mp3修理（Mp3 repair）.docVIP

mp3修理（Mp3 repair） ATJ2085, ATJ2051, ATJ2091, the main control chip, good judgment method ATJ2051, ATJ2091, the main control chip, good judgment method For ATJ2051, ATJ2091, ATJ2085 actions, the main control chip, Whether the damage to quickly determine that shallow talk. MP3-MP4 audio and video player, the judgment method of inspection 1., first open the POWER or MP3 standard charger connected switch, Observe the display, no display text or icon, back light is not bright, (Note: according to the model, because the screen is not the same, there are many). If there is no display, or black, At this time, PC and PC in the machine on-line machine without any reaction, Unplug the USB cable. 2. careful observation, open player board has no fault, and no electrical components have burned burst phenomenon. If not, with no static electric iron, remove the lithium battery, (Note: this motherboard cant take any power), digital multimeter resistance profile, Detection of power supply voltage regulate distribution circuit, there is no short circuit, open circuit, break, or bowel wear, Wear soft bowel problems. In the low frequency part of rough detection of filter capacitor, And the high frequency filter capacitor is a short circuit phenomenon. (according to the model, to analysis). 3. if there is no second said fault, all OK. When the standard MP3 charger, And the USB line connected to the USB port on the MP3 player seat, ready to live detection. 4. digital multimeter to DC voltage 20V gear, Direct detection of main control chip ATJ2085, the 23 foot -24 foot and the connecting ends of the oscillator voltage, Should 0.45V to 0.98V, the normal value of 23 feet, Should 0.45V to 0.98V, the normal value of 24 feet, (Note: to determine if the crystal crystal is a good replacement of damaged OK). If there is a foot to ground voltage, 0.0V to 0.67V, The other foot to ground voltage, 1.1V to 2.48V, But to determine the main control chip and flash point if there is no weld, weld repairing