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No display on VFD, and buttons do not work
No display on VFD, and
buttons do not work
Check
voltage on main board is
normal
Check -28V,+12V voltage on
the
front board (JP1 3,5)
Check the front board
signals SCLK,SDA, STB
(JP2,3,4,5)
1.Check whether bad solder exists
on U3 and pins of VFD,
2.Check
connected to K1, K2, K3, K4, K5,
K6 is broken.
Replace U4 or VFD
Yes
every
supply
Yes
PSU(CN502.3,5)and
Yes
Yes
whether
the
circuit
Yes
4-1
No
Refer to Power supply board part
No
Fix the connection JP1 on front board
and CN502 on power board
No
Check the U4's pin 8,9,6 arrive the
condition JP2,3,4,5
No
Correct connection
Trouble shooting chart
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