Teclast X21 Service Manual Download

Page: 71 / 76

MATERIAL

CODE

MATERIAL NAME

SPECIFICATIONS

LOCATION

0090324 SMD RESISTOR

1/16W 0O±5% 0402

R51,R72,R73,R76

0090001 SMD RESISTOR

1/16W 0O±5% 0603

L26

0090326 SMD RESISTOR

1/16W 10O±5% 0402

L14,R31,R32,R33

0090644 SMD RESISTOR

1/16W 18O±5% 0402

L12,R42,R43

0090339 SMD RESISTOR

1/16W 100O±5% 0402

0090346 SMD RESISTOR

1/16W 220O±5% 0402

R56

0090349 SMD RESISTOR

1/16W 300O±5% 0402

R55

0090355 SMD RESISTOR

1/16W 510O±5% 0402

R69

0090362 SMD RESISTOR

1/16W 1K±5% 0402

R7,R44,R52,R53,R54,R67

0090369 SMD RESISTOR

1/16W 2.2K±5% 0402

R61

0090375 SMD RESISTOR

1/16W 3.9K±5% 0402

R77,R78

0090359 SMD RESISTOR

1/16W 750O±5% 0402

R68

0090377 SMD RESISTOR

1/16W 4.7K±5% 0402

R57,R63,R64

0090385 SMD RESISTOR

1/16W 10K±5% 0402

R8,R9,R25,R36,R45,R46,L16

0090396 SMD RESISTOR

1/16W 33K±5% 0402

R18,R28,R30

0090400 SMD RESISTOR

1/16W 47K±5% 0402

R14,R16,R58,R66

0090404 SMD RESISTOR

1/16W 68K±5% 0402

0090408 SMD RESISTOR

1/16W 100K±5% 0402

R10,R11,R12,R17,R24,R26,R38,R39,R40,R
47,R59,R62,R71

0090425 SMD RESISTOR

1/16W 470K±5% 0402

R15,R60

0090433 SMD RESISTOR

1/16W 1MO±5% 0402

R23,R34,R35

0090436 SMD RESISTOR

1/16W 2MO±5% 0402

R19,R65

0090443 SMD RESISTOR

1/16W 5.6MO±5% 0402

R13

0090639 PRECISION SMD RESISTOR

1/16W 1.5K±1% 0402

R37

0090672 PRECISION SMD RESISTOR

1/16W 20K±1% 0402

0090485 PRECISION SMD RESISTOR

1/16W 27K±1% 0402

R75

0090671 PRECISION SMD RESISTOR

1/16W 33K±1% 0402

0090509 PRECISION SMD RESISTOR

1/16W 100K±1% 0402

R27

0090681 PRECISION SMD RESISTOR

1/16W 120K±1% 0402

R5,R21,R22

Chapter six BOM List

X21L

（

）

SILVER WHITE

（

）

MAIN BOARD 5448402

- 66 -

Summary of Contents for X21

Page 1: ...service manual X21 RU ...

Page 2: ...aintenance Chapter Two Functions and Operation Instructions 2 1 USAGE INTRODUCTION 2 1 1 FUNCTIONS AND FEATURES 2 1 2 BUTTONS AND JACKS ILLUSTRATION 2 1 3 MAIN MENU ILLUSTRATION 2 1 4 PLAYING INTERFACE ILLUSTRATION 2 1 6 RECORDING INTERFACE ILLUSTRATION 2 2 BASIC OPERATIONl 2 2 1 INSTALL USB DRIVE PROGRAM 2 2 2 INSTALL USB DRIVE PROGRAM 2 2 3 USE MOBILE STORAGE FUNCTION 2 2 4 DISCONNECT USB SAFELY...

Page 3: ...unction introduction and principle of the player 3 1 2 Block diagram 3 1 3 Introduction to IC used by the player Section Two Unit Circuit Principle 3 2 1 FLASH circuit principle 3 2 2 FM module circuit 3 2 3 OLED module circuit 3 2 4 USB jack circuit 3 2 5 Button circuit 3 2 6 Charge management circuit 3 2 7 Low voltage detecting circuit 3 2 8 Battery protection circuit 3 2 9 Power management modu...

