Precor 9.31 Manual
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Precor 9.31 Manual

Precor 9.31 Manual

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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.
© 2007 Precor Incorporated
Unauthorized Reproduction and Distribution Prohibited By Law
20081-116
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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

    Section Seven, Technical Diagrams and Parts Lists. This section includes wiring diagrams, and block diagrams for the 9.33 and 9.35 Treadmill. General Information For the latest exploded view diagram, part number and part pricing information, visit the Precor dealer website at “www.precor.com/connection”. Page 2...

  • Page 3: Procedure 2.1 - Accessing The Hardware Validation Program

    9.31, 9.33, 9.35 Treadmill Procedure 2.1 - Accessing the Hardware Validation Program The treadmill's diagnostic program consists of the following modes: • Display Test • Keyboard Test • Heart Rate Test • Machine Test Procedure Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
  • Page 4 9.31, 9.33, 9.35 Treadmill KEYBOARD TEST. 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.
  • Page 5 9.31, 9.33, 9.35 Treadmill Procedure 2.2 - Accessing the Information Display Program The information display will access the following data; • Odometer • Hour Meter • U Boot SW • U Base SW • Lower SW • Metrics Board SW •...
  • Page 6 9.31, 9.33, 9.35 Treadmill 12. Press the OK or ENTER key to exit the U Boot SW display U BASE SW 14. Press the OK or ENTER key. The U Base SW part number will be displayed. The U Base SW is the upper PCA operating system software.
  • Page 7 9.31, 9.33, 9.35 Treadmill 31. Press the RESET key to exit the information display. 32. Note: the error log can also be entered at any time by pressing and holding the RESET key for four seconds. Page 7...

  • Page 8: Procedure 2.3 - Accessing The User Parameter Program

    9.31, 9.33, 9.35 Treadmill Procedure 2.3 - Accessing the User Parameter Program This procedure allows you to change the following settings: • Select Units (9.31, 9.33) • Set Max Pause Time • Set Cool Down Time • Set Speed Limit Procedure Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
  • Page 9 9.31, 9.33, 9.35 Treadmill SET SPEED LIMIT 17. Press the OK or ENTER key. 18. Use the ARROW keys to set the maximum speed between 1 and 12 MPH. 19. Press the ENTER key to select the currently displayed speed limit.

  • Page 10: 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 11 Press the INCLINE key while viewing the electronic console. Confirm that the running bed returns to a level position and the incline display decrements to 0% (9.31, 9.33) or -2% (9.35) as the INCLINE key is pressed.

  • Page 12: 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 motor cover. Place the treadmill on it’s right side. Remove hitch and clevis pins that secure the lift tube to the lift platform.
  • Page 13 11. Check the calibration of the lift system by performing the following steps: Press the QUICK START key. Press the INCLINE key until the console displays 15% incline. Press the INCLINE key to return to 0% (9.31, 9.33) or -2% (9.35) incline. 12. Re-install the motor cover. Page 13...

  • Page 14: 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 motor cover. Place the drive belt tension gauge on the drive belt as shown in Diagram 4.2.
  • Page 15 9.31, 9.33, 9.35 Treadmill Re-install the motor cover. 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 16: Procedure 4.3 - Treadmill Belt Cleaning

    9.31, 9.33, 9.35 Treadmill Procedure 4.3 - Treadmill Belt Cleaning Procedure: First, check for proper operation of the safety stop key. Stand to one side of the treadmill. Insure that the stop key tether is hanging straight down from the stop key and is not wrapped around the handle bars.
  • Page 17 9.31, 9.33, 9.35 Treadmill Turn the power off. Place your hands on the towel and push it up and down the length of the running deck several times to clean the deck. Remove the towel. Safety Stop Key Tether It is recommended that this procedure be performed frequently to extend the life of the running belt and running deck.

  • Page 18: 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. Procedure Set the circuit breaker in the “on” position.
  • Page 19 9.31, 9.33, 9.35 Treadmill Carefully, lift the display housing front panel off of the display housing backing plate. Disconnect both keypad cables from the upper PCA. See Diagram 5.2. Note: If the STOP switch cable is disconnected or the STOP switch is activated or defective the message STOP SWITCH will be displayed.
  • Page 20 9.31, 9.33, 9.35 Treadmill 11. 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 9. If the display housing did not correct the problem, re-install the original display housing and replace the upper PCA.

