Panasonic KX-TDA0103XJ, KX-TDA0104XJ, KX-TDA0108XJ, KX-TDA0103X, KX-TDA0108X Service Manual

1 SUBJECT 3

1.1. The Classification of Product

3

1.2. The Classification of Service Manual

3

2 ABOUT LEAD FREE SOLDER (PbF: Pb free)

4

2.1. SUGGESTED PbF SOLDER

4

3 FOR SERVICE TECHNICIANS

5

4 CAUTION

5

4.1. NOTE

5

4.2. SAFETY PRECAUTIONS

5

4.3. INSULATION RESISTANCE TEST

5

4.4. CAUTION

5

5 SPECIFICATIONS

6

5.1. GENERAL DESCRIPTION

6

5.2. SYSTEM CAPACITY

7

6 INSTALLATION

8

6.1. INSTALLING/REPLACING THE POWER SUPPLY UNIT

8

7 DISASSEMBLY INSTRUCTIONS

11

7.1. PSU-S (KX-TDA0108XJ/X)

11

© 2006 Panasonic Communications Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.

KX-TDA0103XJ
KX-TDA0104XJ
KX-TDA0108XJ
KX-TDA0103X
KX-TDA0104X
KX-TDA0108X

(for Asia, Oceania, Middle Near East, Africa, Latin

America and Europe)

7.2. PSU-M (KX-TDA0104XJ/X) 12

7.3. PSU-L (KX-TDA0103XJ/X)

13

8 POWER SUPPLY UNIT CIRCUIT OPERATION

15

8.1. PSU-S (KX-TDA0108XJ/X)

16

8.2. PSU-M (KX-TDA0104XJ/X)

30

8.3. PSU-L (KX-TDA0103XJ/X)

45

9 TROUBLESHOOTING GUIDE

61

9.1. KX-TDA0108XJ/X POWER UNIT TROUBLESHOOTING

61

9.2. KX-TDA0104XJ/X POWER UNIT TROUBLESHOOTING

74

9.3. KX-TDA0103XJ/X POWER UNIT TROUBLESHOOTING

90

10 HOW TO REPLACE A FLAT PACKAGE IC

106

10.1. PREPARATION

106

10.2. PROCEDURE

106

10.3. REMOVING SOLDER FROM BETWEEN PINS

106

11 CABINET AND ELECTRICAL PARTS LOCATION

107

11.1. PSU-S (KX-TDA0108XJ/X)

107

11.2. PSU-M (KX-TDA0104XJ/X)

108

Power Supply Unit

Please file and use this supplement manual together with the service manual for Model No. KX­TDA0103XJ/KX-TDA0104XJ/KX-TDA0108XJ/KX-TDA0103X/KX-TD A0104X/KX-TDA0108X Order No.
KMS0303680C8.