Page 4: ...to LM2703 3 5 7 TPS79301 3 5 8 Function introduction to TPS62200 3 5 9 Function introduction to ISL6294 3 5 10 Function introduction to S80829 3 5 11 Function introduction to TEA5767HN Chapter Four Disassembly and Assembly Process 4 1 Whole set 4 1 1 Disassembly process of the whole set 4 1 2 Assembly process of the whole set 4 2 OLED display screen 4 2 1 OLED disassembly process 4 2 2 OLED assemb...

Page 5: ...Chapter Cinque PCB board Circuit diagram Section One PCB board Section Two circuit diagram Chapter six BOM List 61 61 62 66 ...

Page 6: ... metal embedded under the earth should be determined according to the wettability of the local soil For humid places it may be shorter and longer and deeper for dry places If possible it can be distributed and layed in terms of shape 2 On operating table board the antistatic table cushion should be covered and grounded 3 All devices and equipments should be placed on the antistatic table cushion a...

Page 7: ...iation 1 2 4 Current method Set the multimeter in current position and test current of the player of a certain point to judge the trouble spot But when testing in current method the multimeter should be series connected in the circuit which makes this method too trivial and troublesome so it is less frequently used in reality 1 2 5 Cutting method Cutting method should be combined with electric res...

Page 8: ...for maintenance Audio Generator Digital oscillograph 100MHE SMD rework station Multimeter Soldering iron Pointed month pincers Cutting nippers Forceps Electric screw driver Terminals connecting cord Headphone Microphone 3 ...

Page 9: ...esource manager FM tuning function Auto scanning and auto manual memory function may listen to FM radio station programs more easily And you may record FM program into WAV files directly Voice recording function May be used to record in class meeting and interview USB 2 0 transmission full speed USB2 0 full speed data transmission Support firmware upgrading function Support upgrading function You ...

Page 10: ...e selected item or confirm the setup enter recording mode A B repeat switch sound effect delete file Start FM recording adjust volume adjust dB value 2 3 4 5 HOLD button Push towards arrow to lock buttons and push toward the opposite direction to unlock Headphone jack USB jack 2 1 3 MAIN MENU ILLUSTRATION 6 7 8 My music Memorize music file My Voice Memorize microphone recording file such as meetin...

Page 11: ...g figure You only need to find the drive nformation file on disc according to prompt information to finish the installation of drive program 3 After installation finishes restart the computer and you may use the mobile storage function normally Shown as the following figure 2 2 2 INSTALL USB DRIVE PROGRAM 2 2 3 USE MOBILE STORAGE FUNCTION This player can be used as mobile storage in Windows ME 200...

Page 12: ...ong may realize fast backward CAUTION Fast forward and fast backward operation are only for the current track After fast backward forward to the beginning ending of track it switches into normal playback automatically CAUTION 2 2 8 PLAY MUSIC When playing or tuning pressing button or for long may adjust volume The display of adjusting volume in music playback interface is shown as follows CAUTION ...

Page 13: ...nd press button to decrease 0 1MHz each time Press button to save radio station Press button for long to increase frequency continuously and stop until radio station has been searched Press button to save radio station Press button for long to decrease frequency continuously and stop until radio station has been searched Press button to save radio station M M PRESS 2 2 13 TUNING SAVE RADIO STATION...

Page 14: ...sound effect When the cursor moves to a certain sound effect mode the sound effect mode played by Mp3 player will switch to that in the cursor for the moment to facilitate you to select your desired sound effect mode Press button to confirm this sound effect mode CAUTION When playing files in REC there is no EQ Select item 2 3 4 SLEEP Press button to adjust the timing power off time After setup fi...

Page 15: ...CED Advanced items include some other system internal setup such as user sound effect setup default setup and system information My EQ In My EQ interface you may see the decibel dB of each frequency If you want to adjust the decibel of mediant 1kHz operate according to the below illustration M PRESS PRESS PRESS When adjusting width take 3dB as a step and the max adjustable range is 15dB After setu...

Page 16: ...ANCED item Make sure MP3 PLAYER has enough quantity of electric charge before upgrading To ensure successful firmware upgrading do not power off during the course of upgrading Upgrading will last about 10 seconds or more please try your best not to operate any buttons during this course After firmware upgrading finishes some function or interface may probably be different from user manual so pleas...

Page 17: ...nction Lithium battery module power supply of the player Memory module data storage of the player OLED module display of the working state of the player Headphone output audio output MIC external audio input which fulfills recording function Tuningmodle FM tuning 3 1 2 Block diagram Block diagram is shown in the figure 3 2 1 1 Chapter Three Principle and Servicing Figure 3 1 2 1 Block diagram of X...

