Panasonic KX-TCD420BXM, KX-A142EXM, KX-TCD420BXS, KXA142EXS Service Manual

ORDER NO. KM40308169C8

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Telephone Equipment

KX-TCD420BXM / KX-A142EXM / KX-TCD420BXS / KX-

A142EXS

Digital Cordless Answering System

Metalic Gray Version

Silver Version

(for Asia, Eastern Europe and Other areas)

SPECIFICATIONS

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Unauthorized copying and distribution is a violation of law.

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°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). In

case of using high temperature soldering iron, please be careful

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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 the 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 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.

1.2. How to recognize that Pb Free solder is used

1.2.1. Base Unit PCB

(Component View)

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(Flow Solder Side View)

Note: The location of the “PbF“ mark is subject to change without notice.

1.2.2. Handset PCB

(Component View)

(Flow Solder Side View)

Note: The location of the “PbF“ mark is subject to change without notice.

1.2.3. Charger Unit PCB

Note: The location of the “PbF“ mark is subject to change without notice.

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. CAUTION

Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommendenced by the manufacturer. Dispose of used batteries according to the manufacture’s Instructions.

4. BATTERY

4.1. Battery Installation

Please ensure the batteries are inserted as shown. part should be inserted first. Close the cover as indicated by the arrow.

- When you replace the batteries, part should be removed first.

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4.2. Battery Charge

At the time of shipment, the batteries are not charged. To charge, place the handset on the base unit.

Please charge the batteries for about 7 hours before initial use. During charging, the battery icon

is as shown below.

The handset which power is off will be turned on automatically when it is placed on the base unit. In normal use, the handset and the base unit should be powered on at all times.

Note for Service: The battery strength may not be indicated correctly if the battery is disconnected and connected again, even after it is fully charged. In that case, by recharging the battery as mentioned above, you will get a correct indication of the battery strength.

4.3. Battery Life

- Battery life is dependent on use and conditions but in general when

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using fully charged Ni-MH batteries (700 mAh): Talk time: 10hrs approx. Standby time: 120hrs approx.

- When using Ni-Cd batteries (250 mAh): Talk time: 4hrs approx. Standby time: 40hrs approx. (Times indicated are for peak performance)

- The batteries reach peak performance after several full charge/ discharge cycles.

- The batteries cannot be overcharged unless they are repeatedly removed and replaced.

- If battery life is shortened then please check that battery and charge terminals are clean.

- For maximum battery life, it is recommended that the handset is not

recharged until battery icon flashes .

4.4. Replacing the Batteries

If the icon flashes after a few telephone calls even when the handset batteries have been fully charged, 2 batteries must be replaced. Charge new batteries for approximately 7 hours before initial use. (The telephone line cord must not be connected to the telephone socket at this time). When replacing the batteries, ensure that the correct battery type is selected.

- To exit the operation, press any time.

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- Do not use non-rechargeable batteries. If non-rechargeable batteries are fitted and start charging, it may cause the leakage of the battery electrolyte.

Please use only Panasonic P03P(Ni-MH) or P03H(Ni-Cd) batteries.

Note for Service:

When Ni-Cd batteries are fitted with the setting

in , icon might disappear and stop charging even if the handset is on the cradle for avoiding overcharge.

5. LOCATION OF CONTROLS

5.1. Base Unit

5.2. Handset

6. SETTINGS

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6.1. Connection

6.1.1. Base Unit

Plug in the AC adaptor and the telephone line cord in order 1, 2, 3, 4.

The AC adaptor must remain connected at all times (It is normal for the adaptor to feel warm during use).

- Never install telephone wiring during a lightning storm.

- The unit will not work during a power failure. we recommend you connect a standard telephone on the same line for power protection.

6.1.2. Charger Unit

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The AC adaptor must remain connected at all times (It is normal for the adaptor to feel warm during use).

6.2. Symbols Used in This Service Manual

6.3. PIN Code

6.3.1. Base Unit

- To exit the operation, press any time.

