Precor 9.31 Service Manual
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Precor 9.31 Service Manual

Precor 9.31 Service Manual

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See also: Owner's Manual
9.31, 9.33, 9.35 Treadmill
9.31, 9.33, 9.35 Treadmill
Warning: This service manual is for use by Precor trained service providers only.
If you are not a Precor Trained Servicer, you must not attempt to service any Precor Product;
Call your dealer for service.
This document contains information required to perform the majority of troubleshooting, and
replacement procedures required to repair and maintain this product.
This document contains general product information, software diagnostic procedures (when
available), preventative maintenance procedures, inspection and adjustment procedures,
troubleshooting procedures, replacement procedures and electrical block and wiring diagrams.
To move directly to a procedure, click the appropriate procedure in the bookmark section to the
left of this page. You may "drag" the separator bar between this page and the bookmark section
to change the size of the page being viewed.
© 2003 Precor Incorporated
Unauthorized Reproduction and Distribution Prohibited By Law
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Summary of Contents for Precor 9.31

  • Page 1 9.31, 9.33, 9.35 Treadmill Warning: This service manual is for use by Precor trained service providers only. If you are not a Precor Trained Servicer, you must not attempt to service any Precor Product; Call your dealer for service. This document contains information required to perform the majority of troubleshooting, and replacement procedures required to repair and maintain this product.

  • Page 2: Section One - Things You Should Know

    About This Appendix Section One, Things You Should Know. This section includes technical specifications. Read this section, as well as the 9.31, 9.33 or 9.35 Treadmill Owner’s Manual, before you perform the maintenance procedures in this manual. Section Two, Software Features. Precor treadmills are programmed with several diagnostic and setup features.

  • Page 3: Technical Specifications

    55 inches (140 cm.) Running surface: 20 inches by 57 inches (51 cm. by 145 cm.) Motor: 2.75 (9.31, 9.33), 3.0 (9.35) hp. continuous duty Speed: 0.5 to 11 mph (0.8 to 18 kph) 10 mph is equivalent to a 6 minute mile...

  • Page 4: Procedure 2.1 - Accessing The Hardware Validation Program

    Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker. Press keys RESET,5,1,7,6,5,7,6,1, sequentially. If you are testing a 9.33 or 9.35 treadmill continue with step 4. If you are testing a 9.31 treadmill skip to step 31.
  • Page 5 9.31, 9.33, 9.35 Treadmill The display will momentarily read KEYBOARD TEST. The keyboard test will place two dots on the display for each key on the display, including the numeric keypad. Pressing a key will cause the upper of the two dots associated with the key to go out.
  • Page 6 30. The belt power test is the last test in the diagnostics routine. Press the RESET or the ENTER key to exit the diagnostics routine. Diagram 2.2 - 9.31 Display 31. The keys on the display are hypothetically numbered 1 to 7 from left to right. See Diagram 2.2.
  • Page 7 37. Press and hold the RESET or SELECT key to continue to the heart rate test. 38. If the 9.31 is not equipped with the heart rate option, the message NO HR RECEIVER will be displayed indicating that a heart rate receiver was not detected.
  • Page 8 9.31, 9.33, 9.35 Treadmill 50. It is suggested that you perform this test on a treadmill known to be in excellent operating condition. Note the values displayed at a fixed speed (such as 3 MPH) and your body weight. Those values may then be used to benchmark the operation of treadmills you are diagnosing.
  • Page 9 Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker. Press the keys RESET,6,5, sequentially. If you are testing a 9.33 or 9.35 treadmill continue with step 4. If you are testing a 9.31 treadmill skip to step 19.
  • Page 10 9.31, 9.33, 9.35 Treadmill 14. The error log will store up to 10 error conditions. The errors are logged with the most recent error in position one. When a new error condition occurs, each existing error is pushed down one position in log. If there was an error in position 10 when a new error was logged, the error that was in position 10 will be lost.

