1
ABOUT LEAD FREE SOLDER (PbF: Pb free)
3
1.1.
SUGGESTED PbF SOLDER
3
1.2.
HOW TO RECOGNIZE THAT Pb FREE SOLDER IS
USED
4
2
FOR SERVICE TECHNICIANS
5
3
SPECIFICATIONS
5
4
LOCATION OF CONTROLS
5
5
CONNECTION
6
6
DISASSEMBLY INSTRUCTIONS
7
7
HOW TO REPLACE A FLAT PACKAGE IC
8
7.1.
PREPARATION
8
7.2.
PROCEDURE
8
7.3.
REMOVING SOLDER FROM BETWEEN PINS
8
8
TROUBLESHOOTING GUIDE
9
8.1.
NO OPERATION
9
8.2.
LCD DOES NOT OPERATE
10
8.3.
HANDSET DOES NOT WORK
11
8.4.
SPEAKER-PHONE TROUBLE
12
8.5.
DXDP-DPT DOES NOT WORK
13
9
BLOCK DIAGRAM
14
10 CIRCUIT OPERATIONS
15
10.1. KEY INPUT CONTROL CIRCUIT
15
10.2. LCD CONTROL CIRCUIT
16
10.3. LED CIRCUIT
17
10.4. RESET CIRCUIT
18
10.5. POWER SUPPLY CIRCUIT
18
10.6. DATA COMMUNICATION
19
10.7. DXDP COMMUNICATION
20
10.8. ANALOG CIRCUIT
21
11 IC DATA
23
11.1. IC2
23
11.2. IC6
25
12 TERMINAL GUIDE OF ICs, TRANSISTORS AND DIODES
26
13 CABINET AND ELECTRICAL PARTS LOCATION
27
14 ACCESSORIES AND PACKING MATERIALS
28
15 REPLACEMENT PARTS LIST
29
15.1. CABINET AND ELECTRICAL PARTS
29
15.2. ACCESSORIES AND PACKING MATERIALS
29
15.3. MAIN BOARD PARTS
29
16 FOR THE SCHEMATIC DIAGRAM
31
17 SCHEMATIC DIAGRAM
32
18 WAVEFORM
34
19 PRINTED CIRCUIT BOARD (MAIN BOARD)
37
19.1. COMPONENT VIEW
37
19.2. BOTTOM VIEW
38
CONTENTS
Page
Page
2
KX-T7665AL / KX-T7665X