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For Service Hint:

* : If the current 4-digit PIN is forgotten, press and you will be able to enter new PIN. As for the case that Base Unit and Handset are not linked with, refer to Reset Base Unit PIN to

Default (0000) -When There is NO Handset Registered- ()

6.3.2. Handset

- To exit the operation, press any time.

For Service Hint:

* : If the current 4-digit PIN is forgotten, press and

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you will be able to enter new PIN.

6.3.3. Reset Base Unit PIN to Default (0000) -When There is NO Handset

Registered-

6.3.3.1. Symptom

There is no way to reset base PIN when there is no handset registered to the base.

6.3.3.2. Thinkable Situation

- Customer may ask to reset base PIN because they forget it.

- Customer may bring only a base unit for repair and there is no handset registered to the base (Need to register another handset to the base to confirm if the unit works properly after repair).

- When original handset has broken and customer purchased a new one, if customer forget base PIN, customer cannot register the new handset and may ask to reset the PIN.

6.3.3.3. Remedy

<Preparation> Refer to JIGs and PC ().

1. Solder a pin or lead wire to GND, SDA, and SCLK on base PCB.

2. Plug in AC adaptor to the base.

3. Turn on the power to the JIG (9V).

4. Then connect the cable to each pins using clip.

As for the connection between JIG and PCB, see below photos.

1. Refer to PC Setting ().

2. Next, execute <initbspin.bat> by typing "initbspin". The PC display

will be shown as below.

3. After that, turn off DC power supply (9V) to the jig, unplug AC

adaptor, and remove pins on PCB.

options)

Handset

No.

digits)

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Then close the cabinet. The base pin returns to the default (0000) and you can register a handset to the base using the base PIN (0000).

6.4. Reset

6.4.1. Base Unit

If the base unit is reset, the Caller ID list will clear.

- To exit the operation, press any time.

- *1: The factory preset is 0000.

Base Unit Initial Settings

Function Initial Setting Remarks (selectable Ringer Mode All Handsets All Handsets/Specific Number of Rings 3 Up to 6 rings Flash/Earth Flash Flash/Earth Flash Timing 600 msec 600/100/300 msec Pause Timing 3 seconds 3 seconds/5 seconds Call Restricted Handsets All Clear Each Handset can be set

indivisually. Call Restriction Numbers All Clear Up to 10 numbers (up to 4-Digit Base Unit PIN 0000 Dialling Mode Tone Tone/Pulse

6.4.2. Handset

You can reset all of the handset settings to their initial settings.

- To exit the operation, press any time.

options)

Handset

No.

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- *1: The factory preset is 0000.

Handset Initial Settings

Function Initial Setting Remarks (selectable Time Alarm Mode OFF OFF/ON Alarm Time Clear OFF/Once/Daily Handset Ringer Volume 6 Handset External Ringer Pattern 1 20 patterns Handset Internal Ringer Pattern 1 20 patterns Handset Paging Tone Pattern 1 20 patterns Handset Alarm Tone Pattern 1 20 patterns Key Tone ON ON/OFF Call Waiting Tone ON ON/OFF Range Warning Alarm OFF OFF/ON Battery Low Alarm ON ON/OFF Standby Mode Display Clock Clock/OFF/Base No./ Talk Mode Display Talk Time Talk Time/Phone No. Display Language English 10 languages Call BAR OFF OFF/ON Direct Call Mode OFF OFF/ON Direct Call Number Clear Up to 24 digits 4-Digit Handset PIN 0000 Auto Talk OFF OFF/ON Base Unit Access Automatic Base Unit Access Auto/Specific Base Unit Redial Memory All Clear Handset Receiver Volume Medium Low/Medium/High

6.5. Key Lock

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You can lock the handset dialling buttons. Only incoming calls are accepted while the key lock is on. The key lock is cancelled if the handset is turned off.

