DOWNLOAD Panasonic KX-NT680RU-B Service Manual ↓ Size: 6.4 MB | Pages: 70 in PDF or view online for FREE

ORDER NO. KMS1809180CE

Ver.No

Model No.

Destination

1

KX-NT680NE

KX-NT680NE-B

Europe

KX-NT680UK-B

KX-NT680UK

Europe

KX-NT680

KX-NT680C-B

KX-NT680-B

North America
Canada

White Version

Black Version

2

KX-NT680X

KX-NT680X-B

Asia,Latin America,
Middle East,Africa,Oceania

KX-NT680MS

KX-NT680MS-B Malaysia

KX-NT680SX

KX-NT680SX-B

India

3

KX-NT680RU

KX-NT680RU-B Russian,Ukrainian,Kazakh

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2

PAGE

PAGE

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

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

2 Warning --------------------------------------------------------------4

2.1. Battery Caution ---------------------------------------------4

2.1.1. Information for Users on Collection and

Disposal of Old Batteries ----------------------------4

2.2. Caution--------------------------------------------------------5
2.3. About Lead Free Solder (PbF: Pb free) --------------6

2.3.1. Suggested PbF Solder -------------------------------7

2.4. Discarding of P. C. Board --------------------------------7

3 Specifications ------------------------------------------------------8
4 Technical Descriptions------------------------------------------9

4.1. Block Diagram ----------------------------------------------9
4.2. Circuit Operations ---------------------------------------- 10

4.2.1. Color TFT LCD display----------------------------- 10
4.2.2. Reset Circuit ------------------------------------------ 10
4.2.3. Ethernet Circuit -------------------------------------- 11
4.2.4. PoE Circuit -------------------------------------------- 12
4.2.5. Analog Circuit ---------------------------------------- 13
4.2.6. Key Circuit--------------------------------------------- 14
4.2.7. LED Circuit -------------------------------------------- 14
4.2.8. ASIC ---------------------------------------------------- 15
4.2.9. BT(Bluetooth) Module ------------------------------ 15

4.2.10. Power Supply Circuit ------------------------------- 16

5 Location of Controls and Components------------------ 17

5.1. Names and Locations ----------------------------------- 17

6 Installation Instructions--------------------------------------- 20

6.1. Connections ----------------------------------------------- 20

7 Test Mode ---------------------------------------------------------- 21

7.1. Loopback Test Mode ------------------------------------ 21

7.1.1. Preparation-------------------------------------------- 21
7.1.2. Communication Test -------------------------------- 21
7.1.3. Quit Test Mode for communication test  ------- 22

7.2. Functional Test Mode ----------------------------------- 22

7.2.1. Preparation-------------------------------------------- 22
7.2.2. Functional Test mode lists------------------------- 22
7.2.3. Quit this Test Mode --------------------------------- 23

8 Service Mode ----------------------------------------------------- 24

8.1. Factory Setting-------------------------------------------- 24

8.1.1. How to Clear User Setting ------------------------ 24

8.2. How to Change MAC Address Label---------------- 24

8.2.1. Replacing Main P.C.B. ----------------------------- 24
8.2.2. Attaching MAC Address Label ------------------- 25

9 Troubleshooting Guide---------------------------------------- 26

9.1. No Operation ---------------------------------------------- 26

9.1.1. Power ON Error-------------------------------------- 26
9.1.2. Power Supply : AC adaptor ----------------------- 26
9.1.3. Power Supply : PoE -------------------------------- 27

9.2. Color LCD Does Not Operate ------------------------- 31

9.2.1. Color LCD Not Operate ---------------------------- 31

9.3. Handset Does Not work -------------------------------- 32

9.3.1. Receive ------------------------------------------------ 32
9.3.2. Send ---------------------------------------------------- 32

9.4. Headset Does Not work -------------------------------- 33

9.4.1. Receive ------------------------------------------------ 33
9.4.2. Send ---------------------------------------------------- 33

