Cybex LCX-425T Treadmill
Service Manual
Cardiovascular Systems
Part Number LT-19638 Rev C
www.cybexinternational.com
Cybex LCX-425T Treadmill
Service Manual
Cardiovascular Systems
Part Number LT-19638 Rev C
Cybex® and the Cybex logo are registered trademarks of Cybex International, Inc. Polar® is a registered trademark of
Polar Electro Inc.
DISCLAIMER: Cybex International, Inc. makes no representations or warranties regarding the contents of this manual. We reserve
the right to revise this document at any time or to make changes to the product described within it without notice or obligation to
notify any person of such revisions or changes.
© 2007, Cybex International, Inc. All rights reserved. Printed in United States of America.
10 Trotter Drive Medway, MA 02053 • 888-462-9239 • 508-533-4300 • FAX 508-533-5183
www.cybexinternational.com • techhelp@cybexintl.com • techpubs@cybexintl.com • LT-19638 • Rev C • September 2007
Cybex 425T Treadmill Service Manual
About This Manual
An Owner’s Manual is shipped with each unit. To purchase additional copies of this manual or
any other Cybex manual, please do one of the following:
• order online at www.cybexinternational.com
• fax your order to 508-533-5183
• contact Cybex Customer Service at 888-462-9239
• or contact Cybex Customer Service at 508-533-4300
NOTE: Refer to www.cybexinternational.com for changes and updates to this manual.
To contact Cybex with comments about this manual you may send email to techpubs@
cybexintl.com.
FCC Compliance Information
! WARNING: Changes or modifications to this unit not expressly approved by the party
responsible for compliance could void the user’s authority to operate
the equipment.
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment generates,
uses and can radiate radio frequency energy and, if not installed and used in accordance with
the instructions, may cause harmful interference to radio communications. However, there
is no guarantee that interference will not occur in a particular installation. If this equipment
does cause harmful interference to radio or television reception (which can be determined by
turning the equipment off and on) the user is encouraged to try to correct the interference by
one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio TV technician for help.
Page i
Cybex 425T Treadmill Service Manual
DECLARATION OF CONFORMITY August 24, 2006
This Declaration of Conformity is suitable to the European Standard EN 45014, “General criteria for
supplier’s declaration of conformity.”
We,
Manufacturer: Cybex International, Inc. EU Representative: Cybex International UK
10 Trotter Drive Oaktree House
Medway, MA 02053 Atherstone Road
USA Measham
(508) 533-4300 Swadlincote, Derbyshire DE12 7EL
United Kingdom
+44 (0)845 60 60 228
declare under our sole responsibility that the product(s):
Cybex 425T Treadmill
to which this declaration relates is in conformity with the EEC directives listed herein below
(including any and all relevant modifications):
73/23/EEC Low Voltage Directive
89/336/EEC Electromagnetic Compatibility
2002/95/EC Restriction of Hazardous Substances (RoHS) Directive
Page ii
Art Hicks
Chief Operating Officer
Cybex International, Inc.
10 Trotter Drive
Medway, MA 02053
Worldwide Headquarters 10 Trotter Drive + Medway, MA 02053, USA + t 508.533.4300 + f 508.533.5500
151 24th Avenue NW + Owatonna, MN 55060, USA + t 507.455.0217 + f 507.455.3446
Cybex 425T Treadmill Service Manual
As a result of test reports and their evaluation by accredited laboratories, we are in possession of the
following certificates for products which carry this marking:
Canada, USA
UL Std. No. 1647, FCC Part 15
Subpart B Class B
CAN/CSA-C22.2 No.68-92/99,
European Union 73/23/EEC, 89/336/EEC
References of harmonized standards on which this declaration of conformity is based:
EN 61000-6-1:2001 Electromagnetic Compatibility (EMC) Generic Immunity: Residential, Commercial
and Light Industrial
EN 61000-4-2 Electromagnetic compatibility (EMC) - Part 4-2: Testing and measurement techniques Electrostatic discharge immunity test
EN 61000-4-3 Electromagnetic compatibility (EMC) - Part 4-3: Testing and measurement techniques Radiated, radio frequency, and electromagnetic field immunity test
EN 61000-4-4 Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques Section 4: Electrical fast transient/burst immunity test
EN 61000-4-5 Electromagnetic compatibility (EMC)- Part 4-5: Testing and measurement techniques Surge immunity test
EN 61000-4-6 Electromagnetic compatibility (EMC) - Part 4-6: Testing and measurement techniques Immunity to conducted disturbances, induced by radio-frequency fields
EN 61000-4-11 Electromagnetic compatibility (EMC) - Part 4-11: Testing and measurement techniques Voltage dips, short interruptions and voltage variations immunity tests
Worldwide Headquarters 10 Trotter Drive + Medway, MA 02053, USA + t 508.533.4300 + f 508.533.5500
151 24th Avenue NW + Owatonna, MN 55060, USA + t 507.455.0217 + f 507.455.3446
Page iii
Cybex 425T Treadmill Service Manual
EN 61000-3-2 Electromagnetic compatibility (EMC) - Part 3-2: Limits - Limits for harmonic current emissions (equipment input current <= 16A per phase)
EN 61000-3-3 Electromagnetic compatibility (EMC) - Part 3-3: Limits - Limitation of voltage changes,
voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current <=
16 A per phase and not subject to conditional connection
EN 60335-1:2002 +A11:2004 +A1:2004 “Safety of Household and Similar Electrical Appliances”
EN 55022: 1998 (CISPR 22:1997), Class B Limits and Methods of Measurement of Radio Interference
Characteristics of Information Technology Equipment.
EN 957-6: Stationary training equipment: Treadmills, additional specific safety requirements and test
methods
ASTM F 2115: Standard for Motorized Treadmills
FCC Part 15, Subpart B - Class B Radiated and Conducted Emissions
CAN/CSA-C22.2 No. 68-92 (Reaffirmed 1999) “Motor-Operated Appliances (Household and
Commercial)”
ANSI / UL-1647 3rd Edition, March 28, 1997 Rev. May 9, 2006 Motor Operated Massage and Exercise
Machines
Page iv
Worldwide Headquarters 10 Trotter Drive + Medway, MA 02053, USA + t 508.533.4300 + f 508.533.5500
151 24th Avenue NW + Owatonna, MN 55060, USA + t 507.455.0217 + f 507.455.3446
Cybex 425T Treadmill Service Manual
Table of Contents
Front Pages
About this Manual . . . . . . . . . . . . . . . . . . i
FCC Compliance Information . . . . . . . . . . i
Declaration of Conformity . . . . . . . . . . . . ii
Table of Contents . . . . . . . . . . . . . . . . . . . v
1 Safety
Important Voltage Information . . . . . . . 1-1
Grounding Instructions . . . . . . . . . . . . . 1-1
Important Safety Instructions . . . . . . . . 1-2
Warning Decals . . . . . . . . . . . . . . . . . . 1-4
Caution Decals . . . . . . . . . . . . . . . . . . . 1-7
Emergency Stop Key (e-stop) . . . . . . . 1-7
2 Preventive Maintenance
Warnings/Cautions . . . . . . . . . . . . . . . . 2-1
Regular Maintenance Activities . . . . . . 2-1
Cleaning Your Treadmill . . . . . . . . . . . . 2-1
Running Belt Maintenance . . . . . . . . . . 2-3
Other Preventive Maintenance . . . . . . . 2-5
Service Schedule . . . . . . . . . . . . . . . . . 2-6
3 Customer Service
Contacting Service . . . . . . . . . . . . . . . . 3-1
Serial Number and Voltage . . . . . . . . . 3-1
Return Material Authorization (RMA) . . 3-2
Damaged Parts. . . . . . . . . . . . . . . . . . . 3-2
Ordering Parts . . . . . . . . . . . . . . . . . . . 3-3
4 Service
Warnings/Cautions . . . . . . . . . . . . . . . . 4-1
Test Mode . . . . . . . . . . . . . . . . . . . . . . 4-2
LED Functions . . . . . . . . . . . . . . . . . . . 4-3
Key Functions. . . . . . . . . . . . . . . . . . . . 4-3
Error Codes . . . . . . . . . . . . . . . . . . . . . 4-4
Motor Current and Voltage. . . . . . . . . . 4-4
Speed Sensor Adjustment . . . . . . . . . . 4-5
Speed Calibration. . . . . . . . . . . . . . . . . 4-6
Running Belt and Deck . . . . . . . . . . . . 4-7
End Caps . . . . . . . . . . . . . . . . . . . . . . . 4-8
Rear Roller . . . . . . . . . . . . . . . . . . . . . . 4-9
Front Roller . . . . . . . . . . . . . . . . . . . . . 4-10
Drive Belt . . . . . . . . . . . . . . . . . . . . . . 4-10
Motor Brushes 110 VAC. . . . . . . . . . . 4-12
Motor Brushes 220 VAC. . . . . . . . . . . 4-16
Drive Motor. . . . . . . . . . . . . . . . . . . . . 4-18
Lower Control Board . . . . . . . . . . . . . 4-20
Power Cord . . . . . . . . . . . . . . . . . . . . 4-22
Circuit Breakers . . . . . . . . . . . . . . . . . 4-23
Line Filter . . . . . . . . . . . . . . . . . . . . . . 4-24
Elevation Motor . . . . . . . . . . . . . . . . . 4-26
Upper Display Board . . . . . . . . . . . . . 4-28
Display Overlays . . . . . . . . . . . . . . . . . 4-29
Contact Heart Rate Grips. . . . . . . . . . 4-30
E-Stop Switch . . . . . . . . . . . . . . . . . . 4-31
Display Cable . . . . . . . . . . . . . . . . . . . 4-32
Parts List. . . . . . . . . . . . . . . . . . . . . . . 4-36
Exploded View . . . . . . . . . . . . . . . . . . 4-39
Schematic. . . . . . . . . . . . . . . . . . . . . . 4-40
Page v
Cybex 425T Treadmill Service Manual
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Page vi
Cybex 425T Treadmill Service Manual
1 - Safety
IMPORTANT: Read all instructions and warnings before using the treadmill.
