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Servo Assembly Test

  1. Disconnect 8-pin connector at amplifier. Connect ohmmeter between circuit No. 144 (Orange/Yellow wire) and circuit No. 145 (Gray/Black wire). Resistance should be 40-75 ohms. See WIRING DIAGRAMS  in this article.
  2. Connect ohmmeter between circuit No. 144 (Orange/Yellow wire) and circuit No. 146 (White/Pink wire). Resistance should be 100-150 ohms. Connect ohmmeter between circuit No. 147 (Pink/Light Blue wire) and circuit No. 148 (Yellow/Red wire). Resistance should be 20,000-30,000 ohms.
  3. Connect ohmmeter between circuit No. 147 (Pink/Light Blue wire) and circuit No. 149 (Brown/Light Green wire). Resistance should be 40,000-60,000 ohms. If resistance is not correct, check wiring and servo separately. Replace as necessary.
  4. Start engine and disconnect servo from amplifier. Connect battery positive to circuit No. 144 (Orange/Yellow wire). Connect battery ground to circuit No. 146 (White/Pink wire) and momentarily touch circuit No. 145 (Gray/Black wire) to ground.
  5. Servo arm should pull in and engine speed should increase. Servo arm should either maintain position or slowly release. When circuit No. 146 (White/Pink wire) is removed from ground, servo should release. Replace servo if any part of test fails.
CAUTION: If circuit No. 144 (Orange/Yellow wire) is shorted to circuits No. 146 (White/Pink wire) or No. 145 (Gray/Black wire), damage to amplifier may result.
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