SEMICONDUCTOR DATA

Microprocessor : 75308BGK740BE9 (LCD Assy IC2)

Terminal connection diagram

 

o m m t - w m * m m - o m m t - w m

~ m ~ -

 

 

w m m m m m m m m m m * * * * * * * * *

 

 

P61

61

 

 

 

40

PO2

62

 

 

 

39

PO1

P62

 

 

 

63

 

 

 

38

PO0

P63

 

 

 

64

 

 

 

37

P53

P70

 

 

 

65

 

 

 

36

P52

P71

 

 

 

66

 

 

 

35

P51

P72

 

 

 

67

 

 

 

34

P50

P73

 

 

 

68

 

 

 

33

Vss

RESET

 

 

 

69

 

 

 

32

P43

S0

 

 

 

70

 

 

 

3 1

P42

S1

 

 

 

7 1

 

 

 

30

P41

S2

 

 

 

72

 

 

 

29

P40

S3

 

 

 

73

 

 

 

28

VLCP

S 4

 

 

 

74

 

 

 

27

V L C ~

S5

 

 

 

75

 

 

 

26

VLCO

S6

 

 

 

76

 

 

 

25

BIAS

S7

 

 

 

77

 

 

 

24

COM3

S8

 

 

 

 

 

 

 

23

COM2

S9

 

 

 

 

 

 

 

 

22

COM I

S10

 

 

 

 

80

 

 

 

21

COMO

S l I

 

 

 

 

-

N m *

m w t - ~ ~ O

 

 

- N m ~ m w t - m m z -

 

 

 

- - - - - -

 

m

 

Terminal function

Pin No.

Pin Name

1-20

S12-S31

21 -24 COMO-COM3

25

BIAS

26-28 VLCO-VLCZ

29-32 P40-P43

33

Vss

34-37 P50-P53

--

38PO0

39-41 PO1-PO3

42P I 0

43P I 1

4 5 4 5

P12, P I 3

46P20

47P21

4 8 P22

49P23

50P30 - '

51P31

I10Function

0 LCD output (S20-SII.

0LCD COMO-COM3 output

0LCD power supply voltage. - LCD voltage level generator.

-Open (not use).

-GND.

-Open (not use).

IHOOK (PC) ser~aldata input.

-Open (not use).

ISer~aldata input.

I PTT (PC) serial data input.

-Open (not use).

0Beep output (HI).

0~ e i output (Med).

0Beep output (Lo).

-Open (not use).

0PTT (PC) serial data output.

0HOOK (PC) serial data output.

Pin No.

Pin Name

I10

Function

52

P32

-

Open (not use).

53/ P33--0 Serial data output.

54

I

VDD

-

 

+5V.

 

 

 

 

55

1

XT1

-

 

+5V.

 

 

 

 

56

 

XT2

-

1

Open (not use).

 

57

 

NC

-

Open (not use).

 

58, 59

 

XI, X2

-

1

System clock input.

 

60

 

P60

I

I

AUX swltch input.

 

61

 

P61

1 I

SCAN swltch ~npui .

 

62

-P62

-I

Volume up switch input.

 

63

 

P63

I

 

Volurne down switch input.

,

64

 

P70

I

 

Group up swltch input.

 

65

 

P71

I

 

Group down switch input.

 

66

 

P72

I

 

System up switch input.

 

-1'467-

 

P73

I

 

System down swl 'h input.

 

: '68

 

RESET

I

 

System reset ~nput.

 

69-80

 

1

0

 

LCD output (532-S21).

 

Page 37
Image 37
Kenwood TK-940 service manual Microprocessor 75308BGK740BE9 LCD Assy IC2

TK-940 specifications

The Kenwood TK-940 is a highly regarded mobile two-way radio that has earned a reputation for its ruggedness, reliability, and excellent communication capabilities. Designed for professionals in various sectors such as public safety, transportation, and construction, the TK-940 incorporates advanced technologies to meet the demanding needs of users in the field.

One of the standout features of the TK-940 is its robust design, which complies with military specifications for durability. Its construction allows it to withstand harsh environmental conditions, making it suitable for outdoor and challenging work environments. The radio is also equipped with a water-resistant casing, ensuring that it can function reliably even in wet conditions.

The TK-940 operates in the VHF frequency range, providing wide coverage and strong signal penetration. With a power output of up to 110 watts, users can achieve long-range communication, essential for coordinating activities over large areas. The radio supports both analog and digital modes, allowing seamless integration into various communication systems while maintaining high audio clarity.

Another significant feature of the TK-940 is its enhanced audio quality. The radio is equipped with Kenwood's advanced noise cancellation technology, which minimizes background noise and ensures clear voice communication even in noisy environments. The audio output is powerful and adjustable, catering to individual user preferences.

Moreover, the TK-940 supports a variety of signaling options, includingDTMF, MDC-1200, and 2-Tone/5-Tone signaling, facilitating efficient communication. These signaling features enhance interoperability with other communication devices and systems, allowing users to communicate seamlessly with teams or dispatch centers.

Kenwood has also incorporated user-friendly functionalities into the TK-940. It boasts an intuitive user interface with programmable buttons, enabling quick access to essential features. The large, backlit display provides clear visibility and is easy to read in various lighting conditions.

The TK-940 is designed with safety in mind, featuring emergency alerts and lone worker protection, ensuring users can communicate their status in critical situations. Overall, the Kenwood TK-940 is a powerful and versatile mobile radio that combines durability, advanced technology, and user-friendly features, making it an ideal choice for professionals who require reliable communication in the field.