DOWNLOAD Panasonic KX-TDA620BX (serv.man8) Service Manual ↓ Size: 5.85 MB | Pages: 67 in PDF or view online for FREE

ORDER NO. KMS1712002SE

Model No.

KX-TDA620

C

A

Suffix

3

Sup No.

KMS0607279CE

Service Manual

Order No.

When servicing, you must confirm which service manual should be referred by the following methods.

Compatibility

Parts

Set Production

Original

New

Early (before change)

Late (after change)

BUS-S Board Ass'y

Original or new parts may be used in early or late production sets.
Use original parts until exhausted, then stock new parts.

Single Parts

Original parts may be used in early production sets only. 
New parts may be used in late production sets only. Stock both original 
and new parts.

Original

New

Early (before change)

Late (after change)

Refer to “PSUP1513YA”

R214

CN201

1

8

7

14

QA102

CN202

1

7

R

R2

R2

R243

R244

R257

C222

RA313

C223

C224

C225

R267

R268

R269

R270

R271

R272

R273

R274

R275

C241

C242

Q102

C

LED101

L703

R102

R103

J218

R706

R707

R708

R709

R710

R712

R714

R715

R721

R7

R724

C302

C303

R727

C304

R728

R729

C306

C308

R730

RA209

R731

C310

C312

C313

R737

RA210

R738

RA211

R739

RA212

RA21

RA21

RA219

RA220

RA221

RA222

C32

RA223

RA228

RA229

RA230

C720

C722

C723

C733

C738

+

-

C744

C759

C760

C761

C763

C764

D704

C765

D705

27

28

IC305

IC306

C770

SW201

1

2

IC705

1

4

5

8

J104

R207

PSUP1513YA-GW

94V-0

KX-TDA620

IP702

U.S.A.

D

C

3

KX-TDA620AL

KMS0510153CE

Australia

D

C

3

KX-TDA620BR

KMS0604221CE

Brazil

Destination

E

D

7

F)

(E

KX-TDA620BX

(KX-TDA620BX-SX)

KMS0510154CE

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

D

C

5

KX-TDA620EJ

KMS0602205CE

Hong Kong, Malaysia and Singapore

B

A

4

KX-TDA620SU

KMS1003770CE

Saudi Arabia

D

C

6

KX-TDA620TW

KMS0512170CE

Taiwan

2

PAGE

PAGE

1 Safety Precautions -----------------------------------------------3

1.1. For Service Technicians  ---------------------------------3

2 Warning --------------------------------------------------------------3

2.1. Information for Users on Collection and

Disposal of Old Equipment and used Batteries-----3

2.2. Battery Caution ---------------------------------------------4
2.3. Caution--------------------------------------------------------4
2.4. About Lead Free Solder (PbF: Pb free) --------------4

2.4.1. Suggested PbF Solder -------------------------------4

2.5. Discarding of P. C. Board --------------------------------4

3 Specifications ------------------------------------------------------5

3.1. General Description ---------------------------------------5
3.2. Characteristics ----------------------------------------------5

4 Technical Descriptions------------------------------------------6

4.1. Block Diagram ----------------------------------------------6
4.2. BUS-S Card Circuit Operation --------------------------7

4.2.1. BUS-S Card---------------------------------------------7
4.2.2. Description of Each Part-----------------------------8
4.2.3. Circuit Description-------------------------------------9

4.3. Back Board Circuit Operation ------------------------- 11
4.4. Outline ------------------------------------------------------ 12

4.4.1. General Description--------------------------------- 12

4.5. System Control ------------------------------------------- 13

4.5.1. System Control Block Diagram ------------------ 13
4.5.2. Voice (TDM Highway) Bus Block Diagram---- 14
4.5.3. Voice Bus Logical Assignment ------------------- 15
4.5.4. TDM Signaling --------------------------------------- 15

4.6. Back Board Signal Connection Diagram ----------- 16

4.6.1. CT Bus System Connection Diagram ---------- 16
4.6.2. EC Bus System Connection Diagram ---------- 17
4.6.3. System Control and Analog Signal

Connection Diagram-------------------------------- 18

4.6.4. Power Supply System Connection

Diagram------------------------------------------------ 18

5 Location of Controls and Components------------------ 19

5.1. Name and Locations ------------------------------------ 19

5.1.1. Expansion System ---------------------------------- 19

6 Installation Instructions--------------------------------------- 23

6.1. System Overview----------------------------------------- 23

6.1.1. System Connection Diagram --------------------- 23

7 Operating Instructions ---------------------------------------- 25

7.1. System Capacity ----------------------------------------- 25

7.1.1. Number of Free Slots------------------------------- 25
7.1.2. Maximum Trunk and Extension ------------------ 25
7.1.3. Maximum Optional Service Cards -------------- 25
7.1.4. Maximum Terminal Equipment------------------- 26
7.1.5. Power Supply Unit Selection for Each

