9.31, 9.33, 9.35 Treadmill
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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.
© 2003 Precor Incorporated
Unauthorized Reproduction and Distribution Prohibited By Law
9.31, 9.33, 9.35 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 9.31, 9.33 or 9.35 Treadmill Owner’s Manual, before you perform the
maintenance procedures in this manual.
Section Two, Software Features. Precor treadmills are 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 the 9.31, 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/Dealer”.
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Technical Specifications
Physical Specifications
Length: 79 inches (201 cm.)
Width: 33.5 inches (85 cm.)
Height: 55 inches (140 cm.)
Running surface: 20 inches by 57 inches (51 cm. by 145 cm.)
Motor: 2.75 (9.31, 9.33), 3.0 (9.35) hp. continuous duty
DC
Speed: 0.5 to 11 mph (0.8 to 18 kph)
10 mph is equivalent to a 6 minute mile
Incline: 0% to +15% grade
Power: 120 Vac 50/60 Hz @ 20 amp
Weight: 280 lbs (127 kg.)
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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
• Lift Test
• Belt Speed Test
• Belt Power Test
Procedure
1. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
2. Press keys RESET,5,1,7,6,5,7,6,1, sequentially.
3. If you are testing a 9.33 or 9.35 treadmill continue with step 4. If you are testing a 9.31
treadmill skip to step 31.
4. The keys on the display are hypothetically numbered 1 to 7 from left to right. See Diagram
2.1. The STOP is key number 4 and is located directly below the QUICK START key. The
QUICK START key is not part of the numbering sequence.
5. The display will momentarily read DIAGS - HARDWARE VALIDATION.
6. The display will momentarily read DISPLAY TEST and then illuminate every LED on the
display. Check all LED positions to ensure that all of the LED’s are functioning. Press the
ENTER key to continue.
Diagram 2.1 - 9.33 & 9.35 Displays
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7. The display will momentarily read KEYBOARD TEST.
8. The keyboard test will place two dots on the display for each key on the display, including
the numeric keypad. Pressing a key will cause the upper of the two dots associated with the
key to go out. Test all of the keys in this manner. Tug on the safety key lanyard, to ensure
that the STOP key is activated.
9. Press and hold the ENTER key to proceed to the heart rate test.
10. The display will momentarily read HEART RATE TEST.
11. The heart rate test will display the heart rate being received during this test from either a
chest strap transmitter or test transmitter.
12. Three heart rate values will be displayed. They will be prefixed “U” for unfiltered, “F” for
filtered and “P” for Polar filtering. The Polar filtered heart rate will also appear in the normal
heart rate display, since Polar filtering is the filtering used during normal operation. The right
most red LED in the smart rate display will flash each time a heart beat is detected.
Note: If there is not a heart rate receiver installed or there is a bad or intermittent connection
between the heart rate receiver and the upper PCA, the messages in step 9 will be
replaced by the message NO HEART RATE RECEIVER.
13. Press the ENTER key to proceed to the lift test.
14. The display will momentarily read LIFT TEST.
15. Two numbers will be displayed, the percent of lift and A/D number related to the current lift
position. The A/D (analog to digital) number represents the lift potentiometer reading. The
A/D number will be in the range of 0 to 255.
16. The lift may be operated using the INCLINE keys. The incline percentage and A/D numbers
will change accordingly.
17. The A/D reading will be used later in this service manual to calibrate the lift.
18. Press the ENTER key to proceed to the belt speed test.
19. The display will momentarily read BELT SPEED TEST.
20. The speed of the running belt is controlled by the SPEED keys during this test.
21. The following values are displayed; time (that the running belt has operated during this test),
current (in amps through the drive motor), belt speed (in MPH) and power bits (PWM value).
22. This test is valuable in diagnosing treadmill load conditions such as running bed and/or
running belt condition. As load is increased, the speed is kept at a constant value (as set via
the SPEED keys) and the current and power bits will vary proportionately to the load.
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23. It is suggested that you perform this test on a treadmill known to be in excellent operating
condition. Note the values displayed at a fixed speed (such as 3 MPH) and your body
weight. Those values may then be used to benchmark the operation of treadmills you are
diagnosing.
24. Press press the ENTER key to proceed to the belt power test.
25. The display will momentarily read BELT POWER TEST.
26. The belt power test is similar to the belt speed test except that the SPEED keys control the
power bits (PWM value) instead of the belt speed.
27. The same (see step 16) values will be displayed as in the belt speed test.
28. This test is valuable in diagnosing treadmill response to load conditions. As load is
increased, the power bits are kept at a constant value (as set via the SPEED keys) and the
current and belt speed will vary proportionately to the load.
29. It is suggested that you perform this test on a treadmill known to be in excellent operating
condition. Note the values displayed at a fixed power bit reading (as set by the SPEED
keys) and your body weight. Those values may then be used to benchmark the operation of
treadmills you are diagnosing.
30. The belt power test is the last test in the diagnostics routine. Press the RESET or the
ENTER key to exit the diagnostics routine.
