Panasonic KX-T7730X User manual

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distribution is a violation of law.

KX-T7730X

(for Asia, Middle Near East, Africa and Latin America)

PROPRIETARY TELEPHONE

ORDER NO. KMS0110592C3

1 INTRODUCTION 3

1.1. NOTE 3

1.2. FOR SERVICE TECHNICIANS 3

2 LOCATION OF CONTROLS 4

3 CONNECTION 5

4 DISASSEMBLY INSTRUCTIONS 6

5 IC DATA 8

6 BLOCK DIAGRAM 10

7 CIRCUIT OPERATIONS 11

7.1. KEY INPUT CONTROL CIRCUIT 11

7.2. LED CIRCUIT 12

7.3. DATA COMMUNICATION CIRCUIT 13

7.4. TONE GENERATION CIRCUIT 14

7.5. HANDSET CIRCUIT 15

7.6. SPEAKERPHONE CIRCUIT 16

8 TROUBLESHOOTING GUIDE 18

8.1. NO OPERATION 18

8.2. HANDSET TROUBLE 19

8.3. SPEAKER-PHONE TROUBLE 20

8.4. TONE DIAL TORUBLE 20

8.5. THE ELECTRONIC VOLUME OF THE SPEAKER-PHONE

DOES NOT WORK 21

8.6. THE ELECTRONIC VOLUME OF HANDSET DOES NOT

WORK 21

9 TERMINAL GUIDE OF ICS, TRANSISTORS AND DIODES 22

10 HOW TO REPLACE THE FLAT PACKAGE IC 23

10.1. PREPARATION 23

10.2. FLAT PACKAGE IC REMOVE PROCEDURE 23

10.3. FLAT PACKAGE IC INSTALLATION PROCEDURE 24

10.4. BRIDGE MODIFICATION PROCEDURE 24

11 CABINET AND ELECTRICAL PARTS LOCATION 25

12 ACCESSORIES AND PACKING MATERIALS 26

13 REPLACEMENT PARTS LIST 27

13.1. CABINET AND ELECTRICAL PARTS 27

13.2. ACCESSORIES AND PACKING MATERIALS 27

13.3. MAIN BOARD PARTS 27

14 FOR THE SCHEMATIC DIAGRAM 31

15 SCHEMATIC DIAGRAM 32

16 PRINTED CIRCUIT BOARD (MAIN BOARD) 34

16.1. COMPONENT VIEW 34

16.2. BOTTOM VIEW 35

CONTENTS

Page Page

KX-T7730X

1 INTRODUCTION

1.1. NOTE

When you note the serial number, write down all of the 11 digits.

The serial number may be found on the label affixed to the bottom of the unit.

1.2. FOR SERVICE TECHNICIANS

ICs and LSIs are vulnerable to static electricity.

When repairing, the following precautions will help prevent recurring malfunctions.

1.Cover the plastic parts boxes with aluminum foil.

2.Ground the soldering irons.

3.Use a conductive mat on the worktable.

4.Do not touch IC or LSI pins with bare fingers.

KX-T7730X

2 LOCATION OF CONTROLS

KX-T7730X

3 CONNECTION

Caution:

Ensure the cord is inserted in the groove to prevent damage to the connector.

KX-T7730X

4 DISASSEMBLY INSTRUCTIONS

1. Remove the Stand.

2. Remove 4 Screws (A).

3. Remove the Bottom Cabinet.

4. Remove the Connector (1~3) and the Flat Cable from the Main Board.

KX-T7730X

5. Remove 2 Screws (A).

6. Remove the Main Board from the Top Cabinet.

7. Remove the Cable from the Main Board.

8. Remove the LCD Holder by sliding the Hook in the direction of the

arrow from the Main Board.

KX-T7730X

5 IC DATA

Pin No. Terminal Name I/O Function I/O Setting Description

1RE0 I I LCD linage H:3line Model L:Other

2TEST I - Vcc Connection

3OSC1 I - 4MHz

4OSC2 O - 4MHz

5RESET I -

6X1 I - Not used Vcc Connection

7X2 O - Open

8 GND - -

9D0 I/O O HS SM mute

10 D1 I/O O HF MM mute

11 D2 I/O O( I ) HF SM mute(This is also model code.)

12 D3 I/O O HF Relay

13 D4 I/O O HS power on

14 D5 I/O O HF power on (CS)

15 D9 I/O I HOLD Key L:Key press

16 D10 I/O O DO

17 D11 I/O O DCLR

18 D12 I I DI

19 D13 I I DI_INT

20 R00 I/O I KEY-IN0

21 R01 I/O I KEY-IN1

22 R02 I/O I KEY-IN2

23 R03 I/O I KEY-IN3

24 R10 I/O I KEY-IN4

25 R11 I/O I KEY-IN5

26 R12 I/O I KEY-IN6

27 R13 I/O I Hook-SW

28 R20 I/O O KEY/LED-COM0

29 R21 I/O O KEY/LED-COM1

30 R22 I/O O KEY/LED-COM2

31 R23 I/O O KEY/LED-COM3

32 R30 I/O I/O KEY-COM4

33 R33 I/O O( I ) LCD_Contrast1(This is also model code.)

34 R32 I/O O *LCD_Contrast0

35 R31 I/O I/O KEY-COM5

36 R40 I/O I Ring vol off

KX-T7730X

Pin No. Terminal Name I/O Function I/O Setting Description

37 R41 I/O O LCD_CLK

38 R42 I/O O( I ) LCD_STB/(Model Code)

39 R43 I/O O LCD_DO

40 R60 I/O O LED0

41 R61 I/O O LED1

42 R62 I/O O LED2

43 R63 I/O O LED3

44 R70 I/O O LED4

45 R71 I/O O LED5

46 R72 I/O O LED6

47 R73 I/O O LED7

48 R80 I/O O HF SP vol 1

49 R81 I/O O HF SP vol 2

50 R82 I/O O HF SP vol 3

51 R83 I/O O HF SP vol 4

52 R90 I/O O Tone cont 1

53 R91 I/O O Tone cont 2

54 R92 I/O O Tone cont 3

55 R93 I/O O Tone cont 4

56 RA0 I/O O HS SP vol 1

57 RA1 I/O O HS SP vol 2

58 SEL I I A Four-minute Cycle Vcc Connection

59 VCC - -

60 TONC O O DTMF Column

61 TONR O O DTMF Row

62 VTref - - DTMF Standard Power

63 RD0 I I Head Set Detention

64 RD1 I I TONE-DET

KX-T7730X

6 BLOCK DIAGRAM

USD PRIVING

CIRCUIT

(Q105~108)

POWER

REGULATOR

(IC7)

SIGNAL

TRANSMITTING

CIRCUIT(Q101)

SIGNAL

RECEIVING

CIRCUIT(Q102)

(IC2)

RESET IC

(IC9)

Vcc

CPU

(IC1)

DRIVING

CIRCUIT

(Q103,Q104)

LED

LCD

KEY

LCD Module

RINGER

DTMF

SPEAKER

MIC

HEADSET

HANDSET

SP-PHONE

(IC3)

Handset Amp

(Q5,Q8)

Pre Amp

(Q4)

HYBRID

CIRCUIT

(Q3)

DIODE

BRIDGE

(D1)

DIODE

BRIDGE

(D2)

KX-T7730X MAIN BOARD

KX-T7730X

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