  • Page 11: Procedure 2.3 - Accessing The User Parameter Program

    Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker. Press keys RESET,5,6,7,1 sequentially. If you are testing a 9.33 or 9.35 treadmill continue with step 4. If you are testing a 9.31 treadmill skip to step 17.
  • Page 12 9.31, 9.33, 9.35 Treadmill 16. Press the ENTER key to select the next user name or to exit the program. 17. The display will read SELECT UNITS: and scroll either US STANDARD or METRIC. 18. Use the keys to select the desired measurement units.

  • Page 13: Procedure 2.4 - Documenting Software Problems

    9.31, 9.33, 9.35 Treadmill Procedure 2.4 - Documenting Software Problems When a problem is found with the software in the upper or lower PCA, record the information listed below. When a problem occurs, record the following information: • Model and serial number •...
  • Page 14 9.31, 9.33, 9.35 Treadmill Section Three - 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.

  • Page 15: Procedure 4.1 - Calibrating The Lift Motor

    9.31, 9.33, 9.35 Treadmill Procedure 4.1 - Calibrating the Lift Motor Set the treadmill circuit breaker in the “off” position and unplug the line cord from the wall outlet. Remove the hood. Place the treadmill on it’s right side. Remove hitch and clevis pins that secure the lift tube to the lift platform.
  • Page 16 9.31, 9.33, 9.35 Treadmill Plug the power cord into the wall outlet, set the treadmill circuit breaker in the “on” position. Press keys RESET, 5,1,7,6,5,7,6,1, sequentially to enter the diagnostics routine. Refer to Procedure 2.1 and advance to the lift test. When the lift calibration number is displayed on...

  • Page 17: Procedure 4.2 - Adjusting Drive Belt Tension

    9.31, 9.33, 9.35 Treadmill Procedure 4.2 - Adjusting Drive Belt Tension Set the treadmill circuit breaker in the “off” position and unplug the line cord from the wall outlet. Remove the hood. Place the drive belt tension gauge on the drive belt as shown in Diagram 4.2.
  • Page 18 9.31, 9.33, 9.35 Treadmill Re-install the hood per Procedure 6.11. Diagram 4.3 - Drive Belt Adjustment Drive Motor Mounting Bolt Plug the line cord into the wall outlet and set the treadmill circuit breaker in the “on” position. Check treadmill operation per Section 3.

  • Page 19: Procedure 5.1 - Troubleshooting The Keypad And Upper Pca

    9.31, 9.33, 9.35 Treadmill Procedure 5.1 - Troubleshooting the Keypad and Upper PCA If the function keys on the electronic console are unresponsive, the problem may be either the upper PCA or keypad. The keys on this unit are touch sensitive keys. It is necessary to use the keypad diagnostics to troubleshoot the key functions.
  • Page 20 9.31, 9.33, 9.35 Treadmill Carefully, lift the display housing front panel off of the display housing backing plate. Disconnect the heart rate cable and stop switch cable from the upper PCA. Disconnect the keypad connector from the upper PCA. See Diagram 5.2.
  • Page 21 9.31, 9.33, 9.35 Treadmill 16. If one or more keys do not function correctly, either the keypad (display housing) or upper PCA could be defective. Replace the display and repeat step 14. If the display housing did not correct the problem, re-install the original display housing and replace the upper PCA.

  • Page 22: Procedure 5.2 - Troubleshooting The Lift System

    9.31, 9.33, 9.35 Treadmill Procedure 5.2 - Troubleshooting the Lift System Lift System Description: The lift system on these units consists of an AC line voltage driven lift motor (120 Vac), and an internal 1 KΩ potentiometer for lift position identification. The lift motor contains two motor windings, one to operate the motor in an “upward”...
  • Page 23 9.31, 9.33, 9.35 Treadmill Insert the treadmill’s line in the AC outlet and set the circuit breaker in the “on” position. Set the treadmill in the manual program and press the LIFT key. If the lift motor operates normally, test treadmill operation per Section 3. If the lift motor still does not operate, retest the lift fuse per steps 2 &...
  • Page 24 9.31, 9.33, 9.35 Treadmill 14. If the resistance readings in step 13 are normal, replace the lower logic PCA per Procedure 6.3. 15. If you have performed all of the procedures above and have been unable to correct the problem, call Precor customer service.

