9.55 Treadmill
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9.55 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
9.55 Treadmill
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Section One - Things you Should Know
About This Appendix
The 9.55 has been manufactured in two versions. When servicing a 9.55 it is critical that you are
aware of which version of version you are servicing. The differences in the versions may greatly
impact service requirements and procedures. For convenience, the versions detailed below will
be referred to as version 1 or version 2 in the reminder of this service manual. Any procedures
that do not reference a specific version is applicable to all versions of the 9.55.
Version 1 was manufactured between March 2000 and July 1, 2001.
Version 2 was manufactured between July 2, 2001 and the present.
Section One, Things You Should Know. This section includes technical specifications. Read
this section, as well as the 9.55 Treadmill Owner’s Manual, before you perform the maintenance
procedures in this manual.
Section Two, Software Features. Precor’s 9.55 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 the 9.55 Treadmill.
9.55 Treadmill
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General Information
For the latest exploded view diagram, part number and part pricing information, visit the Precor
dealer website at “www.precor.com/Dealer”.
Technical Specifications
Physical Specifications
Length: 84 inches (213 cm.)
Width: Handrails 36.75 inches (93 cm.)
Base 33.75 inches (86 cm.)
Height: 55 inches (140 cm.)
Running surface: 26 inches by 60 inches (51 cm. by 152 cm.)
Motor: 2 hp. continuous duty DC
Speed: 0.5 to 12 mph (0.8 to 19 kph)
10 mph is equivalent to a 6 minute mile
Incline: 0% to +12% grade
Power: 120 Vac 50/60 Hz @ 20 amp
240 Vac 50/60 Hz @ 20 amp
Weight: 350 lbs (158 kg.)
Shipping Weight: 460 lbs (207 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
• Circuit Breaker Test
Procedure
1. 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.
2. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
3. Press keys RESET,5,1,7,6,5,7,6,1, sequentially.
4. The display will momentarily read DIAGS - HARDWARE VALIDATION.
5. 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 - 9.55 Treadmill Display
Key #7
Key #4
Reset/Key #1
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6. The display will momentarily read KEYBOARD TEST.
7. 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.
8. Press and hold the ENTER key to proceed to the heart rate test.
9. The display will momentarily read HEART RATE TEST.
10. The heart rate test will display the heart rate being received during this test from either a
chest strap transmitter or test transmitter.
11. 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.
12. Press the ENTER key to proceed to the lift test.
13. The display will momentarily read LIFT TEST.
14. 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.
15. The lift may be operated using the INCLINE keys. The incline percentage and A/D numbers
will change accordingly. Care must be taken while operating the lift in this mode because
the normal upper and lower range limits are not in effect. It is possible to operate the lift to
it’s physical limits and may cause the lift motor to jam.
16. The A/D reading will be used later in this service manual to calibrate the lift.
17. Press the ENTER key to proceed to the belt speed test.
18. The display will momentarily read BELT SPEED TEST.
19. The speed of the running belt is controlled by the SPEED keys during this test.
20. 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).
21. 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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22. 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.
23. Press press the ENTER key to proceed to the belt power test.
24. The display will momentarily read BELT POWER TEST.
25. 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.
26. The same (see step 16) values will be displayed as in the belt speed test.
27. 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.
28. 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.
29. Press the ENTER key to proceed to the circuit breaker test.
30. The display will momentarily read CIRCUIT BREAKER TEST.
31. The message HOLD ARROW KEY TO TRIP will be displayed. When the arrow key is held,
the message BREAKER WILL TRIP 3 2 1 0 will flash on the screen one word at a time.
Shortly after the 0 is displayed, the circuit breaker will trip. If the arrow key is released before
the circuit breaker trips, the test will be terminated.
32. The circuit breaker test is the last test in the diagnostics routine. If you do not wish to ca use
the circuit breaker to trip, press the RESET or the ENTER 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. The display will momentarily read, DIAGS - INFORMATION DISPLAY.
4. The display will momentarily read, ODOMETER.
5. 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.
