quickly Judgement the chips of Actions on ATJ2085, ATJ2051, ATJ2091          
       

       MP3-MP4 audio and video players, judgement inspection methods
        
      1. POWER open the first switch, or connecting MP3 standard charger,
         Observation screen, whether display text "or" icon symbols, not back-Bright,
        (Note: According to the model, because the screen is not the same, there are many).
         If no, or a blank screen,
         At this time in and PC online, PC-or any reaction,
         Disconnect the USB cable.

      2. Carefully disassemble players, observe whether the motherboard fracture, and electrical components there burned burst phenomenon.
         If not, without the use of static electricity iron, Qudiao lithium batteries,
        (Note: At this time the motherboard can not bring any power), digital multimeter resistance profile,
         Detection of power distribution circuit regulator adjustment, whether short-circuit, open circuit, disconnection, or induced to wear,
         Soft-excited to wear, and other issues.整机detected in a rough part of low-frequency filter capacitance,
         And whether there is a high-frequency filter capacitors short-circuit the phenomenon exists. (According to the model set to analysis).
     
      3. If there is no failure by the first two, all OK. At this time in the standard MP3 charger,
         And the USB cable connected to the USB MP3 player on the Block I and in preparation for live testing.
        
      4. Transferred to the digital multimeter DC voltage 20 V stalls,
         Direct control ATJ2085 detection chip, 23 feet -24 feet, connecting the two ends of the crystal voltage,
         Should be the normal 23 feet, 0.45 V to 0.98 V,
         Should be the normal 24 feet, 0.45 V to 0.98 V,
        (Note: To determine if the crystal is a good replacement of damaged crystal OK).

         If it has kicked-to-voltage, 0.0 V to 0.67 V,
         Another pin-to-voltage, 1.1 V to 2.48 V,
         However, to determine control and flash memory chips did not Xuhan point, if Xuhan points Welding 0 K
         Welding if not 0 K, for sure, this has damaged the main control chip, the replacement of OK.
        (Note: This test results, we must determine the distribution power supply voltage regulator circuit the normal adjustment).
     
      5. Actions (ATJ2085) dominate the chip, 23 feet and 24 feet on the two-voltage, if all the 0.0 V,
         May be a power supply circuit failure, repair.
         or the firmware damage and loss of incorrect procedures firmware
         In the detection of crystal at both ends of the voltage, whether normal,
         Members may be the first four mentioned: on the chip can determine whether damage control, replacing OK.

      6. If the master chip ATJ2085, 23 feet to 24 feet a 0.0 V, the other foot for the 1.1 V to 2.89 V,
         A finger touch-sensitive site, whether the temperature is too high, if temperature rise too high,
         This can also be judged chip damage control, replacing OK.
        
      7. MP3-MP4 \ series silent fault detection (ATJ2085) quality control methods:
         Maintenance of MP3-MP4 players at the trial of hand, the function keys are all normal,
         Connected PC, format, downloads, but also normal.
         The volume key transferred to the maximum, that voice has not.
         Open players, digital multimeter, stop the testing,
         Headset OUT Block I, and the surrounding circuit components, Xu Han no, no no open or short-circuit disconnection.
         In the digital multimeter transferred to DC voltage 20 V stalls, test control chip (ATJ2085)
         8 feet, 9 feet at both ends of voltage,
         0.84 V to normal as 1.76 V, (Note: This voltage level for the player OUT size of the test results).
         If the two-voltage of 0.0 V,
         or kicked with a voltage of 0.0 V, another pin voltage of the normal voltage 0.84 V to 1.76 V,
         Damage control chip can be identified,
         Another control chip (ATJ2085) temperature is too high,
         May also determine control chip (ATJ2085) the replacement of damaged OK.
        (Note: This test results, we must determine the distribution power supply voltage regulator circuit the normal adjustment).

      8. Mp3-mp4, a button, or more keys out of order, other features of normal,
        (Note: Make sure keys is a good motherboard line, no break,
          Array resistors, capacitors, without eradicating corruption, no open, no short-circuit phenomenon),
          Can also be identified: the main air chip (ATJ2085) damage, the replacement of OK.
     
      9. MP3 player, showed that the menu icon, a non-stop run right, run left or a non-stop,
        (Note: other parts of OK, the light of the first eight methods).
         May also determine control chip (ATJ2085) damage, the replacement of OK.
     
     10. Other models dominate the chip quickly determine whether the damage:
         Ruju of ATJ2051, ATJ2091
         And Ju argue empty chip (ATJ2085) judgement is the same method as IC pin Shao different.
         We can refer to the above, a judgement of the first nine methods to analyze,
         Will be giving top priority to industrial performance.