3-21
4. FLD DISPLAY CHECK
ELECTRICAL TROUBLESHOOTING GUIDE
FLD DISPLAY CHECK
OKOK
Check if both end voltage of F+, F- are over 1.85 V
VH : over 27 V.
Check CN300 connection.
If voltage isn’t over VH : 27 V, F- : 3 V
and, SW signal is not operation?
OK
Check output data IC500 Pin B3.
Check input data
IC500 Pin F2, B3, B1.
Replace IC500.
Replace VFD300.
Check each Pin voltage.
FLD light on?
OK
OKOK
Refer to SMPS troubleshooting.
Check
CN102 Pin13,14 input
voltage.
Check
CN300 connection and
power Pin14, 16,17
(VIN, F+, VDD).
Check
VFD300 voltage Pin27,
26, 31, 32 VH: over 27
V, SW Signal, F- : over
3 V is OK?
Check
IC500->VFD300 data
communication STB/
DATA/ CLK
Check VFD300.
Check IC500.
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
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