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Precor C942 Service Manual

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C942 Treadmill
C942 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
Page 1

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  • Page 1 C942 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 C942 Treadmill Owner’s Manual, before you perform the maintenance procedures in this manual. Section Two, Software Features. Precor’s C942 Treadmill is programmed with several diagnostic and setup features.

  • Page 3: Technical Specifications

    C942 Treadmill Technical Specifications PHYSICAL SPECIFICATIONS Length: 76 inches (193 cm) Width: 28.5 inches (71.4 cm) Height: 50 inches (127cm) Belt: 57 inches by 18 inches (145 cm by 46 cm) Speed: 120 Volts: 0.5 to 10 mph (0.8 to 17.5 kmh)
  • Page 4 C942 Treadmill Procedure 2.1 - C942 Diagnostic Program (Units Built Before July 21, 1997) The M9.41S diagnostic program cycles through the following modes: Software Version Mode. Displays the PROM version number. LED Mode. Illuminates each of the LEDs mounted on the upper PCA.
  • Page 5 SPEED keys are pressed. Press STOP to return to the Enter Your Weight banner. Turn off the treadmill with the circuit breaker, then unplug the treadmill from the wall outlet. Diagram 2.1 - C942 Display Page 5...
  • Page 6 1 to 7 from left to right. Therefore, ENTER would be key 1, INCLINE would be key 2, etc. (see Diagram 2.1). Placing the C942 Treadmill in diagnostic mode causes the software to perform the following operations: Test the LED’s mounted on the upper PCA;...
  • Page 7 C942 Treadmill Note: When the running belt is started, the number of power bits will be displayed. Power bits represent the amount of power applied to the drive motor. Power bits are the product of selected speed and applied load.

  • Page 8: Procedure 2.3 - Displaying The Odometer (Units Built Before July 21, 1997)

    C942 Treadmill Procedure 2.3 - Displaying the Odometer (Units Built Before July 21, 1997) This procedure allows you to display the number of miles logged on the treadmill. Procedure Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.

  • Page 9: Procedure 2.4 - Displaying The Odometer (Units Built After July 20, 1997)

    C942 Treadmill Procedure 2.4 - Displaying the Odometer (Units Built After July 20, 1997) Units built after July 20, 1997 used the standard access codes. The keys on the display are hypothetically numbered for 1 to 7 from left to right. Therefore, ENTER would be key 1, INCLINE would be key 2, etc.

  • Page 10: Procedure 2.5 - Selecting U. S. Standard Or Metric Units (Units Built Before July 21, 1997)

    C942 Treadmill Procedure 2.5 - Selecting U. S. Standard or Metric Units (Units Built Before July 21, 1997) Selecting United States standard units causes information to be displayed in feet, miles and pounds. Information is displayed in meters, kilometers and kilograms if metric units are selected.

  • Page 11: Procedure 2.6 - Selecting United States Standard Or Metric Units (Units Built After April 1, 1996)

    C942 Treadmill Procedure 2.6 - Selecting United States Standard or Metric Units (Units Built After April 1, 1996) Units built after July 20, 1997 used the standard access codes. The keys on the display are hypothetically numbered for 1 to 7 from left to right. Therefore, ENTER would be key 1, INCLINE would be key 2, etc.

  • Page 12: Procedure 2.7 - Documenting Software Problems

    When a problem is found with either the PROM or upper or lower PCA’s, record the information listed below. If you isolated the problem to either the PROM, upper PCA, or lower PCA, include the information with the malfunctioning PROM or PCA when you ship it to Precor Customer Service.
  • Page 13 C942 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 14: Procedure 4.1 - Calibrating The Lift Motor

    C942 Treadmill Procedure 4.1 - Calibrating the Lift Motor Turn off the treadmill with the circuit breaker, then unplug the treadmill from the wall outlet. Remove the hood. Place the treadmill on its right side. Remove the bolt and nut that secure the lift tube to the lift platform.

  • Page 15: Procedure 5.1 - Troubleshooting The Keypad And Upper Pca

    C942 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. This troubleshooting procedure gives you the information you need to determine which of these components is malfunctioning.
  • Page 16 C942 Treadmill Table 5.2. Voltage Test Points (Function Keys Pressed) Place the positive At the electronic The voltmeter should voltmeter lead on... console, press... read between... Pin 3 of J4 ENTER 0 Vdc and 500 mVdc Pin 4 of J4...

  • Page 17: Procedure 5.2 - Troubleshooting The Optional Heart Rate System

    Plug the power cord into the wall outlet, then turn on the treadmill with the ON/OFF switch. If necessary use conductive spray (Precor part number 37364-101) to ensure good contact between the chest strap transmitter and the user, put on the heart rate chest strap transmitter.Enter the diagnostics program per Procedure 2.1 or 2.2.
  • Page 18 There is no need to continue with this procedure. Hold the Heart Rate Test Transmitter (Precor part number 20045-101) near the display housing. If the HEART RATE indicator on the electronic console blinks with the LED on the Smart Rate Test Generator...

  • Page 19: Procedure 5.3 - Troubleshooting The Lift System

    C942 Treadmill Procedure 5.3 - Troubleshooting the Lift System System Description The lift system is powered by a 120 Vac lift motor that uses two independent motors windings, one operates the motor in an upward direction and one operates the motor in a downward direction.
  • Page 20 C942 Treadmill Remove the P2 connector from the lower board. Using an ohmmeter, measure between terminals 1 and 3 of P2, between terminals 1 and 2 of P2 and between terminals 2 and 3 of P2. The measurements should be approximately 14.5Ω, 14.5Ω and 29Ω, respectively. If any of the measurements are significantly low, replace the lift motor.

  • Page 21: Procedure 5.6 - Troubleshooting The External A.c. Power Source

    Procedure 5.6 - 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 22 C942 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 23: Procedure 6.1 - Replacing The Lift Platform

    C942 Treadmill Procedure 6.1 - Replacing the Lift Platform Removing the Lift Platform Turn off the treadmill with the circuit breaker, then unplug the power cord from the wall outlet. WARNING Before continuing with this procedure, review the Warning and Caution statements listed in Section One of the Commercial Treadmill Service Manual.

  • Page 24: Procedure 6.2 - Replacing The Target Label

    C942 Treadmill Procedure 6.2 - Replacing the Target Label WARNING Always turn off the circuit breaker and unplug the treadmill before you remove the treadmill hood. Removing the Target Label Remove the hood. CAUTION The speed sensor is mounted on the motor casing. Exercise caution when you remove and replace the flywheel.

  • Page 25: Procedure 6.3 - Replacing The Lift Motor

    C942 Treadmill Procedure 6.3 - Replacing the Lift Motor WARNING Always turn off the circuit breaker and unplug the treadmill before you remove the treadmill hood. Removing the Lift Motor Remove the hood. Disconnect the lift motor wiring assembly from the lower PCA.

  • Page 26: Wiring Diagram 7.1 - C942

    C942 Treadmill Wiring Diagram 7.1 - C942 Page 26...

  • Page 27: Block Diagram 7.2 - C942

    C942 Treadmill Block Diagram 7.2 - C942 Page 27...

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