Landice 8700 - Manual (Page 32)

32
Testing Components
12 VDC POWER SUPPLY
Measure across the input terminals for AC line voltage (120/220VAC). Measure across the output
wires for DC voltage (9.0VDC to 18.0VDC is acceptable). If you confirm proper input voltage (AC) and
have no output voltage (DC) the DC power supply must be replaced.
Drive Motor:
Generation Test – all Landice drive motors (110 & 220) are direct current or DC. A DC drive
motor can produce (generate) a DC voltage when it’s manually rotated. The DC output is
linear to the speed the motor is rotated. To perform the “Generation Test” follow these steps:
1. Un-plug treadmill from wall outlet.
2. Disconnect drive motor from motor control board.
3. Connect DMM (Digital Multi-Meter) to the drive motor wires.
Note: Your DMM should be set on Volts DC (VDC)
Motor plus (+)
= Red test lead from DMM
Motor minus(-) = Black test lead DMM
4. Position your DMM so you can read it while standing on the treadbelt.
5. Start to manual push / run on the treadbelt.
Note: You are spinning the drive motor manually. The faster you spin the motor, the
higher the output of DC voltage will register on your DMM.
110 VAC treadmills use a 90 VDC drive motor. For every mile per hour you spin the drive
motor you will generate approximately 10 VDC output. So, at 1 mph you will measure 10VDC
+/- and at 9mph you will measure 90VDC +/-.
220 VAC treadmills use a 180 VDC drive motor (double the input voltage, double the size of
the drive motor). For every mile per hour (mph) you spin the drive motor you will generate
approximately 20 VDC output. So, at 1.0mph you will measure 20 VDC +/- and at 9.0mph you
will measure 180 VDC +/-.
If you measure very low DC voltage or zero DC voltage, first check the drive motor brushes
for condition. Motor brushes are the leading cause for drive motor failure. If the motor brushes
are worn below ¼” in length, replace them.
110 VAC / 90VDC Motor Brush part#70222
220 VAC /180 VDC Motor Brush part#70223
Alternate Test 1: Attach 9-volt battery to motor leads. There should be motor movement.
Alternate Test 2: Unplug Treadmill. Disconnect Drive Motor wires. Disconnect Drive Belt.
Hold black and white wires together. Spin flywheel. There should be resistance when wires
are connected.