Sharp Electronics (UK) Ltd., Document Systems Support
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PHOTO SENSOR TROUBLE
Please read notes highlighted in RED
1. Model Name:
MFP Main unit
MX-1810U/2010U/2010UX, MX-RP12, MX-2310U/3111U, MX-2614N/3114N
MX-2615N/3115N, MX-2610N/3110N/3610N, MX-2640N/3140N/3640N, MX-2314N
MX-4110N/4111N/4112N/5110N/5111N/5112N, MX-M283N/M363N/M453N/ M503N/
MX-DE12/DE13/DE14/ DE20, MX-DE15/DE16, MX-DEX8/DEX9
Due to the reduction of the light amount from the photo sensor used for Paper Feed/Transport
system and Drum phase detection, the following troubles have been observed
(1) Paper Jam in the area around the paper feed section of the cassette ~ Transport section of
Desk/Main unit until PPD1, and also in Document Feeder)
(2) “Close the right side cover.” message is not displayed.
(3) “Add paper” message does not disappear or the paper cannot be lifted.
(4) Drum phase sensor trouble “F2-50~53” occurs.
The light reduction at the photo sensor is attributed to a resin change during the production of the
wafer of the LED chip. The characteristic of the light being received by the wafer is uneven and is
out of specification. On the following two types of photo sensors in the list below, the resin which is
used in molding the element (chip) was changed in the middle of production, and the defective
chips were mixed with non-defective chips. The defective chips have a smaller opening in which
light passes through and caused a reduction of light being received on the wafer of the sensors.
The old style 1A and 1S type sensors have no markings on them and it is impossible to distinguish
the good sensors from the defective ones.
Section to be used
(New part number-
Used for the original
*Used with 10mA as the initial value of IF (forward
current) and it is possible to use with up to 1mA
*Weak against Hot Swap, static electricity,
Used for Drum phase
detection system, and
also the original
system. Section to be
used varies depending
on the model.
*Used with 20mA as the initial value of IF (forward
current) and it is possible to use with up to 0.4mA
*Strong against Hot Swap, static electricity,
*Based on above, 1S type sensor has more margin
than 1A type sensor, which takes longer time to