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No display on LED, and buttons do not work
No display on LEDD,
and buttons do not work
Check whether there is
correct
XS301 and XP2
check VCC(+5v) voltage
on the power and front
board
Check
signals
XP2on the front board.
Replace U301 or LED
Yes
contact
between
Yes
Yes
there
are
DATA
on
XS301
and
Yes
3-6
No
Correct connection
Fix power supply board top
No
a power supply for should
electric circuit
No
Check whether the circuit connected to
K301,K302, K303, K304 is open or is
broken.
Trouble shooting chart
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