Page 18: ...C model Function U1 TPS79301 Provide 3 3V voltage U2 G690L263T System reset U3 TPS62200 Provide 1 8V voltage U4 ISL6294 Charge management U5 S80829 Low voltage detect U6 Philips PNX0101 MP3 decode U7 PQ1X28 Provide 2 8V voltage U8 TC58512FT Flash Memory U9 SI912DL Headphone mute Tuning board U1 TEA5767HN Tuning module Mian board 13 ...

Page 19: ... is pull down resistor of WP Vcc is power supply pin of FLASH CE is chip selection signal VCC33 provides 3 3V voltage and FLASH begins to work RE WE are effective read and effective write signal end respectively to control read and write function of FLASH I O1 I O8 is 8 data lines to fulfill the exchanges of FLASH and external data 3 2 2 FM module circuit 1 FM module circuit schematic diagram is s...

Page 20: ...1 3 VCOT2 4 VCOVCC 5 DGND 6 DVCC 7 DATA 8 CLOCK 9 N C 10 W R 11 BUSM 12 BUSEN 13 SWP1 14 SWP2 15 XTAL1 16 XTAL2 17 PDLF 18 PHLF 19 N C 20 N C 21 LAVO 22 RAVO 23 TMUTE 24 MPXO 25 VREF 26 TCIFC 27 DIFL1 28 DIFL2 29 N C 30 N C 31 IFGAI 32 AGND 33 AVCC 34 RFI1 35 RFGND 36 RFI2 37 TCAGC 38 LOOPSW 39 R1 10R C5 475 X5R 0603 R2 18K 1 C4 47PF C2 27PF C3 472 R3 10K R4 22R Figure 3 2 2 1 FM module circuit sc...

Page 21: ... above VOLED is about 12 2V L25 C72 in circuit are energy storage inductor and output capacitor of boosted circuit OLED jack circuit is connected with OLED jack of PNX0101 directly the internal program of PNX0101 controls the characters display of OLED working state information of the player is displayed through OLED to fulfill man machine communication CN4 GND C65 16V 104 R72 0R R71 100K L24 601 ...

Page 22: ...58 SFI0402 050E100NP S5 VOL PREVIOUS S1 5 C 1 T 2 R56 220R C69 104 D_GND VCC33 VCC33 D_GND D_GND D_GND D_GND D_GND KEY_SCAN_2 2 KEY_SCAN_1 2 PREVIOUS MENU NEXT R54 1K R67 1K C57 104 R68 750R S4 VOL C70 SFI0402 050E100NP 2 Working principle buttons of X21 RU include a 3 direction button a HOLD switch and 4 single buttons in which one is ON OFF and PLAY button and will be introduced in ON OFF circui...

Page 23: ...ent is fulfilled through selecting external resistor R20 The relationship between Minimum charge current IMIN and R20 is shown as follows VCC33 P_GND R20 510K 1 R21 120K 1 P_GND Q6 SS8050LT R22 120K 1 P_GND R25 10K I_SET C12 105 X5R P_GND R16 47K R26 100K USB_VBUS U4 ISL6294 IN 1 PPR 2 CHG 3 EN 4 GND 5 IMIN 6 IREF 7 BAT 8 STATUS BAT Seen from the above minimum charge current is about 20 milliamper...

Page 24: ...uit schematic diagram 2 Working principle low voltage detecting ciorcuit is fulfilled by IC S80829CNNB and PNP triode Q4 S80829CNNB is high precision voltage detector detect valve value is 2 9V and precision is 2 P_VDD is he input voltage of the player when P_VDD is lower than 2 9V RST pin of IC outputs low level pin triode Q4 is saturated on control level output is low level which cuts off the po...

Page 25: ...n board when in protection these two pins output low level to control MOSFET and turn off power Over current detection short circuit protection is fulfilled through detecting short corcuit stat cts that voltage on R2 increases instantly to control DOUT and COUT to output low level at the same time and control MOS tube to cut off from battery to protect battery 3 2 9 Power management module 1 Funct...

Page 26: ...al 103 capacitor C4 to decrease output noise the setup of TPS79301 output voltage is decided by the resistance value of the two externally connected resistors of FB pin and the relationship is shown as follows Seen from the above VOUT is about 3 2V 1 8V power of the working of the player is provided by IC TPS62200 and peripheral circuit TPS62200 is high efficiency voltage drop DC DC converter EN i...

