Polytec OFV-511 - No Laser Beam

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If no laser beam is emitted, please check the following:
1. Is the connecting cable between the controller and the sensor head
installed correctly?
2. Are the jacks on the connecting cable screwed in securely?
2)9   3. Is the L ED LASER on the back of the sensor head lit up after switching the
controller on?
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4. Is the beam shutter on the back of the sensor head in position ON?
5. After approximately 20 minutes operation, does the housing of the sensor
head feel warm to the touch as normal, indicating that the laser is
operating?
2)9 6. Is the L ED LASER STANDBY on the front of the sensor head lit up after
switching the controller on?
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7. Is the beam shutter key LASER on the front of the sensor head pressed
once after switching the controller on?
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8. Is a break of the optical fiber cable visible?
:DUQLQJ 
$OZD\V disconnect from the mains EHIRUH checking the fuses!
:DUQLQJ 
$OZD\V disconnect from the mains EHIRUH checking the fuses!