  • Page 21: 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 A.C. 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 22 9.31, 9.33, 9.35 Treadmill Insert the treadmill’s A.C. line cord in the A.C. 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 23 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 24: 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 an optical sensor that emits a pulse when an interrupter lobe passes between it’s transmitter and receiver. The speed control circuit processes the pulse train emitted by the speed sensor.
  • Page 25 9.31, 9.33, 9.35 Treadmill Measure the voltage between terminal 1 of J3 and terminal 4 of J3 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. Measure the voltage between pins 1 &...

  • Page 26: 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 27 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 28 9.31, 9.33, 9.35 Treadmill Procedure 5.5 - Troubleshooting Heart Rate Circuit Description The hand held heart rate system is actually a dual system, that is, it can accept a heart rate signal from either the hand held heart rate contacts on the unit’s handlebar or from a Polar heart rate chest strap transmitter.
  • Page 29 9.31, 9.33, 9.35 Treadmill No hand held reading - Normal chest strap reading Access the diagnostic program (Procedure 3.2). Advance to the heart rate display portion of the diagnostic program. Verify that a hand held signal is not being accepted by firmly grasping both the right and left hand held contacts on the handlebars.
  • Page 30 9.31, 9.33, 9.35 Treadmill No hand held reading - No chest strap reading 11. Access the diagnostic program (Procedure 3.2). Advance to the heart rate display portion of the diagnostic program. Verify that neither a chest strap signal or a hand held signal is being accepted with either a heart rate test transmitter or a chest strap transmitter.
  • Page 31 9.31, 9.33, 9.35 Treadmill Procedure 5.6 - Running Belt & Deck Troubleshooting This procedure is to be used to determine the condition of the running belt and running deck combination. A clamp-on ammeter will be used to measure the treadmill’s A.C. input current under load.
  • Page 32 9.31, 9.33, 9.35 Treadmill If the peak A.C. current readings are greater than on a new running belt and deck combination but not approaching 20 amperes, the reading will give you an indication of the running belt and deck combination’s general condition.

  • Page 33: 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 34: 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 A.C. line cord from the A.C. outlet. Remove the treadmill’s motor cover. Carefully, lay the treadmill on it’s right side.

  • Page 35: 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 A.C. line cord from the A.C. outlet. Remove the treadmill’s motor cover. Disconnect the lower PCA drive motor leads (red and black) at the mid-point connector between the lower PCA and the drive, motor.
  • Page 36 9.31, 9.33, 9.35 Treadmill 10. Connect the incline motor cables to J1 and J8 of the lower PCA. 11. Dress all of the above wiring into the appropriate wire clips along their routing. 12. Insert the A.C. line cord from the A.C. outlet. Set the treadmill circuit breaker in the “on”...
  • Page 37 9.31, 9.33, 9.35 Treadmill Procedure 6.10 - Replacing the PROM 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 pro- cedure. Remove the printed circuit assembly per its associated procedure.

  • Page 38: 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 A.C. line cord from the A.C. outlet. Remove the treadmill’s motor cover. Disconnect the plug from the J3 connector on the lower PCA.

  • Page 39: 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 A.C. outlet. Remove the treadmill’s motor cover. The drive motor, speed sensor tooth wheel and flywheel are balanced as a matched pair.

  • Page 40: 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 A.C. outlet. Remove the treadmill’s motor cover. Remove the four screws that fasten the mounting panel to the treadmill.

