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Precor c944, Service Manual, Page: 3 / 46

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C944 Treadmill

Page 3

Technical Specifications 

Physical Specifications

Length:

76 inches (193 cm)

Width:

Handrails 31.5 inches (80 cm)
Base 28.5 inches (72 cm)

Height:

44 inches (112 cm)

Running surface:

53 inches by 18 inches (135 cm by 46 cm)

Motor:

2 hp continuous duty DC (120 Vac and 240 Vac 
models)

Speed:

0.5 to 12 mph (0.8 to 19 kph)
10 mph is equivalent to a 6 minute mile

Incline:

-2%  to +12% grade

Power:

50/60 Hz 120 Vac
50/60 Hz 240 Vac

Weight:

276 lbs (119 kg)

Shipping Weight:

326 lbs (147 kg)

Summary of Contents for c944

Page 1: ...s product This document contains general product information software diagnostic procedures when available preventative maintenance procedures inspection and adjustment procedures troubleshooting proc...

Page 2: ...rocedures Perform inspection procedures when a trouble symptom points to a particular problem and after removing and replacing major components Many maintenance problems can be fixed by adjusting vari...

Page 3: ...inches 72 cm Height 44 inches 112 cm Running surface 53 inches by 18 inches 135 cm by 46 cm Motor 2 hp continuous duty DC 120 Vac and 240 Vac models Speed 0 5 to 12 mph 0 8 to 19 kph 10 mph is equiva...

Page 4: ...the LED test progresses This test is programmed to display the following LED illumination sequence a Every LED on the left display window illuminates simultaneously b The lower row of the display wind...

Page 5: ...roll by Note The following diagnostic test automatically searches for the upper and lower limit switches and the zero sense switch It also detects a non functional non moving lift 6 Watch the electron...

Page 6: ...ss ENTER to exit this mode Note The following mode allows manual control of the motor speed while displaying the power bits It is useful in determining if the system is having difficulties running the...

Page 7: ...the center dot SPEED Expands the third dot from the right SPEED Expands the second dot from the right QUICK START CHANGE Expands the far right dot 13 If the left display window column illuminates app...

Page 8: ...he mileage Procedure 1 Plug the power cord into the wall outlet then turn on the treadmill with the circuit breaker 2 With the PRECOR C944 banner scrolling press the INCLINE and SPEED keys simultaneou...

Page 9: ...is club selection is used to limit the maximum workout time the treadmill may be used during a workout The time may range from a minimum of 10 minutes to an absolute maxi mum of 240 minutes The defaul...

Page 10: ...cted units to change if the INCLINE UP key is released before the CHANGE key Selecting Maximum Workout Speed For PWM treadmills the maximum workout speed limit is between either 1 and 12 MPH or 1 and...

Page 11: ...problem occurs record the following information Model and serial number Software version number Note Determine the version number of the PROM as described in Procedure 2 1 or by looking at the label o...

Page 12: ...ut current under loaded and unloaded con ditions On PWM units log the power bits under loaded and unloaded conditions c Observe the LEDs on the electronic console Make sure that each LED lights as the...

Page 13: ...stance between the floor and the top of the front and back ends of the side rail see Diagram 4 1 Note The distance between the floor and the top of the front end of the side rail should be 9 inches 3...

Page 14: ...E key until the the front and back treadmill front and back treadmill measurements measurements are equal then are equal then press RESET press RESET 8 Turn off the treadmill with the circuit breaker...

Page 15: ...en power is applied to the treadmill the wires connected to the upper and lower limit switches carry 110 volts or 220 volts if you are servicing a 220 volt treadmill Turn off the treadmill and unplug...

Page 16: ...be actuated if the center of the wheel is slightly above or slightly below the widest point of the switch actuator However for best results adjust the position of the zero sense switch as described i...

Page 17: ...n continue with then continue with the next step the next step 14 Tighten the socket head bolts and washers that secure the switch bracket to the lift platform see Diagram 4 2 15 Replace the hood 16 C...

Page 18: ...upper display assembly to the upper handrail Carefully pull some excess interconnect cable out from the targa upright Rotate the display housing so that the rear of the upper PCA is facing upward and...

Page 19: ...adings match those listed in Tables 5 1 and 5 2 and one or more keys do not function replace the upper PCA 8 If the voltage readings in Table 5 1 are incorrect disconnect the keypad cable from the key...

Page 20: ...magnet mounted in the hub passes the hall effect sensor once per motor revolution The hall effect sensor send one pulse to the lift control system per revolution The system knows how far the lift tra...

Page 21: ...are not any adequate means of troubleshooting these components other than substituting known good components Replace only one component at a time If the component that you replaced does not correct th...

