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Panasonic KX-T7665NE, Service Manual, Page: 18 / 47

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Panasonic KX-T7665NE Service Manual Download Page 18

10.6. DATA COMMUNICATION

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

Circuit Operation
The data received from PBX is inputted to the comparator (pin 36) built in IC2 through Pulse 
Trans T1. The threshold voltage of the comparator is determined by R101 to 103 and inputted to 
pin 37 and 35 of IC2.
The data to PBX is outputted from pin 38 and 39 of IC2, drives T1 by Transistor Q1 and 
transmitted.

18

Summary of Contents for KX-T7665NE

Page 1: ...ORTANT INFORMATION ABOUT LEAD FREE PbF SOLDERING If lead free solder was used in the manufacture of this product the printed circuit boards will be marked PbF Standard leaded Pb solder can be used as usual on boards without the PbF mark When this mark does appear please read and follow the special instructions described in this manual on the use of PbF and how it might be permissible to use Pb sol...

Page 2: ...10 C In case of using high temperature soldering iron please be careful not to heat too long PbF solder will tend to splash if it is heated much higher than its melting point approximately 1100 F 600 C If you must use Pb solder on a PCB manufactured using PbF solder remove as much of the original PbF solder as possible and be sure that any remaining is melted prior to applying the Pb solder When a...

Page 3: ...ng 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 3 SPECIFICATIONS Station Loop Limit 90 ohms Calling Method 2 pair wire Jacks Handset Jack TEL Jack Dimensions Low Angle High Angle 213 D mm 177 W mm 107 H mm 201 ...

Page 4: ...4 ...

Page 5: ...ONNECTION Caution The availability of D XDP function depends on the software version of the connected Business Telephone System Consult your dealer for more details about D XDP 6 DISASSEMBLY INSTRUCTIONS 5 ...

Page 6: ...1 Remove the Stand 2 Remove 5 Screws A 3 Remove the Cabinet Cover 6 ...

Page 7: ... C Note We recommend a 30 to 40 Watt soldering iron An expert may be able to use a 60 to 80 Watt iron where someone with less experience could overheat and damage the PCB foil Flux Recommended Flux Specific Gravity 0 82 Type RMA lower residue non cleaning type Note See ABOUT LEAD FREE SOLDER PbF Pb free 7 2 PROCEDURE 1 Tack the flat pack IC to the PCB by temporarily soldering two diagonally opposi...

Page 8: ...oldering iron along the tips of the pins while feeding enough solder to the tip so that it flows under the pins as they are heated 7 3 REMOVING SOLDER FROM BETWEEN PINS 1 Add a small amount of solder to the bridged pins 2 With a hot iron use a sweeping motion along the flat part of the pin to draw the solder from between the adjacent pads 8 TROUBLESHOOTING GUIDE 8 ...

Page 9: ...8 1 NO OPERATION Note Refer to 1 4 of WAVEFORM for waveform 8 2 LCD DOES NOT OPERATE 9 ...

Page 10: ...Note Refer to 5 of WAVEFORM for waveform 8 3 HANDSET DOES NOT WORK Receive Send 10 ...

Page 11: ...Note Refer to 6 7 of WAVEFORM for waveform 8 4 SPEAKER PHONE TROUBLE Receive Send 11 ...

Page 12: ...er to 8 of WAVEFORM for waveform 9 BLOCK DIAGRAM 10 CIRCUIT OPERATIONS 10 1 KEY INPUT CONTROL CIRCUIT The key data is under the matrix control by 20 to 23 KEYOUT and 28 to 35 KEYIN of IC6 The key information outputted from KEYOUT is inputted into KEYIN when the key is pressed 12 ...

Page 13: ...s output from pins 52 to 58 of IC6 LCD contrast adjustment is performed by the circuit composed of R603 and R604 The contrast is determined only by the voltage level between pin 2 and pin 3 of CN5 Higher potential makes the contrast high 13 ...

Page 14: ...LCD Contrast Control CONTRAST IC6 Pin 59 IC6 Pin19 HIGH L L MIDDLE Z L LOW Z Z 14 ...

Page 15: ...10 3 LED CIRCUIT The lighting of the LED is controlled by pin 14 to 18 Row and pin 8 to 13 Colum of IC2 The LED lights up in a dynamic lighting system The duty ratio is 1 8 ON time 1 5ms 15 ...

