Precor 9.23 User manual

9.23, 9.27 Treadmill
20081-118 Page 1
9.23, 9.27 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.
© 2007 Precor Incorporated
Unauthorized Reproduction and Distribution Prohibited By Law

9.23, 9.27 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 9.23, 9.27 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 9.23, 9.27 Treadmill.
General Information
For the latest exploded view diagram, part number and part pricing information, visit the Precor
dealer website at “www.precor.com/connection”.

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20081-118 Page 3
Technical Specifications
Length: 76.5 inches (194.3 cm.)
Width: 30.5 inches (77.5 cm.)
Height: 55 inches (140 cm.)
Running surface: 20 inches by 59 inches (51 cm. by 149.9 cm.)
Motor: 2.75 hp. continuous duty DC
Speed: 0.5 to 12 mph or 0.8 to 20 kph)
10 mph is equivalent to a 6 minute mile
Incline: 0% to +15% grade
Power: 120 Vac 50/60 Hz @ 15 amp

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Procedure 2.1 - Error Codes and Lower PCA Indicators
Error Codes:
03 - EEPROM Error: EEPROM checksum test error, when this error is consistently displayed,
the upper PCA is usually the cause. If displayed intermittently, the cause is typically
external, A.C. power spikes, for example.
26 - Speed Error: This error indicates that the speed control circuit is not receiving correct motor
speed pulses. This could be the result of incorrect speed, speed sensor failure, or drive
motor failure.
40 - Lift Error: This error indicates that the lift control system is not receiving correct analog
position information from the lift motor. This could be the result of lift motor connection
failure, lift motor potentiometer failure, lift motor failure or lower PCA failure.
Lower PCA Indicators: The lower PCA is furnished with seven LED indicators. Their names and
functions are listed below.
Power - The POWER LED should illuminate when the treadmill is powered “on”. The POWER
LED is in the 12 Vdc power supply and indicates the input to the power supply is
receiving voltage.
UP - The UP LED should illuminate when the incline is operating in the upward direction. The UP
LED indicates that operating voltage has been applied to the incline up relay.
DOWN - The DOWN LED should illuminate when the incline is operating in the downward
direction. The DOWN LED indicates that operating voltage has been applied to the
incline down relay.
PWM - The PWM LED should illuminate whenever the drive motor is in motion. The PWM LED
indicates that the PWM drive signal is being applied to the drive motor power controller
circuit.
LIMIT - The LIMIT LED indicator will illuminate when too much current is being demanded from
the drive motor power controller circuit. If the drive motor’s instantaneous current
exceeds 28 amps, the current limit circuit is activated. When current limit is activated the
drive motor current and speed can not be increased.
MOT DRV - Indicates a defective drive motor circuit. Typically caused by a component failure on
the lower PCA.
SHUTDOWN - If the drive motor current exceeds 28 amps for 3-5 seconds, the motor drive
signal is removed and the motor drive circuit is shutdown.

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Procedure 2.2 - Accessing the Odometer and Hour Meter
1. Set the on/off switch in the “on” position and remove the safety key from the console. Allow
the internal power supply to discharge, approximately 10 seconds, and then replace the
safety key on the console. Within 2 seconds of replacing the safety key, press the STOP,
INCLINE , SPEED keys, sequentially.
2. The odometer in miles or kilometers will be displayed in the DISTANCE window of the
display. See Diagram 2.1, below.
3. The hour meter will be displayed in the TIME window. See Diagram 2.1, below.
4. The upper PCA software version will be displayed in the main window.
5. Press the STOP key to exit this program.
Diagram 2.1 - 9.27 Display
Distance
Window
Time
Window
Speed Keys
Incline Keys
Quick Start
Key
Enter Key
Stop Key

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Procedure 2.3 - Accessing the Service Mode Program
Calibration - Incline calibration and treadmill calibration
Console Sel - Sets the console for 9.23 or 9.27 operation
Display Test - Tests the display
Key Test - Tests the keypad
1. Set the on/off switch in the “on” position and remove the safety key from the console. Allow
the internal power supply to discharge, approximately 10 seconds.
2. While pressing the QUICK START and SPEED keys, simultaneously, replace the safety
key on the console. Continue to press the QUICK START and SPEED keys until the
display scrolls “SERVICE MODE”. The main screen will display the upper software version
number.
3. Press the ENTER key, the display will read CALIBRATION. Use the , to scroll between
the four test modes, Calibration, Key Test, Display Test and Console Sel. Press the
ENTER key to select the appropriate test. You may press and hold the STOP key at any
time to exit the SERVICE MODE program.
Calibration
4. Inc Limit will be displayed at the bottom of the display and the incline A/D number will be
displayed in the HEART RATE window. As the incline is raised or lowered the A/D number
should track the incline’s movement.
5. The A/D number will be used to calibrate the incline, Procedure 4.1. Warning, Do not
change the A/D number at this point, if the incline requires calibration, go to Procedure 4.1.
6. Press the ENTER key to enter the treadmill calibration mode.
Warning
During this procedure the running belt will be accelerated to the treadmill’s maximum
(12.0 mph) speed. Do not stand on the treadmill’s running belt during this procedure.
7. This procedure must be performed after the upper PCA, the upper PCA software or the
lower PCA has been replaced and before the treadmill is placed into normal operation.
8. When the running belt stops the display show the test results Pass or FAIL and will then
return to the normal user mode and the calibration process is complete.
Key Test
9. One at a time press all of the keys on the console, the key name should be displayed at the
bottom of the display. Pressing the STOP key a second time will exit the key test.

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Display Test
10. The display test will light every segment in the display. You must watch the display
throughout the test to ensure that every display segment is functioning. This test will run
continuously until you press the STOP key to halt the display test.
Console Sel
11. The display will indicate whether the console is set as a 9.23 or 9.27 treadmill/ The will
toggle the setting. Press the ENTER key to save the setting that agrees with the treadmill’s
model number.

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Procedure 2.4 - U.S. Standard/Metric Selection
1. Set the on/off switch in the “on” position and remove the safety key from the console. Allow
the internal power supply to discharge, approximately 10 seconds, and then replace the
safety key on the console. Within 2 seconds of replacing the safety key, press the STOP,
INCLINE , SPEED keys, sequentially.
2. Press the ENTER key to toggle the selection between U.S. Standard and METRIC.
3. Press the ENTER key to save the selection.

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Procedure 2.5 - 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. Provide the model number as accessed in Procedure 2.2.
• 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
1. Plug the power cord into the AC outlet. Set the safety switch in on its operating position on
the console, refer to Diagram 2.1. Set the on/off switch in the “on” position, the on/off switch
should illuminate. All of the LED’s on the display should illuminate for a couple of seconds
and the scroll the message PRESS QUICKSTART OR PROGRAM. The POWER LED
should illuminate on the lower PCA.
2. Place the treadmill in Manual Mode. Adjust the speed of the running belt to 2–3 m.p.h.
Remove the safety switch from the console. The display should go blank and the treadmill
belt stop. Replace the safety switch on the console, all of the LED’s on the display should
illuminate for a couple of seconds and the scroll the message PRESS QUICKSTART OR
PROGRAM.
3. 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 AC input current 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.
4. Press the STOP key. When the treadmill comes to a stop, view the electronic console as the
treadmill the message PAUSED - PRESS QUICK START TO CONTINUE scrolls on the
display. Adjust the speed of the running belt to 2–3 m.p.h.
5. 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.
6. 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.
7. Set the on/off switch in the “off” position, then unplug the treadmill from the AC outlet.