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BBK AV225T Service Manual

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Summary of Contents for BBK AV225T

  • Page 1 AV225T service manual...

  • Page 2: Table Of Contents

    Catalog Chapter One About Maintenance 1.1 Safety precautions 1.1.1 Power supply 1.1.2 Precautions for antistatic 1.1.3 About placement position 1.2 Maintenance method 1.2.1 Visualized method 1.2.2 Electric resistance method 1.2.4 Current method 1.2.5 Cutting method 1.2.4Currentmethod 1.2.5Cuttingmethod 1.2.6 Element substitution method 1.2.7 Comparison method 1.3 Required device for maintenance Chapter Two Operation Instructions...
  • Page 3 2.2.9 Parameter Processing 2.2.10 Adjust Karaoke 2.2.11 Tuning Function 2.2.12 Other Operations Chapter Three Principle and Servicing Section One Principle of the Player 3.1.1 Composition of the player 3.1.2 Function and features 3.1.3 Player block diagram 3.1.4 The player signal flow chart Section Two Unit Circuit Principle 3.2.1 Volume board circuit 3.2.2 Signal processing board circuit...
  • Page 4 3.5.9 function introduction to Lm1875 3.5.10 function introduction to TDA7265 3.5.11 function introduction to M62446 3.5.12 function introduction to AT24C02 3.5.13 function introduction to L7805 3.5.14 function introduction to 7812 3.5.15 function introduction to 7912 3.5.16 function introduction to LM324 3.5.17 function introduction to Pt2315 3.5.18 function introduction to 74VHC245 3.5.19 function introduction to Cd4094...

  • Page 5: Chapter One About Maintenance

    Chapter One About Maintenance 1.1 Safety precautions 1.1.1 Power supply When servicing audio power amplifier, the servicing personnel pay special attention to the power board with 220V AC, or else the improper operation will lead to body damage. The alternate current which outputs to power amplifier board through power board is also up to voltage with about 50V;...

  • Page 6: About Placement Position

    1.1.3 About placement position Audio power amplifier cannot be installed in places with high temperature and humidity. 2. Positions for placement should be stable and secure. 1.2 Maintenance method 1.2.1 Visualized method Directly view whether abnormalities of collision, lack of element, joint welding, shedding welding, rosin joint, copper foil turning up, lead wire disconnection and elements burning up among pins of elements appear.

  • Page 7: Element Substitution Method

    1.2.6 Element substitution method When some elements cannot be judged good or bad, substitution method may de adopted directly. 1.2.7 Comparison method A same good PC board is usually used to test the correct voltage and waveform. Compared these data with those tested through fault PC board, the cause of troubles may be found. Through the above maintenance method, theoretical knowledge and maintenance experience, all difficulties and troubles will be readily solved.

  • Page 8: Chapter Two Operation Instructions

    Chapter Two Operation Instructions 2.1 CONTROL BUTTON LOCATIONS AND EXPLANATIONS 2.1.1 FRONT PANEL ILLUSTRATLONS POWER SWITCH Tuning Power on/off this unit Select other frequency radio stations LCD Screen downwards Buttons operation indication and spectrum BAND display when working Select FM/AM tuner BAND IR sensor PRESET Receive the infrared signals transmitted from...

  • Page 9: Front Panel Illustratlons

    2.1.2 REAR PANEL ILLUSTRATION AC-3/DTS 5.1CH INPUT 5.1CH audio signals input terminals that connect to DVD, AC-3/DTS AM/FM antenna terminal Connect AM/FM antenna outside Stereo Audio jack The terminals that connect with VCD, DVD stereo audio signals input Video input The terminals that connect with VCD,DVD Video signals input Video output jack...

  • Page 10: Asic Operations Remote Control B

    VOLUME button: Adjust the karaoke level with / keys The signal automatically, press the INPUT button ECHO button: Adjust the karaoke ECHO with / keys on the remote control to select the input signal. VOICE MODIFY: MODIFY button: Select Karaoke voice modify When the unit is in normal working mode, WF button: Karaoke wide sound field On/Off press the STANDBY button on the front panel or...

  • Page 11: Select Input Sound Source

    K.R.OK button after inserting microphone and 2.2.3 Select Input Sound Source The system will automatically set standard This unit utilizes two input lines of stereo audio Karaoke mode. sources: VCD, DVD; one line 5.1 channel signal Press the MOVIE button to set standard input.

  • Page 12: Select Sound Field

    Press the STANDARD button on the remote The display "BASS driver 1-3" means the first, control and "STANDARD" will display, which second and third Bass Enhancer; the subwoofer means the system enters standard sound field. signal adds into the master channelsignal; turn off the subwoofer line output.

  • Page 13: Adjust Volume

    Modes between Affectional movie, Sowordsmen 2.2.7 Adjust Level movie, Gunfignt movie, Sci-fi movie and music. 1 Left channel level The environment surround is invalid in 2- When sound of left and right channels is channel signal input status. imbalance, you may adjust R channel level to The environment surround is invalid if make it in balance with L channel.

  • Page 14: Eq Function

    may adjust surround left level to make it suitable Press the " " button on the remote control to to the sound field. increase the volume of subwoofer. The max level Press the SPEAKERS button on the remote is +60. Press the "...

  • Page 15: Parameter Processing

    Press the AUTO EQ button on the remote channel level is too high or too low, the system control to display the analyzing curve. will adjust automatically EQ function Auto EQ setup is invalid in Hi-Fi mode. 2.2.9 Parameter Processing To memory the current parameter for later use, or use the defauly parameter, the Memory and Call functions will be used.

  • Page 16: Adjust Karaoke

    2.2.10 Adjust Karaoke 1 Microphone Volume When inserting microphones to sing Karaoke, press the MIC VOL button to adjust the volume of microphonewhen the microphone voice is too high, too low or unsuitable. Press the " " button of MIC VOL on the front panel to increase the volume of microphone The maximum volume is 30.

