Service Manual MM18YJ-MM24YJ

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Measure the voltage of this foot to neutral
wire on the mainboard
Troubleshooting for
H6 malfunction
Stir the blade
with a tool to see whether
the blade rotates
smoothly
Is the
control terminal of PG m otor
connected tightly ?
Replace PG motor
End
yes
no
Is malfunction
elim inated
yes
no
Insert the control
ter minal of PG
motor tightly
no
no
Stir the blade by
hand to see whether
the blade r otate s
smoothly
Reinstal l the blade and
motor correctly
Is mal function
elim inated
no
no
yes
yes
Turn on the
unit again ; measure w hether the output
voltage on control terminal for PG motor
is mor e than 50 V within 1 min after the
louvers are opened
no
yes
yes
Is the motor
started up
no
Is malfunction
elim inated
yes
yes
yesno
yes
Is malfunction
elim inated
Tighten the screw; reassemble the blade, motor
and shaft bearing rubber base sub-assy to make
sure there is no foreign object between them
Replace the mainboard
with the same model.