Panasonic KX-TG4011AGT Service Manual Download Page 31 | Manualshive

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KX-TG4011AGT/KX-TG4012AGT/KX-TG4013AGT/KX-TGA403AGT

10 Troubleshooting Guide

10.1. Troubleshooting Flowchart

Cross Reference:

Check Power

(P.31)

Check Battery Charge

(P.32)

Check Link

(P.33)

Check the RF part

(P.35)

Check Handset Transmission

(P.40)

Check Handset Reception

(P.40)

Check Caller ID

(P.40)

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Summary of Contents for KX-TG4011AGT

Page 1: ...violation of law of law ORDER NO KM41009270CE ORDER NO KM41009270CE Telephone Equipment Telephone Equipment Model No Model No KX TG4011AGT KX TG4011AGT KX TG4012AGT KX TG4012AGT KX TG4013AGT KX TG4013AGT KX TGA403AGT KX TGA403AGT Expandable Digital Cordless Phone Expandable Digital Cordless Phone T Black Metallic Version T Black Metallic Version for Argentina for Argentina ...

Page 2: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT ...

Page 3: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT ...

Page 4: ... LCD 44 44 12 12 Measurement Measurements and s and Adjustment Adjustments s 45 45 12 1 12 1 Equipment Equipment Required Required 45 45 12 2 12 2 The Setting Method of The Setting Method of JIG JIG 45 45 12 3 12 3 Adjustment Adjustment St Standard Base andard Base Unit 49 Unit 49 12 4 12 4 Adjustment Adjustment St Standard Charger andard Charger Unit 50 Unit 50 12 5 12 5 Adjus Adjustmen tment t S...

Page 5: ...f 3 Dispose of used batteries according to used batteries according to the manufacture s Instructions the manufacture s Instructions 2 2 2 2 Ab Abou out L t Lea ead F d Fre ree S e Sol olde der r Pb PbF F Pb Pb fr free ee Note Note In the information below Pb the symbol for lead in the periodic table of elements will refer to standard solder or solder that In the information below Pb the symbol fo...

Page 6: ... 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 3 mm 0 6 mm and 1 0 mm 2 3 Discarding of P C Board When discarding P C Board delete all personal information such as ...

Page 7: ...KX TGA403AGT 3 Specifications Note Design and specifications are subject to change without notice Note for Service Operation range Up to 300 m outdoors Up to 50 m indoors depending on the condition Analog telephone connection Telephone Line ...

Page 8: ...e 10 ms of voice data is transmitted 2 Handsets Link Traffic Bearer A link is established between base unit and handset The state where duplex communication is performed Handset doesn t make up duplex in no free RF channels because of interference 1 Dummy Bearer Base unit sends Dummy data to the all stand by state handsets Handsets receive that data for synchronization and monitoring request from ...

Page 9: ...s it to digital data RXDATA BBIC IC1 converts RXDATA into a voice signal and outputs it to speaker Transmission A voice signal from microphone is encoded to digital data TXDATA by BBIC IC1 in a handset Then TXDATA goes to RF PART and it s modulated to 1 9 GHz The RF signal is amplified and fed to a antenna As for a base unit RF RF signal is received in two antennas BBIC IC501 compares RF signal le...

Page 10: ...T H O O K B E L L Q 1 1 1 L I N L O U T R F _ P A R T H S M I P H S M I N I C 5 0 1 B B I C I N U S E D E T E C T 2 I N U S E D E T E C T 1 R E C E I V E A M P D C I N 1 D C I N 2 I C 3 0 2 V C C P A V B A T _ A P U V B A T V C C _ F E V C C _ I F V C C _ V C O P D N D E T 3 0 V D O U B O U T S C L S D A W P I C 6 1 1 E E P R O M M E M O R Y R 1 5 1 R 1 5 2 R 1 3 1 R 1 3 3 Q 1 7 1 V B A T K E Y 1 ...

