Panasonic KX-TCA275CE User manual

© Panasonic Communications Co., Ltd. 2009.
Unauthorized copying and distribution is a violation
of law.
ORDER NO. KMS0909722CE
DECT Portable Station
Model No. KX-TCA275CE
(for Europe)

2
KX-TCA275CE
TABLE OF CONTENTS
PAGE PAGE
1 Safety Precautions -----------------------------------------------4
1.1. For Service Technicians ---------------------------------4
2Warning--------------------------------------------------------------4
2.1. About Lead Free Solder (PbF: Pb free) --------------4
2.1.1. Suggested PbF Solder -------------------------------4
2.1.2. Information for Users on Collection and
Disposal of Old Equipment and used
Batteries -------------------------------------------------5
2.2. Battery Caution ---------------------------------------------5
2.3. Discarding of P. C. Board --------------------------------5
3 Specifications ------------------------------------------------------6
4 Technical Descriptions------------------------------------------7
4.1. Block Diagram (Handset) --------------------------------7
4.2. Circuit Operation (Handset) -----------------------------8
4.2.1. Outline----------------------------------------------------8
4.2.2. Power Supply Circuit/Reset Circuit ---------------8
4.2.3. Charge Circuit (Include Charger)------------------9
4.2.4. Battery Low/Power Down Detector ---------------9
4.2.5. TX Audio Path---------------------------------------- 10
4.2.6. RX Audio Path --------------------------------------- 12
4.2.7. Ringer Circuit ----------------------------------------- 13
4.2.8. Key Click Sound Circuit---------------------------- 13
4.2.9. Vibrator Circuit --------------------------------------- 14
5 Location of Controls and Components------------------ 15
5.1. Handset----------------------------------------------------- 15
6 Installation Instructions--------------------------------------- 17
6.1. Charger Connection ------------------------------------- 17
6.2. Battery ------------------------------------------------------ 17
6.2.1. Battery Installation ---------------------------------- 17
6.2.2. Charging the Battery-------------------------------- 17
6.2.3. Battery Information---------------------------------- 18
6.2.4. Low Battery Warning ------------------------------- 18
6.2.5. Replacing the Batteries ---------------------------- 18
7 Operating Instructions ---------------------------------------- 19
7.1. Soft Keys --------------------------------------------------- 19
7.2. Handset Setting Menu Layout ------------------------ 21
7.3. Key Lock---------------------------------------------------- 22
7.4. Selecting the Display Language---------------------- 22
7.5. DISPLAY --------------------------------------------------- 23
7.6. Function Menus------------------------------------------- 24
7.6.1. Main Menu-While in Standby Mode------------- 24
7.6.2. Sub Menu-While Off-hook/During a
Conversation ----------------------------------------- 24
7.7. Function Keys--------------------------------------------- 25
7.8. Flexible Keys ---------------------------------------------- 26
7.9. Caller ID ---------------------------------------------------- 27
7.10. Character Mode Table ---------------------------------- 28
8 Troubleshooting Guide---------------------------------------- 29
8.1. Power Trouble (Handset) ------------------------------ 30
8.1.1. Power Does Not Go On---------------------------- 30
8.2. Battery Charge Trouble (Handset)------------------- 32
8.2.1. Charge On -------------------------------------------- 32
8.2.2. Charge Off--------------------------------------------- 33
8.3. LED Trouble (Handset) --------------------------------- 34
8.3.1. Key Back-Light --------------------------------------- 34
8.3.2. Charging And Ringing LED ----------------------- 34
8.4. Vibrator Trouble (Handset) ---------------------------- 35
8.5. Ringer Trouble (Handset) ------------------------------ 35
8.6. No Voice Transmission--------------------------------- 36
8.7. No Voice Reception ------------------------------------- 37
8.7.1. Talk Mode --------------------------------------------- 37
8.7.2. Speakerphone Mode ------------------------------- 38
8.8. Password Trouble --------------------------------------- 38
8.8.1. User Password is forgotten.---------------------- 38
8.8.2. System Lock Password is forgotten. ----------- 38
9 Service Fixture & Tools--------------------------------------- 39
10 Disassembly and Assembly Instructions -------------- 40
10.1. Handset ---------------------------------------------------- 40
10.2. Charger Unit ---------------------------------------------- 40
11 Measurements and Adjustments-------------------------- 41
11.1. Check Procedure (Handset) -------------------------- 41
11.1.1. Preparation ------------------------------------------- 41
11.1.2. PC Setting -------------------------------------------- 41
11.1.3. Download Manual----------------------------------- 42
11.2. Adjustments (Handset and Charger Unit) --------- 47
11.2.1. Adjustment (Handset)------------------------------ 47
11.2.2. Adjustment Standard (Handset)----------------- 49
11.2.3. Adjustment (Charger Unit)------------------------ 51
11.2.4. Adjustment Standard (Charger Unit) ----------- 51
11.3. RF Specification (Handset)---------------------------- 51
11.4. How to Check the Handset Speaker---------------- 52
11.5. How to Check the Handset Receiver --------------- 52
11.6. Frequency Table (MHz) -------------------------------- 53
12 Miscellaneous --------------------------------------------------- 54
12.1. How To Replace a Flat Package IC----------------- 54
12.1.1. Preparation ------------------------------------------- 54
12.1.2. Removal Procedure -------------------------------- 54
12.1.3. Procedure--------------------------------------------- 54
12.1.4. Removing Solder From Between Pins--------- 54
12.2. Terminal Guide of the ICs Transistors and
Diodes ------------------------------------------------------ 55
12.2.1. Handset ----------------------------------------------- 55
12.2.2. Charger Unit------------------------------------------ 55
13 Schematic Diagram -------------------------------------------- 56
13.1. Handset ---------------------------------------------------- 56
13.2. Handset (RF Unit) --------------------------------------- 58
13.3. Charger Unit ---------------------------------------------- 59
14 Printed Circuit Board------------------------------------------ 60
14.1. Handset ---------------------------------------------------- 60
14.1.1. Component View------------------------------------ 60
14.1.2. Flow Solder Side View----------------------------- 61
14.2. Charger Unit ---------------------------------------------- 62
14.2.1. Component View------------------------------------ 62
14.2.2. Flow Solder Side View----------------------------- 62
15 Appendix Information of Schematic Diagram -------- 62
16 Exploded View and Replacement Parts List----------- 63
16.1. CPU Data (Handset) ------------------------------------ 63
16.1.1. IC3 (BBIC) -------------------------------------------- 63
16.2. Cabinet and electrical Parts Location--------------- 65
16.2.1. Handset ----------------------------------------------- 65
16.2.2. Charger Unit------------------------------------------ 66
16.2.3. Accessories and Packing Materials ------------ 67
16.3. Replacement Parts List -------------------------------- 68
16.3.1. Cabinet and Electrical Parts (Handset)-------- 68
16.3.2. Cabinet and Electrical Parts (Charger unit) -- 68
16.3.3. Accessories and Packing Materials ------------ 68

