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Panasonic KX-TC1468LBB, Service Manual

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Panasonic KX-TC1468LBB Service Manual Download Page 11

5  DISASSEMBLY INSTRUCUTIONS

Show in Fig.

To remove.

Remove.

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

KX-TC1468LBB

Summary of Contents for KX-TC1468LBB

Page 1: ...hu Matsushita Electric Co Ltd All rights reserved Unauthorized copying and distribution is a violation of law KX TC1468LBB 900MHz Cordless Phone Black Version for Brazil Telephone Equipment ORDER NO KM40206883C3 ...

Page 2: ...Reception 20 8 ADJUSTMENTS BASE UNIT 21 8 1 Test Mode Flow Chart Base Unit 21 8 2 Adjustment 22 8 3 Adjustment Standard Base Unit 23 9 ADJUSTMENTS HANDSET 25 9 1 Test Mode Flow Chart Handset 25 9 2 Adjustment 26 9 3 Adjustment Handset 27 10 FREQUENCY TABLE MHz 29 11 BLOCK DIAGRAM Base Unit 30 12 CIRCUIT OPERATION 31 12 1 Outline 31 12 2 Power Supply Circuit 31 12 3 Reset Circuit 32 12 4 Charge Cir...

Page 3: ...RANSISTORS 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 50 23 3 Accessories and Packing Materials 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 Compon...

Page 4: ... vary depending on usage conditions 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 Otherwise the battery may not charge properly 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 Th...

Page 5: ...2 LOCATION OF CONTROLS 2 1 Base unit 2 2 Handset 5 KX TC1468LBB ...

Page 6: ...2 3 Battery Replacement 6 KX TC1468LBB ...

Page 7: ...3 CONNECTIONS USE ONLY WITH Panasonic AC ADAPTOR PQWATC1468LB The AC adaptor must remain connected at all times It is normal for the adaptor to feel warm during use 7 KX TC1468LBB ...

Page 8: ...8 KX TC1468LBB ...

Page 9: ...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 adaptor 9 KX TC1468LBB ...

Page 10: ...4 OPERATIONS 4 1 Making Calls 4 2 Answering Calls 10 KX TC1468LBB ...

Page 11: ...NS Show in Fig To remove Remove 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 KX TC1468LBB ...

Page 12: ...ig To remove Remove 5 Rear Cabinet Battery compartment cover 6 Screws 2 6 8 E 2 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 ...

Page 13: ... 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 Fig 1 2 Remove TEL JACK pulling just above in the direction of arrow 3 Refer to Fig 2 13 KX TC1468LBB ...

Page 14: ...7 TROUBLESHOOTING GUIDE Cross Reference Check Power P 15 Bell Reception P 16 Check Battery Charge P 17 Check Link P 18 Check Handset Transmission P 20 Check Handset Reception P 20 14 KX TC1468LBB ...

Page 15: ...32 Power Supply Circuit P 31 CONNECTIONS P 7 Cross Reference Charge Circuit P 33 Note CPU IC3 Note CPU U1 7 1 Check Power Each measurement points are shown in CIRCUIT BOARD Base Unit P 58 or CIRCUIT BOARD Handset P 62 15 KX TC1468LBB ...

Page 16: ...Cross Reference Telephone Line Interface P 34 Note CPU IC3 7 2 Bell Reception Each measurement points are shown in CIRCUIT BOARD Base Unit P 58 or CIRCUIT BOARD Handset P 62 16 KX TC1468LBB ...

Page 17: ...pply Circuit P 31 CONNECTIONS P 7 Cross Reference Reset Circuit Charge Circuit P 37 Note CPU IC3 Note CPU U1 7 3 Check Battery Charge Each measurement points are shown in CIRCUIT BOARD Base Unit P 58 or CIRCUIT BOARD Handset P 62 17 KX TC1468LBB ...

Page 18: ... Refer to Adjustment P 22 Note CPU IC3 RF IC IC1 7 4 Check Link Each measurement points are shown in CIRCUIT BOARD Base Unit P 58 or CIRCUIT BOARD Handset P 62 18 KX TC1468LBB ...

Page 19: ... Refer to Adjustment P 26 Note CPU U1 RF IC IC1 Each measurement points are shown in RF Module P 64 19 KX TC1468LBB ...

Page 20: ...7 5 Check Handset Transmission Cross Reference Signal Route P 35 7 6 Check Handset Reception Cross Reference Signal Route P 35 20 KX TC1468LBB ...

