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No display on VFD, and buttons do not work
No display on VFD, and
buttons do not work
Check every supply voltage on
main
normal:XP4(PIN6:5V,PIN7:12V,
PIN10:-24V)
Check
signals(square-wave)VCLK,VD,
VSTB, (CN1:pin10,11,12),
1.Check the VFD board whether
bad solder exists on U2 and pins of
VFD
2.Check
connected to SW1, SW2, SW3,
SW4 are broken.
Replace U2 or VFD
Yes
board
is
Yes
the
front
board
Yes
whether
the
circuit
Yes
4-1
No
Refer to Power supply board part
No
Check the front board CN7's pin
1,2,3 arrive the condition CN1'pin
No
Correct connection
Trouble shooting chart
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