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KX-TCA275CE
16.3.4. Handset Board Parts----------------------------- --69
16.3.5. Charger unit Board Parts ----------------------- --71
16.3.6. Fixtures and Tools -------------------------------- --71

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KX-TCA275CE
1 Safety Precautions
1.1. For Service Technicians
• 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.
2Warning
2.1. 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 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.
Caution
• 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, ( 6 0 0°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).
2.1.1. 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.

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KX-TCA275CE
2.1.2. Information for Users on Collection and Disposal of Old Equipment and used Bat-
teries
2.2. Battery Caution
1. Danger of explosion if battery is incorrectly replaced.
2. Replace only with the same or equivalent type recommended by the manufacturer.
3. Dispose of used batteries according to the manufacture's Instructions.
2.3. Discarding of P. C. Board
When discarding P. C. Board, delete all personal information such as telephone directory and caller list or scrap P. C. Board.

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KX-TCA275CE
3 Specifications
Handset Charger Unit
Standard: DECT= (Digital Enhanced Cordless Telecommunications)
GAP= (Generic Access Profile)
Power Source: Rechargeable Ni-MH battery AC Adaptor
Number of Channels: 120 Duplex Channels
Frequency Range: 1.88GHz to 1.9GHz
Duplex Procedure: TDMA (Time Division Multiple Access)
Battery Life, Handset (if batteries are fully charged): Stand-by: Up to 200 hours (Ni-MH)
Talk: Up to 15 hours (Ni-MH)
Channel Spacing: 1728kHz
Bit rate Spacing: 1152kbit/s
Operating Conditions: 5~40 °C, 20~80% relative air humidity (dry)
Modulation: GFSK= (Gaussian Frequency Shift Keying)
RF Transmission Power: approx. 250mW
Voice Coding: ADPCM 32 kbit/s
Operation Range: Up to 300 m outdoors, Up to 50 m indoors
Dimensions (D x W x L): 123 mm x 45 mm x 23 mm 78 mm x 78 mm x 59 mm
Weight: approx. 120g approx. 108g