Important Voltage Information
Before plugging the power cord into an electrical outlet, verify that the voltage requirements
for your area match the voltage of the treadmill that you have received. The power
requirements for the Cybex 425T treadmill include a grounded, dedicated circuit, rated for
one of the following: 115 VAC ±5%, 60 Hz and 15 amps; 208/220 VAC, 60 Hz and 10 amps
or 230 VAC ±5%, 50 Hz and 10 amps. See the serial number decal for the exact voltage
requirements of your treadmill.
! WARNING: Do not attempt to use this unit with a voltage adapter. Do not attempt to
use this unit with an extension cord.
! WARNING: Do not plug more than one unit into a single circuit.
Grounding Instructions
This treadmill must be grounded. If it should malfunction or break down, grounding provides
a path of least resistance for electric current to reduce the risk of electric shock. This product
is equipped with a cord having an equipment-grounding conductor and a grounding plug.
The plug must be plugged into an appropriate outlet that is properly installed and grounded in
accordance with all local codes and ordinances.
! DANGER:
Improper connection of the equipment-grounding conductor can result in a risk of
electric shock. Check with a qualified electrician or service provider if you are in doubt
as to whether the treadmill is properly grounded. Seek a qualified electrician to perform
any modifications to the cord or plug. Cybex is not responsible for injuries or damages
as a result of cord or plug modification.
This treadmill is for use on a nominal 115
VAC ±5%, 60 Hz and 15 amps, 208/220
VAC; 60 Hz, 10 amps or 230 VAC ±5%, 50
Hz and 10 amps and a grounded, dedicated
circuit. Make sure that the treadmill is
connected to an outlet having the same
configuration as the plug. Do not use a
ground plug adapter to adapt the power
cord to a non-grounded outlet.
115V Euro Plug 208/220V UK
NEMA 5-15 CEE 7/7 NEMA 6-15 230VAC
Safety
Page 1-1
Cybex 425T Treadmill Service Manual
Important Safety Instructions
(Save These Instructions)
! DANGER: To reduce the risk of electric shock, always unplug this treadmill from the
electrical outlet immediately after using it and before cleaning it.
! WARNING: Serious injury could occur if these precautions are not observed. To reduce
the risk of burns, fires, electric shock, or injury:
User Safety Precautions
• DO NOT wear loose or dangling clothing while using.
• Use the treadmill handrails for support and to maintain balance.
• Stop exercising if you feel faint, dizzy, or experience pain at any time and consult your
physician.
• Obtain a medical exam before beginning any exercise program.
• Read and understand emergency stop procedures.
• Replace any warning labels if damaged, worn or illegible.
• Report any malfunctions, damage or repairs to the facility.
• Place your feet on the two top steps when starting or stopping the treadmill.
• Stop and place the treadmill at 0 degrees incline (level) after each use.
• Keep children away from the treadmill. Teenagers and disabled persons must be
supervised.
• Obtain instruction before using.
• Keep all body parts, towels, and the like free and clear of moving parts.
• Read and understand the Owner’s Manual and all warnings posted on the unit before using.
• DO NOT use the unit if you exceed 350 lbs. (158 kg). This is the rated maximum user weight.
• Disconnect power before servicing.
Safety
Page 1-2
Facility Safety Precautions
• Instruct all users on how to clip the e-stop clip onto their clothing and carefully test it prior
to using the treadmill.
• Instruct all users to use caution when mounting and dismounting the treadmill.
Cybex 425T Treadmill Service Manual
• Use a dedicated line when operating the treadmill. NOTE: A dedicated line requires one
circuit breaker per unit.
• Connect the treadmill to a properly grounded outlet only.
• DO NOT operate electrically powered treadmills in damp or wet locations.
• Keep the running belt clean and dry at all times.
• DO NOT leave the treadmill unattended when plugged in and running. NOTE: Before
leaving the treadmill unattended, always wait until the treadmill comes to a complete
stop and is level. Then remove the plug from the outlet. Remove the e-stop key from the
treadmill.
• Immobilize the treadmill (when not in use) by removing the e-stop key.
• Inspect the treadmill for worn or loose components before each use. Do not use until worn
or damaged parts are replaced.
• Maintain and replace worn parts regularly. Refer to “Preventive Maintenance” section of
Owner’s Manual.
• DO NOT operate the treadmill if: (1) the cord is damaged; (2) the treadmill is not working
properly or (3) if the treadmill has been dropped or damaged. Seek service from a qualified
technician.
• DO NOT place the cord near heated surfaces or sharp edges.
• DO NOT use the treadmill outdoors.
• DO NOT operate the treadmill around or where aerosol (spray) or where oxygen products
are being used.
• Read and understand the Owner’s Manual completely before using the treadmill.
• Ensure all users wear proper footwear on or around all Cybex equipment.
• Set up and operate the treadmill on a solid, level surface. Do not operate in recessed areas
or on plush carpet.
• Provide the following clearances: 19.7 inches (0.5 m) at each side, 79 inches (2.0 m) at the
back and enough room for safe access and passage at the front of the treadmill. Be sure
your treadmill is clear of walls, equipment and other hard surfaces.
• DO NOT attempt repairs, electrical or mechanical. Seek qualified repair personnel when
servicing. If you live in the USA, contact Cybex Customer Service at 888-462-9239. If you
live outside the USA, contact Cybex Customer Service at 508-533-4300.
• Use Cybex factory parts when replacing parts on the treadmill.
• DO NOT modify the treadmill in any way.
• DO NOT use attachments unless recommended for the treadmill by Cybex.
• Ensure all User and Facility safety precautions are observed.
Safety
Page 1-3
Cybex 425T Treadmill Service Manual
• Carefully read and understand the following before using the 425T treadmill:
• Warning Decals
• Caution Decals
To replace any worn or damaged decals do one of the following: Visit www.
cybexinternational.com to shop for parts online, fax your order to 508-533-5183 or contact
Cybex Customer Service at 888-462-9239. If you live outside of the USA, call 508-533-4300.
For location or part number of labels, see the parts list and exploded-view diagram. This
information can be found in the Service chapter in this manual or on Cybex web site at www.
cybexinternational.com.
Warning Decals
Warning decals indicate a potentially hazardous situation, which, if not avoided, could result in
death or serious injury. The warning decals used on the Cybex 425T are shown below.
WARNING
1. Obtain a medical exam before beginning any exercise program.
2. Stop exercising if you feel faint, dizzy, or experience pain and consult your physician.
3. Obtain instruction before using. Lisez les instructions avant l'utilisation.
4. Read and understand the Owner’s Manual and all warnings posted on the unit before using.
5. Read and understand emergency stop procedures.
6. DO NOT wear loose or dangling clothing while using the treadmill.
7. Keep all body parts, hair, towels, water bottles and the like free and clear of moving parts.
8. Place your feet on the two top steps when starting or stopping the treadmill.
9. Use the treadmill handrails for support and to maintain balance.
10. Keep children away from the treadmill. Teenagers and disabled persons must be supervised
while using. Tenez les enfants éloignés. Les adolescents et les handicapés doivent être surveilles.
11. DO NOT use the unit if you exceed 350 lbs. (158 kg). This is the rated maximum user weight.
12. Report any malfunctions, damage or repairs to the facility.
13. Replace any warning labels if damaged, worn or illegible.
14. Stop and place the treadmill at 0 degrees incline (level) after each use.
SERIOUS INJURY COULD OCCUR IF
THESE PRECAUTIONS ARE NOT OBSERVED
DE-19189-4
DE-19189-4
Warning
Safety
Page 1-4
DE-19238
Warning
Motor Cover
Cybex 425T Treadmill Service Manual
DE-19238
Safety
Page 1-5
Cybex 425T Treadmill Service Manual
Safety
Page 1-6
DE-16928
Warning
Motor Cover
Cybex 425T Treadmill Service Manual
Caution Decals
Caution decals indicate a potentially hazardous situation, which, if not avoided, may result in
minor or moderate injury. There are no caution decals used on this unit. However, there are
caution statements listed in Chapters 5 and 6 of this manual. See Chapters 5 and 6.
Emergency Stop Key (e-stop)
The e-stop key functions as the emergency stop. In an emergency situation, remove the
e-stop key and the treadmill will come to a stop. Before using the treadmill, clip the e-stop
key as described below.
1. Clip the e-stop key to your clothing. NOTE: Be sure the string is free of knots and has
enough slack for you to run comfortably with the e-stop key in place.
2. Without falling off the treadmill, carefully step backward until the e-stop falls off the
treadmill. NOTE: If the e-stop clip falls off your clothing then the test has failed. Reclip the
e-stop clip to your clothing and repeat this step.
3. Replace e-stop after successfully testing the e-stop key. See the illustration shown below.
4. The treadmill is now ready to be used.
5. After use, remove the e-stop key from the treadmill.
NOTE: The e-stop key shall be removed to help prevent unauthorized use. Refer to the
Stopping the Treadmill section in the Operation chapter for more information about
the e-stop key.
Safety
Page 1-7
Cybex 425T Treadmill Service Manual
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Safety
Page 1-8
Cybex 425T Treadmill Service Manual
2 - Preventive Maintenance
Warnings/Cautions
All warnings and cautions listed in this chapter are as follows:
! WARNING: All maintenance activities shall be performed by qualified personnel.