  • Page 17: Tuning Function

    5 Delay 7 Wide Field When inserting microphone to sing Karaoke, you When inserting microphone to sing Karaoke, you may adjust microphone delay when the sound is may select to switch on/off Karaoke wide field not full. when the sound field is not wide. Press the "DELAY"...
  • Page 18 NOTE: 1. This operation will search and save automatically, so the user-preset programs will be covered. 2. Pressing TUNING / button may stop the function in the course of this operation. If the tuning searching stops in imperfect radio station (because of weak radio station signals or radio wave interferes), please change into manual tuning method.

  • Page 19: Other Operations

    NOTE: 1. AM round antenna should be placed far away from the equipment. You may put up on the wall or on the bookshelf. 2. AM round antenna and outdoor antenna can be used at the same time. Connect to FM Antenna Connect to the indoor FM antenna Connect the accessional indoor FM antenna to UNBAL.FM ANT terminal.
  • Page 20 2 Child Lock The DISPLAY button cannot be selected when no signals input. To prevent the children wrongly pressing the front panel buttons, you may lock the buttons on Other Operations the front panel. Press the CHILD LOCK button on the remote control to display "LOCK".

  • Page 21: Chapter Three Principle And Servicing

    Chapter Three Principle and Servicing Section One Principle of the Player AV225T (RU) is an advanced power amplifier with complete functions. Based on the former power amplifiers, it adopts LCD screen, with sky blue background matched with 16 different kinds of spectrum display styles, in addition, this player is with tuning function and it is an excellent selection for users who love listening to radio.

  • Page 22: Player Block Diagram

    220V Signal output XP13 XS13 RLY0 P_RC XL100 Video board P_RC OVER Tuner socket XS101 P_LRM P_CSM XP101 Volume board Power board XS20 XS22 XP20 XP22 Xp101 Transformer Sublevel coil elementary D+5V CPU board DGND SWITCH XP100 XS25 XP23 XS23 XS103 XS12 XS102...

  • Page 23: The Player Signal Flow Chart

    TUNER(L/R) Power amplifier board 5.1CH VCD(L/R) LR_T Headphone DVD(L/R) amplifier 5.1CH(L/R) Preposition power S-C/S-SL/S-SR MIC input MIC, headphone VS+ GND VS- C/SL/SR Video in/out board board Volume board SL/SR Power C/SL/SR D-SW L/R/C 5.1CH(C/SL/SR) 5.1CH(C/SL/SR) Signal board 5.1CH(SW) 5.1CH(SW) S-C C/SL/SR/SW Load DLSPLY test...

  • Page 24: Section Two Unit Circuit Principle

    AV225T (RU) has 4 kinds of input means in all: tuning input, VCD, DVD stereo input and 5.1CH input. The Cyber logic function of AV225T (RU) is to achieve C, SR, SL and SW signal through buffer and processing of adder and subtracter after sampling from L, R channels. In this circuit, electronic simulation switch is adopted to fulfil the switch in all kinds of state.
  • Page 25 5.1CH is outputted through pin 4 of N103, amplified by N107A and then sent to M62446. (2) 3 kinds of analog input modes: AV225T (RU) has 3 kinds of analog input modes: tuning signal, VCD and DVD are controlled through signals A, B separately. Please refer to CD53 truth value table for reference.
  • Page 26 The display of display screen is controlled by CPU directly. 3. Spectrum sampling circuit The spectrum sampling in AV225T (RU) is sent from pin 13 of N103 to N108B for amplification, and then sent to spectrum gating circuit. 5.1CH of M62446 selects sampling signal. When selecting Cyber Logic, 5.1CH control signal is low level, now pin 9, 11 of N103 is low level, and it is known from the truth...

  • Page 27: Signal Processing Board Circuit

    The signal board performs mixed amplification to 5.1CH signal sent from volume board, voice signal sent from microphone, headphone board and Karaoke echo signal. 1. AV225T (RU) Karaoke circuit (1) Function: this circuit is to reset by loudspeaker after handling voice and being amplified by power amplifier.
  • Page 28 (4) Scene mode signal flow AV225T (RU) has a special function, that is, it may realize switch in 5 kinds of scene mode when there is no Karaoke, which is fulfilled by Karaoke part. Signal flow chart is shown as in the figure 3.2.2.2:...

  • Page 29: Mcu Board Circuit

    V101 is cutoff, SW signal is overlapped to left and right channel signal. Bass enhancer of AV225T (RU) is divided into 3 levels, the principle is to change the high/low of bass enhancer level through changing SW output volume of M62446.
  • Page 30 1. The player MCU control N100 is the control centre of the player, various control instruction are outputted by it to each controlled circuit to fulfil each control function. +5V power supply is adopted, and pin 40 is its power supply pin.
  • Page 31 AV225T (RU) has set auto spectrum gain adjustment circuit and adopted a single-channel 1-selected- from-8 electronic analog switch N104 CD4051, with its truth value table shown as follows: Through changing the resistance value of the reverse end grounding resistor of operation amplifier N104, gain of the operation amplifier is changed.
  • Page 32 Decreases the amplified multiple; when main volume is too small, N104 decreases the resistance value of grounding resistor automatically and increases the amplifies multiple. (3) Frequency point gating circuit: the signals after being amplified by N105C, through C115 coupling, are sent to the 7 bandpass filters composed by operational amplifier, the corresponding frequency range can be confirmed through setting the capacity of its feedback capacitor.

  • Page 33: Control Panel Circuit

    Receives low level signal, 35Hz level gating is immediately finished, and then switches to next frequency Point 100Hz. During the course of conversion, P_CHARGE outputs an instant high level to make V104 on, releases the voltage on C137, and makes the in-phase end of N102B begin the process of 100Hz charging from 0 level.

  • Page 34: Power Board Circuit

    Power board provides each unit circuit of the player with required various working voltage. Shown as in the figure 3.2.5.1, AV225T (RU) adopts a large power round transformer to supply power for main channel, central and surround channel power amplifier.