CONTENTS

Page Page

ORDER NO. KMS0612695SE

11.3. PSU-L (KX-TDA0103XJ/X) 109

11.4. SCREWS AND WASHER

110

11.5. EXTENSION CORD FOR SERVICING

111

12 ACCESSORIES AND PACKING MATERIALS

112

12.1. PSU-S (KX-TDA0108XJ/X)

112

12.2. PSU-M (KX-TDA0104XJ/X)

113

12.3. PSU-L (KX-TDA0103XJ/X)

114

13 REPLACEMENT PARTS LIST

115

13.1. KX-TDA0108XJ/X

115

13.2. KX-TDA0104XJ/X

120

13.3. KX-TDA0103XJ/X

125

13.4. FIXTURES AND TOOLS

131

14 FOR THE SCHEMATIC DIAGRAM

132

15 SCHEMATIC DIAGRAM / S-TYPE POWER SUPPLY UNIT (PSU-

S) / KX-TDA0108XJ/X

134

15.1. SUB BOARD

134

15.2. MAIN BOARD

136

15.3. WAVEFORM (PSU-S) / KX-TDA0108XJ/X

139

16 SCHEMATIC DIAGRAM / M-TYPE POWER SUPPLY UNIT

(PSU-M) / KX-TDA0104XJ/X

142

16.1. MAIN BOARD

142

16.2. SUB BOARD 3

144

16.3. SUB BOARD 2

146

16.4. SUB BOARD 1

148

16.5. WAVEFORM (PSU-M) / KX-TDA0104XJ/X

149

17 SCHEMATIC DIAGRAM / L-TYPE POWER SU PPLY UNIT (PSU-

L) / KX-TDA0103XJ/X

152

17.1. MAIN BOARD

152

17.2. SUB BOARD 4

154

17.3. SUB BOARD 3

155

17.4. SUB BOARD 2

156

17.5. SUB BOARD 1

157

17.6. WAVEFORM (PSU-L) / KX-TDA0103XJ/X

158

18 PRINTED CIRCUIT BOARD

160

18.1. S-TYPE POWER SUPPLY UNIT (PSU-S) / KX­TDA0108XJ/X

160

18.2. M-TYPE POWER SUPPLY UNIT (PSU-M) / KX­TDA0104XJ/X

163

18.3. L-TYPE POWER SUPPLY UNIT (PSU-L) / KX­TDA0103XJ/X

170

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KX-TDA0103XJ / KX-TDA0104XJ / K X-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

1 SUBJECT

The power supply unit is to be changed to RoHS-compliant.
Complete contents of the service manual will be revised in accordance with the change.

1.1. The Classification of Product

The product should be classified by the "Model No." displayed on the name plates of the power supply unit.

Model No. Model No. on Name plate

Before change After change

KX-TDA0103XJ

KX-TDA0103X

PSLP1208 PSLP1432

KX-TDA0104XJ

KX-TDA0104X

PSLP1207 PSLP1433

KX-TDA0108XJ

KX-TDA0108X

PSLP1206 PSLP1453

1.2. The Classification of Service Manual

This supplement is issued for the original service manual of modified power supply unit.

Model No. Original Service Manual Order No.

Before change After change

KX-TDA0103XJ

KX-TDA0103X

KMS0303680C8 KMS0612695SE

(Supplement-3)

KX-TDA0104XJ

KX-TDA0104X

KX-TDA0108XJ

KX-TDA0108X

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

2 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.

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).

•

• •

• 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).

2.1. 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
manufacturer’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-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

3 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.

4 CAUTION

4.1. NOTE

When you note the serial number, write down all of the 11 digits.
The serial number may be found on the label affixed to the front of the unit.

4.2. SAFETY PRECAUTIONS

Refer to Service Manual for KX-TDA100, KX-TDA200 and KX-TDA600.

4.3. INSULATION RESISTANCE TEST

1. Unplug the power cord and short the two prongs of the plug with a jumper wire.

2. Turn on the power switch.

3. Measure the resistance value with ohmmeter between the jumpered AC plug and earth terminal.

4. If the measurement is outside the specified limits, there is a possibility of shock hazard. The equipment should be repaired and
rechecked before it is returned to the customer.

4.4. CAUTION

The power socket wall outlet should be located near this equipment and be easily accessible.

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

5 SPECIFICATIONS

5.1. GENERAL DESCRIPTION

KX-TDA0108XJ/X (PSLP1453)

Input voltage AC100-130V/AC200-240V

current 1.4A/0.8A
frequency 50/60Hz

Output ch. +15V +15VPT +30V +41V

voltage 15V 15V 30V 41V
current (rated) 1.86A 1.92A 0.37A 1.13A
total output power 74 W

KX-TDA0104XJ/X (PSLP1433)

Input voltage AC100-130V/AC200-240V

current 2.5A/1.4A
frequency 50/60Hz

Output ch. +15V +15VPT +30V +40V

voltage 15V 15V 30V 41V
current (rated) 3.20A 3.84A 0.73A 2.4A
total output power 140.4 W

KX-TDA0103XJ/X (PSLP1432)

Input voltage AC100-130V/AC200-240V

current 5.1A/2.55A
frequency 50/60Hz

Output ch. +15V +15VPT +30V +41V

voltage 15V 15V 30V 41V
current (rated) 3.20A 15.4A 0.73A 4.50A
total output power 279 W

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

5.2. SYSTEM CAPACITY

5.2.1. Power Supply Unit Selection

Hybrid IP-PBX needs an optional power supply unit (PSU) suitable for its configuration. Calculate the amount of "load figures"
from the type and number of equipment to be connected, and determine the type of PSU that will be required.

