Precor EFX5.31 User manual

5.31, 5.33, 5.35, 5.37 Elliptical Fitness Crosstrainer
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
20039-155

Section One - Things You Should Know
Right, Left, Front, and Back Conventions
In this manual, right, left, front, and back are from the perspective of a user standing on the
EFX5.31, 5.33, 5.35, 5.37 facing the display enclosure.
Warning and Caution Statements and General Safety Guidelines
Warning statements indicate a particularly dangerous activity. Warning statements you will find in
this manual include:
• To remove power from the EFX, the power cord must be disconnected from the wall outlet.
Always ensure that the EFX is unplugged from the wall outlet when you inspect or adjust the
EFX, or when you isolate, remove, or replace a 5.31, 5.33, 5.35, 5.37 EFX component.
• Removing the covers exposes high voltage components and potentially dangerous
machinery. Exercise extreme caution when you perform maintenance procedures with the
hood removed.
• During service operations you will be very close to moving machinery and high voltage
components. When you perform maintenance procedures with the covers removed, remove
jewelry (especially from ears and neck), tie up long hair, remove neck ties, and do not wear
loose clothing.
• Exercise caution when touching any wire or electrical component during EFX operation.
Caution statements are intended to prevent damage to the EFX as a result of the current activity.
Caution statements included in this manual are listed below:
• Notice the orientation notch on the lower PCA PROM. These components must be
positioned with the same notch orientation.
Safety guidelines you should know and follow include:
• Read the owner’s manual and follow all operating instructions.
• Visually check the EFX before beginning service or maintenance operations. If it is not
completely assembled or is damaged in any way, exercise extreme caution while operating
and checking the EFX.
• When operating the EFX, do not wear loose clothing. Do not wear shoes with heels or
leather soles. Check the soles of your shoes and remove any embedded stones. Tie long
hair back.
• Do not rock the unit. Do not stand or climb on the handlebars, display enclosure, or cover.
• Do not set anything on the handlebars, display enclosure, or cover. Never place liquids on
any part of the EFX other than a water bottle in the water bottle holder during normal

operation.
• To prevent electrical shock, keep all electrical components, such as the power cord and on/
off switch away from water and other liquids.
• Do not use accessory attachments that are not recommended by the manufacturer-such
attachments might cause injuries.
General Information
For the latest exploded view, part number and part pricing information, visit the Precor dealer
website at “www.precor.com/connection.

Required Tools and Equipment
The following list is a summary of the tools and equipment required when you service Precor’s
EFX.
TOOLS EQUIPMENT
phillips and flat-head screwdrivers digital multimeter
standard and metric allen wrench sets
open-end wrench set Supplies
blue loctite
drive ratchet and ratchet set
socket drive allen set cable ties
chip puller Spares
rubber mallet data cables
snap ring pliers
100 ft./lb. torque wrench
300 in./lb. torque wrench
belt gauge (part # 20030-117)

Procedure 2.1 - Accessing the Hardware Validation Program
The EFX diagnostic software cycles through the following tests:
Hardware Validation
Display Test
Keyboard Test
Heart Rate Test
Machine Test
Brake
PWRB
Crossramp Test
LIFT A/D
Auto leveling
Procedure
1. Plug the power cord into the wall outlet, then turn on the EFX with the on/off switch.
Note:
Use the RESET key and the ten key keypad to enter the access code.
2. With the PRECOR EFX banner displayed, access the diagnostic program by pressing, keys
RESET,5,1,7,6,5,7,6,1, sequentially.
Diagram 2.1 - 5.37 Display

3. The test name HARDWARE VALIDATION will be displayed. Press the OK key to proceed
to the display test.
4. The test name “DISPLAY” will be displayed. Press the OK to enter the display test or an S,
Tkey to proceed to a different test.
5. Each time you press the OK key a different block of LED’s will illuminate. Check each LED
in each block to ensure that all are functioning.
6. Press and hold the ENTER key for several seconds to proceed to the keyboard test.
7. The test name “KEYBOARD” will be displayed. Press the OK to enter the keyboard test or
an S, Tkey to proceed to a different test.
8. A graphical representation of all the keys on the keyboard will be displayed. When a key is
pressed the representation of the key on the display will be turned “off”. Check all of the
keys on the keyboard in this manner.
9. Press and hold the ENTER key for several seconds to proceed to the heart rate test.
10. The test name “HEART RATE” will be displayed. Press the OK to enter the heart rate test
or an S, Tkey to proceed to a different test.
11. Both the hand held heart rate and wireless heart rate function must be tested. A chest strap
heart rate transmitter or a heart rate test transmitter must be used to test the wireless heart
rate function.
12. When a heart rate signal is received, the unfiltered and filtered heart rates will be displayed.
In addition the Polar heart rate will be displayed in the “Heart Rate” window. The red heart
and the smart rate LED’s will illuminate.
13. Press the ENTER key to proceed to the machine test.
14. The test name “MACHINE” will be displayed. Press the OK to enter the brake test or an
S, Tkey to proceed to a different test.
15. The test name BRAKE will be displayed, press the OK key.
16. PWRB (powerbits) will be displayed. The resistance level will be displayed on the left side of
the display and the corresponding power bits (duty cycle) will be displayed on the right side
of the display. Initially, the power bits level will be zero, pressing the resistance S, Tkeys
will change the number of power bits being applied to the eddy current system., ranging
from 0 to 68 powerbits.
17. Press the OK key to proceed to the Lift A/D test.
18. The test name “LIFT A/D” will be displayed, press the OK key to enter the Lift A/D test.
19. Please note, on EFX’s equipped with version 4.00 upper software, the EFX must be pedaled
to allow the incline to activate.

