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

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LED CONFIGURATIONS: RELAY BOARD

The RELAY 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:
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.
VDC (green) – The VDC LED will light when it receives DC voltage from the DC power supply.
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.
UPSW (green) – This LED will illuminate when the low voltage dc is delivered from the upper display board
to the elevation UP relay. This low voltage dc is what energizes the coil of the relay.
DNSW (green) - This LED will illuminate when the low voltage dc is delivered from the upper display board
to the elevation DOWN relay. This low voltage dc is what energizes the coil of the relay.
BELTSW (green) - This LED will illuminate when the low voltage dc is delivered from the upper display
board to the belt (motor start) relay. This low voltage dc is what energizes the coil of the relay.
SPD (yellow) – The SPD LED flashes on and off (relative to speed) when the speed sensor is operating
properly.
PWM (yellow) – This LED will light when the upper board is sending a speed signal to the PWM. Both the
PWM LED and BELTSW LED must be lit for belt movement.