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5V 0V
R304 NC

TO LCD TO DIGITAL
CN301 RESET KSCLK KTXD KRXD KLATCH KSTART +5V GND
8 7 6 5 4 3 2 1

3.3V or 5V 0V
R341 R300 R301 R302 R303 R342 +5V 1n 3.3k 68 180 270 180 180 100p 100p 330p 330p R343 1k

R305 NC 10 R306 NC R307 NC 9 8 7 6 R308 NC R309 NC R316 180 5 4 3 2 1

CN302 D3 D2 D1 D0 E R/W RS V0 +5VLCD GND

C303

C304

C305

C341

C306

C300 100n

RH1

AP1

+5V R313 NC R315 4.7 R310 18k R311 1.2k R312 C311 R314 C310 820 100n 100n +5V R322 NC NC R321 330 NC +5V +5V R332 NC 2.2k

LCD CONTRAST

C301

C302

NC

100u

33

32

31

30

29

28

27

26

25

24

TXD RXD SCLK RESET D7/DIO/IP D6/CLK/IP D5/CSB/IP D4/STBB/IP E/RESB RWB/RWB/IP RS/A0/IP

23

+5V
22 21 19 18 17 16 15 14 13 12

+5V
34 35 36

5V 0V

100n

37 38 39 40 41 42 43 44

ERASE
1 2 1 2 1 2 1

1
2 1

2
2 1

3
2

REDIAL/PAUSE
1 2

CALLER ID
1 2

SW301

SW306

SW311

SW315

SW319

SW323

SW327

SW331

LOCATOR/INTERCOM
1 2

MEMO
1 2 1 2 1

4
2 1

5
2 1

6
2

FLASH/CALLWAI T 1 2

STOP
1 2

KSL2 LED6 KIN1 LED7/KSL4 XLED8 XLED9 KIN2 KIN3 XLED10 KSL3 KIN4

LATCH START LED2 LED3 LED4 VSS2 VDD2 LED5 KIN0 KSL0 KSL1

IC301

LED1/IPENB XLED15 XLED14 XLED13 VSS1 VDD1 XLED11 XLED12 KIN7 KIN6 KIN5

C308

100n

20

C307

+5V

RED
LED302
2 1

10

11

1

2

3

4

5

6

7

8

9

SW302

SW307

SW312

SW316

SW320

SW324

SW328

SW332

CHARGE

HELP
1 2

CHECK
1 2 1

SET
2 1

7
2 1

8
2 1

9
2

MUTE
1 2

COPY
1 2

0V: LED ON 5V: LED OFF
R320

SW303

SW308

SW313

SW317

SW321

SW325

SW329

SW333

MENU
1 2 1

REC
2 1 2 1 2 1

0
2 1

#
2

SP-PHONE
1 2

FAX/START
1 2

330

2

1

RED LED301 AUTO ANSWER

SW304

SW309

SW314

SW318

SW322

SW326

SW330

SW334

AUTO ANSWER 1 2

PLAYBACK
1 2

0V: SW ON 5V: SW OFF
+5V

SW305

SW310

R330

4.7k

4.7k

R331 MIC(+)1
1

MIC C330 10n
2

100

4 3

1 2 C331

R333 100 10n

4 3

NC

1 2

SW351 Document top SW

SW352 Document set SW

TO DIGITAL
MIC(-)1

NC

KX-FP218FX-S : Operation Board