Page 27: ...ocket CN3 pin 2 and pin 5 of SI1912DL are connected to mute circuit after pressing MUTE button the control dual MOS tube is cracked to cut off the output of headphone left and right channels D6 is circuit is TVS diode array and used to protect ESD Ground wire of headphone is also served as the antenna input of FM module 3 2 11 Reset circuit 1 Reset circuit supplies rest signal to PNX0101 Reset cir...

Page 28: ...high level through Q2 R12 and D3 to make power management module work power system of the player starts and machine power on when power off normally for instance press ON ONN button for a long time or battery electric charge is too low PNX0101 sends out OFF high level to make Q3 saturated on to pull EN down to ground power management module stops working and machine power off when accidents happen...

Page 29: ...lectrical signal through C61 coupling output to ADC circuit of PNX0101 to converse analog electric signal to digital electric signal and form WAV files after encoding of software to save in FLASH In the circuit R59 R60 Q9 and C60 are triode voltage stabilizing system which provides stable power bias for microphone R61 is the bias resistor of microphone 24 ...

Page 30: ... VOUT 6 C6 102 R2 20K 1 VCC33 C2 106 X5R R1 33K1 C4 103 C1 22PF C3 106 X5R R3 68K VCC33 P_GND P_GND P_VDD P_GND P_GND Example 2 Symptom machine not switched on Description no screen display no response after pressing ON OFF button Analysis and troubleshooting firstly confirm whether it is machine not switched on or it is power not on connect to adapter or computer and check whether display on scre...

Page 31: ... 4 Symptom only one side of headphone has output Description only one side of headphone has output and the other has not Analysis and troubleshooting firstly decide the trouble lies in tuning components or in common part whether only one side has sound when listening and result is normal Tuning circuit is shown in the figure 3 3 1 3 tuning part components reaches the main board through a flat cabl...

Page 32: ... but low electric charge displays when power on after charge finishes Analysis and troubleshooting as for this trouble charge mode displays charge also displays but full charge is not available machine cannot power on after charging for 3 hours power on after unplugging charge line and low electric charge displays and machine power off automatically Charge management circuit diagram is shown in th...

Page 33: ...2 LCD_DB0 2 LCD_DB7 2 LCD_DB3 2 LCD_WR 2 LCD_CS 2 LCD_DB2 2 RESET 1 2 LCD_DB6 2 LCD_DB5 2 VOLED R65 2M L26 0R R70 240K 1 D8 MBR0520 SOD123 U10 TPS61040 LM2703 EN 4 VIN 5 FB 3 GND 2 SW 1 VDD 20 D C 15 D5 7 NC 1 VCOMH 3 D3 9 WR 14 IREF 4 RES 16 RD 13 VCC 2 BS2 18 D1 11 CS 17 GND 21 BS1 19 D0 12 D6 6 D4 8 D2 10 D7 5 Example 8 Symptom screen trouble Description screen display has error and disorder An...

Page 34: ...ownload firmware again and it is ok Note firmware of Mp3 need to be upgraded always When meets this trouble trouble is removed Figure 3 3 1 7 Recording circuit schematic doagram MIC switches the recorded external voice signal to electric signal through C61 coupling output to ADC circuit of Pn0101 and form WMV files after being coded by software to save in Flash Firstly lay sound file and check whe...

Page 35: ...r display screen flat cable holder has false welding N Y Change display screen components and check whether it is normal Display screen flat cable holder has trouble N Y Y Display screen has trouble 3 3 2 Troubleshooting flow chart 1 Troubleshooting process for No screen display is shown in the figure 3 3 2 1 Figure 3 3 2 1 Screen display circuit troubleshooting figure 30 ...

Page 36: ... socket has false welding Check each DC DC switch circuit and peripheral elements Check whether T1 or USB socket pin has rosin joint Change crystal oscillator or capacitor on two sides N 2 Troubleshooting process for USB not connected is shown in the figure 3 3 2 2 Y N Figure 3 3 2 2 USB jack troubleshooting flow chart whether oscillation of 12M crystal oscillator is normal Y N Y N Y 31 ...

Page 37: ...igure 3 3 2 3 Button has no function Whether all functions have no function Change HOLD button Change some button HOLD and 3 3V are short circuited Change BGA N whether lock button has action Change BGA Y N Y N Y Figure 3 3 2 3 Button circuit troubleshooting flow chart 32 ...

