SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS

1

2

3

SYS

(PHON)

(STR)

(HOME)

(RCL)

DS2

 

 

DS4

4

5

6

 

 

GRP

 

 

(CLR)

7

8

9

(S.A/D)

 

DS3

 

DS1

 

SCAN

*

0

#

(SND)

(

)

 

10-KEY BOARD FRONT VIEW

HC5

GND

KEYS0

KEYS1

KEYS2

KEYS3 KEYR0

KEYR1

KEYR2

 

 

 

 

 

 

 

HC6

20

 

 

 

 

 

 

 

 

 

 

 

 

 

HC7

 

 

 

 

 

 

 

HC8

 

 

 

 

J1

 

 

19

HC11

SPE

 

GND

GND

L5V

BKLED

GND

GND

HC12

SP

KEYR3

GND

HC4

HC3

HC1

 

 

2

 

 

 

 

 

 

R5

R4

R2

C5

 

1

R3

R12

Q1

 

 

 

 

 

 

MICE

MIC

HC2

R11

R10

 

HC9

 

 

 

 

HC10

C4

C2

C3

R1

C1

SPEAKER

MICROPHONE

10-KEY BOARD BACK VIEW

November 1999

 

Part No. 001-7780-500

8-10

Page 110
Image 110
EFJohnson 7780 service manual KEY Board Front View, KEY Board Back View