Precor c944 User manual

C944 Treadmill
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C944 Treadmill
Warning: This service manual is for use by Precor trained service providers only.
IfyouarenotaPrecorTrainedServicer,youmustnotattempttoserviceanyPrecorProduct;
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

C944 Treadmill
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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 C944 Treadmill Owner’s Manual, before you perform the maintenance
procedures in this manual.
Section Two, Software Features. Precor’s C944 Treadmill is programmed with several
diagnostic and setup features. This section contains the procedures you need to access the
diagnostic features on this treadmill.
Section Three, Checking Treadmill Operation. This section provides you with a quick way 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.
Section Four, Inspection and Adjustment Procedures. 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 various treadmill
components. This section also provides you with the step-by-step procedures required to make
these adjustments.
Section Five, Troubleshooting Procedures. The diagnostic and troubleshooting procedures
contained in this section should be performed when it is necessary to isolate a problem to a
particular component.
Section Six, Replacement Procedures. When a treadmill component must be replaced, go to
this section and follow the step-by-step procedures required to remove and replace the
component.
Section Seven, Technical Diagrams and Parts Lists. This section includes wiring diagrams,
and block diagrams for SCR and PWM C944 Treadmills.
General Information
For the latest exploded view, part number and part pricing information, visit the Precor dealer
website at “www.precor.com/Dealer”.

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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)

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Procedure 2.1 - Accessing the Diagnostic Software
The C944 Treadmill's diagnostic software consists of the following modes:
• Display Test
• Manual Lift Adjust
• Troubleshoot Lift
• Software Version
• Power Bits
• Keypad Test
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 SPEED ▲, SPEED ▼and INCLINE ▲
keys simultaneously or keys RESET,5,1,7,6.5.7.6,1, sequentially on units with standard
access codes (see Diagram 2.1).
3. Watch the electronic display as 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 window cycles from red to yellow to green.
c Diagonal lines of illuminated LEDs sweep across the left display window.
d The right display windows illuminate, then decrement from 8.8.8.8 to 0.0.0.0.
e The function LEDs illuminate simultaneously and then extinguish.
f Each function LED illuminates separately and then extinguishes.
4. If you do not observe the LED illumination sequences described in Step 3...
THEN... OTHERWISE...
Replace the upper PCA as described The LED passed successfully;
in Procedure 5.2 of the Commercial continue with the next step.
Treadmill Service Manual.

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Diagram 2.1. C944 Treadmill Display
5. With the ADJUST LIFT banner scrolling, press the INCLINE keys. The running deck will
incline when the INCLINE ▲ key is pressed and decline as the INCLINE ▼key is pressed.
The running deck will stop moving when the key is released. After the INCLINE keys are
pressed, the message, PRESS ENTER WHEN FINISHED will scroll 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 electronic console. If the three limit switches are adjusted correctly, the following
series of messages is displayed on the electronic console:
GOING TO TWELVE PERCENT
AT TWELVE PERCENT
GOING TO UPPER LIMIT
GOING TO NEG TWO PERCENT
AT NEGATIVE TWO PERCENT
GOING TO LOWER LIMIT
GOING TO ZERO
7. If all of the messages listed in Step 6 are displayed on the electronic console...

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THEN... OTHERWISE...
The treadmill lift switches are Press RESET to return to the PRESS
calibrated correctly, press ENTER ENTER FOR PROGRAMS prompt,
to continue. then calibrate the lift systems
described in Procedure 4.1.
Note:
Software revision changes can only be made by replacing the currently installed PROM. The
revision of the software does not change by resetting the system. Some software updates may
require the user to perform a system reset.
Software numbers are invaluable for tracking and identifying problems and keeping abreast of
changes to the operation and features of the product.
8. The message VERSION scrolls across the display and will continue to do so while you hold
any key down. When the key is released you will see the software version number displayed
in the middle right seven-segment display. Press 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 motor and belt.
9. The message POWER BITS scrolls across the display once. Two numbers appear in the
right upper and right middle seven-segment displays. The upper number is the power bits
and the lower number is the requested speed in miles-per-hour (or kilometers-per-hour).
Press the SPEED ▲key to start the motor. The SPEED ▲, SPEED ▼, STOP and ENTER
keys are active in this mode.
10. Press the SPEED keys while you watch the right display window. The power bits number
increments as the SPEED ▲key is pressed and decrements as the SPEED ▼key is
pressed.
11. Press either the STOP key or the ENTER key to stop the motor and exit this diagnostic.
Press the SPEED ▼key until zero MPH (or KPH) is attained if you wish to stop the motor but
not exit this diagnostic.
Note:
The keypad test is useful for troubleshooting stuck or non-operating keys on the keypad.