Page 38: ... Charger and computer cannot charge whether power supply is normal Whether BAT voltage has variation Check I_SET andwhether voltage high level is normal Check power supply circuit Battery components have trouble Battery full charged protected Discharge is ok Figure 3 3 2 4 Charge management circuit troubleshooting flow chart N N Y Y N Y Change IC6298 Y Y N 33 ...

Page 39: ... is normal Whether 5V input is normal Check whether Q8 is normal Whether 1 8V output is normal Check U3 and circuit around Whether load is too heavy Check U1 and circuit around BGA has trouble Check BGA working conditions Figure 3 3 2 5 Power management circuit troubleshooting flow chart N N Y N N Y N Y 34 ...

Page 40: ... S2 has open circuit and false welding Whether D8 is on Refer to troubleshooting flow chart for Power not on Check whether 3 3V power supply of R10 is normal Check whether R12 or D3 has open circuit Check whether EN end is normal Whether Q2 is normal Change S2 N N Y N Y Y N Y Figure 3 3 2 6 ON OFF control circuit troubleshooting flow chart 35 ...

Page 41: ...each unit circuit with the purpose to help servicing personnel to judge where trouble lies in accurately and quickly to improve servicing skills For the difference of oscillograph s type model and tuner a certain difference may exist so the servicing personnel are expected to pay more attention to check in daily operation 1 12M crystal oscillator oscillation waveform diagram 36 ...

Page 42: ...3 L1 1 8V energy storage waveform diagram 4 LCD_CS wabeform 5 LCD_D C waveform diagram 37 ...

Page 43: ...6 LCD_RESET 7 LCD_WR waveform diagram 8 LCD_RD waveform diagram 38 ...

Page 44: ...9 LCD_DB0 waveform diagram 1 1 L C D _ D B 2 w a v e f o r m d i a g r a m 10 LCD_DB1 waveform diagram 39 ...

Page 45: ...12 LCD_DB3 waveform diagram 13 LCD_DB4 waveform diagram 14 LCD_DB5 waveform diagram 40 ...

Page 46: ...15 LCD_DB6 waveform diagram 16 LCD_DB7 waveform diagram 17 IREF waveform diagram 41 ...

Page 47: ...18 VCOMH waveform diagram 42 ...

Page 48: ...rking voltage V FM3V3 CN1_4 2 82 CN4_2 12 36 CN4_3 screen bright 9 58 CN4_4 9 46 CN4_20 3 31 VCC33 one end of R62 3 31 U8_9 3 28 U8_12 3 31 U8_19 3 31 Q9_C 3 31 Q9_B 2 65 Q9_E 2 06 MIC_ 1 71 KEYSCAN_1_S3 1 09 KEYSCAN_1_S4 1 12 KEYSCAN_1_S5 0 43 ...

Page 49: ...essor with 8 k byte dedicated cache Pin function of PNX0101 is shown as the following table PIN Main Description T10 XTALH_IN 12M clock in V9 XTALH_OUT 12M clock out U9 XTALH_VDDA18 Crystal oscillator analog power supply T9 XTALH_VSSA Crystal oscillator analog ground V7 XTALH_IN Digital ground T8 XTALH_OUT Unused U8 XTALH_VDDA18 Crystal oscillator analog power supply V9 XTALH_GNDA Crystal oscillat...

Page 50: ...adphone analog ground T3 ADC_VCOM AC grounding U2 ADC_VREFP Voltage reference V1 ADC_VREFN Grounding V3 ADC_VDDA18 Analog 1 8V power supply U3 ADC_VDDA33 Analog 3 3V power supply V2 ADC_GNDA Grounding U1 ADC_VREF AC grounding T1 ADC_VINR Analog input right tuning right T4 ADC_VINL Analog input left tuning left R3 ADC_MIC Analog input MIC input T2 ADC_MIC_LNA G2 LCD_RW_WR LCD read write gating F2 L...

Page 51: ...ed U16 USB_VDDA18_BG Unused U18 USB_VDDA33 Unused V18 USB_VDDA33_DRV Unused H17 DAI_BCK Unused G17 DAI_WS Unused G16 DAI_DATA Unused F16 DAO_CLK Unused G18 DAO_BCK Unused F18 FAO_WS Unused F17 DAO_DATA Unused T13 JTAG_TRST_N J1 V4 JTAG_TCK J2 U12 JTAG_TMS 3 3V T5 JTAG_TDI J3 U13 JTAG_TDO J4 U4 JTAG_SEL_ARM J5 H16 IIC_SCL Serial clock IIC control J17 IIC_SDA Serial data IIC control B8 C8 B7 C7 B6 C...

