Panasonic KX-TCD420GS User manual

ORDER NO. KM40306116C2
Telephone Equipment
KX-TCD420GS / KX-A142EXS
Digital Cordless Answering System
Silver Version
(for Germany)
SPECIFICATIONS
1

Telephone Equipment 1
1. ABOUT LEAD FREE SOLDER (PbF: Pb free) 2
1.1. Suggested PbF Solder 3
1.2. How to recognize that Pb Free solder is used 3
1.2.1. Base Unit PCB 3
1.2.2. Handset PCB 4
1.2.3. Charger Unit PCB 4
2. FOR SERVICE TECHNICIANS 4
3. CAUTION 4
4. BATTERY 4
4.1. Battery Installation 4
4.2. Battery Charge 5
4.3. Battery Life 5
4.4. Replacing the Batteries 6
5. LOCATION OF CONTROLS 6
5.1. Base Unit 7
5.2. Handset 7
6. SETTINGS 7
6.1. Connection 7
6.1.1. Base Unit 7
6.1.2. Charger Unit 8
6.2. Symbols Used in This Service Manual 8
6.3. PIN Code 9
6.3.1. Base Unit 9
6.3.2. Handset 9
6.3.3. Reset Base Unit PIN to Default (0000) -When There is NO Handset Registered- 10
6.3.3.1. Symptom 10
6.3.3.2. Thinkable Situation 10
6.3.3.3. Remedy 10
6.4. Reset 11
6.4.1. Base Unit 11
6.4.2. Handset 12
6.5. Key Lock 13
6.6. Recall Feature 13
6.7. Dialling Pause for PBX line/long distance service users 14
6.8. Call Restriction 14
6.9. Cancelling Call Restricted Handset(s) 15
6.10. Call BAR On/Off (Call Prohibition On/Off) 15
6.11. Selecting the Display Language 16
6.12. Select Flash/Earth Mode 16
6.13. Automatic Route Selection 17
6.13.1. Storing the Carrier Code(s) 17
6.13.2. Storing the Area Code(s) 18
6.13.3. Relate the Area Code(s) to the Carrier Code(s) 18
6.13.4. Automatic Route Selection On/Off 19
6.14. Summary of Programmable Functions 19
7. DISPLAY 20
7.1. Handset Display 20
7.2. Before Requesting Help (Troubleshooting) 20
8. OPERATIONS 22
8.1. Power On/Off 22
svcdoc
I

8.2. Making a Call 22
8.3. Answering a Call 22
8.4. Setting the Clock/Date 23
8.5. Phonebook 23
8.5.1. Storing a Caller Information 23
8.5.2. Storing the Phone Number into the Phonebook When Pre-dialling 25
8.5.3. Storing the Number from the Redial/Caller List into the Phonebook 26
8.5.4. Hot Key (: Speed Dial) 26
9. DISASSEMBLY INSTRUCTIONS 27
9.1. Base Unit 27
9.2. Handset 28
9.3. Charger Unit 29
10. ASSEMBLY INSTRUCTIONS 30
10.1. Warning When Constructing the Base Unit 30
11. TROUBLESHOOTING GUIDE 30
11.1. Check Power 31
11.1.1. Base Unit 31
11.1.2. Handset 32
11.2. Check Battery Charge 32
11.2.1. Base Unit 32
11.2.2. Handset 33
11.2.3. Charger Unit 33
11.3. Check Link 33
11.3.1. Base Unit 33
11.3.2. Handset 34
11.4. Check Handset Transmission 35
11.5. Check Handset Reception 35
11.6. Check Caller ID 35
11.7. TAM Voice Prompt Problems 35
11.8. Bell Reception 36
11.8.1. Base Unit 36
11.8.2. Handset 36
12. CHECK PROCEDURE (BASE UNIT) 37
12.1. Preparation 37
12.1.1. Equipment Required 37
12.1.2. JIGs and PC 37
12.2. PC Setting 37
12.2.1. Connections 37
12.2.2. PC Setting 37
12.3. TAM Voice Prompt Download 38
13. CHECK PROCEDURE (HANDSET) 38
13.1. Preparation 38
13.1.1. Equipment Required 38
13.1.2. JIGs and PC 39
13.2. PC Setting 39
13.2.1. Connections 39
13.2.2. PC Setting 39
14. ADJUSTMENTS (BASE UNIT AND CHARGER UNIT) 40
14.1. Adjustment (Base Unit) 40
14.2. Adjustment Standard (Base Unit) 47
14.2.1. Component View 47
svcdoc
II

14.2.2. Flow Solder Side View 48
14.3. Adjustment (Charger Unit) 48
14.4. Adjustment Standard (Charger Unit) 48
14.4.1. Flow Solder Side View 48
15. ADJUSTMENTS (HANDSET) 48
15.1. Adjustment 49
15.2. Adjustment Standard (Handset) 54
16. RF SPECIFICATION 54
16.1. Base Unit 54
16.2. Handset 54
17. HOW TO CHECK THE HANDSET SPEAKER 54
18. FREQUENCY TABLE (MHz) 56
19. BLOCK DIAGRAM (BASE UNIT) 57
20. CIRCUIT OPERATION (BASE UNIT) 57
20.1. Outline 57
20.2. Power Supply Circuit 58
20.3. Telephone Line Interface 59
20.4. Transmitter/Receiver 60
20.4.1. Transmitter Block 60
20.4.2. Receiver Block 60
21. BLOCK DIAGRAM (HANDSET) 60
22. CIRCUIT OPERATION (HANDSET) 60
22.1. Outline 60
22.2. Power Supply Circuit/Reset Circuit 61
22.3. Charge Circuit 61
22.4. Battery Low/Power Down Detector 61
23. CIRCUIT OPERATION (CHARGER UNIT) 62
23.1. Power Supply Circuit 62
24. SIGNAL ROUTE 62
25. CPU DATA (BASE UNIT) 63
25.1. IC8 (BBIC) 63
26. CPU DATA (HANDSET) 68
26.1. IC1 (BBIC) 69
27. EEPROM LAYOUT (BASE UNIT) 71
27.1. Scope 71
27.2. Introduction 71
27.3. EEPROM Layout 72
27.3.1. General Setup 72
27.3.2. Switch Control 72
27.3.3. Flash Time setting 73
27.3.4. Clip (Caller ID) configuration 73
27.3.5. TADTASK 74
27.3.6. BsUiTask settings 77
28. EEPROM LAYOUT (HANDSET) 77
28.1. Scope 77
28.2. Introduction 78
28.3. EEPROM contents 78
28.3.1. General Setup 78
28.3.2. Signal detection (for factory use only) 78
28.3.3. Battery Parameters 80
28.3.4. Default Audio-Parameters 80
svcdoc
III

