Panasonic KX-TC1468LBB Service Manual

ORDER NO. KM40206883C3

Telephone Equipment

KX-TC1468LBB

900MHz Cordless Phone

Black Version

(for Brazil)

© 2002 Kyushu Matsushita Electric Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.

KX-TC1468LBB

CONTENTS

Page Page

1 STANDARD BATTERY LIFE 4

1.1. Recharge 4

1.2. Battery Information

2 LOCATION OF CONTROLS 5

2.1. Base unit 5

2.2. Handset

2.3. Battery Replacement

3 CONNECTIONS 7

3.1. Adding Another Phone 9

4 OPERATIONS 10

4.1. Making Calls 10

4.2. Answering Calls

5 DISASSEMBLY INSTRUCUTIONS 11

6 HOW TO REMOVE TEL JACK

7 TROUBLESHOOTING GUIDE

7.1. Check Power 15

7.2. Bell Reception

7.3. Check Battery Charge

7.4. Check Link

7.5. Check Handset Transmission

7.6. Check Handset Reception

8 ADJUSTMENTS (BASE UNIT) 21

10

13

14

16

17

18

20

20

4

5

6

8.1. Test Mode Flow Chart (Base Unit) 21

8.2. Adjustment

8.3. Adjustment Standard (Base Unit)

9 ADJUSTMENTS (HANDSET) 25

9.1. Test Mode Flow Chart (Handset) 25

9.2. Adjustment

9.3. Adjustment (Handset)

10 FREQUENCY TABLE (MHz) 29

11 BLOCK DIAGRAM (Base Unit)

12 CIRCUIT OPERATION

12.1. Outline 31

12.2. Power Supply Circuit

12.3. Reset Circuit

12.4. Charge Circuit

12.5. Telephone Line Interface

12.6. Transmitter/Receiver

12.7. Signal Route

13 BLOCK DIAGRAM (Handset) 36

14 CIRCUIT OPERATION (HANDSET)

14.1. Outline 37

14.2. Reset Circuit/Charge Circuit

14.3. Battery Low / Power Down Detector

22

23

26

27

30

31

31

32

33

34

34

35

37

37

38

2

KX-TC1468LBB

15 HOW TO REPLACE FLAT PACKAGE IC 39

15.1. Preparation 39

15.2. Procedure

15.3. Modification Procedure of Bridge

39

39

16 CPU DATA (Base Unit) 40

16.1. IC3 40

16.2. Digital Security Coding System

40

17 CPU DATA (Handset) 41

17.1. U1 41

18 EXPLANATION OF IC TERMINALS (RF Unit) 42

18.1. IC1 42

19 CABINET AND ELECTRICAL PARTS LOCATION (BASE UNIT)

20 CABINET AND ELECTRICAL PARTS LOCATION (HANDSET)

21 ACCESSORIES AND PACKING MATERIALS

43

44

45

22 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES

46

22.1. Base Unit 46

22.2. Handset

46

23 REPLACEMENT PARTS LIST 47

23.1. Base Unit 47

23.2. Handset

23.3. Accessories and Packing Materials

50

52

24 FOR SCHEMATIC DIAGRAM 53

24.1. Base Unit 53

24.2. Handset

53

25 SCHEMATIC DIAGRAM (Base Unit) 54

25.1. Main 54

25.2. RF Module

55

26 SCHEMATIC DIAGRAM (Handset) 56

26.1. Main 56

26.2. RF Module

57

27 CIRCUIT BOARD (Base Unit) 58

27.1. Main (Component View) 58

27.2. Main (Flow Solder Side View)

27.3. Locator (Component View)

27.4. Locator (Flow Solder Side View)

27.5. RF Module

59

60

60

61

28 CIRCUIT BOARD (Handset) 62

28.1. Main (Component View) 62

28.2. Main (Flow Solder Side View)

28.3. RF Module

63

64

3

Operation

Operating time

KX-TC1468LBB

1 STANDARD BATTERY LIFE

1.1. Recharge

1.2. Battery Information

After your Panasonic battery is fully charged:

While in use (TALK) Up to about 5 hours

While not in use (Standby) Up to about 5 days

· The battery operating time may vary depending on usage conditio ns and ambient temperature.

· Clean the handset and the base unit charge contacts with a soft, dry cloth. Clean if the unit is subject to grease, dust

or high humidity

· If the battery is fully charged, you do not have to place the handset on the base unit until the IN USE indicator flashes. This will

maximize the battery life.