  • Page 35: Power Amplifier Board And Protection Circuit

    3.2.6 Power amplifier board and protection circuit 1. L/R channel power amplifying circuit L, R channel power amplifying circuit of AV225T (RU) is composed of discrete components. The composed block diagram is shown as in the figure 3.2.6.1: (take L channel as instance)
  • Page 36 4 Protection circuit Protection circuit of AV225T (RU) power amplifier is on power board. Protection means of L, R, C channel is through disconnecting relay Y100 when protection starts up to disconnect its output. SR, SL channel fulfils the protection function through mute. AV225T (RU) is with power-on delay protection, central point over-voltage and over-current protection, standby protection.
  • Page 37 (1) Power-on delay attracting protection circuit: when power on, working of circuit is stable, and the produced current has great damage to speaker and power amplifier, so delay attracting protection circuit is set. Power-on delay attracting protection circuit is divided into 2 steps: 1. C, L, R channel working process: the AC outputted from transformer, through rectification filtering of Vd113, C110, gets +22V voltage to make VD111 reverse broken-down through charge to C115 by R108 to make Vd111 reverse broken down to make V105, V104 positive direction on to make relay Y100 attracting to realize delay...

  • Page 38: Mic, Headphone Board

    3.2.8 Video in/out board circuit AV225T (RU) is with two-channel composite video input (VCD, DVD or 5.1CH) and one-channel composite video output (VCD, DVD or 5.1CH). Input/video switch of video signal is realized through a electronic switch CD4051 (N101), the truth...
  • Page 39 When select VCD channel, pin 1 and 2 of N106 (M62446) of volume board sends out two control signals of A and B, and one INH control signal. A=1, B=0, INH=0, known from Cd4051 truth value table that output pin of CD4051 (pin 3) selects X1, ie, VCD channel, now, in terms of volume board working principle in section 2, A and B also control gating of audio part CD4052, that is, audio channel also selects VCD channel, thus, the synchronous switch of audio and video of VCD channel is realized.

  • Page 40: Section Three Servicing Cases

    Section Three Servicing Cases 3.3.1 Servicing instances Instance 1 Trouble symptom: power-on protection Description: relay not attracting and display “System abnormal, auto protection”. Analysis and troubleshooting: system protection after power-on, relay not attracting; shown as in the figure 3.3.1.1, test whether L, R, C, SL, SR of power board flat cable holder XP8 has DC output, pin 1 of power board flat cable holder XS7 is tested high level, pin 2 is low level, C electrode of triode V101 is high level, known from the above test that protection is not caused by over-current and over-voltage (you may also unplug XP7 and XP8 flat cable holder and check whether it also has protection).
  • Page 41 2. Power-on protection causes: over-current protection, over-current protection and CPU not detect RLY0 signal: test whether each output channel has DC output; when power-on protection trouble appears, make clear which kind of reason caused this. The common protection is that abnormal centre or surround power IC causes that output signal has DC.
  • Page 42 Instance 3 Symmtom: no output Description: after power on, connect to 5.1CH, main channel has no output, central and surround have output, power board FL101, FL102 fuse is burnt down. Analysis and troubleshooting: change fuse of FL101, FL102 and power on again. Fuse is burnt down, power off, test resistance to ground of power board Vc+, Vc- and find that resistance is 0 ohm;...
  • Page 43 Capacitor C219, there is signal, power supply voltage of N200 is normal, the trouble lies in N200 PT2315 by primary judgment; change PT2315 and trouble is removed. +12V R204 C20247u/16V N200PT2315 100/0.25W P_SCL P_DATA DATA AGND DGND VD200 C211 9.1V C225 TREBL LOUT...
  • Page 44 Instance 6 Symptom: no OSD (on screen display) Description: after power on, relay attracting, output signal is normal, LCD has no display, background light of display screen is lighted when pressing buttons. Analysis and troubleshooting: because background light is bright, it is confirmed that +5V voltage of control panel is normal.

  • Page 45: Troubleshooting Process

    3.3.2 Troubleshooting process 1. Symptom: Karaoke has no sound Analysis: for this kind of trouble, you may usually adopt signal injection method to check stage by stage. If a certain stage does not give out disturbance sound, this stage has problem; this method is generally preformed from back stage to front stage.
  • Page 46 2. Troubleshooting process for “No spectrum display” is shown as the following figure 3.3.2.2; No spectrum display Whether V105 collector Check CPU, I C bus electrode has high and low level variation Check power supply, V105 No spectrum display and peripheral circuit Check whether VD118 is Change VD118...
  • Page 47 3. Troubleshooting process for “Power-on protection” is shown as the following figure 3.3.2.3: Power-on protection Check whether there is Check which channel outputs central point DC and check this channel voltage Check whether protection Check whether the current- is fulfilled when signal is protection diode or triode is added or main volume damaged, or capacitor C115...
  • Page 48 4. Troubleshooting process for “Cannot search automatically” is shown as the following figure 3.3.2.4: Cannot search automatically Whether Check CPU board spectrum sampling DISPLAY signal is sent to the negative direction and amplifying circuit N103, N108B terminal of N103A of of volume board CPU board Whether...
  • Page 49 5. Troubleshooting process for “No output (2-channel)” is shown as the following figure 3.3.2.5: No output (2-channel) Check whether power Refer to troubleshooting supply of each channel of "Power not on" is normal Check Check whether MIC holder whether mute circuit is normal and then check signal is normal mute circuit...
  • Page 50 6. Troubleshooting process for “5.1CH has no output” is shown as the following figure 3.3.2.6: 5.1CH has no output Change Refer to troubleshooting into 2CH and check whether it has of "2CH has no output" output Check power supply of Check power supply circuit N102, N103 Change N102, N103...
  • Page 51 7. Troubleshooting process for “Left channel has no output” is shown as the following figure 3.3.2.7: Left channel has no output Check Check Check Check whether power whether power whether signal board waveform of volume amplifier board flat amplifier board flat X200 is board C122 cable XS9 has...
  • Page 52 8. Troubleshooting process for “Power not on” is shown as the following figure 3.3.2.8: Power not on Check Check whether each whether each Change the burnt-out channel power is protector tube is protector tube short-circuited to normal ground Check Check whether voltage the voltage of power board XP8VC+...