Page 11: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT 4 3 Block Diagram Base Unit_RF Part KX TG4011 4012 4013 BLOCK DIAGRAM Base Unit_RF Part DA801 ANT2 ANT1 TXON RXON RXp RXn ANT2 ANT1 TXp TXn ...

Page 12: ...C501 DTMF Generator When the DTMF data from the handset is received the DTMF signal is output Caller ID demodulation The BBIC implements monitor and demodulate the FSK DTMF signals that provide CID information from the Central Office Digital Switching The voice signal from telephone line is transmitted to the handset or the voice signal from the handset is transmitted to the Telephone line etc The...

Page 13: ...3AGT KX TGA403AGT 4 4 3 Power Supply Circuit Reset Circuit The power supply voltage from AC adaptor is converted to VBAT 3 0V in IC302 And 3 0V for peripherals and analog part is insulated from VBAT by Doubler of BBIC Circuit Operation ...

Page 14: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT 4 4 3 1 Charge Circuit The voltage from the AC adaptor is supplied to the charge circuits ...

Page 15: ...11 Q111 BBIC pin 5 BELL When the CPU BBIC detects a ring signal Q141 turns on thus providing an off hook condition active DC current flow through the circuit Following signal flow is the DC current flow T L101 D101 Q141 Q161 R163 R167 D101 L102 P101 R ON HOOK Circuit Q141 is open Q141 is connected as to cut the DC loop current and to cut the voice signal The unit is consequently in an on hook cond...

Page 16: ...k by detecting changes in the T R voltage Circuit Operation Parallel connection detection when on hook When on hook the voltage is monitored at pin 17 of IC501 There is no parallel connection if the voltage is 0 54 V or higher while a parallel connection is deemed to exist if the voltage is lower Parallel connection detection when off hook When off hook the voltage is monitored at pin 18 of IC501 ...

Page 17: ...a for the caller ID from the telephone exchange is sent during the interval between the first and second rings of the bell signal The data from the telephone exchange is a modem signal which is modulated in an FSK Frequency Shift Keying format Data 1 is a 1200 Hz sine wave and data 0 is a 2200 Hz sine wave There are two types of the message format which can be received i e the single message forma...

Page 18: ... customer is alerted to the new call so he she can use this information to decide whether to take the new call Function The telephone exchange transmits or receives CAS and ACK signals through each voice RX TX route Then FSK data and MARK data pass the following route Telephone Line P101 L101 L102 C121 C122 R121 R122 IC501 25 24 If the unit deems that a telephone connected in parallel is in use AC...

Page 19: ...ET CHG_CTL CHG_DET W P C L K D A T A P 3 _ 3 P 3 _ 7 P 1 _ 1 P 1 _ 4 CHARGE Q4 D7 MIC Receiver LED 3V Monitor SP LCD KEYS IC801 RF PART ANT1 X1 10 368 MHz EEPROM 3V BATTERY BELL BATTERY 3V BATTERY 3V KX TGA403 BLOCK DIAGRAM Handset KEY_LED Q7 LED KEY TXn Power_adj TXp VDD_PADRV PSEL PON TXON RXON RF_RXn RF_RXp CP_VOUT2 BATTERY VDDPA 1 8V VDD2 VDD1 3V Q2 1 8V C144 D1 ...

Page 20: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT 4 6 Block Diagram Handset_RF Part KX TGA403 BLOCK DIAGRAM Handset_RF Part DA801 TXON RXON ANT RF_RXn RF_RXp ...

Page 21: ...nal All interfaces ex Key Detector Circuit Charge DC DC Converter EEPROM LCD RF Power Amp PLL Oscillator Detector Compress Expander Reception RF Power Amp IC801 Amplifier for transmission EEPROM IC3 Temporary operating parameters for RF etc 4 7 2 Power Supply Circuit Reset Circuit Circuit Operation When power on the Handset the voltage is as follows BATTERY 2 2 V 2 6 V BATT F1 Q2 1 8 V IC1 43pin 2...

