1
W0
W1
W2
W3
Document width sen-
Document size
sor
and set direction
W1 W2
A5
B5
A5R
A4
B5R
A4R
8.5" x 13"
B4
A3
8.5" x 5.5"R
11" x 8.5"
11" x 8.5"R
8.5" x 13"
8.5" x 14"
11" x 17"
OFF:
D o c u m e n t
length sensor
W3 L1 L2