Automatic Detection Of Original Paper Size; Adjusting Quantity Of Light Of Ae Sensor - Panasonic FP-7818 Service Manual & Parts Manual

(6) Automatic detection of original paper size

• Opening the platen cover by approx. 30 degrees to insert the original, the
platen cover angle sensor turns on and four original size detection sensors
operate simultaneously.
• The original size detection sensors consists of light emission unit and light
reception unit. The light from the light emission unit is thrown on the original
and the reflected light is received by the light reception unit to check the existence
of the original.
• The original size is read again by turning on the platen open/close detecting
sensor when closing the platen cover.
• The automatic original size detecting operation is released when pressing
"original size selector" key in the control panel, setting the original in ADF or
selecting "0" for F5-52.
( Original size detection matrix )
Original size Original size
detect sensor(1) Detect sensor (2) detect semsor (3) detect semsor (4)
AOS1 AOS2
Ledger/A3
Legal/B4
Letter/A4
Letter-R/A4R
Invoice/A5
No original

(7) Adjusting quantity of light of AE sensor

• In pre-scan, the output of the AE sensor must be at a proper level. Therefore,
when operating image density control (Quantam
lamp voltage is adjusted to be approx. 2.7V of AE sensor output when reading
the standard density mark, and the system memorizes the compensation value
at that time.
• In pre-scan automatic exposure mode, the original reflects the light of the
exposure lamp voltage adding the above compensation value, and the original
density is read by the AE sensor. The result corrects the exposure before
copying.
Reference: Service mode for adjustment (for details refer to the "Field Service Manual")
F6-01: Compensation of vertical copy ratio (compensating scanning speed of
optics unit)
F6-02: Compensation of full size focus
F6-03: Compensation of horizontal copy ratio (compensating lens position)
F6-05: Compensation of paper registration position (Compensating timing roller
clutch turning on timing)
F6-11: Compensation of quantity of exposure light for full size
F6-12: Compensation of quantity of exposure light for photo mode
F6-16: Compensation of quantity of light for AE sensor
–
Detect
–
No detect
Original size Original size
AOS1
AOS3 AOS4
AOS3
TM
Technology), the exposure
AOS4
AOS2
3-7