  • Page 25: Procedure 5.3 - Troubleshooting The Speed Sensor

    9.31, 9.33, 9.35 Treadmill Procedure 5.3 - Troubleshooting the Speed Sensor Note: The speed sensor is a hall effect sensor that emits a pulse when a flywheel lobe passes between it’s transmitter and receiver. The speed control circuit processes the pulse train emitted by the speed sensor.
  • Page 26 9.31, 9.33, 9.35 Treadmill Measure the voltage between terminal 1 of J3. (red wire) and terminal 4 of J3 (black wire) on the lower PCA, see Diagram 5.2. The voltage should read approximately 5 Vdc. If the voltage is missing or significantly low, disconnect the speed sensor plug from the lower PCA.

  • Page 27: Procedure 5.4 - Troubleshooting The External A.c. Power Source

    Procedure 5.4 - Troubleshooting the External A.C. Power Source It is extremely important that any Precor treadmill be connected to and operated on a dedicated 20 amp A.C. circuit. A 20 amp dedicated circuit is defined as: a circuit fed by a 20 amp circuit breaker that feeds a single load.
  • Page 28 9.31, 9.33, 9.35 Treadmill The circuit breaker correctly feeds a single A.C. outlet but the neutral is common between several A.C. outlets. The common neutral lead must be removed from treadmill’s A.C. outlet and a new neutral lead from the treadmill’s A.C. outlet to the A.C. neutral distribution bar must be added.

  • Page 29: Procedure 6.1 - Replacing The Lift Motor

    9.31, 9.33, 9.35 Treadmill Procedure 6.1 - Replacing the Lift Motor Note: The replacement lift motor must be calibrated prior to installation. The defective lift motor is then removed and the calibrated replacement lift motor is installed. If the incline is at 0%, skip to step 3.

  • Page 30: Procedure 6.2 - Replacing The Lift Platform

    9.31, 9.33, 9.35 Treadmill Procedure 6.2 - Replacing the Lift Platform Set the treadmill circuit breaker in the “off” position. Remove the AC line cord from the AC outlet. Remove the treadmill hood. Carefully, lay the treadmill on it’s right side.
  • Page 31 9.31, 9.33, 9.35 Treadmill Diagram 6.2 - Treadmill Frame Trim Frame Trim Lift Platform Mounting Pin Front Check treadmill operation per Procedure 3. Page 31...

  • Page 32: Procedure 6.3 - Replacing The Lower Pca

    9.31, 9.33, 9.35 Treadmill Procedure 6.3 - Replacing the Lower PCA Set the treadmill circuit breaker in the “off” position. Remove the AC line cord from the AC outlet. Disconnect the lower PCA drive motor connector from the drive motor. Disconnect Both lift motor connectors, the speed sensor connector, the drive motor fan connectors, the lower PCA fan connector and the AC input wires from the lower PCA.
  • Page 33 9.31, 9.33, 9.35 Treadmill 10. Feed the three pin lift motor connector through the grommet in the lower PCA bracket and insert it in the J7 connector of the lower PCA. 11. Insert the large lift motor connector in the J1 connector of the lower PCA.

  • Page 34: Procedure 6.4 - Replacing The Speed Sensor

    9.31, 9.33, 9.35 Treadmill Procedure 6.4 - Replacing the Speed Sensor Set the treadmill circuit breaker in the “off” position. Remove the AC line cord from the AC outlet. Disconnect the plug from the J3 connector on the lower PCA.
  • Page 35 9.31, 9.33, 9.35 Treadmill Feed the speed sensor connector through the grommet in the lower PCA bracket and insert it in the J3 connector of the lower PCA. 10. Slowly rotate the flywheel to ensure that the flywheel lobes do not contact the speed sensor.