Page 22: ... The charge current is controlled by switching Q9 of Handset Refer to Fig 101 in Power Supply Circuit Reset Circuit P 12 4 7 4 Battery Low Power Down Detector Circuit Operation Battery Low and Power Down are detected by BBIC which check the voltage from battery The detected voltage is as follows Battery Low Battery voltage V Batt 2 25 V 50 mV The BBIC detects this level and starts flashing Power D...

Page 23: ...ration Charger Unit Charge control is executed at handset side so that the operation when using charger is also controlled by handset Refer to Circuit Operation Handset P 20 The route for this is as follows DC pin of J1 F1 R1 CHARGE pad Handset CHARGE pad DC pin of J1 ...

Page 24: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT 4 9 Signal Route RF part signal route ...

Page 25: ... Operating Instructions Instruction book on TSN Server 6 Installation Instructions Refer to the Operating Instructions Note You can download and refer to the Operating Instructions Instruction book on TSN Server 7 Operating Instructions Refer to the Operating Instructions Note You can download and refer to the Operating Instructions Instruction book on TSN Server ...

Page 26: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT 8 Test Mode 8 1 Engineering Mode 8 1 1 Base Unit ...

Page 27: ...elow Items Address Default Data New Data Remarks Frequency 00 07 00 08 00 01 Use these items in a READ ONLY mode to confirm the contents Careless rewriting may cause serious damage to the computer system ID 00 02 00 06 Given value Desired Number hex Input Keys Desired Number hex Input Keys 0 0 A Flash 0 1 1 B Flash 1 C Flash 2 D Flash 3 E Flash 4 9 9 F Flash 5 ...

Page 28: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT 8 1 2 Handset ...

Page 29: ...confirm the contents Careless rewriting may cause serious damage to the handset Items Address Default Data New Data Possible Adjusted Value MAX hex Possible Adjusted Value MIN hex Remarks Battery Low 00 11 00 12 00 00 2 Frequency 00 07 00 08 00 01 ID 00 02 00 06 Given value Desired Number hex Input Keys Desired Number hex Input Keys 0 0 A Flash 0 1 1 B Flash 1 C Flash 2 D Flash 3 E Flash 4 9 9 F F...

Page 30: ...TGA403AGT 9 Service Mode 9 1 How to Clear User Setting Handset Only Handset Press simultaneously until a beep sound is heard Then single handset is initialized The contents of user setting are reset to factory default Usage time is not cleared ...

Page 31: ...GA403AGT 10 Troubleshooting Guide 10 1 Troubleshooting Flowchart Cross Reference Check Power P 31 Check Battery Charge P 32 Check Link P 33 Check the RF part P 35 Check Handset Transmission P 40 Check Handset Reception P 40 Check Caller ID P 40 ...

Page 32: ...Base Unit Cross Reference Power Supply Circuit Reset Circuit P 12 Note BBIC is IC501 1 Refer to Specifications P 6 for part number and supply voltage of AC adaptor 2 Refer to Circuit Board Base Unit_Main P 69 10 1 1 2 Handset Cross Reference Power Supply Circuit Reset Circuit P 20 ...

Page 33: ...G4013AGT KX TGA403AGT 10 1 2 Check Battery Charge 10 1 2 1 Base Unit Cross Reference Charge Circuit P 13 10 1 2 2 Handset Cross Reference Check Power P 31 Charge Circuit P 21 10 1 2 3 Charger Unit Cross Reference Charge Circuit P 21 ...

Page 34: ...Check the RF part P 35 Note 1 How to adjust 3 0V Execute the command VDA Refer to Things to Do after Replacing IC or X tal P 52 for Base Unit 2 How to adjust the frequency of X501 To see the frequency execute the command SFR then check the TP_CKM IC501 57pin To adjust frequency send command SFR until the frequency counter becomes13 824 MHZ 55HZ ...

Page 35: ...et Circuit P 20 Check the RF part P 35 Note 1 How to adjust the frequency of X1 To see the frequency execute the command SFR then check the TP_CKM IC1 46pin To adjust frequency send command SFR until the frequency counter becomes10 368 MHz 55HZ Refer to Things to Do after Replacing IC or X tal P 53 for Handset ...