  • Page 41: 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 A.C. outlet. Remove the treadmill’s motor cover. Make note of where the two blue, two brown and green/yellow are connected to the line filter.
  • Page 42 9.31, 9.33, 9.35 Treadmill Procedure 6.8 - Replacing the A.C. Input Module Set the treadmill circuit breaker in the “off” position and unplug the treadmill’s line cord from the A.C. outlet. Remove the treadmill’s motor cover. Remove the four screws that fasten the mounting panel to the treadmill. See Diagram 6.5.
  • Page 43 9.31, 9.33, 9.35 Treadmill Procedure 6.9 - Replacing the Drive Motor Brushes (Pacific Scientific Motor Only) Set the treadmill circuit breaker in the “off” position and unplug the treadmill’s line cord from the A.C. outlet. Remove the treadmill’s motor cover.
  • Page 44 9.31, 9.33, 9.35 Treadmill 10. Replace the treadmill’s motor cover. 11. Check treadmill operation per Procedure 3. Page 44...
  • Page 45 Two running belt gauges, Precor part number 20007-101, are required. It is important that this procedure be followed to maintain correct drive belt and running belt tension. When tension is removed from the running belt, the belt requires 24 hours for it to “relax”.
  • Page 46 9.31, 9.33, 9.35 Treadmill Slowly rotate the drive motor flywheel while pressing the drive belt off of the drive roller pulley. Continue until the drive belt “walks” completely off of the drive roller pulley. Drive Belt Mark Bolt Here Drive Roller Pulley Using a fine tip marker or scribe, place a mark on the right hand drive roller mounting bolt directly in front of the drive roller shaft.
  • Page 47 9.31, 9.33, 9.35 Treadmill 16. If the belt drifts to the right, slowly turn the right hand mounting bolt clockwise until the drifting stops. If the belt drifts to the left, slowly turn the left hand mounting bolt clockwise until the drifting stops. Only a very small adjustment should be required, 1/8 to 1/4 turn.
  • Page 48 This procedure is to be used to replace a take up roller while maintaining the running belt’s original tension and tracking settings. Two running belt gauges, Precor part number 20007-101, are required. It is important that this procedure be followed to maintain correct running belt tension.
  • Page 49 9.31, 9.33, 9.35 Treadmill Slide the replacement take up roller into the running belt and set it in its mounting position. Hand start both take up roller mounting bolts that were removed in step 5. Alternate tightening the two take up roller mounting bolts, in order to tighten both ends evenly, until both running belt gauges again read exactly 3%.
  • Page 50 Two running belt gauges, Precor part number 20007-101, are required. It is important that this procedure be followed to maintain correct drive belt and running belt tension. Over tensioning the belt will lead to premature running belt wear, premature driver roller bearing failure and premature take up roller bearing failure.
  • Page 51 9.31, 9.33, 9.35 Treadmill accuracy when the replacement drive roller is installed. Remove both drive roller mounting bolts. Remove the drive roller from the treadmill. Remove the running belt and deck from the treadmill. If both sides of the deck have been used, discard the deck.
  • Page 52 9.31, 9.33, 9.35 Treadmill 16. Slowly rotate the drive motor flywheel while pressing the drive belt onto of the drive roller pulley. Continue until the drive belt “walks” completely onto of the drive roller pulley. Be sure that the drive belt is fully onto and correctly aligned on the drive roller pulley.
  • Page 53 9.31, 9.33, 9.35 Treadmill Procedure 6.13 - Replacing Drive Motor Brushes (McMillan Motor Only) Set the treadmill’s on/off switch in the “off” position and remove the treadmill’s power cord from the A.C. outlet. Remove the treadmill’s motor cover. Remove the bolts that retain the treadmill’s power input panel and carefully move it out of the way to gain clearance to the front of the drive motor.
  • Page 54 9.31, 9.33, 9.35 Treadmill Place the brush wires in the drive motor cable clamp and fasten the cable clamp to the drive motor with the hardware removed in step 4. Place the brush wires in the cable clamp on the lift motor support and loop them to take up extra wire length as shown in the illustration above.
  • Page 55 9.31, 9.33, 9.35 Treadmill Wiring Diagram 7.1 - 9.31, 9.33, 9.35 UPCA Heart Rate Stop Switch D Pad Keypad Metrics PCA Line Filter Incline Motor LPCA Circuit Breaker Speed Sensor Drive Motor Page 55...
  • Page 56 9.31, 9.33, 9.35 Treadmill Block Diagram 7.2 - 9.31, 9.33, 9.35 Page 56...

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9.339.35

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