PRECOR Treadmill 9.33 - 9.35 – Treadmill function check - Accessing hardware program – Drive belt tension adjustment – Lift motor calibration - Troubleshooting motor

Category: Treadmill Repair and Service 

Contents of this article 

• Treadmill operation check
• Accessing hard ware program menu
• Drive belt tension adjustment 
• Main motor troubleshooting  

PRECOR Treadmill 9.33 - 9.35

Checking Treadmill Operation
This section provides you with a quick method of checking treadmill operation. Check treadmill operation at the end of a maintenance procedure and when it is necessary to ensure that the treadmill is operating properly.
Procedure
1. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
2. Operate the treadmill in the Manual program. Adjust the speed of the running belt to 2–3 m.p.h. Operate the treadmill for at least 5 minutes.
a. Concentrate on the feel of the running belt and the sound of the drive motor and rollers. Be on the alert for unusual noises, smells, or vibrations.
b. Observe the LED’s on the electronic console. Make sure that each LED lights as the information corresponding to that LED is displayed on the electronic console.
c. Enter the diagnostics program and log the power bits under loaded and unloaded conditions.
3. Press the STOP key. When the treadmill comes to a stop, view the electronic console as the treadmill scans time, speed, distance and percent of incline.
4. Press the INCLINE UP key while viewing the electronic console. Confirm that the running bed inclines and the incline display increments to 15% as the INCLINE UP key is pressed.
5. Press the INCLINE DOWN key while viewing the electronic console. Confirm that the running bed returns to a level position and the incline display decrements to 0% as the INCLINE DOWN key is pressed.
6. Turn off the treadmill with the circuit breaker, then unplug the treadmill from the wall outlet.

Accessing the Hardware Program
The treadmill's diagnostic program consists of the following modes:
# Display Test
# Keyboard Test
# Heart Rate Test
# Machine Test
Procedure
1. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
2. Press keys RESET,5,1,7,6,5,7,6,1, sequentially. Use the numeric keypad to enter the number sequence. The ARROW keys will step you through the test modes listed above, allowing you to skip tests or perform only specific tests.
3. DISPLAY TEST.
4. Press the OK key to enter the display test. Press the OK or ENTER key several times to step through all of the LED’s on the display. Ensure that all of the LED’s illuminate. Press and hold the OK or ENTER key to exit the display test.

5. KEYBOARD TEST.
6. The keyboard test will place a dot on the display for each key on the display, including the numeric keypad. Pressing a key will cause the dot associated with the key to go out. Test all of the keys in this manner. Tug on the safety key lanyard, to ensure that the STOP key is activated.
7. Press and hold the OK or ENTER key to exit the keyboard test.
8. HEART RATE TEST.
9. The heart rate test will display the heart rate being received during this test from the hand held grips, chest strap transmitter or test transmitter.
10. The display will toggle between unfiltered and filtered heart rate readings. They will be prefixed “U” for unfiltered, “F” for filtered. When a heart rate signal is being accepted the
“heart” will blink and the heart rate will be displayed in the heart rate window and the main window. Test the heart rate in both the hand held and wireless (chest strap or test transmitter) modes.
11. Press the OK or ENTER key to exit the heart rate test.
12. MACHINE TEST.
13. There are two test modes in the MACHINE TEST, they are BELT SPEED and INCLINE. Use the ARROW keys to select the desired test.
14. BELT SPEED
15. Press the OK or ENTER key. POWERBITS will be momentarily displayed then the powerbit number will be displayed. The power bit level can be checked by starting the running belt.
16. Press the OK key to exit the belt speed test.
17. INCLINE
18. Press the OK or ENTER key. A/D will be momentarily displayed then the analog to digital lift position number will be displayed. The analog to digital lift position number represents the incline’s physical position. The A/D number is used to calibrate the incline. The incline must be calibrated when a new lift motor is installed. Press the RESET to exit the MACHINE TEST.

Adjusting Drive Belt Tension
1. Set the treadmill circuit breaker in the “off” position and unplug the line cord from the wall
outlet.
2. Remove the hood.
3. Place the drive belt tension gauge on the drive belt as shown.4. The gauge should read approximately 80 inch/pounds. The drive belt tension is acceptable

if it is in the range of 70 to 90 inch-pounds.
5. If the drive belt tension is less than 70 or greater than 90 inch/pounds, slightly loosen the four drive motor mounting bolts. The drive motor mounts on slotted holes allowing the drive motor to be move forward or rearward. Move the drive motor forward or rearwards, as required, until the belt gauge reads approximately 80 inch/pounds and tighten the four drive motor mounting bolts. See Diagram 4.3. Momentarily remove the drive belt tension gauge from the drive belt. Replace the drive belt tension gauge on the drive belt and re-adjust the drive belt tension, if necessary. Torque the four drive motor mounting bolts to 204 inch pounds (17 foot pounds).

