Troubleshooting Testing Upper Display Board50Figure 6-3. Optical Speed Sensor5. Verify that the toothed wheel is secured to the motor shaft and that the teeth run between the emitter/detectorposts. One side has the LED emitter and the other the light detector. The teeth must break the beam to createthe pulse train. Adjust as required.6. If the sensor is properly adjusted plug the treadmill in and turn it on.7. Verify that power is available to the emitter/detector:a. Disconnect the cable to the emitter/detector assembly.b. Check for +5VDC at the red and black wires of the cable’s connectorc. Check for +5VDC between the white and black wires of the connector.• If power is available, replace the speed sensor.• If power is not available, replace the cable.6.9. Testing Upper Display BoardThe upper display board is powered by DC voltage. The power is supplied by the PCB through the Upper WireHarness and then connected to the upper display board. By measuring the Black and Green wires on the UpperWire Harness you can confirm voltage from the PCB. Confirm the upper display is getting +12DC volts delivered toit. If the display board has the proper DC voltage supplied and does not light, see "Testing Membrane Panel".6.10. Testing Membrane PanelThe membrane panel has small micro switches laminated inside that transmit the user's key presses into treadmillfunctions. Enter Diagnostic Mode to confirm proper operation of the membrane panel. In this test mode you will beable to check each key on the membrane panel. By pressing a key, a numeric code appears, see Table 6-5 for acomplete list of these codes. If you see the appropriate code appear, then the key has failed and the membranepanel must be replaced.Note: The Pro Trainer and Executive Trainer control displays the text of the button pressed and so is not included in thefollowing table.WARNING The next step requires that power be applied to the circuitry. Appropriate caution mustbe used to avoid shock and shorting board contacts.Toothed Wheel Emitter/Detector