Page 22: ...re approximately 0 Vdc when the switch is not operated and approximately 5 Vdc when the switch is operated If the operated voltage is 0 Vdc or significantly low remove both blue wires from the zero se...

Page 23: ...measure the voltage between terminal 1 of J5 red wire and terminal 3 of J5 white wire on the lower PCA Slowly rotate the drive motor flywheel The voltage should read approximately 5 Vdc as a flywheel...

Page 24: ...breaker with a capacity of less than 20 amps the A C circuit must be corrected to be a 20 amp dedicated circuit before any reliable troubleshooting can be performed on the treadmill More importantly a...

Page 25: ...rcuit breaker If the circuit breaker is greater than 20 amps the circuit breaker should be replaced with a 20 amp circuit breaker If the circuit breaker is less than 20 amps the circuit breaker must b...

Page 26: ...from the lift motor capacitor but leave the remaining red wire connected to the capacitor terminal 3 Remove the black lift motor lead from the lift motor capacitor but leave the remaining black wire...

Page 27: ...C944 Treadmill Page 27 Diagram 6 1 Exploded view of the Lift Motor with Rotation Sensor Lift Motor Rotation Sensor Mounting Bracket Rotation Sensor Magnet Hub Magnet...

Page 28: ...19 14 Remove the screw and washer that secure the rotation sensor to the sensor bracket see Diagram 6 1 15 Position the revolution sensor at its mounting location 16 Position the screw and washer tha...

Page 29: ...ll frame 26 Return the treadmill to an upright position 27 Connect the black lift motor lead to the terminal of the lift motor capacitor that already has a black wire 28 Connect the red lift motor lea...

Page 30: ...it switch or Step 9 to remove the zero sense switch Removing the Upper Limit Switch WARNING When power is applied to the treadmill the wires connected to the upper and lower limit switches carry high...

Page 31: ...to the switch bracket see Diagram 4 2 8 If you are removing the zero sense switch THEN OTHERWISE Continue with the next step Skip to Step 11 Removing the Zero Sense Switch 9 Carefully remove the blue...

Page 32: ...aside the actuator block 15 Slide the actuator shaft from the switch bracket 16 If you are removing the switch bracket THEN OTHERWISE Continue with the next step Skip to Step 20 Removing and Replacing...

Page 33: ...tep 35 to replace the zero sense switch Replacing the Upper Lift Limit Switch 27 Position the limit switch at its mounting location 28 Replace the screws and washers that secure the limit switch to th...

Page 34: ...its mounting location 36 Replace the screws and washers that secure the limit switch to the switch bracket 37 Connect the blue wires disconnected in Step 9 to the switch terminals 38 Calibrate the li...

Page 35: ...from the mounting bracket Replacing the Lift Motor Capacitor 5 Position the lift motor capacitor in the capacitor mounting bracket Note Wire length and wire assembly configuration may limit the mounti...

Page 36: ...admill put a drop cloth underneath the treadmill when you perform Step 2 2 Place the treadmill on its left side 3 Remove the lower bolt and nut that secure the lift motor to the lift platform Note It...

Page 37: ...uts used to mount the lift platform are Kep nuts which do not require a separate washer If you do not use Kep nuts to mount the lift platform use washers when you mount the lift platform to the treadm...

Page 38: ...4 Each of these packages should be removed with a proper IC removal tool see the illustrations below 4 The IC s may inserted into their socket by hand by carefully aligning the notch on the IC with th...

Page 39: ...C944 Treadmill Page 39 Wiring Diagram 7 1 C944 SCR 120 Vac J9...

Page 40: ...C944 Treadmill Page 40 Block Diagram 7 2 C944 SCR 120 Vac...

Page 41: ...C944 Treadmill Page 41 Wiring Diagram 7 3 C944 SCR 240 Vac Snubber Black Black J3 J4 J1 J5 J2 J6 Blue Blue Brown...

Page 42: ...C944 Treadmill Page 42 Block Diagram 7 4 C944 SCR 240 Vac...

Page 43: ...C944 Treadmill Page 43 Wiring Diagram 7 5 C944 PWM 120 Vac F1 Lift Fuse 2A Slow Blow...

Page 44: ...C944 Treadmill Page 44 Block Diagram 7 6 C944 PWM 120 Vac...

Page 45: ...C944 Treadmill Page 45 Wiring Diagram 7 7 C944 PWM 240 Vac F1 Lift Fuse 2A Slow Blow...

Page 46: ...C944 Treadmill Page 46 Block Diagram 7 8 C944 PWM 240 Vac...

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