6. Press the ENTER key to proceed to the hour meter display.'
7. The display will momentarily read, HOUR METER.
8. 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.
9. Press the ENTER key to proceed to the software version display.
10. The display will momentarily read, SOFTWARE VERSION.
11. The software versions of the upper and lower PCA’s will be displayed as;
UPPER 1.01 LOWER 1.01.
12. Press the ENTER key to proceed to the error log.
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13. 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.
14. 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.
15. 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.
16. 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.
17. Press the RESET the ENTER key to exit the information display.
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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. The display will momentarily read, DIAGS - SET USER PARAMETERS.
4. The display will momentarily read SELECT UNITS
5. The currently selected measurement unit will then be displayed.
6. Use the
▲,▼ keys to scroll through the available measurement units.
7. Press the ENTER key to select the currently displayed measurement unit.
8. The display will momentarily read, PASSWORD
9. Use the
▲,▼ keys to select either PASSWORD ENABLED or PASSWORD DISABLED.
10. Press the ENTER key to continue.
11. The display will momentarily read, USER NAME.
12. 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.
13. The USER1 name will be displayed first. The ENTER key will select USER2, then USER3,
then USER4.
14. 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.
15. Press the ENTER key to select the next user name or to exit the 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 12% 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 t o
the lift platform. See Diagram 4.1.
Diagram 4.1 - Lift Motor Mounting
Hitch Pin
5/8”
Hitch Pin
Clevis Pin
Lift Tube
Drive Screw
Clevis Pin
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4. Plug the power cord into the wall outlet, set the treadmill circuit breaker in the “on” position.
5. Press keys RESET, 5,1,7,6,5,7,6,1, sequentially to enter the diagnostics routine. Refer to
Procedure 2.1 and advance to the lift test. When the lift calibration number is displayed on
the console, use the INCLINE
▲ or INCLINE ▼ key to set the lift calibration number to 20.
CAUTION
While running the lift motor in the diagnostics mode it is possible to operate the lift motor beyon d
it’s normal range of motion. When you perform the next step, care must be taken not to jam the
lift tube against the motor frame.
6. Press the RESET key to exit the diagnostics mode.
7. Set the treadmill circuit breaker in the “off” position, unplug the line cord from the wall outlet.
8. Rotate the lift tube clockwise, by hand, as far as possible. Then rotate the lift tube counterclockwise until the distance from the top of the lift tube to the lift motor is 5/8 inch. See
Diagram 4.1. While rotating the lift tube, be sure the lift motor drive screw does not rotate. If
the drive screw is rotated, return to step 4 and repeat steps 4 through 7.
9. Replace the clevis and hitch pins removed in step 3. Return the treadmill to an upright
position.
10. Plug the line cord into the wall outlet, set the treadmill circuit breaker in the “on” position.
11. check the calibration of the lift system by performing the following steps:
a Press the INCLINE
▲ key until the console displays 12% incline.
b Press the INCLINE
▼ key to return to 0% incline.
12. Re-install the hood.
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Procedure 4.2 - Adjusting Drive Belt Tension
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 drive belt tension gauge on the drive belt as shown in Diagram 4.2.
Diagram 4.2 - Drive Belt Tension Gauge
4. The gauge should read approximately 80 inch/pounds. The drive belt tension is acceptable
if it is in the range of 70 to 90 inch-pounds.
5. If the drive belt tension is less than 70 or greater than 90 inch/pounds, adjust the drive belt
adjustment bolt until the belt gauge reads approximately 80 inch/pounds. See Diagram 4.3.
Momentarily remove the drive belt tension gauge from the drive belt. Replace the drive belt
tension gauge on the drive belt and re-adjust the drive belt tension, if necessary.
6. Re-install the hood.
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Diagram 4.3 - Drive Belt Adjustment Bolt
7. Plug the line cord into the wall outlet and set the treadmill circuit breake r in the “on ” positio n.
8. Check treadmill operation per Section 3.
Drive
Motor
Drive Belt
Adj. Bolt
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