  • Page 36: Procedure 6.5 - Replacing Drive Motor

    9.31, 9.33, 9.35 Treadmill Procedure 6.5 - Replacing Drive Motor Set the treadmill circuit breaker in the “off” position and unplug the treadmill’s line cord from the AC outlet. Remove the hood. The drive motor and flywheel are balanced as a matched pair. Since the flywheel is balanced to a specific motor, flywheels should not be removed from one and installed on a different motor.
  • Page 37 9.31, 9.33, 9.35 Treadmill 16. Check treadmill operation per Procedure 3. Page 37...

  • Page 38: Procedure 6.6- Replacing The Circuit Breaker

    9.31, 9.33, 9.35 Treadmill Procedure 6.6- Replacing the Circuit Breaker Set the treadmill circuit breaker in the “off” position and unplug the treadmill’s line cord from the AC outlet. Remove the sheet metal screw that is approximately in the center of the treadmill dress panel.
  • Page 39 9.31, 9.33, 9.35 Treadmill Check treadmill operation per Section 3. Page 39...

  • Page 40: Procedure 6.7 - Replacing The Line Filter

    9.31, 9.33, 9.35 Treadmill Procedure 6.7 - Replacing the Line Filter Set the treadmill circuit breaker in the “off” position and unplug the treadmill’s line cord from the AC outlet. Remove the sheet metal screw that is approximately in the center of the treadmill dress panel.

  • Page 41: Procedure 6.8 - Replacing The Line Cord

    9.31, 9.33, 9.35 Treadmill Procedure 6.8 - Replacing the Line Cord Set the treadmill circuit breaker in the “off” position and unplug the treadmill’s line cord from the AC outlet. Remove the sheet metal screw that is approximately in the center of the treadmill dress panel.

  • Page 42: Procedure 6.9 - Replacing The Drive Motor Cooling Fan (9.35 Only)

    9.31, 9.33, 9.35 Treadmill Procedure 6.9 - Replacing the Drive Motor Cooling Fan (9.35 Only) Set the treadmill circuit breaker in the “off” position and unplug the treadmill’s line cord from the AC outlet. Remove the hood. Remove the brown and blue wires from the drive motor cooling fan.

  • Page 43: Procedure 6.10 - Replacing The Drive Motor Brushes

    9.31, 9.33, 9.35 Treadmill Procedure 6.10 - Replacing the Drive Motor Brushes Set the treadmill circuit breaker in the “off” position and unplug the treadmill’s line cord from the AC outlet. Remove the hood. Remove the screws that retain the drive motor brush cover. Carefully, remove the heavy paper cover from the brush access opening.
  • Page 44 9.31, 9.33, 9.35 Treadmill Replace the hood per Procedure 6.11. 10. Check treadmill operation per Procedure 3. Page 44...

  • Page 45: Procedure 6.11 - Removing And Replacing The Hood

    9.31, 9.33, 9.35 Treadmill Procedure 6.11 - Removing and Replacing the Hood Set the treadmill circuit breaker in the “off” position and unplug the treadmill’s line cord from the AC outlet. Remove the four bolts that mount the hood the treadmill. Note that only two front bolts utilize flat washers Remove the hood from the treadmill.

  • Page 46: Procedure 6.12 - Replacing The Prom

    9.31, 9.33, 9.35 Treadmill Procedure 6.12 - Replacing the PROM Anti-static kits (part number 20024-101) can be ordered from Precor. The PROM and the associated printed circuit assembly (PCA) are static sensitive. Anti- static devices must be used and all anti-static precautions must be followed during this procedure.

  • Page 47: Wiring Diagram

    9.31, 9.33, 9.35 Treadmill Wiring Diagram 7.1 - 9.31, 9.33, 9.35 Page 47...

  • Page 48: Block Diagram

    9.31, 9.33, 9.35 Treadmill Block Diagram 7.2 - 9.31, 9.33, 9.35 Page 48...

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9.359.339.33i9.35i

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