Page 36: ...GT KX TGA403AGT 10 1 4 Check the RF part 10 1 4 1 Finding out the Defective part After All the Checkings or Repairing 1 Re register the checked handset to the checked base unit and Regular HS to Regular BU Note 1 HS Handset 2 BU Base Unit ...

Page 37: ...GT KX TG4012AGT KX TG4013AGT KX TGA403AGT 10 1 4 2 RF Check Flowchart Each item 1 6 of RF Check Flowchart corresponds to Check Table for RF part P 37 Please refer to the each item Note 1 Refer to Check Link P 33 ...

Page 38: ... 1 and RXDATA waveform of Regular HS by Digital Oscilloscope 1 Place Regular BU 15 cm away from a checked HS 2 Confirm TXDATA waveform of HS 2 and RXDATA waveform of Regular BU by Digital Oscilloscope 4 RX confirmation Regular HS BU Mode Test TX_Burst Mode BU HS Mode Test RX Mode 1 Place Regular HS 15 cm away from a checked BU 2 Confirm RXDATA waveform of BU 1 and TXDATA waveform of Regular HS by ...

Page 39: ...ART1 3 At distance of about 20m between HS and BU Link OK TX Power of the HS is OK No Link TX Power of the HS is NG Range Confirmation RX TEST RX sensitivity check HS BU setting Checked unit High TX power 1 Regular unit Low TX power 1 1 Register Regular HS to BU to be checked 2 Set TX Power of the BU and the Regular HS according to CHART1 3 At distance of about 20m between HS and BU Link OK RX Sen...

Page 40: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT 10 1 5 Registering a Handset to the Base Unit 10 1 6 Deregistering a Handset 10 1 7 Deregistering All Handsets by the Base Unit ...

Page 41: ...e P 23 Note When checking the RF part Refer to Check the RF part P 35 10 1 10 Check Caller ID Cross Reference Telephone Line Interface P 14 Calling Line Identification Caller ID P 16 Note Make sure the format of the Caller ID service of the Telephone company that the customer subscribes to It is also recommended to confirm that the customer is really a subscriber of the service ...

Page 42: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT 11 Disassembly and Assembly Instructions 11 1 Disassembly Instructions 11 1 1 Base Unit ...

Page 43: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT 11 1 2 Handset ...

Page 44: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT 11 1 3 Charger Unit ...

Page 45: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT 11 2 How to Replace the Handset LCD Note The illustrations are simplified in this page They may differ from the actual product ...

Page 46: ...recommended This equipment may be useful in order to precisely adjust like a mass production 12 2 The Setting Method of JIG Preparation Serial JIG cable PQZZ1CD300E PC which runs in DOS mode Batch file CD ROM for setting PNZZTG4011AG Note If you have the JIG Cable for TCD500 series PQZZ1CD505E change the following values of resistance Then you can use it as a JIG Cable for both TCD300 and TCD500 s...

Page 47: ...A403AGT 12 2 2 Connections Handset Connect the DC Power or Battery to BATT and BATT Connect the JIG cable GND black to GND Connect the JIG cable UTX yellow to UTX and URX red to URX Note COM port names may vary depending on what your PC calls it ...

Page 48: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT 12 2 3 How to install Batch file into P C Note varies depending on the country or models ...

Page 49: ...se NEVER forget these 4 byte data sendchar epw Write EEPROM Type sendchar epw 03 e2 04 FF FF FF FF sendchar RST Reset baseset Type sendchar RST getchk Read checksum Type getchk sendchar epw Write EEPROM Type sendchar epw 03 e2 04 WW XX YY ZZ WW XX YY ZZ is 4 byte data that already read from same address getchk Write the data of EEPROM Type reeprom 01 23 45 01 23 is address and 45 is data to be wri...