  • Page 53: Section Four Servicing Parameters

    Section Four Servicing Parameters 3.4.1 Signal waveform diagram This section collects signal waveform diagram of audio, video and each unit circuit with the purpose of helping servicing personnel to judge where the trouble lies accurately and quickly to promote their servicing skills.
  • Page 54 3. Volume board capacitor C121 R waveform diagram: 4. Volume board capacitor C120 C waveform diagram: 5. Volume board capacitor C119 (SL) waveform diagram: - 50 -...
  • Page 55 6. Volume board capacitor C118 (SR) waveform diagram: 7. Volume board capacitor C117 (SW) waveform diagram: 8. Waveform diagram of outputting C133 (L) after volume adjustment: - 51 -...
  • Page 56 9. Waveform diagram of outputting C134 R after vvolume adjustment: 10.C135 C waveform diagram in Cyber Logic state: 11. C136 (SL) waveform diagram in Cyber Logic state: - 52 -...
  • Page 57 12. C137 (SR) waveform diagram in Cyber Logic state: 13. Output to flat cable XS8 after power amplification, pin 1 (L) waveform diagram: 14. Output to flat cable holder Xs8 after power amplification, pin 2 R waveform diagram: - 53 -...
  • Page 58 15. Output to flat cable holder XS8 after power amplification, pin 3 C waveform diagram: 16. Output to flat cable holder XS8 after power amplification, pin 4 (SL) waveform diagram: 17. Output to flat cable holder XS8 after power amplification, pin 5 (SR) waveform diagram: - 54 -...
  • Page 59 18. P_CHARGE waveform diagram after signal being detected: 19. P_ADINTO waveform diagram after signal being detected: Note: C138 (SW) has waveform only when bass enhancer is in off state. - 55 -...

  • Page 60: Key Point Voltage

    3.4.2 Key point voltage 1. Power board: VC+=43.5V VC-=-43.5V VD113 cathode terminal 12.8V (19.3V when in standby) Vd111 cathode terminal 6.3V (DV when in standby) P-RC=0V (4.8V when in standby) 2. Power amplifier board: L7812 pin 3 +12V L7912 pin 2 12V TDA7265 pin 3 +20V Pin 6 20V over 5.3V (0V when in standby)

  • Page 61: Section Five Function Introduction To Ic

    Section Five Function Introduction to IC 3.5.1 function introduction to 4558 1. Description The RC4558 and RM4558 devices are dual general-purpose operational amplifiers with each half ？ electrically similar to the A741 except that offset null capability is not provided. The high common-mode input voltage range and the absence of latch-up make these amplifiers ideal for voltage-follower applications.

  • Page 62: Function Introduction To Pt2399

    Description PIN No. Symbol Negative Power Supply VCC– Non-Inverting Input Pin 2 2IN+ Inverting Input Pin 2 2IN– Output 2 2OUT Positive Power Supply VCC+ 3.5.2 function introduction to PT2399 1. DESCRIPTION PT2399 is an echo audio processor IC utilizing CMOS Technology which is equipped with ADC and DAC, high sampling frequency and an internal memory of 44K digital processing is used to generate the delay time, it also feature an internal VCO circuit in the system clock, thereby , making the frequency easily adjustable.

  • Page 63: Function Introduction To Cd4051

    PIN No. Symbol Description External capacitor OP1-OUT External capacitor 1 output OP1-IN External capacitor 1 input OP2-OUT External capacitor 2 output OP2-IN External capacitor 2 input LPF2-IN Low pass filter 2 input LPF2-OUT Low pass filter 2 output LPF1-OUT Low pass filter 1 input LPF1-IN Low pass filter 1 output 3.5.3 function introduction to CD4051...

  • Page 64: Function Introduction To Cd4052

    PIN No. Symbol Description Channel selection port 1 Channel selection port 2 Positive Power Supply 3. TRUTH TABLE ON SWITH NONE 3.5.4 function introduction to CD4052 1. DESCRIPTION The CD4052 is a dual 4-channel multiplexer with two binary control inputs and inhibit input. The two binary control input signals select 1 of 4 pairs of channels to be turned on and connect it to the two outputs.

  • Page 65: Function Introduction To Cd4053

    PIN No Symbol Description Channel selection binary bit A Channel selection binary bit B X channel selection port 3 X channel selection port 0 X channel selection output X channel selection port 1 X channel selection port 2 Positive Power Supply 3.

  • Page 66: Function Introduction To Sm79164

    PIN No. Symbol Description Enable Negative Power Supply Select C Select B Select A Positive Power Supply 4. TRUTH TABLE ON SWITH NONE 3.5.6 function introduction to SM79164 1. Description The SM79164 series product is an 8 - bit single chip microcontroller with 64KB on-chip flash and 4K byte RAM embedded.
  • Page 67 2. Features ◆ 2.4V ~ 3.0V For V Version ◆ Working voltage: 3.0V ~ 3.6V For L Version ◆ 4.5V ~ 5.5V For C Version ◆ General 8052 family compatible ◆ 12 clocks per machine cycle ◆ 64K byte on chip program flash ◆...
  • Page 68 Symbol Define Name Function P1.5 P_ADSELB Selection spectrum sampling control B P1.6 P_ADSELC Selection spectrum sampling control C P1.7 P_GNB Spectrum gain control B RESET System reset P3.0 P_GNC Selection spectrum sampling control C P3.1 P_SELECT Mute/input detecting selection P3.2 P_ADINT0 Spectrum sampling interruption P3.3...

  • Page 69: Function Introduction To Pt2308

    Symbol Define Name Function P0.1 P_D1 Liquid crystal data D1 bit P0.0 P_D0 Liquid crystal data D0 bit 3.5.7 function introduction to PT2308 1. DESCRIPTION PT2308L is a Class AB stereo headphone driver chip utilizing CMOS Technology specially designed for dio applications.

  • Page 70: Function Introduction To Pt2222

    3.5.8 function introduction to PT2222 1. DESCRIPTION The PT2222is remote control transmitters utilizing CMOS Technology specially designed for use on infrared remote control applications .It is pin-to-pin compatible with NEC µPD6122 respectively. PT2222 is housed in 24 pins so and capable of controlling 64 function kens and 3 double keys. PT2222 may be paired with PT2225to construct a powerful remote control system.

  • Page 71: Function Introduction To Lm1875

    PIN No. Symbol Description KI/O1 Keyboard matrix line control KI/O0 Keyboard matrix line control Address code control Keyboard matrix row control Keyboard matrix row control 3.5.9 function introduction to LM1875 1. Description The LM1875 is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications.