Page 21: ...ansmit power output is low and the operating distance between the base unit and the handset is less than normal Make confirmation in item D The reception sensitivity of base unit is low with noise Make confirmation in item E The transmit level is high or low Make confirmation in item F The reception level is high or low Make adjustments in item G The unit does not link Make confirmation in item H ...

Page 22: ...onfirm that the distortion reading of Audio Analyzer is less than 25 FL501 CF501 IC1 F Line Output Level Confirmation CH1 Talk 1 Apply 60dBm output from S S G modulation frequency 1KHz dev 25KHz 2 Confirm that the reading of Audio Analyzer is 20 1dBm 600Ω load IC2 G Line Input Modulation Confirmation CH1 Talk 1 Input via loop simulator 1 0KHz 10dBm measured at T R signal 2 Confirm so that the read...

Page 23: ...8 3 Adjustment Standard Base Unit Main Flow Solder Side View AF OSC LOOP SIMULATOR Audio Analyzer E F Tip Ring IC3 23 KX TC1468LBB ...

Page 24: ... RF Module IC1 14 15 28 29 42 43 56 1 TP809 TXVCO TP808 RXVCO TP510 D M A FM Deviation Meter G I Frequency Counter C SSG 925 9MHz Spectrum Analyzer D D M B H Oscillo scope SIG_OUT GND 24 KX TC1468LBB ...

Page 25: ...nce between the base unit and the Handset is less than normal Make confirmation in item E The reception sensitivity of base unit is low with noise Make confirmation item F Does not link between the base unit and the handset Make confirmation in item G The reception level is high or low Make confirmation item H The transmit level is high or low Make adjustments in item I Refer to Adjustment P 26 Un...

Page 26: ...ion frequency 1KHz dev 25KHz 2 Confirm that the distortion reading of Audio Analyzer is less than 25 FL501 CF501 IC1 F RSSI Confirmation Talk 1 Measure the SSG output level when the SIG_OUT changes from Low to High modulation frequency 1KHz dev 25kHz 2 Confirm that the SSG output level is 70 15dBm IC1 FL501 G Speaker Output Level confirmation Talk 1 Apply 47dBm output from S S G modulation frequen...

Page 27: ...9 3 Adjustment Handset Main component View DC Power Supply Battery 27 KX TC1468LBB ...

Page 28: ...IC1 TP809 TXVCO TP808 RXVCO TP510 1 14 15 28 29 42 43 56 Audio Analyzer Oscillo scope AF Generator GND SIG_OUT MIC_IN E G D M B FM Deviation Meter H I Spectrum Analyzer D Frequency Counter C D M A 28 KX TC1468LBB ...

Page 29: ...2 85 926 65 926 65 902 85 17 902 90 926 70 926 70 902 90 18 902 95 926 75 926 75 902 95 19 903 00 926 80 926 80 903 00 20 903 05 926 85 926 85 903 05 21 903 10 926 90 926 90 903 10 22 903 15 926 95 926 95 903 15 23 903 20 927 00 927 00 903 20 24 903 25 927 05 927 05 903 25 25 903 30 927 10 927 10 903 30 26 903 35 927 15 927 15 903 35 27 903 40 927 20 927 20 903 40 28 903 45 927 25 927 25 903 45 29...

Page 30: ...506 MIXER Q512 RF Module LNA Low Noise Amp Q555 Q556 DUPLEXER ANTENNA LPF FL501 9V DC 9V To H S Q2 Q10 CHARGE DETECT Q9 VOLTAGE REGULATOR 5V Doubler Buffer Q510 TX_VCO Q509 VD502 Q8 TX ON OFF TX AUDIO 39 36 8 15 43 9 46 EXP COMP transmit receive COM_STB COM_DATA COM_CLK RSSI REF_CLK RX_DATA X2 4MHz TX_DATA KX TC1468LBB BLOCK DIAGRAM BASE UNIT Det MIC_IN MIC_IN SIG_OUT 1st IF IN RX_PD TX_PD SF_OUT ...

Page 31: ...l interfaces ex LED KEY Detector Circuit Charge Power Down RF IC IC1 PLL Oscillator Compress Expander Amplifier for transmission and reception Additionally Power Supply Circuit Reset Circuit Charge Circuit Telephone Line Interface Circuit 12 2 Power Supply Circuit The power supply to the CPU Digital Analog and RF IC from AC Adaptor 9V as shown in diagram in Reset Circuit P 32 31 KX TC1468LBB ...

Page 32: ...12 3 Reset Circuit After power supply from AC adaptor the VDD 5 0V is input to Q6 Q7 for making reset signal Refer to the below waveform Fig 101 Fig 102 32 KX TC1468LBB ...

