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Electronic Servomotor

  1. with servomotor out of car, use a fully charged 1 2 volt battery, test leads with a series connected bulb in the positive lead, and a known good ambient sensor.
  2. Set up test as shown in Figure. When test probes are applied, motor should turn clockwise and bulb should become brighter. Remove sensor and apply leads again, noting that the output shaft turns counterclockwise. Bulb should glow dimly as shaft turns and brightens when stops are reached. Bulb will also glow brightly if motor jams between stops.
  3. If motor shaft does not move, check battery condition and all connections, and all connections. Test lamp must be of correct type. Check ambient sensor if motor will only move to counterclockwise position. Output shaft must move to full clockwise (1 o'clock) and counterclockwise (10 o'clock) positions to be acceptable.
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