  • Page 72: Function Introduction To Tda7265

    PIN No. Symbol Description Inverting Input Pin C -VEE Negative Power Supply OUTPUT Signal out C Positive Power Supply 3.5.10 function introduction to TDA7265 1. DESCRIPTION The TDA7265 is class AB dual Audio power amplifier assembled in the Multiwatt package, specially designed for high quality sound application as Hi-Fi music centers and stereo TV sets.

  • Page 73: Function Introduction To M62446

    3.5.11 function introduction to M62446 1. DESCRIPTION The M62446FP is 6 channels electric volume controlled 3-wire serial data. The IC is suitable for use in home-use audio systems and TV sets. 2. Features ◆ Electric volume: Volume level• • • • • 0dB ~ -79dB, - ？...

  • Page 74: Function Introduction To At24C02

    PIN No. Symbol Description RBASS2 R bass capacitance RBASS3 R bass capacitance RTRE R treble capacitance R capacitance R capacitance L capacitance L capacitance AVSS Negative Power Supply Lout L out Rout R out Cout C out SLout SL out SRout SR out SWout...

  • Page 75: High-Reliability

    – 1.8 (VCC = 1.8V to 5.5V) ◆ Internally Organized, 256 x 8 (2K), ◆ 2-wire Serial Interface ◆ Schmitt Trigger, Filtered Inputs for Noise Suppression ◆ Bi-directional Data Transfer Protocol ◆ 100 kHz (1.8V) and 400 kHz (2.5V, 2.7V, 5V) Compatibility ◆...

  • Page 76: Function Introduction To 7812

    ◆ Internal thermal overload protection ◆ Internal short circuit current limiting ◆ Output current in excess of 1 A ◆ Metal Fin is fully covered with Mold Resin 3. PIN DESCRIPTION PIN No. Symbol Description Input Input +18V Common Ground Output Output +12V 3.5.14 function introduction to 7812...

  • Page 77: Function Introduction To Lm324

    2. Features ◆ Suitable for CMOS ,TTL, the other digital IC’ s power supply ◆ Internal thermal overload protection ◆ Internal short circuit current limiting ◆ Output current in excess of 1 A ◆ Metal Fin is fully covered with Mold Resin 3.

  • Page 78: Function Introduction To Pt2315

    3. PIN DESCRIPTION PIN No. Symbol Description Output 1 Output 1 Pin Input 1- Inverting Input Pin Input 1+ Non-Inverting Input Pin Positive Power Supply Input 2+ Non-Inverting Input Pin Input 2- Inverting Input Pin Output 2 Output 2 Pin Output 3 Output 3 Pin Input 3-...

  • Page 79: Function Introduction To 74Vhc245

    ◆ Independent Mute Function ◆ Volume Control in 1.25 dB/step ◆ Low Distortion ◆ Low Noise and DC Stepping ◆ Controlled by IIC BUS Micro-Processor Interface ◆ Pin-to-Pin Compatible with TDA7315 3. PIN DESCRIPTION PIN No. Symbol Description Reference Power Supply Power Supply AGND AGND...
  • Page 80 CMOS low power dissipation. The VHC245 is intended for bi-directional asynchronous communication between data busses. The direction of data transmission is determined by the level of the T/R input. The enable input can be used to disable the device so that the busses are effectively isolated. All inputs are equipped with protection circuits against static discharge.

  • Page 81: Function Introduction To Cd4094

    PIN No. Symbol Description Side B Inputs or 3-STATE Outputs Output Enable Input Power Supply 3.5.19 function introduction to CD4094 1. Description The CD4094BC consists of an 8-bit shift register and a 3-STATE 8-bit latch. Data is shifted serially through the shift register on the positive transition of the clock. The output of the last stage (QS) can be used to cascade several devices.
  • Page 82 PIN No. Symbol Description Bit 4 output Top Bit output Qs’ Non-Qs Bit 8 output Bit 7 output Bit 6 output Bit 5 output Output enable Output enable Positive Power Supply - 78 -...

  • Page 83: Chapter Four Disassembly And Assembly Process

    Chapter Four Disassembly and Assembly Process In order to know the structure of audio power amplifier AV225T easily, visibly and quickly, now each key link of the disassembly and assembly process of the player is presented in means of pictures to prevent users from incorrect operating and damaging elements.
  • Page 84 C C C D D D A A A A A A B B B B B B C C C (5) Use electric screwdriver to unfix screws A and B in the (6) Pull down flat cable A, B and C on volume board. joint position of tuner and rear cover, and then unfix screws C and D in the joint position of video board and rear cover, then take them down.
  • Page 85 (11) Use electric screwdriver to unfix screws A~D in the (12) Use electric screwdriver to unfix screws A, B and C of point position of bottom casing and power amplifier power amplifier board, and then take down power board heat radiator and screw E in the joint place amplifier board.
  • Page 86 (17) Use electric screwdriver or “+”-shaped screwdriver to (18) Take hold of panel by right hand, fasten the bottom unfix screws A~E in the joint place of panel and casing D with 4 fingers of left hand, hold the panel bottom casing.
  • Page 87 (3) Use electric screwdriver to fix screws in two sides of (4) Use electric screwdriver to fix screws A~E in the joint surface casing. place of surface casing and bottom casing. (5) Install power board and then Use electric screwdriver to (6) Use electric screwdriver to fix screws of power board fix screws A~D in the joint place of rear cover and output and insert flat cable A D to proper position.
  • Page 88 A A A A A A B B B A A A C C C D D D (9) Install signal board and use electric screwdriver to fix (10) Use electric screwdriver to fix screws A, B, C, D of signal screw A of signal board.
  • Page 89 3. The process of changing LED back light source (1) Use nail to enter the gap between LCD screen and upper 2 Take LCD screen with thumb and forefinger of left hand, edge of LED back light source, and then exert strength press the whole board by right hand, take hold of the to put it up.
  • Page 90 4. Process of assembling LED back light source (1) Install LCD screen bracket clasp. (2) Install LED back light source. (4) Take LCD screen flat cable between thumb and (3) Use brand iron to solder pin A and B of LED back light forefinger of right hand, insert it into flat cable holder, source.