Page 50: ...L 4 7 6 L 4 7 4 L 3 7 2 L 3 6 2 I C 6 0 1 I C 3 0 2 I C 6 1 1 R A 1 5 1 R A 5 0 4 D 3 6 1 D 4 7 3 D 4 7 2 D 1 5 3 D 1 3 3 D 3 6 3 Q 1 6 1 Q 6 0 1 C 1 4 2 C 5 1 3 C 1 6 7 C 5 1 2 C 1 8 6 C 1 8 4 C 6 0 1 C 4 7 9 C 3 0 7 C 3 0 1 C 3 3 2 C 5 2 1 C 1 3 3 C 1 2 3 C 4 7 2 C 4 7 3 C 4 7 5 C 1 2 0 C 1 2 4 C 1 5 1 C 5 2 5 C 5 2 4 C 6 1 1 C 1 1 5 C 1 6 8 C 1 2 6 C 6 6 1 R 1 6 5 F 3 0 1 D C P D C M R 5 1 2 R ...

Page 51: ...tandard Charger Unit When connecting the simulator equipment for checking please refer to below 12 4 1 Bottom View T P 4 T P 3 1 2 J1 A F 1 P b F P N L P 1 0 2 9 Y A P Q U P 1 1 5 3 2 Y C h a r g e C h a r g e 12 2 W Digital Volt Meter DC POWER DC 6 5 V T P 3 T P 4 G N D ...

Page 52: ... C 8 8 1 C 8 1 9 C 4 5 C 4 6 C 8 2 5 C 8 0 9 C 8 1 0 C 8 6 1 C 8 08 C 8 1 2 C 8 0 6 C 1 3 8 C 1 3 9 C 8 0 3 C 8 0 5 C 4 7 C 8 2 2 C 8 2 6 C 8 2 0 C 8 6 0 C 1 8 2 C 4 9 C 5 0 C 1 8 8 C 1 2 C 1 3 C 1 1 C 9 6 C 1 8 C 1 7 C 9 7 C 3 8 C 3 5 C 1 2 1 C 1 5 0 C 1 C 2 C 1 7 2 C 7 5 C 7 4 C 3 X 1 M I C R 2 3 2 R 5 5 S P E A K E R R 2 3 3 R 8 0 6 R 6 4 R 2 8 R 4 0 3 R 4 0 4 R 4 0 6 R 4 0 7 R 4 0 1 R 2 1 5 R ...

Page 53: ...thod of JIG P 45 Items How to download Required adjustment EEPROM IC611 Adjusted parameter data is stored in memory country version batch file default batch file etc 1 Change the address 0001 of EEPROM to 55 to download the data 2 Default batch file Execute the command default bat 3 Country version batch file Execute the command TG4011USAGrevXXX_YYY bat 1 4 Clock adjustment X tal X1 System clock C...

Page 54: ...endchar LED 0 sendchar CRX 0 1 sendchar AD1 It assumes that the return value is XX a 6c XX 71 No need to adjust b XX 6A 6B Need to adjust XX 72 74 Need to adjust Write AD value of 2 25 V to EEPROM ex read data XX 6A write data YY 6A read data XX 73 write data YY 73 EEPROM 0009 Low Voltage write YY Execute the command wreeprom 00 09 01 YY EEPROM 000A No Voltage write YY 1D Execute the command xwree...

Page 55: ...G4012AGT KX TG4013AGT KX TGA403AGT 12 7 Frequency Table CH Ch hex Frequency MHz 0 00 1928 448 1 01 1926 720 2 02 1924 992 3 03 1923 264 4 04 1921 536 5 05 1919 808 6 06 1918 080 7 07 1916 352 8 08 1914 624 9 09 1912 896 ...

Page 56: ...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 P 4 13 1 2 How to Remove the IC 1 Put plenty of solder on the IC pins so that the pins can be completely covered Note If the IC pins are not soldered enough you may give pressure to the P C board when cutting the pins with a cutter 2 Make...