Failure to do so could result in serious injury.
! WARNING: To prevent electrical shock, be sure that the treadmill is unplugged
from the electrical outlet before performing any cleaning or maintenance
procedures.
! WARNING: Keep wet items away from inside parts of the treadmill. Electrical shock
could occur even if the treadmill is unplugged. Do not touch components
on the lower board. A charge can remain after unplugging the power cord
and turning off the treadmill.
Regular Maintenance Activities
! WARNING: All maintenance activities shall be performed by qualified personnel.
Failure to do so could result in serious injury.
Preventive maintenance activities must be performed to maintain normal operation of your
treadmill. Keeping a log sheet of all maintenance actions will assist you in staying current with
all preventive maintenance activities. See Service Schedule located at the end of this chapter.
NOTE: Worn or damaged components shall be replaced immediately or the treadmill removed
from service until the repair is made.
NOTE: Cybex is not responsible for performing regular inspection and maintenance actions
for your treadmill. Instruct all personnel in equipment inspection and maintenance
actions and also in accident reporting/recording. Contact Cybex Customer Service at
888-462-9239 or 508-533-4300 for any preventive maintenance or service concerns.
Cleaning Your Treadmill
When cleaning your treadmill spray a mild cleaning agent, such as a water and dishsoap
solution, on a clean cloth first and then wipe the treadmill with the damp cloth.
Preventive
Maintenance
Page 2-1
Cybex 425T Treadmill Service Manual
NOTE: Do not spray cleaning solution directly on the treadmill. Direct spraying could cause
damage to the electronics and may void the warranty.
! WARNING: To prevent electrical shock, be sure that the treadmill is unplugged
from the electrical outlet before performing any cleaning or maintenance
procedures.
After Each Use — Wipe up any liquid spills immediately. After each workout, use a cloth to
wipe up any remaining perspiration from the handrails and painted surfaces.
Be careful not to spill or get excessive moisture between the edge of the display panel and
the console, as this might create an electrical hazard or cause failure of the electronics.
As Needed — Vacuum any dust or dirt that might accumulate under or around the treadmill.
Motors are especially susceptible to dust and dirt, and restricted airflow can prevent adequate
cooling that could shorten motor life. Cleaning this area should be done as often as indicated
in the Service Schedule.
! WARNING: Keep wet items away from inside parts of the treadmill. Electrical shock
could occur even if the treadmill is unplugged. Do not touch components
on the lower board. A charge can remain after unplugging the power cord.
To clean the motor components, you must raise the elevation to 15% elevation. Unplug the
treadmill and carefully lift the rear of the treadmill. Lift the treadmill until it rests on the top
of the console. Use a vacuum attachment or hand vacuum to clean the exposed elevation
assembly, drive motor, lower electronics and the surrounding areas. Wipe clean the underside
of the treadmill to prevent dirt and dust build-up.
Also use a dry cloth for the areas that you can’t reach with the vacuum cleaner. If the machine
has not been used for some time or is excessively dirty, use a dry cloth to wipe all exposed
areas.
Carefully lower the rear of the treadmill and roll it back from its present position to vacuum the
floor area underneath the unit. When finished, return the treadmill to its normal position.
Contact Heart Rate Grips — Contaminants, such as hand lotions, oils or body powder, may
come off on the contact heart rate grips. These can reduce sensitivity and interfere with the
heart rate signal. It is recommended that the user have clean hands when using the contact
heart rate. Clean the grips using a cloth dampened with a cleaning solution containing rubbing
alcohol. The grips are the only part of the treadmill you should use a cleaning solution containing
rubbing alcohol.
Preventive
Maintenance
Page 2-2
Cybex 425T Treadmill Service Manual
Running Belt Maintenance
Belt and Deck — Wipe the belt surface and the deck area with a clean dry towel to minimize
the effect of friction between the deck and the running belt. This should be done often to
prevent premature wear of the deck, running belt, and the drive motor system. See the
Service Schedule at the end of this chapter.
The running belt may become loose and slip on the drive roller with each foot plant. If it does,
follow the Tensioning and Centering the Belt procedure below. See the Service Schedule in
this chapter for a minimum schedule for checking the belt tension.
Tension and Center the Belt — If the belt is slipping under each step perform this
procedure:
Tools Required
• 3/4” Socket wrench
1. Tension the belt.
A. Use a 3/4” socket wrench to turn each bolt 1/2 turn clockwise. See Figure 1.
NOTE: Be sure to adjust each bolt equally on each side.
Figure 1
B. Press the Quick Start key.
C. Press the Speed
+ to bring the speed up to 3.5-4 mph (5.6-6.4 kph). Allow the
treadmill to run for a minute.
D. Observe the belt to be sure it stays centered. If it is not centered follow step 2.
E. Walk on the belt to see if it still slips. If it does restart this procedure at step 1 A. If you
have to do this procedure three times and it still slips call Cybex Customer Service.
Follow the next step to be sure the belt is centered.
NOTE: Be careful not to over tighten the belt. Over tightening the belt can cause the belt to
stretch and require replacement.
Preventive
Maintenance
Page 2-3
Cybex 425T Treadmill Service Manual
2. Center the belt.
NOTE: While centering the belt choose one bolt to adjust. Do not adjust both bolts.
A. With the treadmill running at 5 mph (8 kph) observe the running belt. If the belt tracks
off center to the right or left the deck will become exposed. Use a 3/4” socket wrench
to tighten the rear roller bolt on the side of the treadmill toward which the belt is
moving. For example: If the belt moves to the right and the deck becomes exposed
on the left, tighten the bolt on the right side of the frame, tighten about 1/2 of a turn
(clockwise) and wait 30 seconds. If the belt does not move back to the center of the
treadmill, make another adjustment to the same bolt. Once the running belt has been
adjusted closer to the center of the treadmill use about 1/4 of a turn until the belt has
been stabilized.
B. After the belt has been centered, check the belt tension again. Make sure the running belt
tension is tight enough so that the belt does not slip or hesitate when stepped on. Walk
on the treadmill at 3.5-4 mph (5.6-6.4 kph) and every 4th to 5th step throw your weight
into your step to feel if the belt is slipping. If the belt does slip, use a wrench to equally
tighten both rear roller adjustment bolts 1/2 of a turn (clockwise). Adjust the belt until no
further slipping is felt.
Checking the Belt and Deck Surfaces — The running belt and deck should be checked
periodically for any excessive wear. In an effort to make sure that the running belt operates
properly, visually inspect the belt often to make sure that there are no tears or fraying in the
belt material. The running belt, deck bushings and motor brushes should be replaced every
9,000 miles (14,500 km). The deck can be flipped once at 9,000 miles (14,500 km) then
replaced at the next interval. A service prompt will appear at this interval and the parts will
need to be replaced.
Inspect the edges of the belt as described below.
Tools Required
• None
1. Disconnect the external power source.
A. Unplug the treadmill from the power outlet.
2. Check the belt and deck condition.
A. Look at the edges of the belt while you roll it by hand. If the belt has any rips or looks
excessively worn the belt needs to be replaced.
B. Run your hand under the belt on the top of the deck surface. If you feel excessive
ridges or cracks, or if any wood is exposed under the black surface, the deck should
be replaced. In time, a worn belt and deck can cause high current draw and ultimately,
motor failure.
Preventive
Maintenance
Page 2-4
NOTE: If the running belt and deck need replacement refer to a qualified service technician.
Cybex 425T Treadmill Service Manual
Other Preventive Maintenance
Other preventive maintenance activities must be completed by a qualified service technician
at the recommended intervals listed in the Service Schedule at the end of this chapter. These
activities include:
• Measure the motor brushes and replace worn motor brushes
• Replace the running deck and bushings
• Replace the running belt
Elevation Motor Lubrication — In time the elevation motor pivot points may develop a
squeak. Lubricate the upper and lower bolts and the spacers with a small amount of lithium
grease. NOTE: You can buy lithium grease at an auto parts store.
Static Electricity — Depending upon where you live, you may experience dry air, causing a
common experience of static electricity. This may be especially true in the winter time. You
may notice a static build-up just by walking across a carpet and then touching a metal object.
The same can hold true while working out on your treadmill. You may experience a shock due
to the build-up of static electricity on your body and the discharge path of the treadmill. If you
experience this type of situation, you may want to increase the humidity to a comfortable level
through the use of a humidifier.
Preventive
Maintenance
Page 2-5
Cybex 425T Treadmill Service Manual
Service Schedule
All maintenance activities shall be performed by qualified personnel. Failure to do so could
result in serious injury.
NOTE: This is the minimum recommended service.
1. Determine mileage.
A. While in Dormant Mode enter Test Mode by pressing and holding the Heart Rate and
Level keys simultaneously for five seconds.
B. Press the Dist key. DIST appears on the display. Record Mileage. NOTE: Once the
unit exceeds 999 miles or kilometers the odometer will use both screens. Example:
12,805 miles or km would be displayed as 12 805 .
NOTE: To exit Test Mode, press the Pause/Stop key .
First 500 miles (800 km).
• Check running belt tension and tracking.
Every 5,000 miles (8,000 km).
• Check running belt tension and tracking.
• Move treadmill and vacuum underneath.
• Raise elevation to 15%, Carefully tip treadmill up on the console to clean underneath
with a dry cloth and vacuum. Return to normal position when done.
Every 9,000 miles (14,500 km).
• Replace running belt and deck.
• Replace deck bumpers.
• Replace drive motor brushes.
• Check elevation assembly and replace worn parts.
• Lubricate elevation pivot points.
NOTE: Every 9,000 miles (14,500 km) the unit will show “SVC” on the display. The unit will
then emit a short beep every 2 minutes. This will continue until the service is performed
and the service odometer is reset.