Page 16: ...10 4 RESET CIRCUIT Reset Signal is outputted from IC7 and inputted into IC2 IC3 and IC6 at the connection of TEL cord 16 ...

Page 17: ...er supply voltage of 3 3V by IC1 Switching Regulator IC Q22 and Q23 control the power supply circuit as below to turn IC1 on in low consumption current at starting up Input Voltage approx 26V or less Q23 OFF Q22 ON IC1 pin 3 H IC1 OFF Input Voltage approx 26V or more Q23 ON Q22 OFF IC1 ON 17 ...

Page 18: ...rol LCD control voice data etc This information is continuously exchanged at all times Circuit Operation The data received from PBX is inputted to the comparator pin 36 built in IC2 through Pulse Trans T1 The threshold voltage of the comparator is determined by R101 to 103 and inputted to pin 37 and 35 of IC2 The data to PBX is outputted from pin 38 and 39 of IC2 drives T1 by Transistor Q1 and tra...

Page 19: ...a from Slave DPT is inputted to the comparator pin 31 built in IC2 The threshold voltage of the comparator is determined by R112 to 114 and inputted to pin 30 and 32 of IC2 Also the supplying power to Slave DPT is controlled by a constant current circuit of Q16 as below IC2 pin 28 as H Constant current circuit ON IC2 pin 28 as L Constant current circuit OFF IC2 pin 29 as H 40mA Feeding Slave DPT u...

Page 20: ...D conversion Gain adjustment by IC4 inputted to IC3 and IC2 in PCM data then sent to PBX Receiving signal is inputted from PBX IC2 IC3 D A conversion after the input to IC4 in PCM data Gain adjustment by DSP of IC4 Pin 26 of IC4 outputted from Q51 to handset 2 Speakerphone Call The speakerphone mode can only provide a one way communication path IC3 compares transmitting signal and receiving signal...

Page 21: ...n sent to PBX Receiving signal is inputted from PBX is IC2 Gain adjustment by IC3 inputted to IC4 in PCM data D A conversion pin 24 of IC4 pin 27 of IC4 pin 28 of IC4 pin 29 of IC4 outputted from pin 3 and 4 of IC4 to speaker 11 IC DATA 11 1 IC2 21 ...

Page 22: ...2 16 NROW1 out LED Row 1 17 VSS GND 18 NROW0 out LED Row 0 19 OEP1 PN9 CK512K tri enable pulse 20 OSR in Built in 2 048MHz serial data input 21 OSX tri 2 048MHz serial data output 22 OEP0 tri enable pulse 23 VSS GND 24 VDD Vdd 25 OCLK bi 2 048MHz serial clock 26 OSYNC bi 8Khz FS 27 GOP0 out DXDP1 H 40mA L 20mA 28 GOP1 out DXDP2 H ON L OFF 29 TEST in TEST 30 DVRL in Comp Ref 31 DDR in Comp Input 32...

Page 23: ...OSO out OSC 49 VSS GND 50 ADR5 in Built in Add 5 51 ADR4 in Built in Add 4 52 ADR3 in Built in Add 3 53 ADR2 in Built in Add 2 54 ADR1 in Built in Add 1 55 ADR0 in Built in Add 0 56 VDD Vdd 57 DB7 bi Built in Data 7 58 DB6 bi Built in Data 6 59 DB5 bi Built in Data 5 60 DB4 bi Built in Data 4 61 DB3 bi Built in Data 3 62 DB2 bi Built in Data 2 63 DB1 bi Built in Data 1 64 DB0 bi Built in Data 0 11...

Page 24: ...1 I O LCD contrast 2 Cont H M L Cont L High Z 20 P14 I O Built in KEYOUT3 L output 21 P13 TMIG I O Built in KEYOUT2 L output 22 P12 TMOFH I O Built in KEYOUT1 L output 23 P11 TMOFL I O Built in KEYOUT0 L output 24 P10 TMOW O OSC for LCD Power 128kHz 4 096MHz 32 25 PA3 O side tone Cont H side tone ON 26 PA2 O ASIC REN Low active 27 PA1 O ASIC WEN Low active 28 P50 WKP0 I Built in KEYIN0 29 P51 WKP1...