Page 33: ...andset on the base unit the charge current is as follows DC 9V L1 CHG Base CHG1 Handset D1 BAT1 Battery BAT2 GND D2 D3 CHG2 Handset CHG2 Base L7 ZD11 DC GND In this way the CPU on both unit detects the fact that the battery is charged Fig 103 33 KX TC1468LBB ...

Page 34: ...ck Circuit Operation The voice signal input from the TEL LINE interface goes to RF IC IC1 as shown in BLOCK DIAGRAM Base Unit P 30 And the signal goes through the compressor and SPLATTER FILTER of RF IC it is output to transmitter circuit The signal of the data sent to the handset is applied too The capacitor of VARICAP VD502 is changing in accordance with the voice signal from telephone line inte...

Page 35: ...12 7 Signal Route Each signal route is as follows 35 KX TC1468LBB ...

Page 36: ...CROPHONE IF FILTER CF501 MIXER Q512 LNA Low Noise Amp Q555 Q556 DUPLEXER ANTENNA LPF Doubler Buffer Q510 TX_VCO Q509 Q2 RX ON OFF Q4 Q1 Power down Q3 Q6 BUZZER CKT RESET CHARGE CIRCUIT 3 6V BATTERY R2 0R Q5 TX ON OFF STB DATA CLK REF_CLK RX_DATA TX_DATA PD IN X1 4MHz VCC KX TC1468LBB BLOCK DIAGRAM HANDSET 37 46 15 SP OUT 2 1st IF_IN RX PD SFC 2 SP OUT 1 MIC_IN Key 16 4 10 15 18 11 5 27 25 16 17 1 ...

Page 37: ...or Circuit Charge Battery Low RAM for keeping the data CH Number ID Code etc RF IC IC1 PLL Oscillator Compress Expander Amplifier for transmission and reception 14 2 Reset Circuit Charge Circuit The power of handset is supplied by battery Whenever the battery is recharged or inserted the impulse at CHG1 becomes Reset signal through D11 and sent to CPU Refer to Charge Circuit P 33 Fig 201 37 KX TC1...

Page 38: ...tly every detected blocks are inseide of RF IC The detected voltage is as follows Battery Low Battery voltage V Batt 3 57V The CPU detects this level and IN USE starts flashing Power Down Battery voltage V Batt 3 36V The output of RF IC P DOWN becomes low level then CPU stops working to keep the data CH number ID Code etc Fig 202 38 KX TC1468LBB ...

Page 39: ...5 Specific gravity 0 863 Original flux will be replaced daily 15 2 Procedure 1 Temporary fix FLAT PACKAGE IC by soldering on two marked 2 pins Most important matter is accurate setting of IC to the corresponding soldering foil 2 Apply flux for all pins of FLAT PACKAGE IC 3 Solder employing specified solder to direction of arrow as sliding the soldering iron 15 3 Modification Procedure of Bridge 1 ...

Page 40: ...7 P73 TXPWR H O TX power control L TX power on 18 P72 RESERVED H O 19 P17 FLASHOPT L I Flash time option H 600ms L 100ms 20 P16 COMCLK L O Combo chip clock normal low output Pull low through 10k 21 P15 COMDATA L O Combo chip data normal low output 22 P14 COMSTB L O Combo chip strobe normal low output 23 P13 RXDATA H I RX path data input 24 P12 LSEIZE L O Line seize control H seize line 25 P11 CHGD...

Page 41: ...circuit L RX power on 12 P77 E_MUTE H O TALK LED L LED ON 13 P76 POW_DWN_IN I Power Down Detect in H L Detect 14 VSS VSS Ground 15 P75 STB L O COMBO STROBE H ENABLE 16 P74 DATA H O COMBO DATA 17 P73 CLK H O COMBO CLOCK 18 P72 TX_PWR H O TX POWER CONTROL L TX POWER ON 19 P17 C4 L O Keyout 4 normal low output 20 P16 C3 L O Keyout 3 normal low output 21 P15 C2 L O Keyout 2 normal low output 22 P14 C1...

Page 42: ...CC2 40 PDL BL PD threshold selection 13 DOUT Data amp output 41 VSS RX counter Gnd 14 GND2 Ground 2 42 FIN_RX RX counter input 15 SPOUT2 SP amp output 1 43 SIGOUT LD RSSI ND output 16 SPOUT1 SP amp output 2 44 BATTLOW BatteryLow output 17 SPIN SP amp input 45 VSSS Logic Gnd 18 PE Half Mute detection 46 RXPD RX phase comparator output 19 ZAP ZAP write 47 PLLREG Logic Power Source Output 20 GND3 Gro...