Preventive
Maintenance
Page 2-6
Cybex 425T Treadmill Service Manual
2. Resetting the service odometer.
A. While in Dormant Mode enter Test Mode by pressing and holding the Heart Rate and
Level keys simultaneously for five seconds.
B. Press the Cool Down key to display “SVC” and miles or kilometers on service
odometer.
C. Press the or key to display “RST”.
D. Press the Enter key to reset the service odometer to zero.
NOTE: Service may be performed before the 9,000 miles (14,500 km) service prompt appears.
Perform the service on the unit and follow the above procedure to reset the service
odometer to zero.
Preventive
Maintenance
Page 2-7
Cybex 425T Treadmill Service Manual
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Preventive
Maintenance
Page 2-8
Cybex 425T Treadmill Service Manual
3 - Customer Service
Contacting Service
Hours of phone service are Monday through Friday from 8:30 a.m. to 6:00 p.m. Eastern Standard Time.
For Cybex customers living in the USA, contact Cybex Customer Service at 888-462-9239.
For Cybex customers living outside the USA, contact Cybex Customer Service at 508-533-4300 or fax
508-533-5183.
Order parts and find information on the web at www.cybexinternational.com or by e-mail at techhelp@
cybexintl.com.
Serial Number and Voltage
Your serial number and voltage can be found on the rear of your treadmill. See Figure 1. For
your convenience record your serial number and voltage below so that you will have it ready if
you call Cybex Customer Service.
Serial Number Voltage
Serial
Number
Figure 1
Customer
Service
Page 3-1
Cybex 425T Treadmill Service Manual
Return Material Authorization (RMA)
The Return Material Authorization (RMA) system outlines the procedures to follow when
returning material for replacement, repair, or credit. The system assures that returned
materials are properly handled and analyzed. Follow the following procedures carefully.
Contact your authorized Cybex dealer on all warranty-related matters. Your local Cybex dealer
will request an RMA from Cybex, if applicable. Under no circumstances will defective parts
or equipment be accepted by Cybex without proper RMA and an Automated Return Service
(ARS) label.
1. Call the Customer Service Hotline listed above for the return of any item that is
defective.
2. Provide the technician with a detailed description of the problem you are having or the
defect in the item you wish to return.
3. Provide the model and serial number of your treadmill. The serial number is located on
the front panel of your treadmill. The serial number begins with a letter, for example:
R09-101331100.
4. At Cybex’s discretion, the technician may request that you return the problem part(s)
to Cybex for evaluation and repair or replacement. The technician will assign you an
RMA number and will send you an ARS label. The ARS label and RMA number must be
clearly displayed on the outside of the package that contains the item(s) to be returned.
Include a description of the problem, the serial number of the treadmill and the name
and address of the owner in the package along with the part(s).
5. Forward the package through UPS to Cybex.
Attn: Customer Service Department
Cybex International, Inc.,
10 Trotter Drive
Medway, MA 02053
NOTE: Merchandise returned without an RMA number on the outside of the package or
shipments sent C.O.D. will not be accepted by the Cybex receiving department.
Damaged Parts
Materials damaged in shipment should not be returned for credit. Shipping damages are the
responsibility of the carrier (UPS, Federal Express, trucking companies, etc.)
Customer
Service
Page 3-2
Apparent Damage — Upon receipt of your shipment, check all boxes carefully. Any damage
seen with a visual check must be noted on the freight bill and signed by the carrier’s agent.
Failure to do so will result in the carrier’s refusal to honor your damage claim. The carrier will
provide you with the required forms for filing such claims.
Cybex 425T Treadmill Service Manual
Concealed Damage — Damage not seen with a visual check upon receipt of a shipment
but noticed later must be reported to the carrier as soon as possible. Upon discovery of the
damage, a written or phone request to the carrier asking them to perform an inspection of the
materials must be made within ten days of the date of delivery. Keep all shipping containers
and packing materials: they will be needed as part of the inspection process. The carrier will
provide you with an inspection report and the necessary forms for filing a concealed damage
claim. Concealed damage is the carrier’s responsibility.
Ordering Parts
Visit www.cybexinternational.com to shop for parts online or fax your order to 508-533-5183.
To speak with a customer service representative, call 888-462-9239 (for customers living
within the USA) or 508-533-4300 (for customers outside the USA).
Customer
Service
Page 3-3
Cybex 425T Treadmill Service Manual
Customer
Service
Page 3-4
Cybex 425T Treadmill Service Manual
4 - Service
Warnings/Cautions
All warnings and cautions listed in this chapter are as follows:
! WARNING: All maintenance activities shall be performed by qualified personnel.
Failure to do so could result in serious injury.
! CAUTION: Use only Cybex replacement parts when servicing. Failure to do so could
result in personal injury.
! WARNING: Disconnect the power cord before beginning this procedure.
! CAUTION: During this procedure STAY OFF THE RUNNING BELT! Stand with your
feet on the two steps.
! CAUTION: Always use proper lifting methods when moving heavy items.
! WARNING: Drive belt is under tension. Do not pinch fingers while releasing tension.
! WARNING: Disconnect the power cord before beginning this procedure. Keep wet
items away from inside parts of the treadmill. Electrical shock could occur
even if the treadmill is unplugged. Do not touch components on the lower
board. A charge can remain after unplugging the power cord.
! WARNING: Drive Motor is heavy, use care when lifting.
! WARNING: Keep wet items away from inside parts of the treadmill. Electrical shock
could occur even if the treadmill is unplugged. Motor brush removal and
replacement should be performed by a qualified service technician.
! WARNING: Motor plate is heavy and will drop down when motor plate bolts are
removed.
Service
Page 4-1
Cybex 425T Treadmill Service Manual
! WARNING: All maintenance activities shall be performed by qualified personnel.
Failure to do so could result in serious injury.
For any service related concerns, call Cybex
Customer Service at 800-766-3211 (for
Cybex customers living within the USA). For
customers living outside the USA, call
508-533-4300 or fax 508-533-5183.
NOTE: Read and understand each procedure
thoroughly before servicing. Unless otherwise
noted “right” and “left” denote user orientation
for all procedures.
Test Mode
To enter Test Mode press and hold down the Heart Rate and Level keys simultaneously for
five seconds while in Dormant Mode. When the Heart Rate and Level keys are released the
software revision “rx.x” is shown on the display. To exit Test Mode press the Pause/Stop key
once.
Stuck Key List
If “key” and a number is displayed you can determine which key is stuck closed by referring
to the list below. If a key is stuck closed you may need to replace the upper or lower display
overlay. See Figure 1. Follow the Display Overlay procedure located in this chapter.
1 Cal/Hr
2 Aux
3 Channel + (opt.)
Upper
Overlay
4 Cool Down
5 Mets
manual
6 HR Control
7 Level
8 Enter
9 Incline Down
10 Speed -
programs
HR
control
Cybex International, Inc. Medway, MA USA (508) 533-4300 www.CybexInternational.com Wireless HR Receiver Inside
11 Channel - (opt.)
12 Time
13 Cal
14 Programs
15 Arrow Up
16 Arrow Down
17 Inline Up
18 Speed +
Lower
Overlay
Figure 1
VOLUMECHANNEL
19 Volume - (opt.)
21 Distance
23 Weight
24 Heart Symbol 25 Pause/Stop 26 Quick Start 27 Volume + (opt.)
29 Scan 30 Manual 32 Min/Mi/Km
Service
Page 4-2
Cybex 425T Treadmill Service Manual
LED Functions
LEDs are used to indicate the status of many of the treadmill inputs. After entering Test Mode
refer to the following list to check that these LEDs are functioning properly. See Figure 2.
Elevation sensor LED: On when 0% elevation sensor is active above 0% and off below 0%.
E-stop key sensor LED: Off when e-stop key is removed.
Speed sensor LED: Blinks on once per speed sensor pulse.
Heart rate sensor LED: Blinks on when hand grips are held and contact heart rate is
activated. Holding grips turns heart symbol Blue, Polar signal turns heart symbol Red.
HR
control
Cybex International, Inc. Medway, MA USA (508) 533-4300 www.CybexInternational.com Wireless HR Receiver Inside
VOLUMECHANNEL
Heart Rate
Sensor LED
Figure 2
Elevation
Sensor LED
E-stop Key
Sensor LED
Speed Sensor
LED
Key Functions
While in Test Mode press the following keys for desired information:
Quick Start Starts the belt at 1.0 mph (1.0 kph).
Manual Lights all of the LED segments for a short period of time.
Programs Lights all vertical LED segments for a short period of time.
HR Control Lights all horizontal LED segments for a short period of time.
Cool Down Displays service odometer. Maintenance prompt is activated every 9,000 miles
(14,484 km). Display shows “SVC” and beeps every 2 minutes. See Error Codes.
Dist Press once for odometer information (DST) to appear in the speed window.
Press again for hourmeter information (HRS) to appear in the speed window.
Press three times for number of starts information (USES) to appear in the
speed window.
Cal Displays motor pulse width (PWM) value
Min/mi/km Displays and cycles through error log. Up to 10 errors can be stored
Scan Clears error log when pressed twice while in error log mode.
Incline Run elevation motor up.
Incline Run elevation motor down.
Speed
Speed
+ Increase drive motor speed.
- Decrease drive motor speed.
Service
Page 4-3
Cybex 425T Treadmill Service Manual
Pause/Stop Press once to exit Test Mode.
Time Displays the setup constants, each of which may be modified by pressing the
Up and Down arrows. Each depression of Time cycles to the next parameter.
The Enter key must be pressed to save a changed value. See Setting Operation
Options in chapter 5 of the Owner’s Manual for details.
Up Arrow Increases display constants, see Time.