Page 25: ...O EEPROM CLK 51 P77 I O EEPROM DATA 52 P80 O LCD_D7 53 P81 O LCD_D6 54 P82 O LCD_D5 55 P83 O LCD_D4 56 P84 O LCD_E 57 P85 O LCD_W 58 P86 O LCD_RS register select 59 P87 O LCD contrast 1 Cont H L Cont M L High Z 60 TONED O DTMF Tone Tone out 61 VTref I Tone reference 62 PB7 AN7 I for Test MODE connect D3V for Sp phone test 63 PB6 AN6 I not in use 64 CVcc I internal power source 12 TERMINAL GUIDE OF...

Page 26: ...13 CABINET AND ELECTRICAL PARTS LOCATION 26 ...

Page 27: ...14 ACCESSORIES AND PACKING MATERIALS 27 ...

Page 28: ...28 ...

Page 29: ...eriod the assembly will no longer be available 2 Important safety notice Components identified by mark have special characteristics important for safety When replacing any of these components use only manufacture s specified parts 3 The S mark means the part is one of some identical parts For that reason it may be different from the installed part 4 ISO code Example ABS HB of the remarks column sh...

Page 30: ...HB 7 PQAS57P03Z SPEAKER 8 PSJS02P15Z CONNECTOR 2 PIN 9 PSUS1026Z TORSION SPRING 10 PSBH1007Z1 PUSH BUTTON HOOK for KX T7665NE PC ABS HB S 10 PSBH1007Z2 PUSH BUTTON HOOK for KX T7665NE B PC ABS HB S 11 PSHG1122Z RUBBER PARTS MIC COVER 12 RJM142Z BUILTIN MICROPHONE S 13 PSJS02Q35Y CONNECTOR 2 PIN 14 PSBX1116Z1 PUSH BUTTON FUNCTION for KX T7665NE ABS HB S 14 PSBX1116Z2 PUSH BUTTON FUNCTION for KX T76...

Page 31: ...KING MATERIALS Ref No Part No Part Name Description Remarks A1 PSJA1068Z CORD TELEPHONE S A2 PSJA1084Z CORD HANDSET for KX T7665NE A2 PSJA1084X CORD HANDSET for KX T7665NE B A3 PQJXF0202Z HANDSET for KX T7665NE A3 PQJXF0222Z HANDSET for KX T7665NE B A4 PSYL1002Z3 STAND ASS Y for KX T7665NE PS HB A4 PSYL1002Z2 STAND ASS Y for KX T7665NE B PS HB A5 PSQW2038Z LEAFLET STAND A6 PSZE1036Z INSTRUCTION BO...

Page 32: ...CFCJ0001 TRANSISTOR SI Q33 PSVTUMX1NTN TRANSISTOR SI Q34 PSVTUMX1NTN TRANSISTOR SI Q35 PSVTUMX1NTN TRANSISTOR SI Q51 2SC4081R TRANSISTOR SI S Q52 2SC4081R TRANSISTOR SI S DIODES D1 PQVDS1ZB60F1 DIODE SI S D21 B0JCME000035 DIODE SI D31 PSVD1SRCT DIODE SI S D32 PQVDBRPY1204 DIODE SI S D33 PQVDBRPY1204 DIODE SI S D34 PQVDBRPY1204 DIODE SI S D35 PQVDBRPY1204 DIODE SI S D36 PQVDBRPY1204 DIODE SI S D37 ...

Page 33: ...2 5 6K R103 ERJ3GEYJ123 12K R104 ERJ3GEYJ182 1 8K R105 ERJ3GEYJ122 1 2K R106 ERJ3GEYJ121 120 R107 ERJ3GEYJ182 1 8K R108 ERJ3GEYJ101 100 R109 ERJ3GEYJ101 100 R110 ERJ3GEYJ122 1 2K R111 ERJ3GEYJ122 1 2K R112 ERJ3GEYJ562 5 6K R113 ERJ3GEYJ682 6 8K R114 ERJ3GEYJ103 10K R115 ERJ3GEYJ472 4 7K R116 ERJ3GEYJ153 15K R117 ERJ3GEYJ472 4 7K R119 ERJ3GEYJ822 8 2K R129 ERJ3GEYJ123 12K R130 ERJ3GEYJ220 22 R131 E...