Page 57: ...accuracy of the IC setting with the corresponding soldering foil 2 Apply flux to all pins of the FLAT PACKAGE IC 3 Solder the pins sliding the soldering iron in the direction of the arrow 13 1 4 How to Remove a Solder Bridge 1 Lightly resolder the bridged portion 2 Remove the remaining solder along the pins using a soldering iron as shown in the figure below ...

Page 58: ...t Air Desoldering Tool Temperature 608 F 68 F 320 C 20 C 13 2 2 Caution To replace the IC efficiently choose the right sized nozzle of the hot air desoldering tool that matches the IC package Be careful about the temperature of the hot air desoldering tool not to damage the PCB and or IC 13 2 3 How to Remove the Shield Case Note If you don t have special tools ex Hot air disordering tool conduct t...

Page 59: ...G4013AGT KX TGA403AGT 13 2 4 How to Install the Shield Case Note If you don t have special tools ex Hot air disordering tool conduct the following operations Shield case s No PNMC1013Z 1 Put the shield case 2 Solder the surroundings ...

Page 60: ...F 320 C 20 C 13 3 2 Caution To replace the IC efficiently choose the right sized nozzle of the hot air desoldering tool that matches the IC package Be careful about the temperature of the hot air desoldering tool not to damage the PCB and or IC 13 3 3 How to Remove the IC 1 Heat the IC with a hot air desoldering tool through the P C Board 2 Pick up the IC with tweezers etc when the solder is melte...

Page 61: ...lacing the IC the positioning should be done very carefully 3 Heat the IC with a hot air desoldering tool through the P C Board until the solder on IC bottom is melted Note Be sure to place it precisely controlling the air volume of the hot air desoldering tool 4 After soldering confirm there are no short and open circuits with visual inspection 13 3 5 How to Remove a Solder Bridge When a Solder B...

Page 62: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT 13 4 Terminal Guide of the ICs Transistors and Diodes 13 4 1 Base Unit 13 4 2 Handset ...

Page 63: ...d at any time with the development of new technology 14 1 2 Handset Schematic Diagram Handset_Main Notes 1 DC voltage measurements are taken with an oscilloscope or a tester with a ground 2 The schematic diagrams may be modified at any time with the development of new technology 14 1 3 Charger Unit Schematic Diagram Charger Unit Notes 1 DC voltage measurements are taken with voltmeter from the neg...

Page 64: ...KX TG4011AGT KX TG4012AGT KX TG4013AGT KX TGA403AGT Memo ...

Page 65: ... RXn ANT1 TXp TXn RXp GND STM CKM P15 GND GND GND GND CL1 CL2 Q651 NC 1 B1 2 E 3 B2 5 C1 4 C2 C893 3p GND GND GND GND T D I T M S T C K T D O C895 1 2p C896 2 2p C859 2 2p C805 2 7p C806 2 7p C820 1 5p C 8 6 3 1 5 p R 5 0 2 3 3 R T C K C 6 6 0 N C C810 2 4p C 8 1 3 2 p L809 7 5n C891 5p C892 5p C811 10p C826 10p C822 10p C825 10p C 6 5 3 N C C 6 5 4 N C C812 0 9p C827 10p GND C894 2 2p R651 NC R65...

Page 66: ...OM 1 A0 2 A1 3 A2 4 GND 5 SDA 6 SCL 7 WP 8 VCC R136 NC CHG 2 CHG 2 D 3 6 3 N C A K GND C 3 2 1 1 u Q161 B C E C502 10u C505 10u C 5 1 1 1 0 u C 3 4 1 3 3 0 u ZA1 1 2 6 7 9 11 3 4 5 8 10 12 C 4 7 2 N C C 4 7 5 N C C 4 7 3 N C C 5 3 0 1 0 p C 3 0 7 N C C 5 2 2 1 0 p C 3 4 3 1 0 p C 5 2 3 N C C524 NC C 5 2 5 N C R 1 7 6 1 0 0 R172 100k C175 1000p R160 910 C 1 7 8 0 0 2 2 u C 1 6 1 1 0 u C 1 7 6 1 0 u...

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