4-6
No display on VFD, and buttons do not work
No
No
No
Yes
Yes
No display on VFD , and
buttons do not work
C heck w hether there is
correct contact betw een
C N 301 and CN6
Correct connection
Fix pow er supply boardtop
a pow er supply for should
electric circuit
C heck the U3’s pin 62,63,64 arrive
the CN6 connect condition
Correct connection
R eplace U 301 or VFD
Yes
Yes
Yes
No
check-24V +12V,VCC(+5v)
voltage on the pow er and
front board
C heck there are VSTB,
VS D A 0 and V S C K signals
on C N 303 on the front board.
1.C heck w hether bad solder exists on
U 301 and pins of VFD,
2.C heck w hether the circuit connected to
K302, K303, K304 and K301 is broken,
3.C heck w hether R 300, R 301 and R 302
are open-circuit.
Trouble shooting chart
CN6 (PIN 4 V.SCK ) CN 6 (PIN7 VSDA0)
www.freeservicemanuals.info
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