9.5. Speaker-Phone Does Not work----------------------- 34

9.5.1. Receive ------------------------------------------------ 34

9.5.2. Send---------------------------------------------------- 34

9.6. BT (Bluetooth) Does Not work ----------------------- 35
9.7. EHS Does Not work (EHS control signal) --------- 36
9.8. Ethernet Does Not work ------------------------------- 37

9.8.1. L2SW Data error ------------------------------------ 37
9.8.2. LAN port----------------------------------------------- 38
9.8.3. PC port ------------------------------------------------ 38

9.9. LCD back light and LED Not Light ------------------ 39

10 Disassembly and Assembly Instructions -------------- 40

10.1. Remove Main Board ------------------------------------ 40
10.2. Remove LCD --------------------------------------------- 41
10.3. Assembly LCD-------------------------------------------- 42
10.4. Assembly for Lead wire -------------------------------- 42

11 Maintenance------------------------------------------------------ 43

11.1. How To Replace a Flat Package IC ----------------- 43

11.1.1. Preparation ------------------------------------------- 43
11.1.2. Removal Procedure -------------------------------- 43
11.1.3. Procedure--------------------------------------------- 43
11.1.4. Removing Solder From Between Pins--------- 43

11.2. How to Replace the LLP (Leadless Leadframe

Package) IC and IC ground plate-------------------- 44

11.2.1. Preparation ------------------------------------------- 44
11.2.2. Caution ------------------------------------------------ 44
11.2.3. How to Remove the IC ---------------------------- 44
11.2.4. How to Install the IC -------------------------------- 44
11.2.5. How to Remove a Solder Bridge (Doesn't

apply to IC ground plate.) ------------------------- 45

12 Schematic Diagram -------------------------------------------- 46

12.1. Main Board ------------------------------------------------ 46
12.2. Waveform -------------------------------------------------- 53

12.2.1. No. (1) - (8) ------------------------------------------- 53
12.2.2. No. (9) - (16) ----------------------------------------- 54
12.2.3. No. (17) - (24)---------------------------------------- 55
12.2.4. No. (25) - (32)---------------------------------------- 56
12.2.5. No. (33), (34)----------------------------------------- 57

13 Printed Circuit Board------------------------------------------ 58

13.1. Main Board ------------------------------------------------ 58

13.1.1. Component View ------------------------------------ 58
13.1.2. Bottom View ------------------------------------------ 59

14 Appendix Information of Schematic Diagram -------- 60
15 Exploded View and Replacement Parts List----------- 61

15.1. Cabinet and Electric Parts----------------------------- 61
15.2. Accessories and Packing Materials ----------------- 62
15.3. Replacement Parts List -------------------------------- 63

15.3.1. Cabinet and Electrical Parts---------------------- 63
15.3.2. Accessories and Packing Materials ------------ 64
15.3.3. Main Board Parts ----------------------------------- 64

16 History-------------------------------------------------------------- 69

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.CR2032/VC1N). Please observe for the proper polarity and the exact loca-

tion when replacing it and soldering the replacement lithium battery in.

These symbols ((1), (2), (3)) on the products, packaging, and/or accompanying documents mean that used electrical and elec-
tronic products and batteries should not be mixed with general household waste.
For proper treatment, recovery and recycling of old products and used batteries, please take them to applicable collection 
points, in accordance with your national legislation and the Directives 2002/96/EC and 2006/66/EC.
By disposing of these products and batteries correctly, you will help to save valuable resources and prevent any potential nega-
tive effects on human health and the environment which could otherwise arise from inappropriate waste handling. For more 
information about collection and recycling of old products and batteries, please contact your local municipality, your waste dis-
posal service or the point of sale where you purchased the items.
Penalties may be applicable for incorrect disposal of this waste, in accordance with national legislation.

If you wish to discard electrical and electronic equipment, please contact your dealer or supplier for further information.

These symbols ((1), (2), (3)) are only valid in the European Union. If you wish to discard these items, please contact your local 
authorities or dealer and ask for the correct method of disposal.

This symbol ((2)) might be used in combination with a chemical symbol ((3)). In this case it complies with the requirement set by 
the Directive for the chemical involved.