Panasonic KX-T7730X User manual

©2001 Kyushu Matsushita Electric Co., Ltd. All
rights reserved. Unauthorized copying and
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
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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.
3
KX-T7730X

2 LOCATION OF CONTROLS
4
KX-T7730X

3 CONNECTION
Caution:
Ensure the cord is inserted in the groove to prevent damage to the connector.
5
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.
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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.
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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
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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
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KX-T7730X

6 BLOCK DIAGRAM
USD PRIVING
CIRCUIT
(Q105~108)
H
L
T
R
T2
POWER
REGULATOR
(IC7)
SIGNAL
TRANSMITTING
CIRCUIT(Q101)
SIGNAL
RECEIVING
CIRCUIT(Q102)
FF
(IC2)
RESET IC
(IC9)
Vcc
CPU
(IC1)
X1
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)
T1
KX-T7730X MAIN BOARD
KX-T7730X
10