Panasonic KX-T7453 Service Manual Download Page 17 | Manualshive

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Panasonic KX-T7453 Service Manual Download Page 17

7.4. DATA COMMUNICATION CIRCUIT

1) Function

The data communication circuit serves the following functions:
Information exchanger between the DSHS and DSHS proprietary telephone, key input information as
well as data for the LED control, LCD control, etc. This information is continuously exchanged at all

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Summary of Contents for KX-T7453

Page 1: ...ORDER NO KMS0104563C1 F5 DIGITAL PROPRIETARY TELEPHONE KX T7453 KX T7453B White Version Black Version for U S A SPECIFICATIONS ...

Page 2: ...t reuse a LED which is removed from the P C Board 2 Use a soldering iron less than 15 W for exchanging LED 3 Do not heat the LED for more than 2 seconds 4 Do not move the LED after soldering 2 This unit employs the switch which is influenced by the light for the hook switch When you open the cabinet to repair the unit in the bright light the hook switch might work improperly Therefore take care no...

Page 3: ...4 DISASSEMBLY INSTRUCTIONS 4 1 HOW TO REMOVE THE LOWER CABINET Procedure 1 1 Remove the 4 screws A 2 Remove the lower cabinet 3 ...

Page 4: ...4 2 HOW TO REMOVE THE HOOK BUTTON Procedure 1 2 1 Remove the hook button 4 3 HOW TO REMOVE THE SWITCH AND MAIN BOARDS Procedure 1 2 3 4 ...

Page 5: ... the switch board connector 3 Remove the switch board 4 Pull out the flat cable See Fig 1 5 Remove the 2 screws B 6 Pull out the speaker and microphone connectors 7 Remove the main board 4 4 HOW TO REMOVE THE LCD BOARD Procedure 1 4 5 ...

Page 6: ... 1 Pull out the flat cable See Fig 1 2 Remove the LCD block See Fig 2 3 Remove the 2 screws A 4 Remove the lower cabinet 5 Remove the LCD board 6 ...

Page 7: ...5 IC DATA 5 1 IC1 7 ...

Page 8: ...eceive Data Stream 1 SX 21 output CMOS 4 0mA high PC5O02 0 1 Serial Transmit Data Stream CK2M 18 output CMOS 4 0mA high PC5O02 2 1 Serial Stream Clock EP0 13 output CMOS 2 0mA high PC5O01 0 01 External Channel Pulse EP1 14 output CMOS 2 0mA high PC5O01 0 01 External Channel Pulse EP2 15 output CMOS 2 0mA high PC5O01 0 01 External Channel Pulse EP3 16 output CMOS 2 0mA high PC5O01 0 01 External Cha...

Page 9: ...tput CMOS 4 0mA high PC5O02 0 01 Output Port 0 OP1 24 output CMOS 4 0mA high PC5O02 0 01 Output Port 1 OP2 25 output CMOS 4 0mA high PC5O02 0 01 Output Port 2 OP3 26 output CMOS 4 0mA high PC5O02 0 01 Output Port 3 CK2K 22 output CMOS 4 0mA high PC5O02 0 20 2kHz Clock Output duty 25 CK16M 36 output CMOS 2 0mA high PC5O01 16 4 Master Clock Out OSI 33 input Analog PC5X02 16 4 X tal In XIN OSO 34 out...

Page 10: ...10 ...

Page 11: ...t terminal SPO terminal is biased to Vdd 2 voltage Connect the capacitor of 0 1 F in series between the extern speaker amplifier input terminal and this terminal AG2 9 Powers supply etc Ground terminal of the analog circuit P S 10 CMOS input Micro computer interface Mode selection terminal of microcomputer interface Inputting 0 selects the serial mode and 1 selects the parallel mode RESET 11 Syste...

Page 12: ...Clock Input terminal of oscillation circuit Connect the oscillator and resistor berween this terminal and pin 30 OSCO moreover connect the capacitor between this terminal and digital ground to make the oscillation circuit OSCO 30 Output terminal of oscillation circuit Connect the oscillator and resistor berween this terminal and pin 29 OSCI moreover connect the capacitor between this terminal and ...

