Testing Components; Drive Motor; Vdc Power Supply - Landice 8700 Series Service Manual

Home and commercial treadmill

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Table Of Contents

Table of Contents

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 (+)

Motor minus(-)

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

220 VAC /180 VDC

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.