17 Chapter 4
Display and
Image
system
Noise when
playback the
record/ no sound
1>. Check the F/W version, update F/W again;
2>. Playback the record to confirm if it is ok, in order
to eliminate the speaker circuit’s issue;
3>. Check if the Microphone unit is ok and connects
well;
4>. Check if the MIC record part’s circuit has no
wrong parts and is soldered well;
5>. Check if the TV connector is soldered well (play
with TV).
USB connecting
failure
1>. Check if USB connector is cold soldered or miss
soldered;
2>. Check if USB connector is OK;
3>. Check if Y1 crystal frequency of MCU/B is
12MHz;
4>. Check the F/W version, update F/W again;
5>. Check the USB_DET signal on MCU board is
normal.
Communica
tion system
TV no images
1>. Check if TV connector is ok, the AV_DET signal
on MCU board is normal;
2>. Check if Y1 crystal frequency of MCU/B is
12MHz;
3>. Check the F/W version, and update F/W again.
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