Diagram 2.2 - 9.31 Display
31. The keys on the display are hypothetically numbered 1 to 7 from left to right. See Diagram
2.2. QUICK START is key number 4.
32. The display will momentarily read DISPLAY TEST.
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33. All of the LED’s on the display will illuminate. If any LED on the display is not illuminated,
replace the upper PCA.
34. Press the SELECT or the RESET key to continue to the keyboard test.
35. The display will momentarily read KEYBOARD TEST.
36. An indicator will be displayed for each key on the keyboard. When a key is pressed the
indicator will change. Press every key on the keyboard to ensure that all keys are
functioning normally.
37. Press and hold the RESET or SELECT key to continue to the heart rate test.
38. If the 9.31 is not equipped with the heart rate option, the message NO HR RECEIVER will
be displayed indicating that a heart rate receiver was not detected.
39. Create a heart rate signal using either a heart rate chest strap or test transmitter. The heart
rate LED will flash and the heart rate reading will be displayed. The SELECT key will allow
you to toggle between P - Polar filtering, U - unfiltered and F - filtered.
40. Press the RESET key to continue to the lift test.
41. The display will momentarily read LIFT TEST then A/D.
42. The lift A/D (analog to digital) number will be displayed. The lift A/D number is related to the
current lift position and represents the lift potentiometer reading. The A/D number will be in
the range of 0 to 255.
43. The lift may be operated using the INCLINE keys. The lift A/D number will change
accordingly.
44. The A/D reading will be used later in this service manual to calibrate the lift.
45. Press the RESET key to proceed to the belt speed test. Press SELECT to display the
percent of incline.
46. The display will momentarily read BELT SPEED TEST then MPH. The display then show
the actual operating speed.
47. The speed of the running belt is controlled by the SPEED keys during this test as it would be
in a normal operating mode.
48. The SELECT key will toggle between a MPH, POWERBITS and TIME display. TIME
indicates the test’s elapsed time.
49. This test is valuable in diagnosing treadmill load conditions such as running bed and/or
running belt condition. As load is increased, the speed is kept at a constant value (as set via
the SPEED keys) and the current and power bits will vary proportionately to the load.
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50. It is suggested that you perform this test on a treadmill known to be in excellent operating
condition. Note the values displayed at a fixed speed (such as 3 MPH) and your body
weight. Those values may then be used to benchmark the operation of treadmills you are
diagnosing.
51. Press press the RESET key to proceed to the belt power test.
52. The display will momentarily read BELT POWER TEST then POWERBITS. The display will
then read the current powerbit value.
53. In this test SPEED keys control the power bit setting instate of the actual speed.
54. The SELECT key will toggle between a MPH, POWERBITS and TIME display. TIME
indicates the test’s elapsed time.This test is valuable in diagnosing treadmill response to
load conditions. As load is increased, the power bits are kept at a constant value (as set via
the SPEED keys) and the current and belt speed will vary proportionately to the load.
55. It is suggested that you perform this test on a treadmill known to be in excellent operating
condition. Note the values displayed at a fixed power bit reading (as set by the SPEED
keys) and your body weight. Those values may then be used to benchmark the operation of
treadmills you are diagnosing.
56. The belt power test is the last test in the diagnostics routine. Press the RESET key to exit
the diagnostics routine.
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Procedure 2.2 - Accessing the Information Display Program
The information display will access the following data;
• Odometer
• Hour meter
• Software version
• Error log
Procedure
1. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
2. Press the keys RESET,6,5, sequentially.
3. If you are testing a 9.33 or 9.35 treadmill continue with step 4. If you are testing a 9.31
treadmill skip to step 19.
4. The display will momentarily read, DIAGS - INFORMATION DISPLAY.
5. The display will momentarily read, ODOMETER.
6. The treadmill’s odometer will be displayed as 1234567 MPH or 1234567 KPH.
Note: The odometer data is stored in non-volatile memory on the upper PCA. If the upper PCA
is replaced the odometer data will be lost.
7. Press the ENTER key to proceed to the hour meter display.'
8. The display will momentarily read, HOUR METER.
9. The operating time of the unit will be displayed as 12345 HOURS. The operating time is
defined as total amount of time that the unit has operated in program modes with the drive
motor running. The hour meter is also used to provide the “time stamp” for the error code
log.
10. Press the ENTER key to proceed to the software version display.
11. The display will momentarily read, SOFTWARE VERSION.
12. The software versions of the upper and lower PCA’s will be displayed as;
UPPER 1.01 LOWER 1.01.
13. Press the ENTER key to proceed to the error log.
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14. The error log will store up to 10 error conditions. The errors are logged with the most recent
error in position one. When a new error condition occurs, each existing error is pushed down
one position in log. If there was an error in position 10 when a new error was logged, the
error that was in position 10 will be lost.
15. Each error in the log will show the odometer reading (in miles) and the time (hour meter)
when the error occurred. The errors are displayed as;
1 ER20 1234567 MI 12345 HRS.
16. The arrows keys will allow you to scroll through the log. When the first unused position is
reached in the log, the message NO MORE ERRORS will be displayed.
17. When the QUICK START key is held for 2 seconds the message HOLD TO CLEAR
ERRORS will be displayed. If the QUICK START key is held for an additional 2 seconds, the
message CLEARED will be displayed. When the QUICK START key is released the
message NO MORE ERRORS will be displayed and all error are erased from the log.
18. Press the RESET the ENTER key to exit the information display.
19. The display will scroll either MILES: 1234567 or KILOMETERS 1234567. The reading will
indicate the total distance that has been recorded on the treadmill.
20. Press the SELECT or RESET key to continue to the hours display.
21. The display will read HOURS: 1234. The reading will indicate the total number of hours of
use.
22. Press the SELECT or RESET key to continue to the software version display.
23. The display will continuously toggle between UPPER SW VER X.XX. and LOWER SW VER
X.XX.
24. Press the SELECT or RESET key to continue to the error log display.
25. The first error log entry will scroll 1:ERR XX at 123456 MILES 12435 HOURS. If there are
no errors in the log, the message NO ERRORS will be scrolled.
26. The
▲ key will move through the log to older errors (if any). If there are no more errors, the
message NO MORE ERRORS will be scrolled.
27. Pressing and holding the QUICK START key for 2 seconds will cause the prompt CLEAR?
to be displayed, holding the QUICK START for an additional 2 seconds will clear all existing
entries from the error log. The display will confirm that the error log has been cleared by
displaying OK. The display will revert to the first log entry and show it as a null entry ( 1: ---).
If the QUICK START key is not held for a minimum of 4 seconds, the error log will not be
cleared.
28. Press the RESET or SELECT key to exit the information display program.
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Procedure 2.3 - Accessing the User Parameter Program
This procedure allows you to change the following settings:
• Set Measurement Units
• Enable/Disable Password
• Set User Name
Procedure
1. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
2. Press keys RESET,5,6,7,1 sequentially.
3. If you are testing a 9.33 or 9.35 treadmill continue with step 4. If you are testing a 9.31
treadmill skip to step 17.
4. The display will momentarily read, DIAGS - SET USER PARAMETERS.
5. The display will momentarily read SELECT UNITS
6. The currently selected measurement unit will then be displayed.
7. Use the
, keys to scroll through the available measurement units.
8. Press the ENTER key to select the currently displayed measurement unit.
9. The display will momentarily read, PASSWORD
10. Use the
, keys to select either PASSWORD ENABLED or PASSWORD DISABLED.
11. Press the ENTER key to exit diagnostics (9.33 only) or to continue to set user name (9.35
only).
12. The display will momentarily read, USER NAME.
13. Up to four user names may be entered. If user names have not been p reviously entered the
default user names will be USER1, USER2, USER3 and USER4.
14. The USER1 name will be displayed first. The ENTER key will select USER2, then USER3,
then USER4.
15. With the user name to be edited displayed, use the INCLINE
, INCLINE , to select the
character position to be edited. Use the SPEED
, SPEED keys to select the letter to be
placed in the selected character position. The user name can be a maximum of five
characters.
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16. Press the ENTER key to select the next user name or to exit the program.
17. The display will read SELECT UNITS: and scroll either US STANDARD or METRIC.
18. Use the
, keys to select the desired measurement units.
19. Press the RESET or SELECT key to continue with password section.
20. The display will scroll PASSWORD: ENABLED or PASSWORD: DISABLED. Use the
,
keys to select the desired setting.
21. Press the RESET key to exit the user parameter program.
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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
• Software version number
• Program number running when the problem occurred
• A description of:
a. What happened or failed to happen.
b. The action taken by the user just before the problem occurred.
c. Problem-related information (such as how far into the program the problem occurred,
the work level being used when the problem occurred, etc.).
• The frequency of occurrence.
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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.
Procedure
4. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
5. Place the treadmill in Manual Mode. Adjust the speed of the running belt to 2–3 m.p.h.
Operate the treadmill for at least 5 minutes.
a. Concentrate on the feel of the running belt and the sound of the drive motor and rollers.
Be on the alert for unusual noises, smells, or vibrations.
b. Log the power bits under loaded and unloaded conditions.
c. Observe the LED’s on the electronic console. Make sure that each LED lights as the in-
formation corresponding to that LED is displayed on the electronic console.
3. If during step 1c, squeaking noises associated with the running deck were heard, check the
lubrication of the running deck studs. If necessary, apply silicon grease to all of the running
deck studs.
3. Press the STOP key. When the treadmill comes to a stop, view the electronic console as the
treadmill scans time, speed, distance and percent of lift.
4. Press the INCLINE ▲ key while viewing the electronic console. Confirm that the running
bed inclines and the incline display increments to 15% as the INCLINE ▲ key is pressed.
5. 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% as the INCLINE ▼ key is
pressed.
6. Turn off the treadmill with the circuit breaker, then unplug the treadmill from the wall outlet.
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Procedure 4.1 - Calibrating the Lift Motor
1. Set the treadmill circuit breaker in the “off” position and unplug the line cord from the wall
outlet.
2. Remove the hood.
3. Place the treadmill on it’s right side. Remove hitch and clevis pins that secure the lift tube to
the lift platform.
Diagram 4.1 - Lift Motor Mounting
1”
Lift Tube
Drive Screw
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