Panasonic KX-T7665AL, KX-T7665X Service Manual

ORDER NO. KMS0307792C3

Digital Proprietary Telephone

KX-T7665AL KX-T7665X

(for Australia, Asia, Middle Near East, Africa and Latin

America)

IMPORTANT INFORMATION ABOUT LEAD FREE, (PbF), SOLDERING

If lead free solder was used in the manufacture of this product the printed circuit boards will be marked PbF. Standard leaded, (Pb), solder can be used as usual on boards without the PbF mark.

When this mark does appear please read and follow the special instructions described in this manual on the use of PbF and how it might be permissible to use Pb solder during service and repair work.

KX-T7665AL / KX-T7665X

CONTENTS

Page Page

1 ABOUT LEAD FREE SOLDER (PbF: Pb free) 3

1.1. SUGGESTED PbF SOLDER

1.2. HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED

2 FOR SERVICE TECHNICIANS 3 SPECIFICATIONS 4 LOCATION OF CONTROLS 5 CONNECTION 6 DISASSEMBLY INSTRUCTIONS 7 HOW TO REPLACE A FLAT PACKAGE IC

7.1. PREPARATION

7.2. PROCEDURE

7.3. REMOVING SOLDER FROM BETWEEN PINS

8 TROUBLESHOOTING GUIDE

8.1. NO OPERATION

8.2. LCD DOES NOT OPERATE

8.3. HANDSET DOES NOT WORK

8.4. SPEAKER-PHONE TROUBLE

8.5. DXDP-DPT DOES NOT WORK

9 BLOCK DIAGRAM 10 CIRCUIT OPERATIONS

10.1. KEY INPUT CONTROL CIRCUIT

10.2. LCD CONTROL CIRCUIT

10 11 12 13

14 15

15 16

5 5 5 6 7 8

8 8 8

10.3. LED CIRCUIT

10.4. RESET CIRCUIT

10.5. POWER SUPPLY CIRCUIT

10.6. DATA COMMUNICATION

10.7. DXDP COMMUNICATION

10.8. ANALOG CIRCUIT

11 IC DATA

11.1. IC2

11.2. IC6

12 TER MINAL GUIDE OF ICs, TRANSISTORS AND DIODES 13 CABINET AND ELECTRICAL PARTS LOCATION 14 ACCESSORIES AND PACKING MATERIALS 15 REPLACEMENT PARTS LIST

15.1. CABINET AND ELECTRICAL PARTS

15.2. ACCESSORIES AND PACKING MATERIALS

15.3. MAIN BOARD PARTS

16 FOR THE SCHEMATIC DIAGRAM 17 SC HEMATIC DIAGRAM 18 WAVEFORM 19 PRINTED CIRCUIT BOARD (MAIN BOARD)

19.1. COMPONENT VIEW

19.2. BOTTOM VIEW

17 18 18 19 20 21

23 25

26 27 28 29

29 29 29

31 32 34 37

37 38

KX-T7665AL / KX-T7665X

1 ABOUT LEAD FREE SOLDER (PbF: Pb free)

Note:

In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder that contains lead.

We will use PbF solder when discussing the lead free solder used in our manufacturing process which is made from Tin, (Sn), Silver, (Ag), and Copper, (Cu).

This model, and others like it, manufactured using lead free solder will have PbF stamped on the PCB. For service and repair work we suggest using the same type of solder although, with some precautions, standard Pb solder can also be used.

Caution

· PbF solder has a melting point that is 50° ~ 70° F, (30° ~ 40°C) higher than Pb solder. Please use a soldering iron with temperature control and adjust it to 700° ± 20° F, (370° ± 10°C). In case of using high temperature soldering iron, please be careful not to heat too long.

· PbF solder will tend to splash if it is heated much higher than its melting point, approximately 1100°F, (600°C).

· If you must use Pb solder on a PCB manufactured using PbF solder, remove as much of the original PbF solder as possible

and be sure that any remaining is melted prior to applying the Pb solder.

· When applying PbF solder to double layered boards, please check the component side for excess which may flow onto the opposite side (See figure, below).

1.1. SUGGESTED PbF SOLDER

There are several types of PbF solder available commercially. While this product is manufactured using Tin, Silver, and Copper, (Sn+Ag+Cu), you can also use Tin and Copper, (Sn+Cu), or Tin, Zinc, and Bismuth, (Sn+Zn+Bi).

Please check the manufacturer’s specific instructions for the melting points of their products and any precautions for using their product with other materials.

The following lead free (PbF) solder wire gauges are recommended for service of this product: 0.3mm, 0.6mm and 1.0mm.

KX-T7665AL / KX-T7665X

1.2. HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED

PbF is stamped to show that Pb free solder is used. (See the figure below.)