Page 52: ... Unused A12 MPMC_BLOUT_0 Write gating B1 MPMC_RPOUT Unused L3 UART_TXD Unused K3 UART_RXD Unused K2 UART_NCTS Unused K1 UART_NRTS Unused J16 GPIO_3 DFO K18 GPIO_2 G2 K17 GPIO_1 G2 K16 GPIO_0 P_GND T14 RSTIN_N System reset V15 FLASH_VDD_HV H1 VDDI1 Merm core power supply V11 VDDI2 Core power supply V16 VDDI3 Flash core power supply G1 VSSI1 Merm core grounding V12 VSSI2 Core grounding V17 VSSI3 Fla...

Page 53: ...grounding N16 DCDC_VSS2 DC DC grounding L16 DCDC_GND Core grounding M18 DCDC_CLEAN Datum circuit grounding 3 5 2 Function introduction to G690 The G690 are microprocessor UP supervisory circuits used to monitor the power supplies in and digital systems They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 5V 3 3V 3 0V powered circ...

Page 54: ...solution for the solid state mass storage market A program operation can be performed in typical 200µs on the 2112 byte page and an erase operation can be performed in typical 2ms on a 128K byte block Data in the data page can be read out at 30ns cycle time per byte The I O pins serve as the ports for address and data input output as well as command input The on chip write controller automates all...

Page 55: ... MOS tube 2 4 S2 S electrode of MO tube 2 5 G2 G electrode of MOS tube 2 6 D1 D electrode MO tube 1 3 5 6 Function introduction to LM2703 The LM2703 is a micropower step up DC DC in a small 5 lead SOT 23 package A current limited fixed off time control scheme conserves operating current resulting in high efficiency over a wide range of load conditions The 21V switch allows for output voltages as h...

Page 56: ...chieves fast start up times approximately 50µs with a 0 001 µF bypass capacitor while consuming very low quiescent current 170 µA typical Moreover when the device is placed in standby mode the supply current is reduced to less than 1 µ A Pin function is shown as the following figure Pin Contiguous signal name Function description 1 VIN Voltage input 2 GND Grounding 3 EN IC enable pin 4 BYPASS Inte...

Page 57: ...by Li ion batteries The charger accepts an input voltage up to 28V but is disabled when the input voltage exceeds the OVP threshold typically 6 8V to prevent excessive power dissipation The 28V rating eliminates the over voltage protection circuit required in a low input voltage charger The charge current and the end of charge EOC current are programmable with external resistors When the battery v...

Page 58: ...l signal voltage output pin 2 VDD Voltage input pin 3 NC Unused 4 VSS Grounding 3 5 11 Function introduction to TEA5767HN The TEA5767HN is a single chip electronically tuned FM stereo radio for low voltage application with fully integrated IF selectivity and demodulation The radio is completely adjustment free and only requires a minimum of small and low cost external components The radio can be t...

Page 59: ...ed 22 LAVO Left channel audiovoltage output 23 RAVO Right channel audio voltage output 24 TMUTE Software mute time constant 25 MPXO FM tuner MPX signal output 26 VREF Voltage reference 27 TCIFC IF adjusts time constant 28 DIFL1 Decouple IF limiter 1 29 DIFL2 Decouple IF limiter 2 30 NC Unused 31 NC Unused 32 IFGAI IF gain control 33 AGND Analog ground 34 AVCC Analog power supply 35 RFI1 F input 1 ...

Page 60: ...ay screen battery and tuning board You are supposed to operate according to the illustrations strictly Note all operations must be with strict anti static measures operators must wear anti static hand wrist or gloves electric screwdriver must be grounded effectively and articles of screwdriver and nippers must be removed static electricity before use 4 1 Whole set 4 1 1 Disassembly process of the ...

Page 61: ...ull the middle casing A of USB jack outwards to take down main board 56 2 Exert strength with nails towards the upward arrow direction from the joint place of rear casing aluminum alloy and middle casing A B and take down rear casing ...

Page 62: ...prevent then from falling off in the course of assembly you may use adhesive tape outside the front casing to fasten when necessary 2 Install main board into front casing Pay attention to install one end of headphone jack firstly and LOCK button A on main board must be aimed at the lock button cap on front casing 3 Install 4 rings A B C D 57 ...

