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No display on VFD, and buttons don' t work
No display, and buttons
Check whether the +5V
voltages from the CN301 on
the front board is normal.
Check the voltage from
R316 is normal
Check whether there is
OSC signal output from
R306
don' t work
Yes
Yes
Yes
Yes
Replace U301
4-10
No
Check the CN2' s connection on
the decoder PCB
No
Change R316
No
Replace R306
Trouble shooting chart
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