Page 34: ...R400 ERJ3GEYJ821 820 R401 ERJ3GEYJ105 1M R402 ERJ3GEYJ473 47K R403 ERJ3GEYJ181 180 R406 ERJ3GEYJ473 47K R407 ERJ3GEYJ473 47K R500 ERJ3GEYJ102 1K R501 ERJ3GEYJ222 2 2K R502 ERJ3GEYJ103 10K R503 ERJ3GEYJ102 1K R504 ERJ3GEYJ103 10K R505 ERJ3GEYJ102 1K R506 ERJ3GEYJ222 2 2K R507 ERJ3GEYJ563 56K R508 ERJ3GEYJ822 8 2K R509 ERJ3GEYJ333 33K R510 ERJ3GEYJ473 47K R511 ERJ3GEYJ223 22K R512 ERJ3GEYJ274 270K R...

Page 35: ...V1A105ZFV 1 C110 ECUV1H101JCV 100P C111 ECUV1A105ZFV 1 C112 ECUV1H101JCV 100P C113 ECUV1C104ZFV 0 1 C114 ECUV1C104ZFV 0 1 C115 PQCUV1C105ZF 1 S C116 PQCUV1C105ZF 1 S C117 ECUV1A105ZFV 1 C118 PQCUV1C105ZF 1 S C119 ECUV1A105ZFV 1 C200 ECUV1C104ZFV 0 1 C201 ECUV1H181JCV 180P S C202 ECUV1H104ZFV 0 1 S C203 F2G1H3300004 33 C204 EEEFK0J471P 470 C205 EEEFK0J471P 470 C400 ECUV1C104ZFV 0 1 C401 ECUV1C104ZF...

Page 36: ...JY106 10 C525 ECST0JY106 10 C526 ECST0JY106 10 C527 ECUV1C104KBV 0 1 C528 ECUV1H103KBV 0 01 S C600 ECUV1C104ZFV 0 1 C601 ECUV1C104ZFV 0 1 C603 ECUV1C104ZFV 0 1 C604 ECUV1C104ZFV 0 1 C605 ECUV1C104ZFV 0 1 C606 ECUV1C104ZFV 0 1 C607 ECUV1C104ZFV 0 1 OTHERS E1 L5DAAGB00001 LIQUID CRYSTAL DISPLAY T1 ETJS13ZA14AB TRANSFORMER X1 PSVCC0025GT CRYSTAL OSCILLATOR S 16 FOR THE SCHEMATIC DIAGRAM Note 1 DC vol...

Page 37: ...17 SCHEMATIC DIAGRAM 18 WAVEFORM 19 PRINTED CIRCUIT BOARD MAIN BOARD 19 1 COMPONENT VIEW 19 2 BOTTOM VIEW NT1 KXT7665NE KXT7665NEB 37 ...

Page 38: ...munication Power IC1 Q21 L21 D3V A3V OSR OSX OEP0 OCK DX DR BCLK FS LED D32 D42 Q31 Q35 NROW0 3 CLM0 5 Key SW1 32 Hook SW JK3 Reset IC7 Speaker Phone IC3 3 3V 5 0V IC8 D63 CODEC IC4 CPU IC6 Tone DB0 7 ADR0 5 WEN REN INTN SCK DATA LCD D4 7 E W RS SCL SDA X1 LED D43 D44 MIC CN2 SP CN1 CN3 CN4 MAIN P C Board KX T7665NE KX T7665NE B BLOCK DIAGRAM ...

Page 39: ... 4 SPOP DR 10 FS 7 HANDR 26 TONE 30 MIC1 17 CSN 13 DATA 11 RAO 28 SPI 29 TEST 14 C515 C514 R512 R511 C506 C524 R505 R506 A3V AG AG C521 IC3 FS 2 TIN 4 RIN 3 VDD 7 VSS 8 TOUT 6 ROUT 5 DATA 11 SCLK 13 CSN 14 TEST1 15 RxON 9 TxON 10 RST 16 TEST2 12 BCLK 1 C522 D3V R515 D3V C525 R503 AG Q51 E C B AG AG NC C503 MIC1 SP1 AG1 SPP SPN MIC2 AG2 R406 D3V R518 R519 R520 R521 DG R516 DG R517 DG DG DG C523 DG ...