Load Figure Calculation

Equipment Type Load Figure

PT DPT (T76xx series and T7560, T7565) 1

Other DPT/APT/DSS Console 4

Extension Card *1 DHLC8 8

SLC8 8
SLC16 16
MSLC16 16

CS 4

ISDN Extension 2

Voice Mail 1

*1 Only the extension cards that can support SLTs count for the load figures.

PSU Capability

Each PSU supports a different amount of load figures.

PSU Type Maximum Load Figures Available
PSU-S (KX-TDA0108XJ/X) 64 Available for the KX-TDA100
PSU-M (KX-TDA0104XJ/X) 128 Available for the KX-TDA100, KX-TDA200 and KX-TDA600
PSU-L (KX-TDA0103XJ/X) 512 Available for the KX-TDA200 and KX-TDA600

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

6 INSTALLATION

6.1. INSTALLING/REPLACING THE POWER SUPPLY UNIT

6.1.1. Function

PSU Type Lower/Upper Input Voltage Range Current Input Frequency

PSU-S

(for KX-TDA100)

Lower: 100 V AC to 130 V AC 1.4 A 50 Hz or 60 Hz
Upper: 200 V AC to 240 V AC 0.8 A

PSU-M

(for KX-TDA100/200/600)

Lower: 100 V AC to 130 V AC 2.5 A
Upper: 200 V AC to 240 V AC 1.4 A

PSU-L

(for KX-TDA200/600)

Lower: 100 V AC to 130 V AC 5.1 A
Upper: 200 V AC to 240 V AC 2.55 A

Accessory and User-supplied Items

Accessory (included): screws x 4
User-supplied (not included): earthing wire, Back-up Battery Cable (KX-A228 for PSU-S and PSU-M, or KX-A229 for PSU-L)

Note:

•

• •

• For details about frame earth connection, refer to "Installation Manual".

•

• •

• For details about backup batteries connection, refer to "Installation Manual".

Safety Instructions

Each PSU complies with Safety Class 1 of IEC60950, EN60950, UL60950, CAN/CSA-C22.2 No.60950, and AS/NZS60950;
therefore a protective earth connection exists between the mains outlet ground and the PSU case. To ensure the PBX chassis
is safely grounded, it is essential that the PSU case be securely fastened to the PBX chassis with the 4 screws provided with
each PSU.

When installing or replacing PSU, basic safety precautions should always be followed to reduce the risk of fire, electric shock
and injury to persons, including the following:

1. Never install or replace PSU during a lightning storm.

2. Never install or replace PSU in wet locations.

3. Never install or replace PSU unless the AC supply and backup battery supply are disconnected.

4. To protect the back board from static electricity, do not touch parts on the back board in the main unit and PSU. To
discharge static, touch ground or wear an earthing strap.

Do not replace or remove the PSU for any other purpose.

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

6.1.2. Installing the Power Supply Unit

1. Insert the PSU along the guide rails.

Caution:

For safety reasons, do not touch parts in the PSU.

2. Push the release lever in the direction of the arrow, so that the PSU is made to engage with the connector on the back board
securely.

3. Turn the 4 screws clockwise, in the order indicated by the numbers 1 to 4, to fix the PSU.

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

6.1.3. Replacing the Power Supply Unit

1. Unplug the AC power cord and Back-up Battery Cable.

2. Turn the 4 screws anticlockwise to loosen them.

3. Pull the release lever in the direction of the arrow to disconnect the PSU from the back board.

4. Replace the PSU.

5. Follow the steps in "Installing the Power Supply Unit".

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

7 DISASSEMBLY INSTRUCTIONS

7.1. PSU-S (KX-TDA0108XJ/X)

1. Remove the eight screws (A).

2. Remove the screw (B).

3. Remove the chassis cover.

1. Remove the eight screws (F).

2. Remove the two screws (B).

3. Remove the angle.

4. Remove the screw (E).

5. Remove the main board.

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

7.2. PSU-M (KX-TDA0104XJ/X)

1. Remove the seven screws (A) ( 3 × 6 mm).

2. Remove the screw (G) (

3 × 4 mm).