20. The incline percentage will be displayed on the left and the A/D (lift calibration) number will
be displayed on the right. The lift A/D number indicates the physical position of the incline
and is used to calibrate the incline. The A/D number will range from 34 (level 1) to 223
(level 20).
21. Press the OK key to proceed to the auto-level test.
22. The test name “AUTO-LEVEL” will be displayed, press the OK key to enter the Lift A/D test.
23. Please note, on EFX’s equipped with version 4.00 upper software, the EFX must be pedaled
to allow the incline to activate
24. If the incline is not at the auto-level position it will move to the auto-level position.
25. When the incline reaches the auto-level position, the display will return to the machine test,
step 13. you may then proceed to another test using the S, Tkeys
26. You may press the RESET key at anytime in the hardware validation program to exit the
hardware validation program.

Procedure 2.2 - Accessing the Diagnostics Test
Procedure
1. Plug the power cord into the wall outlet, then turn on the EFX with the on/off switch.
2. With the PRECOR EFX banner displayed, press keys RESET,6,5, sequentially.
Diagnostics Test
Odometer
Hour meter
U-Boot Software version
U-Base Software version
Lower software version
Usage Log
Error log
4. The test name DIAGNOSTICS TEST will be displayed. Press the OK key to proceed to
odometer. Use the S, Tkeys to proceed to the desired display.
4. The display name “ODOMETER” will be displayed, press the OK key, the odometer value
will be displayed, as total strides accumulated.
5. Press the ENTER key to proceed to the hour meter display.
6. The display name “HOUR METER” will be displayed, press the OK key, the hour meter will
be displayed, as the total number of hours of use. Fractional parts of an hour are stored
internally, the display will be truncated to the nearest full hour.
7. Press the ENTER key to proceed to the U-Boot software version display.
8. The display name “U-BOOT SW” will be displayed, press the OK key, the U-Boot software
part number will be displayed.
9. Press the ENTER key to proceed to the U-Base software version display.
10. The display name “U-BASE SW” will be displayed, press the OK key, the U-Base software
part number will be displayed.
11. Press the ENTER key to proceed to the lower software version display.
12. The display name “LOWER SW” will be displayed, press the OK key, the lower software
part number will be displayed.
13. Press the ENTER key to proceed to the usage log.
14. The display name “USAGE LOG” will be displayed, press the OK key.
15. The program used and the time the program was used will be displayed.

16. The keys S, Twill scroll you through the list of programs that have been used.
17. Press the ENTER key to proceed to the error log display
18. The display name “ERROR LOG” will be displayed press the OK key.
19. The first error log entry will be displayed (1: ERXX @ XX STRIDES XX HRS) .
20. Pressing the S, Tkeys will move you through the log entries. Entry 1 will be the most recent
error log entry, with each succeeding entry being older than the preceding entry.
21. If the error log is empty NO ERRORS will be displayed.
22. 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.
23. Press the RESET key to exit the diagnostics display program.
24. Note: the error log can also be entered at any time by pressing and holding the RESET key
for four seconds.

Procedure 2.3 - Accessing the Set User Parameters Display
Selecting United States standard units causes information to be displayed in miles. Information is
displayed in kilometers if metric units are selected. After you select a measurement standard, the
software accumulates and records workout information in the units of the measurement standard
selected.
Procedure
1. Plug the power cord into the wall outlet, then turn on the EFX with the on/off switch.
2. With the PRECOR EFX banner displayed, press keys RESET,5,6,7,1, sequentially. On the
5.37 press the OPTIONS key.
Diagnostics Test
Select Units
Set Max Pause Time
Set Cool Down
Set Crossramp Auto-Level
3. The display name “SELECT UNITS” will be displayed, press the OK key to proceed to the
select units display or an S, Tkey to proceed to a different display.
4. One of two measurement standards will be displayed, U. S. Standard or Metric.
5. If U. S. Standard is selected, weights will be in pounds and distances will be in miles. If
Metric is selected, weights will be in kilograms and distances in kilometers.
6. Pressing any S, Tkey will toggle the units of measure between US Standard and Metric.
7. Press the ENTER key to save the currently displayed selection and exit the select units
display.
8. The display name “SET MAX PAUSE TIME” will be displayed, press the OK key to proceed
to the set max pause time display or an S, Tkey to proceed to a different display.
9. The current pause time will be displayed. Pressing any S, Tkey will increase or decrease
the maximum pause time between 0 and 10 minutes.
10. Press the ENTER key to save the currently displayed selection and exit the set max pause
time display.
11. The display name “SET COOL DOWN TIME” will be displayed, press the OK key to
proceed to the set cool down time display or an S, Tkey to proceed to a different display.
12. The current cool down time will be displayed. Pressing any S, Tkey will increase or
decrease the cool down time between 0 and 5 minutes.