Page 40: ...06 Z10 C525 R503 1K AG Q51 E C B AG AG NC C503 D63 D62 D3V Z0 1 C604 D5V IC7 NC 3 Vss 4 Vin 2 Vout 1 SW33 MIC1 SP1 AG1 SPP SPN MIC2 AG2 IC6 64 CVcc 63 PB6 62 PB7 61 VTref 60 TONED 59 P87 58 P86 57 P85 56 P84 55 P83 54 P82 53 P81 52 P80 51 P77 50 P76 49 P75 48 P74 47 P73 46 P72 45 P71 44 P70 43 P67 42 P66 41 P65 40 P64 39 P63 38 P62 37 P61 36 P60 35 P57 34 P56 33 P55 17 P17 18 P16 19 P15 20 P14 21 ...

Page 41: ...4 1 6 2 D34 CO2 D39 CO6 D38 CO5 4 3 5 120 R309 4 3 5 D37 CO4 D35 CO8 A1 4 3 5 D32 CO1 12 R308 120 R307 D33 CO7 D42 STORE DG D3V R515 47K D3V Z0 1 C403 D3V Z0 1 C402 Z0 1 C401 Z0 1 C400 R401 1M R400 820 X1 16 384MHz 12P C404 12P C405 Z0 1 C407 JK1 1 H 2 R 3 T 4 L R204 3 9k 1k R300 1k R304 1k R301 1k R305 1k R302 1k R303 D31 SP 120 R310 180 R306 CN3 1 2 B6 B1 B4 B5 B3 B2 CN4 2 1 4 7 R313 D41 INTERCO...

Page 42: ... 2 3 1 Pin48 of IC2 16 384MHz Pin45 of IC2 8 196MHz Pin42 of IC2 and Pin8 of IC6 Rest signal Pin42 of IC2 and Pin8 of IC6 ...

Page 43: ... 5 6 4 Pin4 to 7 of CN5 Communication waveform Pin3 and 6 of IC3 PCM interface waveform between IC3 and IC2 Pin36 of IC2 Communication waveform ...

Page 44: ... 8 7 Pin31 of IC2 Communication waveform Pin8 and 10 of IC4 PCM interface waveform between IC4 and IC3 ...

Page 45: ...C601 C600 E4 IC8 D5V R607 IC5 R609 R608 C609 E3 JK2 R T G1 R610 33 48 1 17 32 49 64 1 CN3 R W 2 1 CN2 R200 C205 PSUP1439Z A 2 CN4 R312 B8 B9 B7 B10 R313 1 PbF F5 F7 A5 B1 B2 B3 R135 C120 D3V Q5 Q3 Q6 R139 R138 R133 R137 C204 R R W JK3 AG1 SP1 SPN SPP Q52 Q51 R504 IC4 IC3 Q23 C203 R206 R209 IC1 R208 R204 Q4 Q22 R207 Q21 C201 R202 L21 C504 C518 R514 R511 C528 R513 R518 MIC2 AG2 GND C516 R510 C509 C5...

Page 46: ... CO5 SW13 CO4 SW17 CO3 SW21 CO2 SW25 CO1 SW4 V DWN SW16 1 SW20 4 SW24 7 SW28 REDIAL SW32 FLASH SW30 HOLD SW31 SP SW29 PSUP1439Z B PbF HOOK SW SW15 2 SW19 5 SW23 8 SW27 0 SW14 3 SW3 MES SW18 6 SW22 9 SW26 D40 D42 D35 D33 D39 D38 D37 D36 D34 D32 D31 D44 D43 KX T7665NE KX T7665NE B MAIN BOARD BOTTOM VIEW ...

Page 47: ...3 R600 C601 C600 E4 IC8 D5V R607 IC5 R609 R608 C609 E3 JK2 R T G1 R610 33 48 1 17 32 49 64 1 CN3 R W 2 1 CN2 R200 C205 PSUP1439Z A PbF F5 F7 A5 B1 B2 B3 R135 C120 D3V Q5 Q3 Q6 R139 R138 R133 R137 C204 R JK3 AG1 SP1 SPN SPP Q52 Q51 R504 IC4 IC3 Q23 C203 R206 R209 IC1 R208 R204 Q4 Q22 R207 Q21 C201 R202 L21 C504 C518 R514 R511 C528 R513 R518 MIC2 AG2 GND C516 R510 C509 C511 C512 R509 C508 C507 R512 ...

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