R306

R310

Q32

R308

R309

R311

Q31

R307

R516

C104 C103 R100

B2 B1

R519

R520

R119 C107

R112

R115

Q33 Q34 Q35

R305

R302

R301

R303

R402

PN9

R521

R517

R406

R129

C401

R116 R114

C101

R113

C108

R110

C105

R109 R111

R117

C106

C114

C120

R136

R135

D3V

C117

R200

PSUP1439Z-A

PbF

CN3

R304

R300

R407

IC2

33 48

C407

R103

R102 C100

C406

R101

R106

R105

IC7

R108

C102

R107

R104

C113

R134

R133

R139

R138

R137

C204

C205

C607 C606

32 49

33 48

C400

C403

R403

R132

C115

R401

R130

D21

Q21

L21

CN2

R400

C111

C109

C404

C405

R131

C201

C402

C116

PSUP1439Z-B

PbF

D43

IC6

D44

R202

R201

C200

C505

R610

IC1

R208 R204

AG2 MIC2

R601

C602

R209

R518

R602

JK1

C203

C202

R526

CN5

C605

101

R206

R515

R604 R603

R611

R609 R608

C118 C112

R524

C110

R207

R525

R600

D5V

R140

R119

R203 R205

C522

R513

R607

R114

IC3

C601

IC5

R142

Q22

Q23

C524

C600

C609

GND

R506

R512 C514

R505

D63

D62

C523

C528

C516

C506

R511

IC8

C603

D61

R514

C515

R507

C604

R605 C608 R606 R503 C503 C510 C521

C508 C507

C517

IC4

C519 C502

R502

L51

R527

C518

C511

C520

C512

L52

MIC1

C525

R510

C526

SP1

SPN SPP

C509 R509

R500

R501

JK2

JK3

C501

RU CNGen

C513

AG1

R523

R504 C504

R508

A3V

C527

Q51

C500

CN1

GRA

Q52

R522

Marked PbF

KX-T7665AL / KX-T7665X : MAIN BOARD

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 SPECIFICATIONS

Station Loop Limit: 90 ohms Calling Method: 2 pair wire Jacks: Handset Jack, TEL Jack Dimensions: Low Angle:

High Angle:

Weight: 0.7 kg

213 (D)mm × 177 (W)mm × 107 (H)mm 201 (D)mm × 177 (W)mm × 127 (H)mm

KX-T7665AL / KX-T7665X

Design and specifications are subject to change without notice.

4 LOCATION OF CONTROLS

KX-T7665AL / KX-T7665X

5 CONNECTION

Caution:

The availability of D-XDP function depends on the software version of the connected Business Telephone System. Consult your dealer for more details about D-XDP.

6 DISASSEMBLY INSTRUCTIONS

1. Remove the Stand.

2. Remove 5 Screws (A).

3. Remove the Cabinet Cover.

KX-T7665AL / KX-T7665X

4. Remove the Connector from the Main Board.

5. Remove 2 Screws (A).

6. Remove the Main Board and the LCD from the Cabinet Body.

KX-T7665AL / KX-T7665X

7 HOW TO REPLACE A FLAT PACKAGE IC

7.1. PREPARATION

· PbF (: Pb free) Solder

· Soldering Iron

Tip Temperature of 700°F±20°F (370°C±10°C) Note: We recommend a 30 to 40 Watt soldering iron. An

expert may be able to use a 60 to 80 Watt iron where someone with less experience could overheat and damage the PCB foil.

· Flux Recommended Flux: Specific Gravity → 0.82. Type → RMA (lower residue, non-cleaning type) Note: See ABOUT LEAD FREE SOLDER (PbF: Pb free)

(P.3).

7.2. PROCEDURE

1. Tack the flat pack IC to the PCB by temporarily soldering two diagonally opposite pins in the correct positions on the PCB.

7.3. REMOVING SOLDER FROM BETWEEN PINS

1. Add a small amount of solder to the bridged pins.

2. With a hot iron, use a sweeping motion along the flat part of

the pin to draw the solder from between the adjacent pads.

Be certain each pin is located over the correct pad on the PCB.

2. Apply flux to all of the pins on the IC.

3. Being careful to not unsolder the tack points, slide the soldering iron along the tips of the pins while feeding enough solder to the tip so that it flows under the pins as they are heated.

8 TROUBLESHOOTING GUIDE

8.1. NO OPERATION

KX-T7665AL / KX-T7665X

Note:

Refer to (1)~(4) of WAVEFORM (P.34) for waveform.

KX-T7665AL / KX-T7665X

8.2. LCD DOES NOT OPERATE

Note:

Refer to (5)ofWAVEFORM(P.34) for waveform.

8.3. HANDSET DOES NOT WORK

Receive

KX-T7665AL / KX-T7665X

Send

Note:

Refer to (6)~(7) of WAVEFORM (P.34) for waveform.

KX-T7665AL / KX-T7665X

8.4. SPEAKER-PHONE TROUBLE

Receive

Send

Note:

Refer to (6)~(7) of WAVEFORM (P.34) for waveform.

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