5. Troubleshooting flow chart for “Machine not power on” is shown in the picture 3.3.2.5:
N
Machine not power on
Whether
software upgrading
is available after connecting
with computer
Whether
it is normal
after upgrading
software
Change the main decode
chip
A
A
Y
Y
Y
Y
Y
Y
N
N
N
N
N
Whether
3.3V, 1.8V voltage output
is normal
Whether
crystal oscillator Y1
has normal
oscillation
Change crystal oscillator
Trouble is removed
Whether
reset circuit is normal
Check reset circuit
Test
whether DM,
DP resistance to
ground is
normal
Change the main decode
chip
Check USB terminal welding
Change the main decode
chip
Figure 3.3.2.5 Troubleshooting diagram for “Machine not
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