Page 13: ... inverting input terminal of microphone amplofier H1 VREFM 57 Power supply etc Reference voltage terminal of microphone amplifier Connect the capacitor of 40 F between this terminal and pi 56 MICG AG4 58 Ground terminal of analog circuit APMO 59 Analog input Analog Output terminal of microphone amplifier Connect the capacitor of 0 1 F to this terminal to cut the DC APMN 60 Analog input Non inverti...

Page 14: ... from pins 32 to 35 40 to 47 and 11 of IC6 LCD contrast adjustment is performed by the circuit composed of Q28 Q29 R109 R108 and R106 The contrast is determined only by the voltage level between V5 and VEE of IC202 and IC201 Higher potential makes the contrast high 14 ...

Page 15: ...15 ...

Page 16: ...tput ports C0 to C5 column and R0 to R9 of IC1 A fixed pulse T 1 82 msec is output continuously from the SCK1 terminal of IC9 This pulse is counted and the output of IC1 is shifted sequentially from C0 to C5 R0 to R7 of IC1 also output pulses and the lighting of the LED is controlled by the timing of the output ports C0 to C5 16 ...

Page 17: ...a communication circuit serves the following functions Information exchanger between the DSHS and DSHS proprietary telephone key input information as well as data for the LED control LCD control etc This information is continuously exchanged at all 17 ...

Page 18: ... an acknowledge signal 3 Reception The data from the DSHS is received via the H and L lines along the path shown below H L Line T1 IC11 Pin 5 10 IC1 Pin 38 39 IC1 Pin 21 IC2 Pin 22 4 Transmission The data to the DSHS proprietary telephone is transmitted along the following path IC2 Pin 23 IC1 Pin 20 IC1 Pin 40 41 Q1 Q2 T1 H L Line 5 IC1 GATE ARRAY DPITS Interface DPITS Layer 1 interface DR 1 0 is ...

Page 19: ... is output from TXD at the positive edge of FSYNC The second data and the followings are output at the positive edge of BCLK After all data of 8 bit are output the last data is kept until the positive edge of next FSYNC The positive edge of BCLK should be within 100ns from the positive edge of FSYNC The PCM data input from RXD is sampled at the negative edge of BCLK inside LSI The sampling of the ...

Page 20: ...CIRCUIT 1 Circuit Operation This circuit is used for transmission of a reset pulse to the CPU IC6 at the following times connecting the telephone line jack and circuit operation The timing chart is shown below 20 ...

Page 21: ...The reset signal is negledted 21 ...

Page 22: ...7 6 TONE GENERATION CIRCUIT 1 Function Calling tones Busy tone DTMF signal and Key in tone are generated in IC2 22 ...

Page 23: ...l The sampling cycle is 1ms and provided with the chattering protective circuit whose available pulse width is 1ms or more These are the rotary encoder inputs and sampled 1 kHz 1 msec cycle The built in chattering protective circuit neglects the input pulse of 1 msec or less The high pulse of 2 msec or more is available The availability of the pulse with the width of 1 2 msec is not ensured The ch...

Page 24: ...istor The detection signal is determined by the microcomputer of IC6 7 9 HANDSET CIRCUIT 1 Transmission signal path The analog input signal from the handset microphone is input to the communication LSI through the IC2 built in analog amplifier In this LSI the network control based on A D conversion and the handset software and the gain control based on the down load data from the PBX are performed...

Page 25: ... based on the down load data from the PBX are performed The voice data is sent to IC1 by the serial transmission The voice data is transmitted between PBX and DPITS with the protocol originated by KME IC3 is the SP phone amplifier which turns ON OFF using the port of IC2 The analog switch of IC12 interrupts the input signal 2 Reception siganl path The voice serial data transmitted from PBX is sent...

Page 26: ...8 2 THE LCD DOES NOT OPERATE 26 ...

Page 27: ...8 3 THE ELECTRONIC VOLUME OF THE SPEAKER PHONE DOES NOT WORK 8 4 THE ELECTRONIC VOLUME OF THE HANDSET DOES NOT WORK 27 ...

Page 28: ...8 5 SPEAKER PHONE TROUBLE 8 6 TONE DIAL TROUBLE 8 7 HANDSET TROUBLE 28 ...

Page 29: ...9 TERMINAL GUIDE OF ICS TRANSISTORS AND DIODES 29 ...