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KX-TCA275CE
4 Technical Descriptions
4.1. Block Diagram (Handset)
KX-TCA275CE BLOCK DIAGRAM (HANDSET)
RFmodule
(DECT)
RF 3.0V
Batt
AFE DSP
MIDI
Receiving
Calls
Making
Calls
D/A
A/D
RF I/F
Decoder
Encoder
BMC
1.8V
ACS0
16
16
16
3.0V
3.0V
3.0V
Flash
(32Mbit)
SRAM
(2Mbit)
Color
LCD
ACS1
ACS2
16
CR16C
3.0V
Peripheral
Backlit 5.0V
PWM
BBIC (SC14428F)
Power
Management
Batt
Keys
Xtal
10.368MH
UART
JTAG
Charger
Circuit
Charge Current
Charge on/off
Battery
3.6V
Batt
Regulator
RF 3.0V
5.0V
Regulator
3.0V
1.8V
Batt
3.0V
Batt
Tr Batt
Vib
3.0V
LED(G)
LED(R)
LED(YG) Tr
Tr
Tr
Charge LED
Key backlit
OP-Amp
H
/
S
J
a
c
k
Mic Bias
Rear
Speaker
Receiver
Mic
H/S
detect
A
nt

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KX-TCA275CE
4.2. Circuit Operation (Handset)
4.2.1. Outline
Handset consists of the following ICs as shown in Block Diagram (Handset) (P. 7 ).
• BBIC (Base Band IC): IC3
- All data signals (forming/analyzing ACK or CMD signal)
- All interfaces (ex: Key, Detector Circuit, Charge, LCD, LED, SRAM, Flash ROM)
•SRAM:IC1
- Application data and code are temporarily stored.
• Flash ROM (substitute EEPROM): IC2
- Source program data and temporary user data are stored.
• AMPLIFIER IC: IC5
- Single OP_AMP for SPEAKER
• RF Module:
- PLL Oscillator
- Detector
- Compress/Expander
- Amplifier for reception
- Amplifier for transmission
4.2.2. Power Supply Circuit/Reset Circuit
When power on the Handset, the voltage is as follows;
BATTERY(3.5 V to 4.2V: Battery+) →Q8 (1.8V) →Q10 (3.0V)
The reset signal is generated with IC3 and Q17.
Power for RF IC (IC601) is generated with IC603.
5.0V for LCD back-light is generated with IC4.
Battery (3.5V to 4.2V) is used for RF Module, Amplifier IC (IC5), Vibrator, DC/DC Converter (IC4).
1.8V is used only for BBIC (IC3).
3.0V is used for BBIC (IC3), LCD, SRAM (IC1), Flash ROM (IC2), Red LED, Green LED, Key back-light.

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KX-TCA275CE
4.2.3. Charge Circuit (Include Charger)
• Charge current is controlled as follows.
• Charge mode is trickle charge.
• Charge current repeats ON and OFF as follows.
• Charge route
DC+ (6.5V) →IP1 →D1 →R2, R3, R4 and R5 →CHG+ (Charger) →CHG+ (Handset) →L2 →Q2 →D13 →IP101 →Battery
→GND →R5 →CHG- (Handset) →CHG- (Charger) →GND
4.2.4. Battery Low/Power Down Detector
"Battery Low" and "Power Down" are detected by BBIC (IC3) which checks the battery voltage.
The detected voltage is as follows;
• Battery Low
Battery voltage: V(Batt) 3.5V ± 50mV
The BBIC detects this level and " " starts flashing.
• Power Down
Battery voltage: V(Batt) 3.3V ± 50mV
The BBIC detects this level and power down.
IC3-97pin Q4 Q3 Q2
Charge ON Low OFF ON ON
Charge Off High ON OFF OFF

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KX-TCA275CE
4.2.5. TX Audio Path
Microphone
An audio signal from microphone is input to pin 118 (MIC+) of IC3 via headset jack (CN1).
In IC3, the audio signal is converted from the analog signal to ADPCM, then to burst data, and sent from pin 28 (TXDA) to RF
Module. The stabilized supply voltage is fed to the microphone from pin 119 (VREF+) of IC3.
To reduce consumption current, this voltage is supplied only while calling or receiving.
Headset
When a headset is inserted, a signal from microphone is cut off and an audio signal from a headset is input to pin 118 (MIC+).
Headset detection
When a headset is inserted, pin 41 (ADC2) of IC3 goes from Low to High (around 1V) and BBIC (IC3) detects the insertion of
the headset.

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KX-TCA275CE
• LCD Circuit
• The LCD is controlled by 5 control signal (READ, WRT, A0, LCD_CS, LCD_RST) and Data bus.
• LCD back-light is controlled by IC3-79pin, and this PWM signal controls back-light brightness.