When the key lock is on, emergency calls cannot be made until key lock is cancelled.

- is displayed (Refer to Handset Display ()) and all dialling buttons are locked.

6.6. Recall Feature

RECALL is used to access special telephone services. Contact your Network provider for details. If your unit is connected to a PBX, pressing RECALL allows you to access some features of your host PBX such as transferring an extension call.

6.7. Dialling Pause for PBX line/long distance service users

A dialling pause is used when a pause in the dialling of the phone number is necessary using a PBX or accessing a long distance service. For example, when 9 (line access number) is dialled followed by a pause to access an outside line through a PBX:

- Entering a pause prevents misdialling when you redial or dial a stored number.

- Pressing PAUSE once creates one pause. To extend the pause requirement time, press PAUSE accordingly.

*1 is displayed (Refer to Handset Display ()) on the LCD.

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6.8. Call Restriction

You can restrict selected handset(s) from dialling selected phone numbers. You can assign up to 10 call restriction numbers (up to 8 digits). If you dial a restricted number, the call does not connect and restricted number flashes.

- To exit the operation, press any time.

- *1: The factory preset is 0000.

- *2: The selected handset number flashes.

6.9. Cancelling Call Restricted Handset(s)

- To exit the operation, press any time.

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- *1: The factory preset is 0000.

- *2: The selected handset(s) will stop flashing.

6.10. Call BAR On/Off (Call Prohibition On/Off)

You cannot make any dialling if Call BAR is on.

When call BAR is on, emergency calls cannot be made until Call BAR is cancelled.

- To exit the operation, press any time.

- *1: The factory preset is 0000.

- *2: If is selected, is displayed (Refer to

Handset Display ()).

6.11. Selecting the Display Language

- To exit the operation, press any time.

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- *1 You can select one of 10 languages. If you set a language you cannot read, reset the handset to its initial settings. Press MENU DOWN RIGHT UP RIGHT 4-digit Handset PIN UP OK All handset setting will be reset to their initial settings, however, the Phonebook data will be saved.

6.12. Selecting Dialling Mode (Tone/Pulse)

You can change the dialling mode to tone or pulse depending upon your network service. If you have a touch tone service, select tone. If you have rotary or pulse service, select pulse.

- To exit the operation, press any time.

- *1: The factory preset is 0000.

6.13. Selecting Flash/Earth Mode

An earth relay can be installed as an option depending on your PBX requirements. Please consult your nearest Panasonic Service Centre for installation. On installation, you can select flash or earth mode to suit your PBX or Network provider.

- To exit the operation, press any time.

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- The factory preset is in shade.

- *1: The factory preset is 0000.

6.14. Summary of Programmable Functions

You can select and execute the following functions by pressing direct command as follows without programming. These operations need to be done with the Handset near the base unit.

Press . Press or until the arrow points to

, then press .

is displayed.*1

*1 If any key is not pressed over 60 seconds, the display will return to “Setting Base”.

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*2 Refer to PIN Code () for more details.

7. DISPLAY

7.1. Handset Display

For Service Hint:

icon will be displayed if the unit took a signal from Telephone Company as a Voice

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Message signal. In that case, press the right button of the Navigator Key for a while.

7.2. Before Requesting Help (Troubleshooting)

If you experience any problems with the normal use of your apparatus, you should unplug it from the telephone outlet and connect a known working telephone in its place. If the known working telephone still has problems, then please contact the customer service department of your Network provider. If it operates correctly, then the problem is likely to be a fault in your apparatus. In this case, contact your supplier for advice. Your Network provider may charge you if they attend a service call that is not due to apparatus supplied by them. Turn the power OFF then ON (Handset) / Disconnect then connect the AC adaptor (Base Unit).

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Cross Reference:

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Power On/Off () Call BAR On/Off (Call Prohibition On/Off) () Key Lock () PIN Code ()

8. OPERATIONS

8.1. Power On/Off

*1 When button is released, the display changes to the standby mode. *2 The display goes blank.