28.3.5. VolumeSetting Second Block 81
29. HOW TO REPLACE FLAT PACKAGE IC 81
29.1. Preparation 81
29.2. Procedure 82
29.3. Modification Procedure of Bridge 82
30. CABINET AND ELECTRICAL PARTS LOCATION (BASE UNIT) 83
31. CABINET AND ELECTRICAL PARTS LOCATION (HANDSET) 84
32. CABINET AND ELECTRICAL PARTS LOCATION (CHARGER UNIT) 85
33. ACCESSORIES AND PACKING MATERIALS 86
33.1. KX-TCD420GS 87
33.2. KX-A142EXS 87
34. TERMINAL GUIDE OF THE ICs, TRANSISTORS AND DIODES 88
34.1. Base Unit 88
34.2. Handset 89
34.3. Charger Unit 89
35. REPLACEMENT PARTS LIST 89
35.1. Base Unit 90
35.1.1. Cabinet and Electrical Parts 90
35.1.2. Main P.C.Board Parts 91
35.2. Handset 95
35.2.1. Cabinet and Electrical Parts 95
35.2.2. Main P.C.Board Parts 96
35.3. Charger Unit 97
35.3.1. Cabinet and Electrical Parts 97
35.3.2. Main P.C.Board Parts 98
35.4. Accessories and Packing Materials 98
35.4.1. KX-TC420GS 98
35.4.2. KX-A142EXS 98
35.5. Fixtures and Tools 98
35.6. Memo 99
36. SCHEMATIC DIAGRAM (BASE UNIT) 99
37. SCHEMATIC DIAGRAM (HANDSET) 99
38. SCHEMATIC DIAGRAM (CHARGER UNIT) 99
39. CIRCUIT BOARD (BASE UNIT) 99
39.1. Component View 99
39.2. Flow Solder Side View 99
40. CIRCUIT BOARD (HANDSET) 99
40.1. Component View 99
40.2. Flow Solder Side View 99
41. CIRCUIT BOARD (CHARGER UNIT) 99
41.1. Component View 99
41.2. Flow Solder Side View 99
svcdoc
IV

2003 Panasonic Communications Co., Ltd. All rights reserved.
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
2

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 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)
(Flow Solder Side View)
3

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.
4

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
using fully charged Ni-MH batteries (700 mAh):
Talk time: 10hrs approx.
Standby time: 120hrs approx.
5

- 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.
- 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.
6

5. LOCATION OF CONTROLS
5.1. Base Unit
5.2. Handset
6. SETTINGS
6.1. Connection
6.1.1. Base Unit
Plug in the AC adaptor and the telephone line cord in order 1, 2, 3, 4.
7

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.
6.1.2. Charger Unit
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
8

6.3. PIN Code
6.3.1. Base Unit
- To exit the operation, press any time.
For Service Hint:
* : If the current 4-digit PIN is forgotten, press and you
will be able to enter new PIN.
6.3.2. Handset
9

- To exit the operation, press any time.
For Service Hint:
* : If the current 4-digit PIN is forgotten, press and 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 ().
<Connection>
1. Solder a pin or lead wire to GND, SDA, and SCLK on base PCB.
10

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.
<PC setting and how to reset base PIN to default (0000)>
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.
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
11

Function Initial Setting Remarks (selectable options
Ringer Mode All Handsets All Handsets/Specific Handset
N
Number of Rings 3Up to 6 rings
Flash/Earth Flash -
Flash Timing 200 msec 80/200 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 8 digit
s
4-Digit Base Unit PIN 0000 -
ARS Setting OFF ON/OFF
Carrier Code All Clear -
Area Code All Clear -
Relation of Area Code All Area Code to Carrier Code 1 1 to 5
6.4.2. Handset
You can reset all of the handset settings to their initial settings.
- To exit the operation, press any time.
- *1: The factory preset is 0000.
Handset Initial Settings
12

Function Initial Setting Remarks (selectable options
Time Alarm Mode OFF OFF/ON
Alarm Time Clear OFF/Once/Daily
Handset Ringer Volume 6 -
Handset External Ringer Pattern 120 patterns
Handset Internal Ringer Pattern 120 patterns
Handset Paging Tone Pattern 120 patterns
Handset Alarm Tone Pattern 120 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./Handset N
o
Talk Mode Display Length of the Call Talk Time/Phone No.
Display Language German 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 No.
Redial Memory All Clear -
Handset Receiver Volume Medium Low/Medium/High
6.5. Key Lock
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
13

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.
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.
14

- 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.
- *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.
15

- 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.
- *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. Select Flash/Earth Mode
An earth relay can be installed as an option depending on your PBX requirements. Please consult our
16