SPORTS ART C51R, Repair Manual

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C51R/C51U Bike Repair Manual (Electronics) - Troubleshooting
Motor Voltage Test Procedure
1. Put multimeter to the 20 VDC setting. Place probes on the VR wires (brown and orange) on the drive
board as shown on 6-4-2.
2.Turn on unit power. The display lights up.
3.Press RESISTANCE LEVEL<
▲
> key. Drive board LED3 lights up. Normal reading: +4.80~+5.20 VDC.
Motor operates. Resistance increases.
4.Press RESISTANCE LEVEL<
▼
> key. Drive board LED4 lights up. Normal reading:
－
4.80~
－
5.20 VDC.
Motor operates. Resistance decreases.
5.If there is no voltage, inspect the transformer output voltage. See 6-1-1. If the transformer voltage is OK,
the drive board is bad. Replace it.
Motor Ohm Test
Simply put, if there is power to the motor, and the motor does not operate, it is bad. But what happens if
there is no power to the motor? Is there still a way to check the motor? Yes, you can perform an ohm test
on the motor. Motors with very high or low ohm readings are bad. High ohm readings indicate too
much impedance. Low readings, like 0 or 0.4, indicate an electrical “short,” and a reading of “OL”
indicates an “open,” a break in the motor. Please see 6-4-4 for ohm test instructions.
6-4-3