Philips SDV434/19, Руководство по обслуживанию

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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
Check whether there is
correct contact between
CN301 and CN6
Correct connection
Fix power supply board top
a power supply for should
electric circuit
Check the U3’s pin 62,63,64 arrive
the CN6 connect condition
Correct connection
Replace U301 or VFD
Yes
Yes
Yes
No
check-24V+12V,VCC(+5v)
voltage on the power and
front board
Check there are VSTB,
VSDA0 and VSCK signals
on CN303 on the front board.
1.Check whether bad solder exists on
U301 and pins of VFD,
2.Check whether the circuit connected to
K302, K303, K304 and K301 is broken,
3.Check whether R300, R301 and R302
are open-circuit.
Trouble shooting chart
CN6 (PIN 4 V.SCK) CN6 (PIN7 VSDA0)