6. Re-install the hood.

7. Plug the line cord into the wall outlet and set the treadmill circuit breaker in the “on” position.
8. Check treadmill operation.

Calibrating the Lift Motor
1. Set the treadmill circuit breaker in the “off” position and unplug the line cord from the wall outlet.
2. Remove the hood.
3. Place the treadmill on it’s right side. Remove hitch and clevis pins that secure the lift tube to the lift platform.

4. Plug the power cord into the wall outlet, set the treadmill circuit breaker in the “on” position.
5. Press keys RESET, 5,1,7,6,5,7,6,1, sequentially to enter the diagnostics routine. When the lift calibration number is displayed on the console, use the INCLINE UP or INCLINE DOWN  key to set the lift calibration number to 38.
CAUTION: While running the lift motor in the diagnostics mode it is possible to operate the lift motor beyond it’s normal range of motion. When you perform the next step, care must be taken not to jam the lift tube against the motor frame.

6. Press the RESET key to exit the diagnostics mode.
7. Set the treadmill circuit breaker in the “off” position, unplug the line cord from the wall outlet.
8. Rotate the lift tube clockwise, by hand, as far as possible. Then rotate the lift tube counterclockwise until the distance from the top of the lift tube to the lift motor is 1 inch. While rotating the lift tube, be sure the lift motor drive screw does not rotate. If the drive screw is rotated, return to step 4 and repeat steps 4 through 7.
9. Replace the clevis and hitch pins removed in step 3. Return the treadmill to an upright position.
10. Plug the line cord into the wall outlet, set the treadmill circuit breaker in the “on” position.
11. check the calibration of the lift system by performing the following steps:
a Press the INCLINE UP key until the console displays 15% incline.
b Press the INCLINE DOWN key to return to 0% incline.
12. Re-install the hood.

Troubleshooting the 3 Phase AC Drive Motor System
Circuit Description
The power control module converts single phase 120Vac or 240Vac into three phase variable frequency current for the AC drive motor. The motor speed is controlled by controlling the frequency of the drive motor current.
1. When taking voltage readings of the AC drive motor current, the readings will not be accurate because of the frequencies being used, however, they are indicative of the presence of drive motor voltage and relative frequency changes.
2. If the symptoms are the drive motor starts when you force the running belt to move and once running the drive motor runs “rough”, skip to step 10. If the drive motor will not start continue with step 3.
3. If the drive motor does not start, the power control module will only apply voltage for a couple of seconds before it shuts down. Therefore the voltage readings in the following step must be taken within the first couple of seconds after the treadmill is instructed to start the running belt.
4. Connect an AC voltmeter between terminals 4 & 5 of the OUTPUT connector on the power control module. See Diagrams 5.3 and 5.4. Set the treadmill’s on/off switch in the “on” position. Press the QUICK START key. If the power control module is supplying output, you will momentarily read approximately 55 Vac. Set the treadmill’s on/off switch in the “off” position.
5. Repeat the procedure in step 4 between terminals 4 & 6 of the OUTPUT connector on the power control module.
6. Repeat the procedure in step 4 between terminals 5 & 6 of the OUTPUT connector on the power control module.
7. If one or more of voltage readings in steps 4 through 6 are not present, replace the power control module. If the voltage readings in steps 4 through 6 are present, continue with step
8. Set the treadmill’s on/off switch in the “off” position. Disconnect the drive motor connector from the OUTPUT connector on the power control module. With an ohmmeter, measure between terminals 4 & 5, 4 & 6 and 5 & 6 of the drive motor connector. Each reading should be approximately 2.5Ω. If any of the readings are significantly high or open, replacement the drive motor.
9. Connect an AC voltmeter between terminals 4 & 5 of the OUTPUT connector on the power control module. See Diagrams 5.3 and 5.4. Set the treadmill’s on/off switch in the “on” position. Press the QUICK START key. If the power control module is supplying output, you will momentarily read approximately 55 Vac.
10. Repeat the procedure in step 4 between terminals 4 & 6 of the OUTPUT connector on the power control module.
11. Repeat the procedure in step 4 between terminals 5 & 6 of the OUTPUT connector on the power control module.
12. If one or more of voltage readings in steps 4 through 6 are not present, replace the power control module. If the voltage readings in steps 10 through 12 are present, skip to step 8.