English
LSU
Page 34
!
FAQ
§
Parts are getting too hot and/or start to smoke.
Disconnect the system from the mains immediately!
Possible cause: one or more components are soldered incorrectly.
à
Perform a visual check.
§
None of the LEDs lights.
Possible cause: Neither the connecting points 3 and 4 nor the
connecting points 3 and 5 are connected to each other when
applying the supply voltage.
à
Check the connections.
Possible cause: The assembly of the module is faulty (wrong
polarity of a component, "cold" soldering points, short circuit
between two adjacent soldering points).
à
Check the assembly.
Possible cause: The change-over switch is defective.
à
Exchange
the switch.
§
Both LEDs light at the same time.
Possible cause: The connecting points 4 and 5 are connected to
each other.
à
Check the connections.
Possible cause: The assembly of the module is faulty (wrong
polarity of a component, "cold" soldering points, short circuit
between two adjacent soldering points).
à
Check the assembly.
Possible cause: The change-over switch is defective.
à
Exchange
the switch.
If you cannot find the problem, please return the module for repair
(address on the cover page).