  • Page 91: Chapter Cinque Pcb Board & Circuit Diagram

    Chapter Cinque PCB board & Circuit diagram Section One PCB board 5.1.1 Video Board XC101 R107 TC103 R101 R102 -12V R105 C101 R103 TC104 N101 DGND TC101 C110T-2 2005.11.14 XS101 R106 - 87 -...

  • Page 92: Volume Board

    5.1.2 Volume Board XC101 XC102 DVDL DVDR VCDL VCDR R132 R130 XS19 C105 N102 N101 N104 R125 R162 C154 C152 R161 R126 C106 N107 R144 R150 TUNER_L +12V R147 R136 R134 TUNER_R C113 R124 C112 R135 R146 R195 P_TDO R145 R133 P_CLK R148...

  • Page 93: Signal Board

    5.1.3 Signal Board V109VD108 V110 V111 V107 SRQ1 3215T-2 LLC XS25 XS24 V102 2005-06-15 R152 R162 R139 V100 C129C134 C130 R106 R109 C100 N107 C119 VD106 XS23 V103 XP20 R170 OK-R C128 DISP XS13 C124 R171 R116 AGND V105 VD107 C240 AGND R110...

  • Page 94: Power Board

    5.1.4 Power Board C123 C124 C125 C121 R109 XL101 XL100 R120 L104 V103 R107 V101 V102 R115 C120 R122 R114 C119 L102 R119 C115 C114 C113 R118 C118 R113 L103 L100 RLY0 C116 P_RC R111 OVER R106 R116 Y100 VD110 L101 R100 R108...
  • Page 95 5.1.5 Key Scan Board - 91 -...

  • Page 96: Mic Board

    5.1.6 MIC Board C105 C101 R105 R106 XP24 C104 R104 R102 R108 R101 C106 R109R110 C102 C100 MIC-DET R107 C103 XP12 MIC1 MIC1 X100 R100 9215T-1 2004-08-09 - 92 -...
  • Page 97 5.1.7 audio power amplifying Board V121 V106 N106 R114 R144 R115 R130 R145 R160 C159 R129 R128 C109 R158 C119 R159 -12V GND+12V C137 C135 R126 R127 R157 R156 XP13 C136 VD101 C134 C157 C149 C148 C120 C151 C150 C124 C125 C131 C130C129...
  • Page 98 5.1.8 Surface layer of CPU Board R127R128R129R126 C114 XP101 C149R110 C109 P_MT R115 N101 N105 N104 C115 C110 P_RS P_RST P_D7 VD102 VD103 C139 VD118 VD116 P_D6 R144 VD119 VD101 P_D5 VD109 R142 VD117 P_D4 R141 R146 R147 P_D3 VD110 VD115 R170 P_D2...
  • Page 99 5.1.9 Bottom layer of CPU Board - 95 -...

  • Page 100: Section Two Circuit Diagram

    N101 CD4051 XC101 XCOM XS101 R101 100 R103 22 DGND R102 100 R108 22 VOUT -12V TC103 R104 100 CON6 R107 10k 220u/16V A(0) R105 B(1) C(2) VOUT TC101 V101 A1015 100u/16V C102 R109 1 R106 C103 C101 TC104 220u/16V...
  • Page 101 XS22 N101 CD4052 R130 1K TUNER_R P_CLK VCD-R D+5V P_DATA R132 47K DVD-R P_LT62446 5.1CH-R C143 C142 R152 47K R153 R154 R155 R156 47u/16V R197 1K +12V TUNER_L VCD-L L101 100uH -12V DVD-L OUT4 DVDD 5.1CH-L CON5 R111 1K A+6.8V R163 100 XC101A OUT3...
  • Page 102 XP101 P_RLY C135 DISP C134 DIST R162 P_OKT R164 VD114 R165 100K P_CLK 1N4148 35Hz P_SCART P_LT62446 R163 N106D 4.7K C136 P_LT4094 LM324 R166 C151 2.2u/50V P_SCL +12V P_SDA C132 R181 C131 R184 DGND DIST VD119 R157 5.6K D+5V R159 VD113 R160 P_DIST...
  • Page 103 LINE OUT XC100 SW-OUT C103 47P C104 47P R100 C100 10u/16V R109 R120 22K R132 27K R121 22K R101 43K V107 2N5401 -12V V100 R115 100K R127 39K N100B N100A S8050 R137 12K 4558 4558 R152 2.2K R169 4.7K R139 C113 BURST BURST...
  • Page 104 XS100 XS101 +12V P_RLY P_RLY XS25 -12V DISP DISP XS102 XS103 D+5V +12V P_REM DIST D+5V DIST DGND P_D0 P_D0 P_RST P_OKT P_D1 P_D1 P_RS P_CLK P_CLK R204 C202 47u/16V N200 PT2315 P_D2 P_D2 P_TCE P_TCE HEADPHONE 100/0.25W P_SCL P_D3 P_D3 P_LT62446 P_LT62446...
  • Page 105 C103 47u/100V R117 P+30V P+30V Rly0 220/0.5W P_RC V132 VD104 R105 R106 R113 V112 Over 2SC5248 2SD1047C 1N4148 CON4 R128 V114 C101 V105 2N5551 R101 R103 4.3K C108 2N5401 33p/500V R126 R129 R120 C110 V102 V103 10u/16V 0.25/7W 2.7K 2N5551 100/0.25W 1u/16V 2N5551...
  • Page 106 C100 VD100 1N5404 VD101 1N5404 FL100 C101 VD102 TO SWITCH FL101 T6.3AL250V 1N5404 From TRANS C102 CON2 CT7 103 C103 T8AL250V C108 VD103 0.22u 8200u/63V C106 CON2 1N5404 TO TRANS 0.1u VD104 CON2 V-RLY 1N5404 C104 C109 C107 0.22u VD105 8200u/63V 0.1u CON4...
  • Page 107 D+5V N100A PT2308 C106 330u/16V C103 R103 4.7K 10u/16V R109 R101 D+5V X100 XP24 D+5V R107 10K R105 D+5V DGND PH_SW PH_R C105 10u/16V PH_L CON5 R106 C102 100u/16V N100B PT2308 C107 330u/16V R104 4.7K C104 10u/16V R110 R102 R108 10K PH_SW R100 22K C100 103...
  • Page 108 XP104 P_RST' P_RS' P_RW' N102 74VHC245 XS102 N103 74VHC245 XS103 P_E' P_D0' P_D0 P_RST' P_RST P_D1' P_D1 P_RS' P_RS P_D2' P_D2 P_RW' P_RW P_D3 P_E' P_REM P_D4 CON8 P_D5 P_D6 DGND P_D7 DGND +3V3 +3V3 D+5V XP105 CON8 CON9 P_D3' C102 C103 P_D4'...