Page 30: ...SOLDER Sparkle Solder 115A 1 115B 1 or Almit Solder KR 19 KR 19RMA Soldering iron Recommended power consumption is between 30 W to 40 W Temperature of Copper Rod 662 50 F 350 10 C An expert may handle a 60 80 W iron but beginner might damage foil by overheating Flux HI115 Specific gravity 0 863 Original flux should be replaced daily 10 2 FLAT PACKAGE IC REMOVE PROCEDURE 1 When all of the IC lead c...

Page 31: ...ed 2 Using a cutter cut the lead at the source Cut the contents with the cutter lightly 5 or 6 times 3 Remove when the solder melts Remove the lead at the same time After removing the Flat IC and when attaching the new IC remove any of the excess solder on the land using the soldering wire etc If the excess solder is not removed from the land the IC will slip and not be attached properly 10 3 FLAT...

Page 32: ... for all pins of FLAT PACKAGE IC 3 Solder using the specified solder in the direction of the arrow by sliding the soldering iron 10 4 BRIDGE MODIFICATION PROCEDURE 1 Lightly re solder the bridged portion 2 Remove the remaining solder along pins using a soldering iron as shown in the figure below 11 WAVEFORM 12 CABINET AND ELECTRICAL PARTS LOCATION 32 ...

Page 33: ...13 ACCESSORIES AND PACKING MATERIALS 33 ...

Page 34: ...14 REPLACEMENT PARTS LIST Note 1 The marking RTL indicates that the Retention Time is limited for this item 34 ...

Page 35: ...ly and the laws governing parts and product retention After the end of this period the assembly will no longer be available 2 The S mark indicates service standard parts and may differ from production 3 RESISTORS CAPACITORS Unless otherwise specified All resistors are in ohms K 1000 M 1000k All capacitors are in MICRO FARADS F P F Type Wattage of Resistor 14 1 CABINET AND ELECTRICAL PARTS 35 ...

Page 36: ...ON 3KEY BLACK VERSION 18 PSBX1042Z1 BUTTON 4KEY WHITE VERSION 18 PSBX1042Z2 BUTTON 4KEY BLACK VERSION 19 PSBX1052Z3 BUTTON 15KEY WHITE VERSION 19 PSBX1052Z4 BUTTON 15KEY BLACK VERSION 20 PSSX1006Y KEY SWITCH 21 PSBE1001Z1 BUTTON ADJUST WHITE VERSION 21 PSBE1001Z2 BUTTON ADJUST BLACK VERSION 22 PSQA2021Z LABEL NOTE 23 PSGP1024X1 PANEL LCD WHITE VERSION 23 PSGP1024X2 PANEL LCD BLACK VERSION 24 PSGG1...

Page 37: ... IC S IC8 PQVINJM2904M IC IC9 PSVIBA05FP IC IC10 PSVIBA05FP IC IC11 PQVINJM319V IC SW1 PSVII24015T IC TRANSISTORS Q1 2SA1576Q TRANSISTOR SI Q2 2SA1576Q TRANSISTOR SI Q3 PQVTDTA143XU TRANSISTOR SI Q4 PQVTDTA143XU TRANSISTOR SI Q5 PQVTDTA143XU TRANSISTOR SI Q6 PQVTDTA143XU TRANSISTOR SI Q7 PQVTDTA143XU TRANSISTOR SI Q8 PQVTDTA143XU TRANSISTOR SI Q9 PQVTDTA143XU TRANSISTOR SI Q10 PQVTDTA143XU TRANSIS...

Page 38: ...VGCT LED D107 PSVD2SRVGCT LED D108 PSVD2SRVGCT LED D109 PSVD2SRVGCT LED D110 PSVD2SRVGCT LED D111 PSVD2SRVGCT LED D112 PSVD2SRVGCT LED D113 PSVD2SRVGCT LED D114 PSVD2SRVGCT LED D115 PSVD2SRVGCT LED D116 PSVD2SRVGCT LED D117 PSVD2SRVGCT LED D118 PSVD2SRVGCT LED D119 PSVD2SRVGCT LED D120 PSVD2SRVGCT LED D121 PSVD2SRVGCT LED D122 PSVD2SRVGCT LED D123 PSVD2SRVGCT LED D124 PSVD1SRCT LED D125 PSVD1SRCT ...

Page 39: ... 39 ...