Page 63: ...own main board and pull up display screen according to the direction shown in the illustration 2 Push away the 2 clasps according to the direction shown in the illustration pull up display screen data line and take down OLED screen 58 4 2 2 OLED assembly process Assemble according to the direction of disassembly process of OLED display screen ...

Page 64: ...ake down battery according to arrow direction 2 Use brand iron to weld out point A and B and take down battery 4 3 2 Li battery assembly process 1 Use brand iron to well weld point A and B and pay attention that point A is connected to anode of Li battery and point B the cathode 59 ...

Page 65: ...M tuning board disassembly process Exert strength according to upward arrow direction from B position with fingers and take down FM board 4 4 2 FM tuning board assembly process Aim the FM tuning board at the 8pin socket on main board and insert FM tuning board Pay attention to the direction 60 ...

Page 66: ...Chapter Cinque PCB board Circuit diagram Section One PCB board X21 PCB Board 61 ...

Page 67: ...B2 A2 A1 C13 B13 A13 C14 B14 A14 C15 B15 C16 B16 C17 B17 C18 B18 D18 D17 D16 E18 E17 E16 A18 B11 A11 L3 K3 K2 K1 K16 J16 K18 K17 U6 T7 U7 M3 M2 D3 D1 D2 C3 C1 C2 V4 U12 T5 U13 U4 H16 J17 P18 N16 L16 M18 G1 V12 V17 F1 V6 V13 H18 A15 A6 R17 T16 R16 V2 U1 V1 P2 P1 T3 T2 M1 T9 V8 T11 U10 B7 C8 B8 A8 C9 B9 A10 B10 C11 A9 C10 A17 B12 C12 A12 B1 L17 L18 M17 N17 P17 T18 R18 M16 N18 H1 V11 V16 V15 E1 V5 V1...

Page 68: ... 13 2 18 11 17 21 19 12 6 8 10 5 VDD D C D5 NC VCOMH D3 WR IREF RES RD VCC BS2 D1 CS GND BS1 D0 D6 D4 D2 D7 C68 22P SW2 MK12C02 1 3 2 VOLED D7 1N4148WS D5 RCLAMP0504F SC 70 6L 3 6 2 1 4 5 S5 VOL C60 106 C67 104 C57 104 U10 TPS61040 LM2703 4 5 3 2 1 EN VIN FB GND SW R50 601 1005 S4 VOL R74 0R Q8 SS8550LT C54 106 R46 10K C55 104 R45 10K PLAY R66 47K R44 1K R51 0R R60 470K R68 750R C71 475 X5R 6 3V R...

Page 69: ...00K R14 47K R23 1M R6 100Ω C12 105 X5R C8 106 X5R BAT2 R8 10K VCC18 U4 ISL6294 DFN8 1 2 3 4 5 6 7 8 IN PPR CHG EN GND IMIN IREF BAT D3 1N4148WS U3 TPS62200 FAN5307 SOT23 5 1 2 3 4 5 VI GND EN FB SW R24 100K U2 G690L263T71 R3111N252CT1 1 3 2 RESET GND VCC C13 SFI0402 050E100NP Q5 MMST3904 C1 22PF R2 20K 1 R20 510K 1 C4 103 D2 1N4148WS Q1 SI2305DS SOT23 D S G C3 106 X5R R5 120K 1 R7 1K R25 10K U1 TP...

Page 70: ...105 X5R 0402 L3 33nH CN1 CON2X4 8 7 6 5 1 2 3 4 D1 BB202 R5 100K R3 10K C17 223 U1 TEA5767HN 1 40 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 N C N C CPOP VCOT1 VCOT2 VCOVCC DGND DVCC DATA CLOCK N C W R BUSM BUSEN SWP1 SWP2 XTAL1 XTAL2 PDLF PHLF N C N C LAVO RAVO TMUTE MPXO VREF TCIFC DIFL1 DIFL2 N C N C IFGAI AGND AVCC RFI1 RFGND RFI2 ...