  • Page 109: Specifications

    Chart 6 BOM List MATERIAL MATERIAL NAME SPECIFICATIONS LOCATION CODE 6.1 VOLUME BOARD AV225T(RU) 5447607 0881743 IC F4558 DIP N108 ① 0882161 IC AZ4558 DIP N108 ① 0880445 IC 4558C DIP N108 ① 0880124 IC NJM4558D DIP N108 ① 0881393 IC...

  • Page 110: Ignal Disposal Board S

    02604389 CD CD11 16V4.7U±20%5×11C5 BELT 122,C129,C130,C133,C134,C135,C1 38,C136,C137 05800459 VOLTAGE REGULATOR DIODE 6.8V±5% 1/2W BELT VD100,VD101 05800099 VOLTAGE REGULATOR DIODE 9.1V±5% 1/2W BELT VD112 07801389 TRIODE 8050D BELT V106 1564153 PCB 2110T-1 6.3 SIGNAL DISPOSAL BOARD AV225T(RU) 5448199 - 106 -...
  • Page 111 MATERIAL MATERIAL NAME SPECIFICATIONS LOCATION CODE 0880230 IC PT2399 DIP N209 0880417 IC CD4053BCN DIP N205 0881430 IC CD4053BE DIP N205　　　　⑥ 0880379 IC LM7805 GOLD SEALED TO-220 N107 0880247 IC MC7805CT GOLD SEALED TO-220 N107　　　　⑦ 0880499 IC L7805CV GOLD SEALED TO-220 N107　　　　⑦...

  • Page 112: Ignal Disposal Board Ai Segment S

    3026724 PLASTIC BRACKET H=28.4mm AV230 4000197 SELF-TAPPING SCREW BT3×8 NICKEL 4000462 SELF-TAPPING SCREW BT 3×6H WHITE NICKEL 5448200 PCB SEMI-FINISHED PRODUCT 3215T-3 AV225T(RU)AI SEGMENT 5448201 PCB SEMI-FINISHED PRODUCT 7228-1 AV225T(RU) 6.4 SIGNAL DISPOSAL BOARD AI SEGMENT AV225T(RU) 5448200 W1,W3~W24,W26~W46,W48~59,W 2100003 CONNECTED CORDS F 0.6 SHAPED 7.5mm...
  • Page 113 MATERIAL MATERIAL NAME SPECIFICATIONS LOCATION CODE 00000449 CARBON FILM RESISTOR 1/6W18K±5% BELT R261 00000459 CARBON FILM RESISTOR 1/6W20K±5% BELT R202,R129,R218 R121,R123,R120,R128,R284,R134,R 00000469 CARBON FILM RESISTOR 1/6W22K±5% BELT 104,R105 00000489 CARBON FILM RESISTOR 1/6W27K±5% BELT R223,R132,R133 00000499 CARBON FILM RESISTOR 1/6W30K±5% BELT R260 00000509 CARBON FILM RESISTOR 1/6W33K±5% BELT...

  • Page 114: C Pu Board

    2N5401 BELT V103,V107,V108 07800329 TRIODE 9014C BELT V102,V110,V111,V200,V201,V202 07801389 TRIODE 8050D BELT V105,V101,V104,V100,V109 1564230 PCB 3215T-3 6.5 CPU BOARD AV225T(RU) 5448201 0260019 CD CD11 16V10U±20%5×11 2 C111,C112,C114,C115,C139 0260025 CD CD11 16V47U±20%5×11 2 C100 0260049 CD CD11 50V0.22U±20%5×11 2 C138 C118,C121,C124,C127,C130,C133,C 0260067 CD CD11 50V2.2U±20%5×11 2...

  • Page 115: C Pu Board-Smd

    9014C V101,V104,V102,V105,V100 0890283 PROGRAM CPU CPU225TRU-0 1850005 DUAL RANKIC SOCKET 40P DIP N100 5448209 PCB SEMI-FINISHED PRODUCT 7228-1-SMD AV225T(RU) 0260547 CD CD11C 16V1U±20%4×7 1.5 C104~C108 0260548 CD CD11C 16V2.2u±20%4×7 1.5 C100~C103 1970073 DUAL FLAT NEEDLE 2×4 11.6/16.5 2.54mm STRAIGHT FLEX XP104,XP105 6.6 CPU BOARD-SMD...