Page 40: ... 0 L8 PQ4R10XJ000 0 L10 ERJ3GEY0R00 0 L11 ERJ3GEY0R00 0 L12 ERJ3GEY0R00 0 L13 ERJ3GEY0R00 0 L14 ERJ3GEY0R00 0 L15 ERJ3GEY0R00 0 L16 ERJ3GEY0R00 0 L17 ERJ3GEY0R00 0 R1 ERJ3GEYJ472 4 7K R2 ERJ3GEYJ472 4 7K R3 ERJ3GEYJ472 4 7K R4 ERJ3GEYJ330 33 R5 ERJ3GEYJ471 470 R6 ERJ3GEYJ472 4 7K R7 ERJ3GEYJ330 33 R8 ERJ3GEYJ472 4 7K R9 ERJ3GEYJ472 4 7K R10 ERJ3GEYJ472 4 7K R11 ERJ3GEYJ472 4 7K R12 ERJ3GEYJ472 4 7...

Page 41: ...41 ...

Page 42: ... 3K R60 ERJ3GEYJ151 150 R67 ERJ3GEYJ222 2 2K R68 ERJ3GEYJ222 2 2K R69 PQ4R18XJ3R3 3 3 R83 ERJ3GEYJ104 100K R84 ERJ3GEYJ103 10K R85 ERJ3GEYJ103 10K R86 ERJ3GEYJ103 10K R87 ERJ3GEYJ104 100K R88 ERJ3GEYJ333 33K R89 ERJ3GEYJ223 22K R90 ERJ3GEYJ183 18K R91 ERJ3GEYJ103 10K R92 ERJ3GEYJ105 1M R93 ERJ3GEYJ223 22K R94 ERJ3GEYJ223 22K R95 ERJ3GEYJ223 22K R96 ERJ3GEYJ223 22K R97 ERJ3GEYJ223 22K R98 ERJ3GEYJ2...

Page 43: ...43 ...

Page 44: ...J3GEYJ103 10K R141 ERJ3GEYJ271 270 R144 ERJ3GEYJ330 33 R145 ERJ3GEYJ330 33 R146 ERJ3GEYJ330 33 R147 ERJ3GEYJ330 33 R148 ERJ3GEYJ330 33 R149 ERJ3GEYJ330 33 R150 ERJ3GEYJ330 33 R151 ERJ3GEYJ330 33 R152 ERJ3GEYJ330 33 R153 ERJ3GEYJ330 33 R160 ERJ3GEYJ104 100K CAPACITORS C2 ECEV1HA2R2N 2 2 C3 PSCEV1HA010 1 C4 ECUV1H680JCV 68P C5 ECUV1H101JCV 100P C6 ECUV1H680JCV 68P C7 ECUV1H101JCV 100P C8 ECUV1H470JC...

Page 45: ...1000 C62 PQCUV1E104MD 0 1 C63 PSCEV1HA100 10 C71 PQCUV1E473MD 0 047 S C72 PQCUV1E473MD 0 047 S C73 PSCEV1EA4R7 4 7 C74 PQCUV1E104MD 0 1 S C78 ECUV1E102JCV 0 001 C79 ECUV1E102JCV 0 001 C80 PSCEV1HA010 1 C82 PSCEV0JA101 100 C83 PSCEV0JA101 100 C84 PSCEV0JA220 22 C85 ECUV1H683MD 0 68 C88 PSCEV1HA100 10 C89 PSCEV0JA220 22 C106 PSCEV0JA101 100 C107 PSCEV0JA101 100 C108 ECUV1H471JCV 470P C111 ECUV1H104Z...

Page 46: ...2K R205 PQ4R10XJ393 39K R206 PQ4R10XJ104 100K R207 PQ4R10XJ391 390 R208 PQ4R10XJ102 1K CAPACITORS C200 PQCUV1E104MD 0 1 S OTHERS E1 L5ADBKD00002 LIQUID CRYSTAL DISPLAY E2 PSSE1011Z CONNECTOR E3 PSHR1132Y GUIDE 14 5 SWITCH BOARD PARTS Ref No Part No Part Name Description Remarks PCB3 PSWP3T7431UK SWITCH BOARD ASS Y RTL SWITCH SW301 PSSRCA101Z SWITCH JOG DIAL CONNECTOR CN301 PSJS03Q36Z CONNECTOR 3P ...

