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–104–
Checking code Meaning, detecting method Cause Checking method & Countermeasure
Serial
transmission
abnormality
0403
If serial transmission cannot be
established between the MAIN and
INV boards.
1) Wiring is defective.
2) Switches are set wrong on the INV
board.
3) A fuse (F01) on the INV board is
defective.
4) The circuit board is defective.
Check 1, the connections, 2, contact
at the connectors and 3, for broken
wires in the following wiring.
CNRS2 - CNRS3
CNAC2 - TB1B
SW1-4 on the INV board should be
OFF.
If the fuse is melted, (if the resistance
between the both ends of fuse is ∞),
replace the fuse.
If none of the items in 1) to 3) is appli-
cable, and if the trouble reappears even
after the power is switched on again,
replace the circuit board by the follow-
ing procedure (when replacing the cir-
cuit board, be sure to connect all the
connectors, ground wires, etc. se-
curely).
1 If serial transmission is restored af-
ter the INV board only is replaced,
then the INV board is defective.
2 If serial transmission is not restored,
reinstall the INV board and replace
the MAIN board. If serial transmis-
sion is restored, the MAIN board is
defective.
3 If serial transmission is not restored
by 1 and 2 above, replace both
boards.
[3] Self-diagnosis and Countermeasures Depending on the Check Code Displayed
(1) Mechanical