Caution:

When putting the screw again, use the screw (G).

3. Remove the three screws (B).

4. Pull out the three connectors.

5. Remove the angle.

6. Separate the chassis body and chassis cover.

1. Remove the seven screws (F).

2. Remove the screw (E).

3. Remove the sub board 3.

1. Remove the eight screws (F).

2. Remove the main board.

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

7.3. PSU-L (KX-TDA0103XJ/X)

1. Remove the two screws (A).

2. Remove the cover.

3. Pull out the connector.

1. Remove the eight screws (A).

2. Remove the three screws (B).

3. Pull out the four connectors.

4. Remove the angle.

5. Separate the chassis body and chassis cover.

(Sub Board 4)

1. Remove the sub board 4.
(Sub Board 3)

1. Remove the seven screws (F).

2. Remove the screw (E).

3. Remove the sub board 3.

13

KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

1. Remove the eight screws (F).

2. Remove the main board.

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

8 POWER SUPPLY UNIT CIRCUIT OPERATION

The power unit supplies power to the various cards of the KX-TDA100, KX-TDA200 and KX-TDA600.
The functions of the power unit are listed below.

Function Description

DC voltage generation f unction This function generates four DC voltages (+40V, +30V, +15VPT, and +15V) from the AC power supply and

supplies them to the system.
AC cutoff detection function This function detects any cutoff of AC power supply and outputs an AC alarm signal to the MPR card.
DC abnormality detection function This function detects any abnormality in the DC voltage and outputs a DC alarm signal to the MPR card.
Overheating detection function This function detects any overheating of the power unit and shuts down the power supply in order to

preserve the safety of the system.

Two kinds of power supply unit are provided as an option depending on the card structure and the terminal structure for KX­TDA100, KX-TDA200 and KX-TDA600.

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

8.1. PSU-S (KX-TDA0108XJ/X)

This power supply unit consists of two boards.

8.1.1. Block Diagram and Circuit Description of PSU-S

[Block Diagram of PSU-S]

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

8.1.1.1. AC Input ~ PFC Output

This section explains about the operations of AC filter circuit, Rectifier circuit and PFC circuit.

1) Filter Circuit, Rectifier Circuit 1

The filter part eliminates the noise from power supply unit not to leak it out, and also the circuit prevents an incoming noise.
Varistor Z2 deals with the excessive surge voltage from thunder, etc.

Rectifier circuit 1 rectifies input AC voltage at D1, which is input to PFC circuit. Varistors Z3 and Z4 deal with the excessive
surge voltage from thunder, etc.

Refer to Fig.1 (A), (B), (C)

2) PFC Switching Circuit

Rectified input voltage at D1 is boosted by the switching operation of transformer L4, FET Q2, diode D10, and smoothed by
electrolytic capacitor C30.

The voltage between both terminals of C30 becomes PFC output voltage (DC390V TYP.).
Refer to Fig.1 (D)

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

3) PFC Controller Circuit

When the voltage is added to the Vcc terminal (Pin 8 of IC1) of PFC controller circuit, oscillation signal output (Pin 7 of IC1) is
led to the PFC switching circuit, and switches the rectified DC voltage.

As for supplying the voltage to Vcc terminal (Pin8 of IC1), it is fed from PFC start-up circuit on start-up and from Vcc voltage
feeding circuit at normal times. The supply voltage to Vcc voltage feeding circuit is fed from T1 (Sub winding).