Page 43: ...19 CABINET AND ELECTRICAL PARTS LOCATION BASE UNIT 43 KX TC1468LBB ...

Page 44: ...20 CABINET AND ELECTRICAL PARTS LOCATION HANDSET 44 KX TC1468LBB ...

Page 45: ...21 ACCESSORIES AND PACKING MATERIALS 45 KX TC1468LBB ...

Page 46: ...22 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES 22 1 Base Unit 22 2 Handset 46 KX TC1468LBB ...

Page 47: ...n Remarks PCB1 PQWP11468LBH MAIN P C BOARD ASS Y RTL ICS IC2 271002401005 IC S IC3 273024114012 IC S TRANSISTORS Q1 203904010000 TRANSISTOR SI S Q2 203394090029 TRANSISTOR SI S Q3 203904010000 TRANSISTOR SI S Q4 203394090000 TRANSISTOR SI S Q5 203394090027 TRANSISTOR SI S Q6 203394090000 TRANSISTOR SI S Q7 203394090000 TRANSISTOR SI S Q8 203396090004 TRANSISTOR SI S Q9 203800010300 TRANSISTOR SI S...

Page 48: ... 1 C3 ECUV1C104ZFV 0 1 Ref No Part No Part Name Description Remarks C4 ECUV1C224ZFV 0 22 C5 ECUV1H103KBV 0 01 C6 220101681300 0 1 S C7 220101681309 0 01 S C8 220101681309 0 01 S C9 ECUV1C104ZFV 0 1 C10 ECUV1C104ZFV 0 1 C12 ECUV1C104ZFV 0 1 C15 ECUV1C104ZFV 0 1 C24 ECUV1C104ZFV 0 1 C28 ECUV1H471JCV 470P S C29 ECUV1H103KBV 0 01 C30 ECUV1C474ZFV 0 47 C31 PQCUV1H104ZF 0 1 S C32 223271150000 0 027 S C3...

Page 49: ...105ZF 1 C11 PQCUV1C225ZF 2 Ref No Part No Part Name Description Remarks C12 ECUV1H680JCV 68P C13 ECUV1C104ZFV 0 1 C14 ECUV1H102KBV 0 001 C15 ECUV1H473MD 0 047 S C17 PQCUV1E104MD 0 1 S C19 ECUV1C104ZFV 0 1 C20 ECUV1H101JCV 100P C21 ECUV1C104ZFV 0 1 C22 ECUV1C104ZFV 0 1 C23 ECUV1C104ZFV 0 1 C24 ECUV1H151JCV 150P C25 ECUV1C104ZFV 0 1 C28 ECUV1C104ZFV 0 1 C29 ECUV1C104ZFV 0 1 C30 PQCUV1C105ZF 1 C31 EC...

Page 50: ...DIODE SI S D10 214418000000 DIODE SI S D11 214418000000 DIODE SI S D12 214418021000 DIODE SI S D13 214418021000 DIODE SI S D16 214418021000 DIODE SI S D17 214418021000 DIODE SI S ZD1 212560600000 DIODE SI S LED Ref No Part No Part Name Description Remarks LED 335050300005 LED S COILS L2 PQLQZK680K COIL L3 PQLQZK680K COIL RESISTORS R1 PQ4R10XJ330 33 S R2 ERJ3GEY0R00 0 R4 ERJ3GEY0R00 0 R5 ERJ3GEYJ15...

Page 51: ...Y0R00 0 R593 ERJ3GEYJ102 1k R604 ERJ3GEYJ471 470 R606 ERJ3GEYJ123 12k R609 ERJ3GEYJ123 12k R610 ERJ3GEYJ513 51k Ref No Part No Part Name Description Remarks R611 ERJ3GEYJ273 27k R619 ERJ3GEY0R00 0 R621 ERJ3GEY0R00 0 R622 ERJ3GEY0R00 0 R16A ERJ3GEYJ433 43k R16A ERJ3GEYJ513 51k R16A ERJ3GEYJ623 62k R16A ERJ3GEYJ753 75k R16A ERJ3GEYJ913 91k R16A ERJ3GEYJ473 47k R16A ERJ3GEYJ563 56k R16A ERJ3GEYJ683 6...