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KX-TCA275CE
4.2.6. RX Audio Path
Receiver
Burst data is input from RF Module to pin 26 (RXDA) of IC3.
In IC3, the burst data is converted to ADPCM, then to analog signal, and sent from pin 110 (LSR+) and pin 111 (LSR-) to the
receiver.
Headset
When the headset is inserted, a signal to the receiver is cut off and audio signal from pin 110 (LSR+) of IC3 is input to the head-
set.
Speakerphone
In Speakerphone mode, the BBIC (IC3) makes pin 1 of IC5 from Low to High.
And an audio signal from pin 112 (LSR_HS) of IC3 is sent to a monitor speaker through speaker Amplifier IC (IC5).

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KX-TCA275CE
• LED Circuit
BBIC (IC3) controls each LEDs.
4.2.7. Ringer Circuit
During ringing, a signal is sent from pin 112 of IC3 to a monitor speaker through speaker Amplifier IC (IC5). At this time, BBIC
(IC3) makes pin 1 of IC5 from low to high.
4.2.8. Key Click Sound Circuit
When the key is pushed, a signal is sent from pin 12 of IC3 to a monitor speaker through speaker Amplifier IC (IC5). At this
time, BBIC (IC3) makes pin 1 of IC5 from low to high.
Type of LED LED ON LED OFF
Call/Charge Indicator LED (Green), D1 IC3-81pin = High
Q6 = ON
IC3-81pin = Low
Q6 = OFF
Call/Charge Indicator LED (Red), D1 IC3-80pin = High
Q7 = ON
IC3-80pin = Low
Q7 = OFF
Key back-light LEDs (Yellow)
D3-D10, D17-D26
IC3-42pin = High
Q12 = ON
IC3-42pin = Low
Q12 = OFF

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KX-TCA275CE
4.2.9. Vibrator Circuit
BBIC (IC3) controls Vibrator.
Pin 83 (VIB) of IC3 goes high and Vibrator turns ON.

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KX-TCA275CE
5 Location of Controls and Components
5.1. Handset

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KX-TCA275CE

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KX-TCA275CE
6 Installation Instructions
6.1. Charger Connection
Connect the AC adaptor to the charger.
• The AC adaptor should be connected to a vertically oriented or floor-mounted AC outlet.
Do not connect the AC adaptor to a ceiling-mounted AC outlet, as the weight of the
adaptor may cause it to become disconnected.
• Fasten the AC adaptor cord to the cord holder.
• Use only the included Panasonic AC adaptor (PQLV219CE).
6.2. Battery
6.2.1. Battery Installation
Insert the batteries, and close the cover as indicated below.
6.2.2. Charging the Battery
At the time of shipment, the battery is not charged.
Please charge the battery for about 5.5 hours before using the handset for the first time.
• When the battery has been completely charged, the charge indicator will change from red to green.
• It is normal for the handset and charger to feel warm while the battery is charging.
• Keep devices sensitive to magnetic fields away from the charger.
• Use only the included charger.

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KX-TCA275CE
6.2.3. Battery Information
After your Panasonic battery is fully charged [at 25°C]:
• Operating time may be shorter than listed above depending on usage conditions and ambient temperature.
• The battery will drain slowly even while the handset is turned off.
• The handset can receive calls while charging.
• Battery consumption increases when the handset is used out of range. If " " flashes, turn the handset off.
6.2.4. Low Battery Warning
The battery needs to be charged in the following situations:
• “ “ flashes, and the alarm sounds*1.
• "Charge Battery" is displayed. In this situation, the handset cannot be operated.
*1 If the low battery warning occurs during a conversation, the call will be automatically disconnected one minute after the alarm
sounds.
6.2.5. Replacing the Batteries
If " "flashes after using the phone for a short time, even when the battery has been fully charged, the battery should be
replaced.
Before replacing the battery, make sure the low battery warning is displayed, then turn off the power to prevent memory loss.
Replace the battery and charge the new battery for about 5.5 hours.
If you replace the battery before the low battery warnings appears, the battery strength icon may display an incorrect reading. In
this case, use the handset as normal with the new battery installed. When the low battery warning is displayed, charge the bat-
tery for about 5.5 hours. The battery strength icon will then display the correct reading.
1. Turn the power off to prevent memory loss.
2. Press the notch on the cover firmly and slide it as indicated by the arrow (A).
3. Open the cover and replace the batteries.
• Insert a finger into the side gap to remove the batteries easily (B).
4. Close the cover and charge the handset.
• Please use a Panasonic battery with the service part number HHR-4EPT only.
Operation Operating Time
While in use (Talk) Up to about 15 h
While not in use (Standby) Up to about 200 h

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KX-TCA275CE
7 Operating Instructions
7.1. Soft Keys

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KX-TCA275CE