8.2. Making a Call

*1 If you need correction, press CLEAR. Digit is cleared to the left, then enter numbers.

8.3. Answering a Call

- Each ringer will start ringing with lower volume then gradually increase the volume when receiving a call.

*1 You can also answer a call by pressing any dialling button, INTERCOM, , or .

8.4. Setting the Clock/Date

After a mains power failure the clock needs to be reset. Ensure that icon is not flashing.

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- To exit the operation, press any time.

*1 For example, to set 7:15, enter 0715. *2 For example, to set the 16th of February, 2003, enter 160203.

8.5. Phonebook

You can store up to 20 caller information in the phonebook. If you received a call from the same phone number you stored with a name in the phonebook, the display will show the caller’s name.

8.5.1. Storing a Caller Information

- To exit the operation, press any time.

*1 If you need correction, press RIGHT or LEFT to move cursor then clear a character by pressing CLEAR, and/or enter characters. Characters are cleared or added to the left of the flashing

character. To enter characters, see Character Selection below.

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*2 To continue storing another caller information, repeat the steps from 3.

- To exit the operation, press any time.

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*1 If there is no item stored in the phonebook, the display shows . *2 Digits are cleared to the left of the flashing digit. *3 Digits are added to the left of the flashing digit. If you need to clear or add more than one digit, repeat the steps from 4. *4 Characters are added to the left of the flashing character. If you need to clear or add more than one character, repeat the steps from 7. *5 To continue clearing another caller information, repeat the steps from 2.

8.5.2. Storing the Phone Number into the Phonebook When Pre-dialling

- To exit the operation, press any time.

*1 If you need correction, press CLEAR. Digit is cleared to the left, then enter numbers.

8.5.3. Storing the Number from the Redial/Caller List into the Phonebook

- To exit the operation, press any time.

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*1 If there is no item stored in the redial/caller list, the display shows

. *2 If you need correction, press RIGHT or LEFT to move cursor then clear a character by pressing CLEAR, and/or enter digits. Digits are cleared or added to the left of the flashing digit.

8.5.4. Hot Key (: Speed Dial)

You can assign the dialling buttons 1 through 9 as hot keys. You can choose 9 phone numbers from the phonebook.

- To exit the operation, press any time.

*1 If there is no item stored in the phonebook, the display shows . *2 The number is flashing if the dialling button is already assigned as a hot key. *3 Phonebook registration will be remained even hot key registration is cleared.

9. DISASSEMBLY INSTRUCTIONS

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9.1. Base Unit

Shown in Fig.- To Remove Remove

1 Lower Cabinet Screws (2.6 × 12)..........(A) × 2

2 Main P.C. Board Main P.C. Board

9.2. Handset

Shown in Fig.- To Remove Remove

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9.3. Charger Unit

3 Rear Cabinet Screws (2 × 10)..........(B) × 2

4 Rear Cabinet Follow the procedure.

5 Main P.C. Board Screw (2 × 8)..............(C) × 1

Screws (2 × 8).............(D) × 2

Main P.C. Board

Shown in Fig.- To Remove Remove

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6 Lower Cabinet Screws (2.6 × 14)..........(E) × 2

7 Main P.C. Board

Main P.C. Board

10. ASSEMBLY INSTRUCTIONS

10.1. Warning When Constructing the Base Unit

11. TROUBLESHOOTING GUIDE

Flow Chart

Cross Reference:

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Check Power () Bell Reception () Check Battery Charge () Check Link () Check Handset Transmission () Check Handset Reception () SIGNAL ROUTE () TAM Voice Prompt Problems ()

11.1. Check Power

11.1.1. Base Unit

Is the AC Adaptor inserted into AC outlet? (Check AC Adaptor’s specification.)

+ 94 hidden pages

Panasonic KX-TCD420BXM, KX-A142EXM, KX-TCD420BXS, KXA142EXS Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual