Precor C942 User manual

C942 Treadmill
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C942 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

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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 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. 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, Wiring and Block Diagrams and Parts List. This section includes wiring and
block diagrams for C942 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: 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)
(10 mph is a 6-minute mile)
Incline: 0% to +12% grade
Motor: 2 hp continuous-duty DC
Power: 50/60 Hz 120 Volts AC single phase
Weight: 265 lbs (119 kg)
DISPLAY FEATURES
Time
Segment time left
Minutes per mile/km
Distance
Speed
Calories pr minute
Total calories
Incline
ELECTRONIC COURSES
Manual
Interval (1:1 rest-to-work ratio)
Weight Loss (4:4 rest-to-work ratio)

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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.
Lift Mode. Allows you to verify that the lift calibration number increments and decrements as the
INCLINE keys are pressed.
Power Bits Mode. Allows you to verify that the power bits number increments and decrements
as the SPEED keys are pressed.
Note:
When the treadmill is in power bits mode and the SPEED ▲key is selected, the treadmill speed
will increase twice as fast as it does when the treadmill is in a normal operating mode.
Procedure
1. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
b. Press and hold the STOP, SPEED ▼, SPEED ▲and QUICK START keys
simultaneously.
c. The electronic console displays the version number of the PROM mounted on the
upper PCA. Record the PROM version number.
d. Following the version number, a horizontal line sweeps from top to bottom and then a
vertical line sweeps from right to left.
Note:
The lines check the LEDs mounted on the upper PCA. If the lines are broken when they sweep
across the electronic console, replace the upper PCA.
e. After the LED test, the electronic console displays the potentiometer increment
number.
f. Press the INCLINE keys. Verify that the running bed inclines and declines as the
INCLINE keys are pressed.
g. Watch the electronic console. When the potentiometer increment number is displayed
on the electronic console, enter power bit mode by starting the running belt.
Note:
When the running belt is started, the number of power bits will be displayed. Power bits represent

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the amount of power applied to the drive motor. Power bits are the product of selected speed and
applied load.
h. Press the SPEED ▲ and ▼keys. Verify that the power bits number increments and
decrements as the SPEED keys are pressed.
i. Press STOP to return to the Enter Your Weight banner.
j. Turn off the treadmill with the circuit breaker, then unplug the treadmill from the wall
outlet.
Diagram 2.1 - C942 Display

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Procedure 2.2 - C942 Diagnostic Program (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. (see Diagram 2.1).
Placing the C942 Treadmill in diagnostic mode causes the software to perform the following
operations:
a Test the LED’s mounted on the upper PCA;
b Provide the option of calibrating the lift system;
c Display the drive motor power bits;
d Display and test the heart rate function;
e Display the error code log;
f Provide a method of checking the operation of the keys on the electronic console;
g Test the circuit breaker trip function.
Procedure
1. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
b. Press keys RESET,5,1,7,6,5,7,6,1, sequentially.
c. Following the version number, a horizontal line sweeps from top to bottom and then a
vertical line sweeps from right to left.
Note:
The lines check the LEDs mounted on the upper PCA. If the lines are broken when they sweep
across the electronic console, replace the upper PCA.
d. After the LED test, the electronic console displays the potentiometer increment
number.
e. Press the INCLINE keys. Verify that the running bed inclines and declines as the
INCLINE keys are pressed.
f. Watch the electronic console. When the potentiometer increment number is displayed
on the electronic console, enter power bit mode by starting the running belt.

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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.
g. Press the SPEED ▲ and ▼keys. Verify that the power bits number increments and
decrements as the SPEED keys are pressed.
h. Press the STOP key to exit the power bits mode and enter the heart rate mode.
i. If the heart rate option has been installed, you may test the heart rate function using a
chest strap transmitter or test transmitter.
j. Press the ENTER key to enter the error code log. The error code log will display the
last 10 errors that occurred. Error 1 will be the most recent error and error 10 will be
the oldest error. If more than 10 errors occur, the most recent error will be inserted in
position 1 and all other errors will be pushed down one position. The error that was in
the 10th position will be lost. If you wish to clear the error code log, press the QUICK
START and STOP keys, simutaneously.
k. Press the ENTER key to exit the error code log and enter the key pad test.
l. Press each key one at a time the display will confirm the key that was pressed. Press
the INCLINE▼and SPEED ▲ keys, simultaneously to exit the keypad test.
m. The next test is the circuit breaker test. Follow the instructions on the display to cause
either a test trip of the treadmill circuit breaker or exit the diagnostics program.

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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
1. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
b. With the Enter Your Weight banner scrolling, press the STOP key, the SPEED ▼key,
and then the SPEED ▲key sequentially.
c. The console displays the number of miles logged on the treadmill.
d. Turn off the treadmill with the circuit breaker, then unplug the treadmill from the wall
outlet.

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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. (see Diagram 2.1).
This procedure allows you to display the number of miles logged on the treadmill.
Procedure
1. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker
b. Press keys RESET,6,5, sequentially.
c. The software version will be displayed. Press the ENTER key to continue.
d. The console displays the number of miles logged on the treadmill.
e. Turn off the treadmill with the circuit breaker, then unplug the treadmill from the wall
outlet.

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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.
After you have selected a measurement standard, the software compiles and records workout
information in the units of the measurement standard selected. Changing to the alternate
measurement standard after your workout has started will cause invalid data to be displayed. For
this reason, change the measurement standard only after turning ON the treadmill.
Procedure
1. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
b. With the Enter Your Weight banner scrolling, press and hold the SPEED ▲and QUICK
START keys simultaneously until the Press ▲for MPH or ▼for KPH message scrolls
across the screen.
c. Use the SPEED ▲or SPEED ▼key to select the measurement standard.
Note:
When the treadmill is turned off or unplugged it will remember the last measurement standard
selected.