Page 47: ...VING Q3 Q12 Q13 Q18 LED D100 130 5V RESET HOOK SW x2 12 288 MHz x1 5V Main p c board DATA COMMUNI CATION IC11 Q1 Q2 DC DC CONVERTER IC9 T1 POWER REGULATOR D1 IC10 IC7 5V 5V 16 384 MHz RX 1AP TX RX TEL JACK JK1 PBX TX INT RD WT A0 A1 D0 D3 INT RD WT ALE D5 D7 RR RD RB RR RD RB IC2 TEL Communication LSI CODEC D A A D SP Phone CIRCUIT HANDSET CIRCUIT TONE GENELATOR DPITS communi cation LED Control JO...

Page 48: ...1 5 2 6 3 7 4 8 ...

Page 49: ...9 13 10 14 11 15 12 16 ...

Page 50: ...17 21 18 22 19 23 20 24 ...

Page 51: ...33 34 35 36 25 32 ...

Page 52: ... R44 R46 D11 D129 D126 R124 R125 R126 CO6 D128 3 D127 TRANS D104 CO23 D110 CO17 D116 CO11 D122 CO5 PAUSE MW MUTE AUTO FLASH D103 CO22 D109 CO16 D115 CO10 D121 CO4 D125 D124 PROG HOLD REDIAL D101 CO20 D107 CO14 D113 CO8 D119 CO2 CONF D130 D100 CO19 D106 CO13 D112 CO7 D118 CO1 INT D102 CO21 D108 CO15 D114 CO9 D120 CO3 FWD DND SP PHONE 6 9 2 5 8 0 1 4 7 ...

Page 53: ...7 R16 C111 A7 A8 R26 R132 R131 Q12 Q11 R25 R24 R23 A5 Q10 C113 C112 R121 R139 R100 R99 F8 E2 E3 E4 B6 E1 CN2 IC6 33 48 16 1 32 49 R96 R97 F7 17 64 2 1 36 35 R22 R19 R18 R21 R20 Q8 Q3 Q9 Q6 Q18 B1 B4 A3 A4 Q17 Q15 Q14 Q13 Q16 Q5 Q4 L5 R144 R149 C116 R134 R115 L11 64 A6 Q7 L16 L15 L14 R6 C7 C5 R1 C4 X1 L12 R28 32 17 C18 R2 CN5 R113 R160 C17 R3 C8 R7 R4 R5 T1 7 8 6 10 1 5 Q24 B2 A1 A2 SW1 R116 Q32 JP...

Page 54: ... 59 VCC 58 SEL 57 RA1 56 RA0 55 R93 54 R92 53 R91 52 R90 51 R83 50 R82 49 R81 48 R80 47 R73 46 R72 45 R71 44 R70 43 R63 42 R62 41 R61 40 R60 39 R43 38 R42 37 R41 36 R40 35 R31 34 R32 33 R33 17 D11 18 D12 19 D13 20 R0 21 R01 22 R02 23 R03 24 R10 25 R11 26 R12 27 R13 28 R20 29 R21 30 R22 31 R23 32 R30 1 RE0 2 TEST 3 OSC1 4 OSC2 5 RESET 6 X1 7 X2 8 GND 9 D0 10 D1 11 D2 12 D3 13 D4 14 D5 15 D9 16 D10 ...

Page 55: ...4 18K D101 R38 2 2K C118 0 1 C14 50V1µ R43 1K Q6 R8 4 7K R121 100 5V V1 5V V2 C32 6 3V22µ D113 R56 39 R138 100K C116 IC2 D5V1 15 DG1 12 D5V2 31 DG2 28 P S 10 TEST 45 RXD 22 TXD 23 BCLK 25 HCLK 26 OSC1 29 APMN 60 APNP 1 APNO 59 H1 47 SPO 8 AP1MN 55 AP1MP 56 AP1MO 54 M1 49 AP2MO 52 AP2MI 53 VREFM 57 VBB 48 OP7 21 OP6 20 OP5 19 OP4 18 OP3 17 OP2 16 OP1 14 OP0 13 RESET 11 CE DOE 32 A5V1 6 AG1 3 A5V2 7...

Page 56: ...MENU1 MENU2 MENU3 SHIFT D202 R207 C200 C201 R201 R202 R203 R204 R205 R206 R208 D201 CN201 IC201 SW1 GND 5V 1 1 30 51 80 31 50 100 81 2 35 36 IC202 41 64 1 24 65 80 40 25 ...

Page 57: ...SW301 CN301 1 2 3 ...

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