(*1) Although it is fed from sub winding of T1 at normal times, mainly fed from Vcc voltage feeding circuit of PFC circuit.
PC1 (on Sub board) detects the operating state of PFC circuit operation and transmits the result to DC alarm detection circuit

(Refer to Alarm Signal Sending Circuit (P.28)).
Refer to Fig.1 (E), (H), (I)

IC1 (on Main board)

Pin1 FB: Voltage error amp -input
Pin2 COMP: Voltage error amp output
Pin3 MUL: Multiplexer input
Pin4 IS: Current sense
Pin5 ZCD: Zero cross current detector input
Pin6 GND: GND
Pin7 OUT: Gate pulse output
Pin8 VCC: Input voltage

4) AC Detection Circuit

Provided the input AC voltage rectified by D16 and D17 at Rectifier Circuit 2 is 80Vrms or above, transistors Q7, Q8 and Q9
(on Sub board) turn ON. The current flows through a diode of PC2 (on Sub board) and reaches the AC alarm detection circuit
(Refer to Alarm Signal Sending Circuit (P.28)).

To put it simply PC2 detects the operating state of the AC detection circuit operation and transmits the result to the AC alarm
detection circuit (Refer to Alarm Signal Sending Circuit (P.28)).

Refer to Fig.1 (F), (G)

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

8.1.1.2. Main Converter

This section mainly explains about the operation of main converter circuit which converts PFC output voltage to 41V (TYP.)
output.

1) Switching Circuit

This circuit uses Self-excited Pseudo Resonance Type Converter. This system supplies DC voltage through the following
process: The DC voltage provided from the Rectifier and Smoothing Circuit is converted into RF pulse by switching ON/OFF
MOS FET Q11 repeatedly. While Q11 is switched ON, the energy is charged in the primary of T1, and it will be discharged to
the secondary of T1 while Q11 is OFF.

Constant voltage is controlled by giving feedback to the control circuit from the output through PC601.

The main switch Q11 is controlled by IC2.
Refer to Fig.2 (A), (B).

2) Main Converter Output Circuit

T1 output voltage is rectified by D101, and smoothed by capacitors C104 and C105 (41V TYP.).
Refer to Fig. 2 (C)

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

IC2 (on Sub board)

Pin1 Corrector
Pin2 Vout
Pin3 Emitter
Pin4 VF
Pin7 ON/OFF
Pin8 OVP
Pin9 DET
Pin10 F/B
Pin11 T-ON
Pin12 CF
Pin13 T-OFF
Pin14 CT
Pin17 GND
Pin18 CLM­Pin19 CLM+
Pin20 Vcc
Pin5, 615, 16 Heat Sink Pin

3) Latch Circuit

When secondary side protection circuit (Refer to Protection Circuit (P.29)) worked in abnormal state, the signal is sent to OVP
terminal (Pin8 of IC2) of primary side through PC4. Therefore, switching operation of Q11 is stopped and the main converter
operation is stopped.

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

8.1.1.3. Output voltage

This section explains mainly about the operation of circuit which converts the main converter output to 15V, 15VPT, 30V and
41V, and also explains about the over current protector of each output.

1) 15V Output

1-1) 15V Output Converter Switching Circuit

Main converter output voltage is stepped down by the switching operation of choke transformer T301 (Main winding), FET
Q302 and diode D310, then smoothed by electrolytic capacitor C305. The smoothed voltage is controlled by the voltage of
Pin 2 of IC301 (on Sub board) to get a constant voltage.

Refer to Fig. 3-1 (B).

1-2) 15V Output Converter Controller Circuit

The signal from controller circuit centering on IC301 (on Sub board) operates the switching part. The output from main
converter is stepped down and fed to the Vc terminal (Pin 7 of IC301). Then the oscillation signal from output terminal (Pin
6 of IC301) is led to the gate of FET Q302 to switch the voltage.

Refer to Fig. 3-1 (C).

1-3) 15V Output Over Current Protection Circuit

When Over Current flows to 15V output, the potential difference between terminals of R302 and R303 occurs. The voltage
potential difference turns ON Q301 to send the over current signal to the control circuit. Consequently 15V output shuts
down operating intermittently.

