Led Configurations: Scr Lower Board - Landice L Series Diagnostic And Service Manual

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LED CONFIGURATIONS: SCR LOWER BOARD

The SCR lower board is designed with diagnostic LED lights. The LED's are color coded according to their
specific function. Green indicates a properly operating treadmill; the green lights should always be ON
when power is supplied to the treadmill. Yellow indicates a treadmill function. Red indicates a treadmill
malfunction. Here is a list of each LED and what it signifies:
MOTOR (yellow) – The MOTOR LED illuminates when dc (direct current) voltage is sent to the drive
motor. The LED gets brighter when the dc output is increased.
RLC (yellow) – The RLC (R = Reactance / L = Inductance / C = Capacitance) LED illuminates when the
filtering system is properly working. The filtering system includes the capacitor and filter choke. If there is a
short in either component then the RLC light will not come on.
DN & UP (yellow) – The DN and UP LED lights tell us if the elevation DN and UP relays are functioning
properly. When the LED lights, it tells us that the relay has energized and is sending high voltage (110vac
or 220vac) to the elevation motor.
AC PWR (green) – The AC PWR (Alternating Current Power) illuminates when AC line voltage is delivered
to the treadmill. It then passes through the in-line fuse (110)/s(220) and lights the AC PWR LED.
+12V (green) – When the proper AC voltage is delivered to the treadmill, passes through the in-line fuse/s,
through the full wave bridge rectifier (changes AC to DC), through the transformer (steps down DC to
+12vdc) then the +12V LED lights.
C. LIM (red) – The C.LIM or Current Limit LED should NEVER come on. This diagnostic light is used to
determine the condition of the treadbelt and deck. The SCR board has a built-in amp meter. When the
treadbelt belt and deck system wears, the amperage will increase. When this amperage reaches its max
limit, the lower board will shut down its power (treadbelt will slow down / low torque) to the drive motor and
the C.LIM LED will illuminate.