Down Arrow Decreases display constants, see Time.
Enter Required to save setup values. When pressed display reads “UPdt”.
Pause/End Exit the diagnostic mode and return to Dormant.
Error Codes
Error codes notify you of a problem condition and are displayed on the console. These codes
can also help to indicate the part of the treadmill most likely to be causing the problem. Errors
that present a hazard to the user provide a measure of safety by causing a one second beep,
stopping the treadmill and locking out operation of the treadmill. Reset power by unplugging
unit for a few seconds, then plug power cord into outlet.
A log of errors can be viewed and cleared. Enter Test Mode and press the Pace (min/mi/km)
key to display the log. The most recent error is always first in the log. Press the Pace key
again to cycle to the next the error stored. Up to 10 errors can be stored. Press the Scan key
twice to clear the error log. Press Pause/Stop to exit Test Mode.
NOTE: A processor upset can cause a bAd#. See H then G.
Error Description
bAd0 Bad checksum. See H then G.
bAd2 Internal RAM error. See H then G.
bAd3 Watchdog timeout. See H then G.
Err1 Belt didn’t start (or no speed sense). See I, E, D, B then A.
Err2 Underspeed (2 mph for 2 seconds without correction in process). See I, E, C then B.
Err3 Speed sense lost. See I, E, A, B and C.
Err5 No 0 switch sense within timed limits. This is declared when the timed
elevation reaches -2% without tripping the index. See F and A.
Err6 Overspeed (1 mph for 1 second or 2 mph for 0.2 seconds without
correction). See I, E.
Err7 EEPROM error (memory lost, loads new defaults, enters Test Mode). See G.
ErrE 0% always on (or switch disconnected or wired backwards). This means
that timed elevation has gone up 2% and the index is still sensed. See F.
SVC Maintenance prompt. Is activated every 9,000 miles (14,484 km). Display shows “SVC”
and beeps every 2 minutes. In Test Mode press “Cool Down” and then press up and
down arrows to display “RST” for reset. Press Enter to reset service odometer to zero.
Service
Page 4-4
Action
A Check lower board F Check elevation motor
B Check drive motor G Replace display board
C Check belt and deck H Reset power by unplugging unit for a few seconds,
D Check motor brushes then plug power cord into outlet
E Check speed sensor I Perform speed calibration procedure
Cybex 425T Treadmill Service Manual
Speed Sensor Adjustment
Tools Required
• Phillips head screwdriver
• 1/2” open end wrench (2)
! WARNING: Disconnect the power cord before beginning this procedure.
1. Disconnect the external power source.
A. Unplug the treadmill from the power outlet.
2. Remove the motor cover.
A. Using a Phillips head screwdriver,
loosen two screws on each motor
cover side (left and right). See Figure 3.
B. Using a Phillips head screwdriver,
loosen two screws on the front motor
cover. See Figure 3.
C. Lift the motor cover up and off the
treadmill. The screws will stay in place.
3. Adjust the speed sensor gap (if
needed).
NOTE: Do not overtighten nuts on plastic
speed sensor housing.
A. Using two 1/2” open end wrenches,
loosen the nuts that attaches the speed
sensor to the frame bracket.
See Figure 4.
Flywheel
B. Adjust the gap between
the speed sensor and the
magnet on the front roller to
1/4” (.635 cm) and tighten
the two nuts. See Figure 4.
Magnet
Gap
Screws
(2 on each side)
Figure 3
Motor
Cover
Screws(2)
4. Test for speed errors.
A. Connect the power cord to a
power outlet.
B. Bring the speed of the
treadmill up to maximum
speed, 11.0 mph (17.6 kph).
Speed
Sensor
Figure 4
Service
Page 4-5
Cybex 425T Treadmill Service Manual
C. After reaching maximum speed reduce the speed to 1.0 mph (1.6 kph). If a speed error
occurs then your speed sensor gap needs to be readjusted.
D. Press Pause/Stop.
E. Enter Test Mode again and check the error log for Error 3. If any new errors occurred,
readjust the speed sensor and test again. NOTE: If you are unsure whether an error is
new you can clear the error log by pressing the scan key twice and then repeat steps
3A through 4E.
F. Exit Test Mode by pressing Pause/Stop.
5. Secure the motor cover.
A. Lower the motor cover center into position. See Figure 3.
B. Using a Phillips head screwdriver, tighten the two screws on each side and the two
screws in the front of the unit.
Speed Calibration
1. Calibrate the speed.
A. Stay off the running belt during this procedure.
! CAUTION: During this procedure STAY OFF THE RUNNING BELT! Stand with your
feet on the two steps.
B. In Test Mode press and hold the Heart Rate and Time keys for five seconds. The
display will show “CAL”. The running belt will accelerate to three different speeds and
when completed the display will show “SAV”.
C. Press Pause/Stop to exit Test Mode. NOTE: This procedure should be completed
after replacing the upper display board, the lower control board or the drive motor. If
you press Pause/Stop during this procedure the calibration will not be stored. Exiting
Test Mode while the belt is moving may generate an error condition.
Service
Page 4-6
Cybex 425T Treadmill Service Manual
Running Belt and Deck
NOTE: During this procedure you will have the option to remove the running deck, running
belt, end caps, rear roller, front roller, rubber mounts and drive belt. Follow this
procedure from step 1 even though the heading for some of these procedures will
appear before the step where you remove that part.
Tools Required
• Phillips head screwdriver
• 7/16” socket wrench
1. Elevate the treadmill.
A. Without standing on the belt, press the Quick Start key and begin running the
treadmill.
B. Press the up arrow and elevate the treadmill fully
2. Disconnect the power.
A. While the treadmill is still fully elevated and running unplug the power cord from the
wall outlet.
3. Remove the motor cover.
A. Using a Phillips head screwdriver,
loosen two screws on each motor
cover side (left and right). See
Figure 3.
Flat Washers
(4 on Each Side)
B. Using a Phillips head screwdriver,
loosen two screws on the front motor
cover. See Figure 3.
Bolts
(4 on Each
Side)
C. Lift the motor cover up and off the
treadmill. The screws will stay in
place.
4. Remove the top platforms.
! CAUTION: Always use proper lifting
methods when moving heavy
items.
Split Washers
(4 on Each
Side)
A. Carefully lift the rear of the treadmill
until the top of the console is resting
on the floor.
B. Using a 7/16” socket wrench, remove
the four bolts, split washers and flat
washers that hold one of the top
platforms in place. Repeat this step
for the other side. See Figure 5.
Figure 5
Service
Page 4-7
Cybex 425T Treadmill Service Manual
C. Grasp each top platform and slide it up and off the treadmill.
End Caps
Tools Required
• Phillips head screwdriver
5. Remove the end caps.
A. Using a Phillips head
screwdriver, remove the two
screws securing each of the
bottom caps to the frame See
Figure 6.
B. Using a Phillips head
screwdriver, remove the three
screws securing each of the
lower top caps to the upper top
caps See Figure 7.
Figure 6
Bottom
Caps
Screws (2)
C. Using a Phillips head
screwdriver, remove the two screws
securing each of the upper top caps to
the top platforms See Figure 7.
6. Install the end caps.
A. Using a Phillips head screwdriver,
secure the two screws securing each
of the bottom caps to the frame See
Figure 6.
B. Using a Phillips head screwdriver, install
the two screws securing each of the
upper top caps to the top platforms See
Figure 7.
C. Using a Phillips head screwdriver, install
the three screws securing each of the
lower top caps to the upper top caps
See Figure 7.
Upper
Top
Cap
Screws (2)
Lower
Top
Cap
Screws (3)
Figure 7
Service
Page 4-8
Rear Roller
Cybex 425T Treadmill Service Manual
Bolt
Tools Required
• 3/4” socket wrench
• 7/16” socket wrench
• 3/16” allen wrench
7. Remove the rear roller.
A. Using a 3/4” socket wrench,
remove the two rear roller bolts,
bronze bushing and nut (one roller
bolt on each side). NOTE: Loosen
each bolt evenly, making sure not
to loosen either bolt too many turns
before moving to the other bolt. See
Figure 8.
B. Lift one side of the rear roller and slide
the roller out of the running belt. NOTE:
The nylon bushing and retaining ring will
remain in the frame. See Figure 8.
8. Remove the deck.
A. Using a 7/16” socket wrench, remove
the two screws, two split washers and
two flat washers that hold the back of
the deck in place. See Figure 9.
B. Using a 3/16” allen wrench, remove the
two screws, two split washers and two
flat washers that hold the front of the
deck in place. See Figure 9.
Rear
Roller
Nut
Figure 8
Bronze
Bushing
Running Belt
Retaining Ring
Nylon Bushing
Deck
7/16” Bolts
(2 on Each
Side)
Split Washers
(2 on Each
Side)
Flat Washers
(2 on Each Side)
C. If rotating or flipping the deck, make a
note on the deck so you know which
way it was positioned.
D. Remove the deck by sliding it sideways
out of the unit.
3/16” Bolts
(2 on Each
Side)
Figure 9
Service
Page 4-9
Front Roller
Cybex 425T Treadmill Service Manual
9. Remove the front roller.
! WARNING: Drive belt is under tension. Do not pinch
fingers while releasing tension.
Tools Required
• 3/4” socket wrench
• 7/16” socket wrench
A. Release drive belt tension by placing a Phillips
head screwdriver into the square hole located in the
bottom of the idler pulley assembly. See Figure 10.
B. While pushing down on the Phillips head screwdriver
carefully slide the drive belt off of the drive motor
pulley. Slowly release tension on the idler pulley
assembly.
C. Using a 9/16” socket wrench loosen the right front
roller bolt. See Figure 11. NOTE: The right bolt will
stay on the front roller. You do not need to remove it
for this procedure.