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

IC301 (on Sub board)

Pin1 Compensating: Voltage error amplifier output
Pin2 Voltage Feedback: Inverting input of the error amplifier
Pin3 Current sence: Voltage proportional inductor current
Pin4 Rt/Ct: Timing Resistor and Cap
Pin5 GND: Ground
Pin6 Output: Output for driving a power MOS-FET
Pin7 Vcc: Input Voltage
Pin8 Vref: Reference Voltage

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

2) 15VPT Output

2-1) 15V PT Output

During normal operation FET Q401 is ON and connected to 15V output. Then regulated 15V is output. At that time the
comparator IC401 output is high, and the transistor Q402 is OFF.

When the 15VPT goes into the over current condition, the voltage difference occurs at detection resistors R401, R402 and
R403. The voltage of IC401 +terminal becomes lower than that of -terminal, and then output of IC401 becomes LOW. Q402
turns ON and Q401 turns OFF.

Consequently the fold back current limiting shuts down 15VPT output.
Refer to Fig. 3-2 (A), (B).

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

3) 30V Output Voltage

3-1) 30V Output Converter Switching Circuit

The main converter output voltage is stepped down by switching choke coil L202, FET Q202 and diode D210, and then
smoothed by electrolytic capacitor C205. The smoothed voltage is regulated by the voltage of Pin 2 of IC201.

Refer to Fig. 3-3 (B).

3-2) 30V Output Converter Controller Circuit

The signal from controller circuit centering on IC201 (on Sub board) operates the switching part. The output from main
converter is dropped and fed to the Vc terminal (Pin 7 of IC201). And then the oscillation signal from the OUT terminal (Pin
6 of IC201) is led to the gate of FET Q202 to switch the voltage.

Refer to Fig. 3-3 (C).

3-3) 30V Output Over Current Protection Circuit

When Over Current flows to 30V output, the potential difference between terminals of R202 and R203 occurs. The voltage
potential difference turns ON Q201 to send the over current signal to the control circuit. Consequently 30V output shuts
down operating intermittently.

Refer to Fig. 3-3 (A).

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

IC301 (on Sub board)

Pin1 Compensating: Voltage error amplifier output
Pin2 Voltage Feedback: Inverting input of the error amplifier
Pin3 Current sence: Voltage proportional inductor current
Pin4 Rt/Ct: Timing Resistor and Cap.
Pin5 GND: Ground
Pin6 Output: Output for driving a power MOS-FET
Pin7 Vcc: Input Voltage
Pin8 Vref: Reference Voltage

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

4) 41V Output Voltage

4-1) 41V Output

During normal operation FET Q156 is ON. 41V output is connected to the main converter output, and the regulated output
by the main converter is output.

Transformer T301 sub-winding voltage of 15V output converter is led to the voltage gate of Q156 and Q156 is turned ON.
Refer to Fig. 3-4 (A).

4-2) 41V Output Over Current Protection Circuit

When Over Current flows to 41V output, the potential difference between terminal of R180 occurs causing Q157 to turn ON.
Q156 is OFF because the potential difference between the gate and the source disappears. Consequently the fold back
current limiting shuts down 41V output.

Refer to Fig. 3-4 (B).

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

8.1.1.4. Battery Voltage Input/Output

This section explains about the operation of Battery Voltage Input/Output.

1) While Outputting the Battery Voltage (While charging)

During normal operation FETs Q153 and Q155 of battery Input/Output DC switching circuit are ON and connected to the main
converter to output the regulated main converter output voltage.

When the battery switch SW501 is turned ON and CN102 is shorted between pin 3 and 4, the voltage is fed from main converter
output to the controller circuit. Transistors Q503 and Q504 of battery controller circuit are turned ON. n-BATT output signal
output becomes LOW. And also transistor Q505 is turned ON, the voltage from T301 (Sub winding) is fed to the gate of Q153
and Q155, and then Q153 and Q155 turn ON. On the other hand, when the battery switch SW501 is turned OFF, Q503 and
Q504 are turned OFF, n-BATT output signal output becomes OPEN.

When over current flows to battery output, the voltage difference occurs at detection resistors R172, R191 and R192. Q154
becomes ON and Q153 becomes OFF.

Consequently the fold back current limiting shuts down battery output.
Refer to Fig. 4 (A), (B).