· The battery cannot be overcharged.

. Otherwise the battery may not charge properly.

4

2 LOCATION OF CONTROLS

2.1. Base unit

KX-TC1468LBB

2.2. Handset

5

KX-TC1468LBB

2.3. Battery Replacement

6

3 CONNECTIONS

KX-TC1468LBB

· USE ONLY WITH Panasonic AC ADAPT OR PQWATC1468LB.

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

7

KX-TC1468LBB

8

3.1. Adding Another Phone

This unit will not function during a power failure. To connect a standard telephone on the same line, use a T-adapto r.

KX-TC1468LBB

9

KX-TC1468LBB

4 OPERATIONS

4.1. Making Calls

4.2. Answering Calls

10

5 DISASSEMBLY INSTRUCUTIONS

Show in Fig.

To remove.

Remove.

KX-TC1468LBB

1 Lower Cabinet Screws (2.6 × 8)................ ....... (A) × 4

2 Locator P.C.Board Screws (2.3 × 6)................ ....... (B) × 4

Locator P.C.Board

3 RF P.C.Board Screws (2 × 6)................ ....... (C) × 3

RF P.C.Board

4 Main P.C.Board Screws (2.3 × 6)................ ....... (D) × 4

Main P.C.Board

11

Show in Fig.

To remove.

Remove.

KX-TC1468LBB

5

6 Screws (2.6 × 8)................ ......(E) × 2

Rear Cabinet

Battery compartment cover.

7

8 Antenna Screw (2.6 × 8)................ ......(F) × 1

RF P.C.Board Screws (2 × 6)................ ......(G) × 2

RF P.C.Board.

9 Main P.C.Board Screws (2 × 6)................ ......(H) × 2

Main P.C.Board

12

KX-TC1468LBB

6 HOW TO REMOVE TEL JACK

1. Keep 2 hooks for TEL JACK fixing open in the direction of arrow 1, then pull the top of TEL JACK forward as shown arrow 2
until the hooks click. (Refer to

2. Remove TEL JACK pulling just above in the direction of arrow 3. (Refer to

Fig. 1.)

Fig. 2.)

13

KX-TC1468LBB

7 TROUBLESHOOTING GUIDE

Cross Reference:

Check Power

Bell Reception (P.16)

Check Battery Charge (P.17)

Check Link (P.18)

Check Handset Transmission (P.20)

Check Handset Reception (P.20)

(P.15)

14

7.1. Check Power

KX-TC1468LBB

Cross Reference:

Reset Circuit

Power Supply Circuit (P.31)

** :

CONNECTIONS (P.7)

Cross Reference:

Charge Circuit

* : Each measurement points are shown in CIRCUIT BOARD (Base Unit) (P.58) or CIRCUIT BOARD (Handset) (P.62)

(P.32)

(P.33)

Note:

CPU: IC3

Note:

CPU: U1

15

KX-TC1468LBB

7.2. Bell Reception

Cross Reference:

Telephone Line Interface

* : Each measurement points are shown in CIRCUIT BOARD (Base Unit) (P.58) or CIRCUIT BOARD (Handset) (P.62)

(P.34)

Note:

CPU : IC3

16

7.3. Check Battery Charge

KX-TC1468LBB

Cross Reference:

Charge Circuit

Power Supply Circuit (P.31)

** :

CONNECTIONS (P.7)

Cross Reference:

Reset Circuit/Charge Circuit

*: Each measurement points are shown in CIRCUIT BOARD (Base Unit) (P.58) or CIRCUIT BOARD (Handset) (P.62)

(P.33)

(P.37)

Note:

CPU: IC3

Note:

CPU: U1

17

KX-TC1468LBB

7.4. Check Link

**: Refer to Adjustment (P.22) Note:

CPU: IC3

RF IC: IC1

*: Each measurement points are shown in CIRCUIT BOARD (Base Unit) (P.58) or CIRCUIT BOARD (Handset) (P.62)

18

KX-TC1468LBB

**: Refer to Adjustment (P.26). Note:

CPU: U1

RF IC: IC1

*: Each measurement points are shown in RF Module (P.64)

19

KX-TC1468LBB

7.5. Check Handset Transmission

Cross Reference:

Signal Route

(P.35)

7.6. Check Handset Reception

Cross Reference:

Signal Route

(P.35)

20