Idler
Arm
Square
Hole
Figure 10
D. Using a 9/16” socket wrench loosen the left front
roller bolt See Figure 11.
Front
Roller
E. Remove the front roller.
Figure 11
10. Remove the running belt.
A. With the front and rear rollers out of the unit you can now remove the running belt.
11. Inspect the rubber mounts.
A. Inspect the rubber mounts under the deck stiffeners for cracks or wear. NOTE:
Unscrew and replace the rubber mounts if the rubber is cracked or worn.
Drive Belt
12. Remove the drive belt.
A. If you are changing the drive belt, slip the drive belt around the flywheel pulley and off
the motor.
13. Install the running belt.
Bolt
Service
Page 4-10
A. Place the running belt in position on the unit. NOTE: It doesn’t matter which way the
running belt goes.
Cybex 425T Treadmill Service Manual
14. Secure the front roller.
A. Slide the front roller into the running belt.
B. Slide the new drive belt around the front roller before attaching the front roller.
C. Using a 9/16” socket wrench attach the two bolts that fasten the front roller to the
frame. NOTE: Tighten each of the two bolts evenly, making sure not to tighten one bolt
too many turns before moving to the other bolt.
15. Secure the drive belt.
A. Place the Phillips head screwdriver into the square hole located in the bottom of the
idler pulley assembly.
! WARNING: Do not pinch fingers while tensioning belt.
B. While pushing down on the Phillips head screwdriver carefully slide the drive belt into
the grooves on the flywheel pulley and front roller. Slowly release tension on the idler
pulley assembly.
C. Ensure that the drive belt is aligned properly in the grooves on the drive motor pulley
and front roller pulley.
16. Secure the running deck.
A. Place the deck in the correct position on the frame.
B. Using a 7/16” socket wrench, install the two screws, two split washers and two flat
washers that hold the back of the deck in place. See Figure 9.
C. Using a 3/16” allen wrench, install the two screws, two split washers and two flat
washers that hold the front of the deck in place. See Figure 9.
17. Secure the rear roller.
A. Slide the rear roller into the running belt. See Figure 8.
B. Install the bolt, bronze bushing and nut for each side of the roller into position. See
Figure 11.
C. Using a 3/4” socket wrench, tighten each rear roller bolt evenly, making sure not to
tighten either bolt too many turns before moving to the other bolt. NOTE: Do not
overtighten the belt. You will tension and center the belt in step 20. See Figure 8.
18. Secure the top platforms.
A. Place each top step in position.
B. Using a 7/16” socket wrench, install the four bolts, split washers and flat washers that
hold one of the top platforms in place. Repeat this step for the other side. See
Figure 5.
19. Secure the motor cover.
! CAUTION: Always use proper lifting methods when moving heavy items.
Service
Page 4-11
Cybex 425T Treadmill Service Manual
A. Carefully lower the treadmill to the ground.
B. Lower the motor cover center into position. See Figure 2.
C. Using a Phillips head screwdriver, tighten the two screws on each side and the two
screws in the front of the unit.
20. Adjust the running belt tension and tracking.
A. Follow the Tension and Center the Belt procedure located in the Preventive
Maintenance chapter of this manual.
Motor Brushes 110 VAC
Product Numbers SK-18553
NOTES: This procedure describes the replacement of motor brushes on the 425T model
treadmill.
Motor brushes are wear items that will periodically need to be replaced.
Both drive motor brushes must be replaced as a pair. This will ensure even
commutator contact and brush wear. However, the negative brush will wear 20%
faster than the positive brush. Therefore, always measure the negative brush length to
determine whether you should replace the pair. The negative brush is located closest
to the front of the frame. You should still check the positive brush for cracks or chips.
It is not necessary to remove the drive motor in order to reach the motor brushes.
Tools Required
• Phillips head screwdriver
• Flat head screwdriver
• 7/16” open end wrench
• 1/2” open end wrench
! WARNING: Keep wet items away from inside parts of the treadmill. Electrical shock
could occur even if the treadmill is unplugged. Motor brush removal and
replacement should be performed by a qualified service technician.
1. Read and understand all instructions thoroughly before installing this kit.
Service
Page 4-12
2. Verify the kit contents shown in
Figure 12.
A. Brush Assembly, 110 VDC, Red (1)
B. Brush Assembly, 110 VDC, Black (1)
C. Brush Retainer, Molded (2)
D. Wire tie, 18”, EH-12260 (1)
E. Wire tie, 9”, EH-00986 (3)
3. Remove motor cover.
Figure 12
A
B
C
D
E
Cybex 425T Treadmill Service Manual
A. Using a Phillips head screwdriver loosen but do not remove the two screws securing
the left motor cover in place. Loosen the two screws securing the right motor cover.
B. Lift the top motor cover up and off of the treadmill.
4. Elevate the treadmill.
A. Without standing on the belt, press the Start key and begin running the treadmill.
B. Press the up arrow and elevate the treadmill fully.
5. Disconnect the power.
A. While the treadmill is still fully elevated and running unplug the power cord from the wall
outlet.
6. Access drive motor.
A. Carefully lift the rear of the treadmill until the top of the console is resting on the ground.
! WARNING: Drive belt is under tension. Do not pinch fingers while releasing tension.
B. Release drive belt tension by placing the Phillips head screwdriver into the square hole
located in the bottom of the idler pulley assembly.
C. While pushing down on the Phillips head screwdriver carefully slide the drive belt off of the
drive motor pulley. Slowly release tension on the idler pulley assembly.
! WARNING: Motor plate is heavy and will drop down when motor plate bolts are
removed.
D. Using a 1/2” open end wrench remove the two motor plate bolts and washers.
E. Slowly and carefully lower the drive motor plate.
7. Disconnect the motor cables.
A. Locate the red and black drive motor cables exiting the drive motor and connected to A1
and A2 on the lower control board.
B. Disconnect the two motor cables from the lower board. ! WARNING: Avoid touching
lower board components such as resistors and capacitors.
C. Cut the wire ties securing the drive motor cables to the drive motor housing and other
cables on the lower control board.
D. Remove the ferrite from the two motor cables. Set aside for installation in step 11D.
E. Using the 7/16” open end wrench loosen the nut securing the wire clamp retainer at the
end of the motor. Remove drive motor cables from retainer.
Service
Page 4-13
Cybex 425T Treadmill Service Manual
8. Remove the black brush assembly.
A. Using a large flat head screwdriver pry out the brush retainer on the drive motor that
secures the black wire. The brush and spring will pop out.
9. Examine the brush and commutator.
A. Inspect the commutator by looking through the top brush holder into the motor. Slowly spin
the motor by turning the flywheel. Look for noticeable damage and for signs of wear such
as arcing, pitting, burning, or uneven wear. Commutator bars that are ‘dirty penny’ brownish
copper are in great condition. Also, some commutator bars may be pitted or blackened
on one edge. Too many of these indicate a worn commutator, and the motor should be
replaced. The commutator may be cleaned with narrow commutator stone if carbon
build-up is present. Brush dust can be loosened from the motor surfaces where the brush
is placed by lightly filing the surfaces. Dirt and brush dust should be vacuumed out of the
motor.
B. Inspect the brushes for signs of excessive wear or
cracks. The motor brushes must be replaced if one
or both is worn to .375” (9.5 mm) or less in length, is
broken or chipped, has a broken spring, or binds in
the motor. See Figure 13.
10. Replace the black brush assembly.
A. Slide the new brush into the motor brush holder. If
the new brush does not slide in and out easily, the
edges or corners of the brush can be lightly filed
down. If cleaning the motor, (see step 9A), and filing
the brush doesn’t allow the brush to slide easily in
the brush holder, the motor should be replaced.
NOTE: The motor may make a clicking noise as new
brushes wear in. If you reinstall the original brushes
Figure 13
it is good to install them facing their original position.
Reversing the orientation of the brush can cause a
clicking noise during operation until the brushes wear in.
B. Fully compress the spring by pushing as far into the brush holder as possible.
C. While compressing the spring, place the new brush retainer into the motor housing until
the brush retainer is fully seated into the motor housing.
D. Repeat steps 8A to 10C for the red brush assembly.
Service
Page 4-14
11. Connect the drive motor cables.
A. Place the new drive motor cables into the wire clamp retainer at the end of the motor.
B. Using the 7/16” open end wrench tighten the nut securing the drive motor cables in the
wire clamp retainer.
Cybex 425T Treadmill Service Manual
C. Secure the drive motor cables to the drive motor housing with a wire tie.
D. Attach the ferrite removed in step 7D around the two drive motor cables.
E. Connect the drive motor cables to the lower board. The black wire connects to A2, The
red wire connects to A1 ! WARNING: Avoid touching lower board components such
as resistors and capacitors.
F. Secure the drive motor cables to the other cables in the lower control board with two wire
ties.
12. Secure drive motor plate
A. Slowly and carefully raise the drive motor plate.
B. Using a 1/2” open end wrench secure the two motor plate bolts and washers removed is
step 6D.
13. Install drive belt.
A. Place the Phillips head screwdriver into the square hole located in the bottom of the idler
pulley assembly.
! WARNING: Do not pinch fingers while tensioning belt.
B. While pushing down on the Phillips head screwdriver carefully slide the drive belt into the
grooves on the drive motor pulley and front roller. Slowly release tension on the idler pulley
assembly.
C. Ensure that the drive belt is aligned properly in the grooves on the drive motor pulley and
front roller pulley.
14. Lower treadmill.
A. Carefully lower the rear of the treadmill until the back feet are resting on the ground.
15. Install motor cover.
A. Place the top motor cover into position.
B. Using a Phillips head screwdriver tighten the two screws securing the left motor cover
in place. Tighten the two screws securing the right motor cover.