Page 52: ...04MD 0 1 S C593 ECUV1H680JCV 68P C595 ECUV1H100DCV 10P S C597 ECUV1H010CCV 1P C598 ECUV1H020CCV 2P C599 ECUV1H150JCV 15P C602 ECUV1H010CCV 1P C604 ECUV1H222KBV 0 0022 C605 ECUV1H270JCV 27P EC2 ECEA1HKA3R3 3 3 ESC10 ECUV1C104ZFV 0 1 R13 ECUV1H102KBV 0 001 OTHERS T1 250076000000 TRANS S VR1 237472000000 VARIABLE RESISTOR S 23 3 Accessories and Packing Materials Ref No Part No Part Name Description R...

Page 53: ...w technology Important Safety Notice Components identified by mark have special characteristics important for safety When replacing any of these components use only the manufacturer s specified parts 24 2 Handset 1 DC voltage measurements are taken with an oscilloscope or a tester with a ground 2 The schematic diagrams and circuit board may be modified at any time with the development of new techn...

Page 54: ...p 4 5Vp p Reception Input f 1kHz 686mVp p 10dBm 600Ω 5V 4 5V 5V KX TC1468LBB SCHEMATIC DIAGRAM Base Unit Main To H S To AC Adaptor Tip Ring AR1 Hi AR2 Lo AR3 Hi AR7 Lo 100msec N C 47k N C 47k 300msec N C 47k 47k N C 600msec 47k N C N C 47k 730msec 47k N C 47k N C Reserved IC3 13pin IC3 19pin Flash time option Remark IC3 11pin R53 61 N C 47k Pulse Dial Break 67 K X T C 1 4 6 8 L B B ...

Page 55: ...X RX 220k 47N IC1 1 75V 0 2V at CH1 10 7 MHz Tx VCO 1 8V 0 15V at CH1 KX TC1468LBB SCHEMATIC DIAGRAM Base Unit RF Module 25KHz Dev 1KHz Tone Input 25KHz Dev 1KHz Tone Output 10 7 MHz Rx VCO Tx VCO K X T C 1 4 6 8 L B B ...

Page 56: ...26 SCHEMATIC DIAGRAM Handset 26 1 Main TX RX 0R 47k N C U1 3Vp p 490mVp p Volume Input 1kHz 10 7mVp p 3 6V 3 3V 3 3V 3 3V 3 0 V 300mVp p KX TC1468LBB SCHEMATIC DIAGRAM Handset Main K X T C 1 4 6 8 L B B ...

Page 57: ...e TX RX 6 8k IC1 1 75V 0 2V at CH1 Tx VCO 1 8V 0 15V at CH1 KX TC1468LBB SCHEMATIC DIAGRAM Handset RF Module 25KHz Dev 1KHz Tone Input 25KHz Dev 1KHz Tone Output 10 7 MHz 10 7 MHz Rx VCO Tx VCO K X T C 1 4 6 8 L B B ...

Page 58: ...27 CIRCUIT BOARD Base Unit 27 1 Main Component View L seize 1 7 8 14 Power Down Tx Down SIG_OUT IC2 KX TC1468LBB BASE UNIT Main Component View 58 KX TC1468LBB ...

Page 59: ...27 2 Main Flow Solder Side View 1 28 14 15 LED P1 IC3 12 CHG_DET IC3 25 Ring_DET IC3 26 IC3 KX TC1468LBB BASE UNIT Main Flow Solder Side View 59 KX TC1468LBB ...

Page 60: ...27 3 Locator Component View KX TC1468LBB BASE UNIT Locator Component View 27 4 Locator Flow Solder Side View KX TC1468LBB BASE UNIT Locator Flow Solder Side View 60 KX TC1468LBB ...

Page 61: ...27 5 RF Module IC1 KX TC1468LBB BASE UNIT RF Module D_OUT D_IN Tx Data REC_O P_A 14 15 28 29 42 43 56 1 TP809 TXVCO TP808 RXVCO TP510 61 KX TC1468LBB ...

Page 62: ...28 CIRCUIT BOARD Handset 28 1 Main Component View KX TC1468LBB HANDSET Main Component View SP_OUT 62 KX TC1468LBB ...

Page 63: ...28 2 Main Flow Solder Side View U1 X1 KX TC1468LBB HANDSET Main Flow Solder Side View 1 14 28 15 Rec_O P_B CH_DET U1 25 63 KX TC1468LBB ...

Page 64: ...28 3 RF Module IC1 KX TC1468LBB HANDSET RF Module TP809 TXVCO TP808 RXVCO TP510 Ext_out VR1 Pre_out Tx data DET_out SIG_out 1 14 15 28 29 42 43 56 64 KX TC1468LBB M KXTC1468LBB AK ...

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