AR-LC1 (serv.man2). ARLC1 Service Manual - Sharp Copying Equipment Service Manual (repair manual). Page 23

On the communication buffer circuit, signals are input and output by the transistor array TD62504 (IC02).

The sensor signals used by LCC are connected directly to the input port of the IC02. LPFD is provided with a static electricity noise protective diode
which protects against static electricity from the paper transport section. The other sensors has the same circuit configuration as the LPED.

A limit switch is provided to protect the LCC If it fails to operate normally. If the tray exceeds the upper limit sensor (LUD) position, the switch is
turned on to shut off the power of the lift motor.

2

P51/RXD

6

P46/CLK

1

P50/TXD

3

P52/SCK

3

14

2

15

12

5

10

7

CPU(IC01)

4.7K x 2

4.7K x 4

IC02C

IC02B

IC02E

IC02G

TD62504F

TD62504F

TD62504F

TD62504F

1SS133 x 4

D04

D05

D09

D10

D01

D02

D07

D08

1SS133 x 4

+5V

TXD-LCC

DTR-LCC/

RXD-LCC/

DSR-LCC/

CN-B-1

CN-B-3

CN-B2

CN-B-4

+5V

D23

1SS133

R94
22K

R95
22K

BR04
4.7K

38 LPFD

R79

10K

P21/A9

LPFD

CN-A-17

CPU
(IC01)

37 LDD

R80

10K

P22/A10

LDD

CN-A-23

39 LPED

R78

10K

P20/A8

LPED

CN-A-12

D24

1SS133

C14

C15

C16

1000P x 3

24V

24V(LLSW)

LLM+

LLM-

Upper limit switch

Lift motor

LCC control PWB

Lift motor
drive circuit

Signal name

Logic

DSR-LCC

H: Request for communication

L: No request for communication

DTR-LCC

H: Communication allowed

L: Communication inhibited

TXD-LCC

H: Normal

L: Start bit

RXD-LCC

H: Normal

L: Start bit

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