16. Test the unit for proper operation.
A. Connect the treadmill to the power outlet.
B. The treadmill will lower itself. Wait until the treadmill resets its elevation to 0%.
C. Operate the unit at all levels to verify proper operation.
Service
Page 4-15
Cybex 425T Treadmill Service Manual
Motor Brushes 220 VAC
Product Numbers SK-18554
NOTES: This procedure describes the replacement of motor brushes on the 425T model
treadmill.
Motor brushes are wear items that will periodically need to be replaced.
Both drive motor brushes must be replaced as a pair. This will ensure even
commutator contact and brush wear. However, the negative brush will wear 20%
faster than the positive brush. Therefore, always measure the negative brush length to
determine whether you should replace the pair. The negative brush is located closest
to the front of the frame. You should still check the positive brush for cracks or chips.
It is not necessary to remove the drive motor in order to reach the motor brushes
Tools Required
• Flat head screwdriver
• Needle nose pliers
! WARNING: Keep wet items away from inside parts of the treadmill. Electrical shock
could occur even if the treadmill is unplugged. Motor brush removal and
replacement should be performed by a qualified service technician.
1. Read and understand all instructions thoroughly before installing this kit.
2. Verify the kit contents shown in
Figure 14.
A. Brush Assembly, 220 VDC (2)
A
B
C
B. Spring Assembly (2)
C. Cover, Brush access (2)
3. Elevate the treadmill.
A. Without standing on the belt,
press the Start key and begin
running the treadmill.
Figure 14
B. Press the up arrow and elevate the treadmill fully.
4. Disconnect the power.
Service
Page 4-16
A. While the treadmill is still fully elevated and running unplug the power cord from the wall
outlet.
B. Carefully lift the rear of the treadmill until the top of the console is resting on the ground.
Cybex 425T Treadmill Service Manual
5. Remove the brush access covers.
A. Using a flat head screwdriver pry off both brush access covers on the drive motor.
6. Remove the brushes.
A. Using the needle nose pliers pry the brush wire connector off of the terminal in the drive
motor.
B. Using your fingers press in the spring clip until the locking tab disengages and the
spring can be removed from the brush holder.
C. Repeat steps 6A and 6B for other brush.
7. Examine the brush and commutator.
A. Inspect the commutator by looking through the top brush holder into the motor. Slowly spin
the motor by turning the flywheel. Look for noticeable damage and for signs of wear such
as arcing, pitting, burning, or uneven wear. Commutator bars that are ‘dirty penny’ brownish
copper are in great condition. Also, some commutator bars may be pitted or blackened
on one edge. Too many of these indicate a worn commutator, and the motor should be
replaced. The commutator may be cleaned with narrow commutator stone if carbon buildup is present. Brush dust can be loosened from the motor surfaces where the brush is
placed by lightly filing the surfaces. Dirt and brush dust should be vacuumed out of the
motor.
B. Inspect the brushes for signs of excessive wear or cracks. The motor brushes must be
replaced if one or both is worn to .375” (9.5 mm) or less in length, is broken or chipped,
has a broken spring, or binds in the motor. See Figure 13.
8. Replace the brushes.
A. Slide the new brush into the motor brush holder. If the new brush does not slide in and
out easily, the edges or corners of the brush can be lightly filed down. If cleaning the
motor, (see step 7A), and filing the brush doesn’t allow the brush to slide easily in the
brush holder, the motor should be replaced.
NOTE: The motor may make a clicking noise as new brushes wear in. If you reinstall the
original brushes it is good to install them facing their original position. Reversing the
orientation of the brush can cause a clicking noise during operation until the brushes
wear in.
B. Insert a new spring assembly (B) into the brush housing until the locking tab engages.
C. Using the needle nose pliers slide the brush wire connector onto the drive motor
terminal.
D. Install a new brush access cover by pressing until the end tabs click into place.
E. Repeat steps 8A to 8D for the other brush.
Service
Page 4-17
Cybex 425T Treadmill Service Manual
9. Lower treadmill.
A. Carefully lower the rear of the treadmill until the back feet are resting on the ground.
10. Test the unit for proper operation.
A. Connect the treadmill to the power outlet.
B. The treadmill will lower itself. Wait until the treadmill resets its elevation to 0%.
C. Operate the unit at all levels to verify proper operation.
Drive Motor
Tools Required
• Phillips head screwdriver
• 1/2” Open end wrench
• 1/2” Socket wrench with a 6” extension
! WARNING: Disconnect the power cord before beginning this procedure. Keep wet
items away from inside parts of the treadmill. Electrical shock could occur even if the
treadmill is unplugged. Do not touch components on the lower board. A charge can
remain after unplugging the power cord.
1. Disconnect the external power source.
A. Unplug the treadmill from the power outlet.
2. Remove the motor cover.
A. Using a Phillips head screwdriver, loosen two screws on each motor cover side (left
and right). See Figure 3.
B. Using a Phillips head screwdriver, loosen two screws on the front motor cover. See
Figure 3.
C. Lift the motor cover up and off the treadmill. The screws will stay in place.
3. Release the drive belt tension.
A. Release drive belt tension by placing a Phillips head screwdriver into the square hole
located in the bottom of the idler pulley assembly. See Figure 10.
B. While pushing down on the Phillips head screwdriver carefully slide the drive belt off
of the drive motor pulley. Slowly release tension on the idler pulley assembly.
Service
Page 4-18
4. Access drive motor.
! WARNING: Motor plate is heavy and will drop down when motor plate bolts are
removed.
Cybex 425T Treadmill Service Manual
A. Using a 1/2” open end wrench remove the
two motor plate bolts. See Figure 15.
B. Slowly and carefully lower the drive motor
plate.
5. Disconnect the motor cables.
A. Locate the red and black drive motor cables
exiting the drive motor and connected to A1
and A2 on the lower control board.
B. Disconnect the two motor cables from the
lower board. ! WARNING: Avoid touching
lower board components such as
resistors and capacitors.
Motor
Plate
Bolts and
Washers
C. Cut the wire ties securing the drive motor
cables to the lower control
board bracket.
D. Remove the ferrite from the
two motor cables. Set aside
for installation in step 11D.
6. Remove Drive motor.
A. Using a 1/2” socket with a
6” extension remove the
four mounting nuts securing
the drive motor to the motor
base plate. See Figure 16.
! WARNING: Drive Motor is heavy,
use care when
lifting.
B. Lift the drive motor up and
out of the motor base plate.
Figure 15
Drive Motor
Base Plate
Drive
Motor
Mounting
Nuts (4)
Figure 16
Service
Page 4-19
Cybex 425T Treadmill Service Manual
7. Install Drive motor.
! WARNING: Drive Motor is heavy, use care when lifting.
A. Lift the drive motor up and into the motor base plate.
B. Using a 1/2” socket with a 6” extension secure the drive motor to the motor base plate
using four mounting nuts.
8. Connect the motor cables.
A. Locate the red and black drive motor cables exiting the drive motor.
B. Connect the two motor cables from the lower board. ! WARNING: Avoid touching
lower board components such as resistors and capacitors.
C. Install the ferrite from the two motor cables.
D. Using wire ties secure the drive motor cables to the lower control board bracket.
NOTE: The calibration procedure will need to be completed after replacing the drive motor.
Follow the Speed Calibration procedure located in this chapter.
Lower Control Board
NOTE: This procedure will cover the lower control board, power cord, circuit breakers and
line filter. Follow this procedure from step 1 even though the heading for some of
these procedures will appear before the step where you remove that part.
Tools Required
• Phillips head screwdriver
• ESD (Electro Static Discharge) grounding strap
! WARNING: Disconnect the power cord before beginning this procedure. Keep wet
items away from inside parts of the treadmill. Electrical shock could occur
even if the treadmill is unplugged. Do not touch components on the lower
board. A charge can remain after unplugging the power cord.
1. Disconnect the cables from the lower control board.
A. Disconnect the cables from the lower control board. This includes: the elevation motor
cables (COM, UP, DOWN and GND); Ground cable; elevation switch (P1); display
cable (P3); speed sensor (P2); display cable (P4); AC line hot, black (AC1); AC line
neutral, white (AC2); drive motor cable red (A1) and drive motor cable black (A2). See
Figure 17.
Service
Page 4-20
Elevation
COM
Elevation
UP
Elevation
DOWN
Elevation
Ground
Ground
Cable
Elevation
Switch P1
Display
Cable P3
Speed
Sensor P2
Cybex 425T Treadmill Service Manual
Display
Cable P4
AC Line
Neutral
Black AC1
Black
Motor
-A2
Red
Motor +
A1
AC Line
Neutral
White AC2
Mounting
Screw (2)
Figure 17
2. Remove the lower control board.
A. Raise the motor base plate.
B. Using a Phillips head screwdriver, remove the two screws that hold the lower control
board to the motor base plate.
C. Lower the motor base plate.
D. Using a Phillips head screwdriver, remove the two screws that hold the lower control
board to the motor base plate. See figure 17.
E. Remove the lower board. NOTE: Cybex may want this part back for evaluation.
Contact Cybex Customer Service at 800-766-3211.
3. Replace the lower control board and bracket.
NOTE: Wear an ESD strap for the rest of this procedure.
A. Position the lower control board bracket in place on the motor base plate.
B. Using a Phillips head screwdriver, install the two screws that hold the lower control
board to the motor base plate. Do not fully tighten at this time.
C. Raise the motor base plate.
D. Using a Phillips head screwdriver, install the two screws that hold the lower control
board to the motor base plate.
