Troubleshooting Si12-411A
178 Service Diagnosis
5.7 Shutter Drive Motor / Shutter Limit Switch Abnormality
Remote
Controller
Display
C7
Method of
Malfunction
Detection
The shutter open / close performance is detected by the limit switch attached on its structure. In
this way, the shutter drive motor and the shutter limit switch are checked for failure.
Malfunction
Decision
Conditions
When the shutter is open, the limit switch is closed.
Supposed
Causes
Shutter drive motor defective
Shutter limit switch defective
Shutter itself deformed (warped)
Shutter's sealing material too thick
Detection error by broken relay harness or disconnected connector
Detection error due to defective PCB (2)
Foreign substance in blow port
Troubleshooting
Check No.3
Refer to P.206
Turn off the power.
Check No. 3
Check the limit switch continuity.
Remove such substance.
Replace the limit switch.
Reconnect the connector or
replace the relay harness.
Replace the shutter drive
motor or the PC board (2).
Check the shutter's sealing
material.
Check the shutter for
deformation or its sealing
material.
(Q0346)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Foreign substance in
the shutter structure?
YES
NO
NO
NO
YES
Shutter closed?
NO
Shutter opening itself?
YES
YES
YES
NO
Relay harness
broken or connector
disconnected?
Limit switch on power?
Open the shutter and turn on the
power.
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