2) While Battery Voltage is being Input (At the time of the power failure)

The battery voltage is passed through FET Q155 and diode D157, and then fed to main converter output (C401, C402 and
C403).

When battery voltage is decreased, Q503, Q504 and Q505 of battery controller circuit become OFF, and Q155 of battery
input/output DC switch circuit is turned OFF.

Consequently the battery is cut, and power supply is stopped.
Refer to Fig. 4 (A), (B).

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

8.1.1.5. Alarm Signal Sending Circuit

This section explains about the operation of the circuit that sends AC alarm/DC alarm.

1) Dropper Circuit

The main converter output voltage is dropped to 27V by the constant voltage circuit consisting of Q521 and zener diode D521
to feed the power supply.

Refer to Fig. 5 (C).

2) AC Alarm Signal Sending Circuit

When input AC voltage is high, a current flows to the diode of PC2 in the AC detection circuit (Refer to AC Input ~ PFC Output
(P.17)) to turn ON the transistor of PC2. Therefore, output voltage from the dropper circuit is fed to the AC alarm sending circuit.
The transistor Q532 (on Sub board) turns ON, and then AC alarm sending output becomes LOW.

On the other hand, when input AC voltage is low, PC2 turns OFF, transistor Q532 (on Sub board) turns OFF, and then AC alarm
sending output becomes OPEN.

Refer to Fig. 5 (D).

3) DC Alarm Signal Sending Circuit

When 15VPT, 30V and 41V output voltage normally, transistors Q541 and Q544 (on Sub board) in output voltage detection
circuit turn ON, then the voltage fed from dropper circuit turns ON Q544 and PC1 (or Q506*1), transistor Q540 in DC alarm
sending circuit becomes ON, then DC alarm sending output becomes LOW.

When any of 15VPT, 30V and 41V output becomes abnormal, transistors Q541 and Q544 (on Sub board) turn OFF, Q540
becomes OFF, and then DC alarm sending output becomes OPEN.

(*1) AC input operation: PC1, Battery operation: Q506
Refer to Fig. 5 (A), (B).

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

8.1.1.6. Protection Circuit

This section explains about the Over Voltage Protection Circuit and Over Heat Protection Circuit and Battery Reverse
Connection Protection Circuit.

1) Abnormal Condition Detection Circuit

Abnormal condition detection circuit consists of thyristors Q524 and Q525 (on Sub board). When power supply operation
becomes abnormal, the abnormal detection signal is sent and Q524 and Q525 are turned ON. A current flows through the diode
of PC4 (on Sub board), which is sent to the latch circuit of main converter, and the operation of main converter is stopped.

Refer to Fig. 6 (D).

2) Over Heat Detection Circuit

When internal temperature of power supply rises abnormally, resistance value of thermistor NTC501 becomes low, transistor
Q590 (on Sub board) turns OFF, and voltage from pin 8 of IC301 is sent to the abnormal detection circuit.

Refer to Fig. 6 (A).

3) Battery Reverse Connection Protection Circuit

When the battery is connected to the unit in the wrong direction by mistake, the voltage of plus terminal becomes minus. Then
diodes D523, D524 and D525 turn ON. The transistor Q511 (on Sub board) turns ON, and the voltage from dropper circuit
(Refer to Alarm Signal Sending Circuit (P.28)) is sent to the abnormal detection circuit through zener diode D529 (on Sub
board).

Refer to Fig. 6 (B).

4) Over Voltage Protection Circuit

When any of 15V, 15VPT, 30V and main converter 41V output becomes abnormal, the voltage is sent to the abnormal detection
circuit through zener diode D529 (on Sub board).

Refer to Fig. 6 (C).

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X

8.2. PSU-M (KX-TDA0104XJ/X)

This power supply unit consists of four boards.

8.2.1. Block Diagram and Circuit Description of PSU-M

[Block Diagram of PSU-M]

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KX-TDA0103XJ / KX-TDA0104XJ / KX-TDA0108XJ / KX-TDA0103X / KX-TDA0104X / KX-TDA0108X