DOWNLOAD Panasonic KX-FC253UA-T / KX-FC258RU-T Service Manual ↓ Size: 9.28 MB | Pages: 127 in PDF or view online for FREE

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The scanning block of this device consists of a control circuit and a contact image sensor made up of a celfoc lens array, an LED
array, and photoelectric conversion elements.

When an original document is inserted and the start button pressed, pin 138 of IC10 goes to a low level and Q20 are turned ON, pin
34 of IC10 goes to a high level and the transistor Q21 turns on.This applies voltage to the LED array to light it. The contact image
sensor is driven by each of the FTG-F1 signals output from IC10, and the original image illuminated by the LED array undergoes
photoelectric conversion to output an analog image signal (SIG). The analog image signal is input to the system ASIC on AIN1 (pin
3 of IC10) and converted into 8-bit data by the A/D converter inside IC10. Then this signal undergoes digital processing in order to
obtain a high-quality image.

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1. Function

One individual stepping motor is used for transmission and reception. It feeds the document or recording paper synchronized
for reading or printing.

2. Circuit Operation

During motor driving, pin 124 of ASIC IC10 becomes a high level, and Q403, Q402 turns ON. As a result, +24V is supplied to
the motor coil. 
Stepping pulses are output from ASIC IC10 pins, 120~123, causing driver IC401 pins, 11~14 to drive the Motor Coil. The
motor coil is energized sequentially in 2 phase increments, which causes a 1-step rotation. A 1-step rotation feeds 0.13 mm of
recording paper. 
The timing chart is below.

Function

Mode

Phase Pattern

Speed

Copy

Fine, Photo

1-2

432 pps (t=1/432)

Super Fine

1-2

216 pps (t=1/216)

FAX Sending

Standard

2-2

432 pps (t=1/432)

Fine, Photo

1-2

432 pps (t=1/432)

Super Fine

1-2

216 pps (t=1/216)

FAX Receiving

Standard, Fine, Photo

1-2

432 pps (t=1/432)

Super Fine

1-2

216 pps (t=1/216)

Paper Feed

———

1-2

432 pps (t=1/432)

Document Feed

———

1-2

432 pps (t=1/432)

Stand-by

———

All phases are currently off.

None

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When the motor suspends while it is in the receive mode (about 70~80 msec), pin 124 of ASIC IC10 becomes a low level and
Q403 turns OFF. Then Q402 also turns OFF, and instead of +24 V, +6 V is supplied through D401 so that the motor is held in
place. When the system is in the stand-by mode, all of the motor drive transistors turn OFF. Consequently, the motor current
stops.

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All of the sensor and switches are shown below.

See Test Mode (P.63). (#815: Sensor Check) 
(*1) Refer to Translation Lists (P.11) for Error Message.

Sensor Circuit Location

Sensor

Sensor or Switch Name

Error Message (*1)

Operation Panel

SW351

Document top sensor

[REMOVE DOCUMENT]

SW352

Document set sensor

[CHECK DOCUMENT]

Sensor P.C.Board

SW1001

Cover Open sensor 
Paper Top sensor

[CHECK COVER]
[PAPER JAMMED]

SW1002

Film Detection sensor

[FILM EMPTY]

Film End Sensor P.C.Board

SW1003

Film End sensor

[CHECK FILM]

Gear Block

SW1004

Motor Position sensor

[CALL SERVICE2]

Hook Switch P.C.Board

SW1501

Hook switch

————