  • Page 116: Mplifier Board A

    MATERIAL MATERIAL NAME SPECIFICATIONS LOCATION CODE R111,R134,R139,R144,R149,R153,R 0090019 SMD RESISTOR 1/16W 4.7K±5% 0603 158,R163,R174,R185,R101 R108,R117,R125,R131,R133,R137,R 138,R142,R143,R147,R148,R152,R1 0090023 SMD RESISTOR 1/16W 10K±5% 0603 56,R157,R161,R162,R166,R172,R17 8,R179,R186,R187,R189,R212,R213, R214 0090024 SMD RESISTOR 1/16W 15K±5% 0603 R109 0090026 SMD RESISTOR 1/16W 22K±5% 0603 R100,R110,R132,R183 0090027 SMD RESISTOR 1/16W 27K±5% 0603 R126 0090029 SMD RESISTOR...
  • Page 117 MATERIAL MATERIAL NAME SPECIFICATIONS LOCATION CODE AV225T(RU) 5448202 W1,W16,W42,W43,W54,W61,W76, 2100003 CONNECTED CORDS F 0.6 SHAPED 7.5mm W77,W78 W8,W9,W15,W21,W24,W36,W37,W 2100004 CONNECTED CORDS F 0.6 SHAPED 10mm 45,W46,W48,W51,W57,W63,W69,W 71,W74,W80 W3,W18,W20,W22,W27,W31,W35, 2100006 CONNECTION CORDS F 0.6 SHAPED 12.5mm W41,W52,W59,W62,W65,W70,W73 W2,W14,W19,W26,W50,W53,W67, 2100007 CONNECTION CORDS F 0.6 SHAPEN 15mm...
  • Page 118 MATERIAL MATERIAL NAME SPECIFICATIONS LOCATION CODE 0010322 METAL OXIDE FILM RESISTOR 1/4W33K±5% R121,R151 0010321 METAL OXIDE FILM RESISTOR 1/2W33K±5% SHAPED 12.5 R111,R141 0200066 PORCELAINCAPACITOR 50V 221±10% 2.5mm C104,C114 0200333 POLYPROPYLENECAPACITOR 500V33P±10% NPO SHAPED 5mm C108,C118 0200306 POLYPROPYLENECAPACITOR 50V 47P±10% SHAPED 5mm C155,C156 0210030 TERYLENECAPACITOR 100V 104±10% 7mm...
  • Page 119 MATERIAL MATERIAL NAME SPECIFICATIONS LOCATION CODE V102~V104,V106~V107,V114,V117~ 0780026 TRIODE 2N5551 V119,V121~V122,V129 0780138 TRIODE 8050D V101,V116,V131 0780070 TRIODE 2SA1964E V133,V135 0780255 TRIODE 2SA940 V133,V135　　　　⒆ 0780257 TRIODE KSA940 V133,V135　　　　⒆ 0780072 TRIODE 2SC5248E V132,V134 0780021 TRIODE 2SC2073 V132,V134　　　　⒇ 0780258 TRIODE KSC2073 V132,V134　　　　⒇ 0780275 TRIODE 2SD1047C V112,V127 0780274 TRIODE...

  • Page 120: Urface Control Board S

    28×22×0.1 5230928 MICA PAD 18×13×0.1 5231418 MICA PAD 22×22×0.1 5232006 SOFT SPONGE SPACER 80×12×1.5 SINGLE-FACED,SOFT 6.8 SURFACE CONTROL BOARD AV225T(RU) 5448203 2100003 CONNECTED CORDS F 0.6 SHAPED 7.5mm W1～W12 0000133 CARBON FILM RESISTOR 1/6W4.7K±5% SHAPED 7.5 R105 0000137 CARBON FILM RESISTOR 1/6W10K±5% SHAPED 7.5...

  • Page 121: Ideo Input Output Board V

    1200566 LCD SCREEN SCREEN JCM12864V 58×28 5233838 PYROCONDENSATION SLEEVE @F 22 UL 5232576 SOFT SPONGE SPACER 11×11×11 DOUBLE-FACED,HARD 1563092 PCB 6228-1 6.9 VIDEO INPUT OUTPUT BOARD AV225T(RU) 5447611 0260027 CD CD11 16V100U±20%6×12 2.5 TC101 0260028 CD CD11 16V220U±20%6×12 2.5 TC103,TC104 0880271 IC...

  • Page 122: Ower Board P

    XP24 1980006 MICROPHONE SOCKET CK3-6.35-106 X100 1980030 MICROPHONE SOCKET CK3-6.35-19 MIC1 1564231 PCB 9215T-2 6.11 POWER BOARD AV225T(RU) 5448205 2100003 CONNECTED CORDS F 0.6 SHAPED 7.5mm W14,W16,W17,W22 W7,W8,W10,W11,W1,W2,L102,L103 2100004 CONNECTED CORDS F 0.6 SHAPED 10mm ,L104,W13 2100007 CONNECTION CORDS F 0.6 SHAPEN 15mm...
  • Page 123 MATERIAL MATERIAL NAME SPECIFICATIONS LOCATION CODE 0210022 TERYLENECAPACITOR 100V 223±5% 5mm C100,C101,C105,C111 0210029 TERYLENECAPACITOR 100V 104±5% 7mm C106,C107,C116~C120 0210031 TERYLENECAPACITOR 100V 224±10% 8mm C103,C104 0210213 TERYLENECAPACITOR 100V 224±5% 8mm C103,C104　　　　（25） 0200378 CERAMIC CAPACITOR @400VAC 472 ±10% 10mm VDE C102 0260028 CD CD11 16V220U±20%6×12 2.5 C113,C114 0260039 CD...

  • Page 124: R Emote Coneroller

    AV225T(RU) TRANSPARENCE 3003011 PANEL AV215T(RU) SUB-LIGHT BLACK 3027985 RIGHT COVER BOARD AV228 SILVER 3072003 LEFT COVER BOARD AV225T(RU) AETHER SILVER 3027989 DECORATIVE BOARD AV228 SILVER 3029042 POWER PRESS BUTTON BOARD AV215T(RU) SILVER 3027988 POWER BUTTON AV228 BLACK 3027992 FUNCTION PRESS-BUTTON...

  • Page 125: Ofeware Program S

    MATERIAL NAME SPECIFICATIONS LOCATION CODE 5232532 3M DOUBLE-FACE GLUE 65×46 AV228 5232675 SOFT SPONGE SPACER 8×8×6 SINGLE-FACED,HARD 5448203 PCB SEMI-FINISHED PRODUCT 6228-1 AV225T(RU) 5448204 PCB SEMI-FINISHED PRODUCT 9215T-2 AV225T(RU) 6.14 SOFEWARE PROGRAM AV225T(RU) 890283 0882087 IC SM79164C25P DIP N100 5156400 SIGN STICKER CPU225TRU-0 6.15 SN LASEL...
  • Page 126 MATERIAL MATERIAL NAME SPECIFICATIONS LOCATION CODE 2100002 CONNECTION CORDS F 0.6 5120013 YELLOW GLUEWATER 5120007 BLACK GLUE 3M4799# 5180452 QA ENVELOPCASE STICKER QA PASS 110×45 - 122 -...

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