Page 71: ...385 SMD RESISTOR 1 16W 10K 5 0402 R8 R9 R25 R36 R45 R46 L16 0090396 SMD RESISTOR 1 16W 33K 5 0402 R18 R28 R30 0090400 SMD RESISTOR 1 16W 47K 5 0402 R14 R16 R58 R66 0090404 SMD RESISTOR 1 16W 68K 5 0402 R3 0090408 SMD RESISTOR 1 16W 100K 5 0402 R10 R11 R12 R17 R24 R26 R38 R39 R40 R 47 R59 R62 R71 0090425 SMD RESISTOR 1 16W 470K 5 0402 R15 R60 0090433 SMD RESISTOR 1 16W 1MO 5 0402 R23 R34 R35 009043...

Page 72: ...C55 C5 6 C57 C61 C66 C67 C69 0310790 SMD CAPACITOR 10V 104 20 X5R 0402 C18 C19 C24 C25 C26 C27 C30 C34 C35 C 38 C41 C43 C44 C45 C46 C50 C52 C55 C5 6 C57 C61 C66 C67 C69 0310483 SMD CAPACITOR 10V 105 10 X5R 0603 C11 C12 0310674 SMD CAPACITOR 6 3V 475 10 X5R 0603 C14 C71 0310717 SMD CAPACITOR 6 3V 475 20 X5R 0603 C36 C37 0310486 SMD CAPACITOR 6 3V 106 20 X5R 0805 C2 C3 C8 C9 C39 C40 0310389 SMD CAPA...

Page 73: ... SOT23 5 U1 0882481 IC G690L263T71 SOT23 3 U2 0882476 IC TPS62200 SOT23 5 U3 0882851 IC ISL6294IRZ DFN U4 0882524 IC S80829CNNB SC 82 U5 0882403 IC PNX0101ET N302 TFBGA U6 0882480 IC PQ1X281M2ZP SOT23 5 U7 0882629 IC TPS793285DBVR SOT23 5 U7 0882875 IC K9K8G08U0M PCB0 TSOP U8 0883145 IC K9K8G08U0A PCB0 TSOP U8 0882565 IC LM2703 SOT 23 5 U10 0882999 IC FAN5331 SOT23 5 U10 0882675 IC K9K4G08U0M PCBO...

Page 74: ...23 6 U1 0790065 SMD FIELD EFFECT TRANSISTOR ECH8601 TSSOP U2 0790090 SMD FIELD EFFECT TRANSISTOR ECH8601R TSSOP U2 1632263 PCB EX9 0 0310432 SMD CAPACITOR 50V 101 5 NPO 0402 C1 0310418 SMD CAPACITOR 50V 27P 5 NPO 0402 C2 0310706 SMD CAPACITOR 25V 472 10 X7R 0402 C3 0310424 SMD CAPACITOR 50V 47P 5 NPO 0402 C4 0310486 SMD CAPACITOR 6 3V 106 20 X5R 0805 C5 0310712 SMD CAPACITOR 10V 473 10 X5R 0402 C6...

Page 75: ...T1 1860088 FLAT FEMALE 4p 1 27mm DUAL RANK SMD MOLD HIGH 2 1mm CN1 1632993 PCB FX21RUP 0 0090223 SMD RESISTOR 1 16W 2K 5 R2 0090011 SMD RESISTOR 1 16W 470O 5 0603 R1 0310207 SMD CAPACITOR 50V 104 20 X7R 0603 C1 C2 C3 0310543 SMD CAPACITOR 50V 104 10 X7R 0603 C1 C2 C3 0882570 IC S 8261AANMD G2N T2 SOT23 6 U1 0790065 SMD FIELD EFFECT TRANSISTOR ECH8601 TSSOP U2 0790090 SMD FIELD EFFECT TRANSISTOR EC...

Page 76: ...OR 16V 223 10 X7R 0402 C16 C17 0090326 SMD RESISTOR 1 16W 10O 5 0402 R1 0090390 SMD RESISTOR 1 16W 18K 5 0402 R2 0090385 SMD RESISTOR 1 16W 10K 5 0402 R3 0090447 SMD RESISTOR 1 16W 22O 5 0402 R7 R4 0090408 SMD RESISTOR 1 16W 100K 5 0402 R5 0090396 SMD RESISTOR 1 16W 33K 5 0402 R6 0700115 SMD TRANSFIGURATION DIODE BB202 D1 D2 0390112 SMD COIL THREAD INDUCTOR 33nH 5 1608 L2 L3 0390326 SMD COIL THREA...

Search results

Summary of Contents for X21

Reviews:

Related manuals for X21

Brands by name

Popular brands

Teclast X21, Service Manual

Search results

Summary of Contents for X21

Reviews:

Related manuals for X21

Brands by name

Popular brands