KX-HDV20RU - Panasonic PBX Service Manual (repair manual)

ORDER NO. KMS1508152CE

Ver.No

Model No.

Destination

1

KX-HDV20NE

KX-HDV20NEB

Europe

KX-HDV20B

KX-HDV20

USA, Canada

KX-HDV20X

KX-HDV20XB

Asia,Africa and Other area

White Version

Black Version

2

KX-HDV20RUB

KX-HDV20RU

Russia, Ukraine, Kazakhstan

3

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. About Lead Free Solder (PbF: Pb free) --------------4

2.2.1. Suggested PbF Solder -------------------------------4

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

3 Specifications ------------------------------------------------------5
4 Technical Descriptions------------------------------------------6

4.1. Block Diagram ----------------------------------------------6
4.2. Circuit Operations ------------------------------------------7

4.2.1. Power supply Circuit----------------------------------7
4.2.2.  Key Circuit ----------------------------------------------8
4.2.3. LED Circuit ----------------------------------------------8
4.2.4. Self Label LCD Circuit--------------------------------9
4.2.5. Data Communication Circuit(USB)----------------9

5 Location of Controls and Components------------------ 10

5.1. Name and Locations ------------------------------------ 10

6 Installation Instructions--------------------------------------- 11

6.1. Connections ----------------------------------------------- 11

7 Test Mode ---------------------------------------------------------- 12

7.1. Preparation ------------------------------------------------ 12
7.2. HDV20 Test ------------------------------------------------ 12

8 Troubleshooting Guide---------------------------------------- 13

8.1. No Operation ---------------------------------------------- 13

8.1.1. Power ON Error-------------------------------------- 13

8.2. LCD Does Not Operate --------------------------------- 14
8.3. LED Does Not Light ------------------------------------- 15
8.4. HDV20(Upper or Lower) Communication

Error --------------------------------------------------------- 15

9 Disassembly and Assembly Instructions --------------- 16

9.1. Remove Main Board------------------------------------- 16
9.2. Assembly for Lead wire--------------------------------- 17

10 Maintenance ------------------------------------------------------ 18

10.1. Terminal Guide of the ICs Transistors and

Diodes------------------------------------------------------- 18

10.1.1. Main Board-------------------------------------------- 18
10.1.2. Back Light Board ------------------------------------ 18

10.2. How To Replace a Flat Package IC ----------------- 19

10.2.1. Preparation-------------------------------------------- 19
10.2.2. Removal Procedure--------------------------------- 19
10.2.3. Procedure --------------------------------------------- 19
10.2.4. Removing Solder From Between Pins --------- 19

11 Schematic Diagram--------------------------------------------- 20

11.1. Main --------------------------------------------------------- 20
11.2. Back Light -------------------------------------------------- 21
11.3. Waveform -------------------------------------------------- 22

12 Printed Circuit Board ------------------------------------------ 23

12.1. Main Board------------------------------------------------- 23

12.1.1. Component View ------------------------------------ 23
12.1.2. Bottom View ------------------------------------------ 24

12.2. Back Light Board ----------------------------------------- 25

13 Appendix Information of Schematic Diagram --------- 26
14 Exploded View and Replacement Parts List ----------- 27

14.1. Cabinet and Electric Parts ----------------------------- 27
14.2. Accessories and Packing Materials ----------------- 28
14.3. Replacement Parts List --------------------------------- 29

14.3.1. Cabinet and Electrical Parts---------------------- 29
14.3.2. Accessories and Packing Materials ------------ 29
14.3.3. Main Board Parts ----------------------------------- 30

15 History-------------------------------------------------------------- 32

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

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.

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

temperature control and adjust it to 700 °F ± 20 °F (370 °C ± 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 the 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.