Shelf ---------------------------------------------------- 27

8 Troubleshooting Guide---------------------------------------- 29

8.1. BUS-S CARD --------------------------------------------- 29

9 Service Fixture & Tools--------------------------------------- 35

9.1. EXTENSION BOARDS FOR SERVICING -------- 35

10 Disassembly and Assembly Instructions -------------- 36

10.1. BUS-S Card ----------------------------------------------- 36
10.2. Back Board ------------------------------------------------ 37

11 Miscellaneous --------------------------------------------------- 39

11.1. How To Replace a Flat Package IC ----------------- 39

11.1.1. Preparation ------------------------------------------- 39
11.1.2. Removal Procedure -------------------------------- 39
11.1.3. Procedure--------------------------------------------- 39
11.1.4. Removing Solder From Between Pins--------- 39

12 Schematic Diagram -------------------------------------------- 40

12.1. BUS-S Block Diagram ---------------------------------- 40
12.2. BUS-S Board No.1 -------------------------------------- 41
12.3. BUS-S Board No.2 -------------------------------------- 42
12.4. BUS-S Board No.3 -------------------------------------- 43
12.5. BUS-S Board No.4 -------------------------------------- 44
12.6. BUS-S Board No.5 -------------------------------------- 45
12.7. BUS-S Board No.6 -------------------------------------- 46
12.8. BUS-S Board No.7 -------------------------------------- 47
12.9. BB-EXP Board No.1 ------------------------------------ 48

12.10. BB-EXP Board No.2 ------------------------------------ 50

12.11. BB-EXP Board No.3 ------------------------------------ 52

12.12. Waveform -------------------------------------------------- 54

13 Printed Circuit Board------------------------------------------ 55

13.1. BUS-S Board --------------------------------------------- 55

13.1.1. Component View ------------------------------------ 55

13.2. BB-EXP Board-------------------------------------------- 56

13.2.1. Component View ------------------------------------ 56

14 Appendix Information of Schematic Diagram -------- 57
15 Exploded View and Replacement Parts List----------- 58

15.1. Cabinet and Electrical Parts Location -------------- 58
15.2. Accessories and Packing Material ------------------ 60
15.3. Replacement Parts List -------------------------------- 61

15.3.1. Cabinet and Electrical Parts---------------------- 61
15.3.2. Accessories and Packing Materials ------------ 61
15.3.3. BBS-S Card Parts ---------------------------------- 62
15.3.4. BB-EXP Board Parts ------------------------------- 67
15.3.5. Fixtures and Tools ---------------------------------- 67

3

1. Before servicing, unplug the AC power cord to prevent an electric shock.
2. When replacing parts, use only the manufacturer's recommended components.
3. Check the condition of the power cord. Replace if wear or damage is evident.
4. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.
5. Before returning the serviced equipment to the customer, be sure to perform the following insulation resistance test to prevent

the customer from being exposed to shock hazards.

• Repair service shall be provided in accordance with repair technology information such as service manual so as to prevent fires,

injury or electric shock, which can be caused by improper repair work.

1. When repair services are provided, neither the products nor their parts or members shall be remodeled.
2. If a lead wire assembly is supplied as a repair part, the lead wire assembly shall be replaced.
3. FASTON terminals shall be plugged straight in and unplugged straight out.

• ICs and LSIs are vulnerable to static electricity.

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

1. Cover plastic parts boxes with aluminum foil.
2. Ground the soldering irons.
3. Use a conductive mat on worktable.
4. Do not grasp IC or LSI pins with bare fingers.

4

1. Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the

manufacturer. Dispose of used batteries according to the manufacturer's lnstructions. 

2. The lithium battery is a critical component (type No.CR23541). Please observe for the proper polarity and the exact location

when replacing it and soldering the replacement lithium battery in.

The power socket wall outlet should be located near this equipment and be easily accessible.

In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder that con-
tains lead.
We will use PbF 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. 

• PbF solder has a melting point that is 50° ~ 70° F, (30° ~ 40°C) higher than Pb solder. Please use a soldering iron with tempera-

ture control and adjust it to 700° ± 20° F, (370° ± 10°C). 
Exercise care while using higher temperature soldering irons.:
Do not heat the PCB for too long time in order to prevent solder splash or damage to the PCB.

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

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 manufac
turer'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 sizes are recommended for service of this product: 0.3mm, 0.6mm and 1.0mm.

When discarding P. C. Board, delete all personal information such as telephone directory and caller list or scrap P. C. Board.