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12. Press each key listed below. Verify that each single dot expands to four dots as the
appropriate key is pressed.
ENTER Expands the far left dot.
INCLINE ▼Expands the second dot from the left.
INCLINE ▲Expands the third dot from the left.
STOP/RESET Expands 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 appropriately as each key is pressed...
THEN... OTHERWISE...
The keypad test passed successfully; Troubleshoot the upper PCA and
continue with the next step. keypad as described in Procedure 5.1
of this appendix.
14. End the keypad test by pressing the INCLINE ▼and SPEED ▲keys simultaneously.

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Procedure 2.2 - Displaying the Treadmill Odometer
This procedure displays total distance (in miles or kilometers) the treadmill has operated. The
odometer cannot be reset.
Note:
The odometers get updated at the end of the course. If a user shuts off the unit while in the
middle of a course, the odometer will not be updated and the user will have essentially lost the
mileage for that session. Pressing RESET displays the PRECOR C944 banner and accumulates
the 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
simultaneously or keys RESET,6,5, sequentially on units with standard access codes.
Note:
The right display window displays total miles or kilometers on the treadmill (see
Diagram 2.2). The top display window shows the most significant bits of the number; the lower
display window shows the least significant bits of the number. The number displayed is
102,187,723 (in miles or kilometers).
3. Press ENTER to return to the PRECOR C944 banner.
Diagram 2.2. - Odometer Display
0001
0218
7723

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Procedure 2.3 - Changing Club Settings
This procedure allows you to change the following club settings:
• English Standard /Metric Units
Selecting United States standard units causes data to be displayed in feet, miles and
pounds. Data is displayed in meters, kilograms and kilometers if metric units are selected.
• Maximum Speed
This selection is used to artificially limit the maximum speed the treadmill can attain when a
user is working out.The C944 Treadmill can attain an absolute maximum speed of 12.0
MPH (20.0 KPH) for PWM units and 10.0 MPH (16.0 KPH) for SCR units. This speed selec-
tion mode cannot exceed these speeds, but rather speeds may be selected that are lower
than these maximums.
• Maximum Workout Time
This 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 default from the factory is 60 minutes.
Procedure
1. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
2. If you wish to verify the measurement standard the treadmill is currently using continue with
the next step. If you wish to change the measurement standard the treadmill is using, skip to
Step 5.
Checking the Measurement Standard
3. Press ENTER until the WEIGHT indicator light appears.
4. Watch the number displayed in the left display window while you press the SPEED ▲key
five or six times.
Note:
If the treadmill is using United States standard units, the numbers in the left display window are
repeatable multiples of 5 (such as 160, 165, 170, 175, etc.). Otherwise, the treadmill is using
metric units.

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Changing the Measurement Standard
5. With the PRECOR C944 banner scrolling, press the SPEED ▲and QUICK START/
CHANGE keys simultaneously or keys RESET,5,6,5,1,5,6,5, sequentially on units with
standard access codes. A message indicating the last selected units (either U. S.
STANDARD UNITS or METRIC UNITS) scrolls across the display.
6. Use the SPEED or INCLINE keys to select the alternate measurement standard.
Note:
Holding the INCLINE UP and CHANGE keys at the banner may cause the last selected 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
20 KPH. Maximum workout speed limits for SCR C944 treadmills range between 1 and 10 MPH
or 1 and 16 KPH.
7. With the last currently selected maximum speed displayed on the L.E.D. matrix, use the
SPEED or INCLINE keys to designate a workout speed limit. Press ENTER when the
desired speed appears.
Selecting Maximum Workout Time
8. With the last currently selected maximum time displayed on the L.E.D. matrix, use the
SPEED or INCLINE keys to designate a workout time limit. Press ENTER when the desired
time appears.