E. Lower the motor base plate and fully tighten the screws installed in step 5B.
Service
Page 4-21
Cybex 425T Treadmill Service Manual
4. Connect the cables to the lower control board.
A. Connect the cables from the lower control board. This includes: the elevation motor
cables (COM, UP, DOWN and GND); Ground cable; elevation switch (P1); display
cable (P3); speed sensor (P2); display cable (P4); AC line hot, black (AC1); AC line
neutral, white (AC2); drive motor cable red (A1) and drive motor cable black (A2). See
Figure 17.
5. Secure the wires.
A. Check to see that all of the cables are connected firmly in their proper place.
NOTE: The calibration procedure will need to be completed after replacing the lower control
board. Follow the Speed Calibration procedure located in this chapter.
Power Cord
Tools Required
• 3/8” Nutdriver or socket wrench
• ESD (Electro Static Discharge) grounding strap
! WARNING: Disconnect the power cord before beginning this procedure. Keep wet
items away from inside parts of the treadmill. Electrical shock could occur
even if the treadmill is unplugged. Do not touch components on the lower
board. A charge can remain after unplugging the power cord.
6. Disconnect the external power source.
A. Unplug the treadmill from the power outlet.
7. Remove power cord.
A. Using a 3/8” nutdriver or socket wrench remove the nut securing the ground wire to
the motor base plate. See Figure 18.
B. Unplug the black and white fast-on connectors from the circuit breakers. See
Figure 18.
C. Remove the old power cord and discard.
8. Install the power cord.
Service
Page 4-22
A. Insert the new power cord throught the strain relief in the motor base plate.
B. Using a 3/8” nutdriver or socket wrench secure the ground wire to the motor base
plate.
NOTE: Each circuit breaker must have the same color cable connected to it. DO NOT mix the
black and white wires.
C. Connect the black fast-on connectors from the power cord to the circuit breaker with
the black wire. See Figure 18.
D. Connect the white fast-on connectors from the power cord to the circuit breaker with
the white wire. See Figure 18.
AC Line 2
(AC2)
Figure 18
Line
Filter
AC Line 1 (AC1)
Circuit
Breakers
Ground
Wire
Stud
Lower
Board
Power
Cord
Strain
Relief
Circuit Breakers
Tools Required
• Flat head screwdriver
9. Remove the circuit breakers.
A. Disconnect the four fast-on connectors that connect to the circuit breakers.
B. Using a flat head screwdriver, press the mounting clip on the circuit breaker and tilkt
the circuit breaker sideways.
C. Using the flat head screwdriver press in the other mounting clip and remove the circuit
breaker from the mounting plate. Repaet for the other circuit breaker.
10. Install the circuit breakers.
A. Insert the new circuit breakers into the holes in the mounting plates until they snap in.
NOTE: Each circuit breaker must have the same color cable connected to it. DO NOT mix the
black and white wires.
B. Connect the two white fast-on connectors the the front circuit breaker. See Figure 18.
C. Connect the two black fast-on connectors the the front circuit breaker. See
Figure 18.
Service
Page 4-23
Cybex 425T Treadmill Service Manual
Line Filter
Tools Required
• Phillips head screwdriver
11. Replace the line filter.
NOTE: Take notice of which cables are connected to the line filter.
A. Disconnect the two fast-ons connectors that go from the line filter to the lower board
(cables labeled AC1 and AC2 on the lower board). See Figure 18.
B. Disconnect the two fast-ons connectors that go from the line filter to the circuit
breakers. See Figure 18.
C. Using a Phillips head screwdriver, remove the two screws that hold the line filter to the
motor base plate.
D. Place the new line filter in position on the motor base plate.
E. Using a Phillips head screwdriver, secure the two screws that hold the line filter to the
lower control bracket.
12. Connect the line filter cables.
A. Connect the white cable (AC2) from the lower board to the front left terminal on the
line filter. See Figure 18.
B. Connect the black cable (AC1) from the lower board to the back left terminal on the
line filter. See Figure 18.
C. Connect the white cable from the circuit breaker to the front right terminal on the line
filter. See Figure 18.
D. Connect the black cable from the circuit breaker to the back right terminal on the line
filter. See Figure 18.
NOTE: Do not connect a cable to the line filter terminal on the upper right side.
13. Attach drive motor plate.
! WARNING: Motor plate is heavy and will drop down when motor plate bolts are
removed.
Service
Page 4-24
A. Slowly and carefully raise the drive motor plate.
B. Using a 1/2” open end wrench install the two motor plate bolts and washers. See
Figure 12.
Cybex 425T Treadmill Service Manual
14. Secure the drive belt.
A. Place the Phillips head screwdriver into the square hole located in the bottom of the
idler pulley assembly.
! WARNING: Do not pinch fingers while tensioning belt.
B. While pushing down on the Phillips head screwdriver carefully slide the drive belt into
the grooves on the flywheel pulley and front roller. Slowly release tension on the idler
pulley assembly.
C. Ensure that the drive belt is aligned properly in the grooves on the drive motor pulley
and front roller pulley.
15. Lower treadmill.
A. Carefully lower the rear of the treadmill until the back feet are resting on the ground.
16. Install motor cover.
A. Place the top motor cover into position.
B. Using a Phillips head screwdriver tighten the two screws securing the left motor cover in place.
Tighten the two screws securing the right motor cover.
17. Test the unit for proper operation.
A. Connect the treadmill to the power outlet.
B. The treadmill will lower itself. Wait until the treadmill resets its elevation to 0%.
C. Operate the unit at all levels to verify proper operation.
Service
Page 4-25
Cybex 425T Treadmill Service Manual
Elevation Motor
Tools Required
• Phillips head screwdriver
• 9/16” Open end wrench
• 9/16” Socket wrench
! WARNING: Disconnect the power cord before beginning this procedure. Keep wet
items away from inside parts of the treadmill. Electrical shock could occur
even if the treadmill is unplugged.
1. Disconnect the external power source.
A. Unplug the treadmill from the power outlet.
2. Remove the motor cover.
A. Using a Phillips head screwdriver, loosen two screws on each motor cover side (left
and right). See Figure 3.
B. Using a Phillips head screwdriver, loosen two screws on the front motor cover. See
Figure 3.
C. Lift the motor cover up and off the treadmill. The screws will stay in place.
3. Disconnect the elevation motor cable.
A. Cut the wire tie and disconnect the elevation motor cable from the cable connector plate.
4. Remove the elevation motor.
A. Using a 9/16” open end wrench and
a 9/16” socket wrench, remove the
two bolts on the elevation motor (one
Elevation
Motor
Frame
at the top and one at the bottom).
NOTE: Hold the motor while you
remove the second bolt so that it
doesn’t fall.
B. Carefully lift and remove the elevation
motor from the treadmill.
10.25”
(26 cm)
5. Calibrate the elevation motor.
A. The switch should be at zero elevation
before adjusting the tube nut. If
necessary connect the elevation
motor, bring the elevation up to 1%
incline and then back down to 0%.
Bolts
Nuts
Tube
Service
Page 4-26
B. Turn the tube with your fingers until
it measures 10.25” (26 cm) from the
center of the top hole to the center of
the bottom hole. See Figure 19.
Figure 19
Cybex 425T Treadmill Service Manual
6. Secure the elevation motor.
A. Carefully place the elevation motor in position on the treadmill. See Figure 19.
B. Slide both bolts into the slots and attached the hex nuts as shown in Figure 19.
C. Using a 9/16” open end wrench and a 9/16” socket wrench, securely tighten the nuts
and two bolts installed in step 7B.
D. Connect the elevation motor cable to the cable connector plate.
E. Tie the elevation cable with a wire tie to the frame.
7. Secure the motor cover.
A. Lower the motor cover center into position. See Figure 3.
B. Using a Phillips head screwdriver, tighten the two screws on each side and the two
screws in the front of the unit.
! CAUTION: Always use proper lifting methods when moving heavy items.
C. Carefully lower the treadmill to the floor
8. Test the elevation motor.
A. Connect the main power cord into the power outlet.
B. Start the treadmill in Manual Mode and raise the elevation to maximum.
D. Lower the elevation to zero percent.
E. Operate the unit at all levels to verify proper operation.
Service
Page 4-27
Cybex 425T Treadmill Service Manual
Upper Display Board
NOTE: This procedure will cover the upper display board, display overlays, contact heart rate
grips, e-stop switch and display cable.
Tools Required
• Phillips head screwdriver
• ESD (Electro Static Discharge) grounding strap
1. Disconnect the external power source.
A. Unplug the treadmill from the power outlet.
NOTE: The display board is susceptible to damage from a discharge of static electricity.
While handling parts underneath
the console cover use an ESD
grounding strap. This eliminates
the potential voltage (static)
difference between you and the
equipment you are working on.
Wear an ESD strap for the rest of
this procedure.
Back
Cover
Console
Assembly
Service
Page 4-28
2. Remove the console assembly
from the handrail.
A. Using a Philips head screwdriver
remove the two screws securing
the back cover to the console
assembly. See Figure 20.
B. Using a Philips head
screwdriver remove the two
machine screws securing the
console assembly to the upright
assembly. See Figure 21.
C. Using a Philips head
screwdriver remove the seven
screws that hold the console
assembly to the console back.
See Figure 21.
D. Gently tilt the concole assembly
forward and disconnect these
cables from the display board:
the display cable (2 connectors),
the contact heart rate cable, the
Polar cable and the ground wire.
See Figure 22.
Screws
Figure 20
Console
Assembly
Console
Back
Screws
Upright
Assembly
Machine Screw
Figure 21
Ground
Wire
Cybex 425T Treadmill Service Manual
Mounting
Screws (5)
Polar Heart
Rate Cable
Display
Cable
(2 Connectors)
Contact
Heart Rate
Cable
Figure 22
E. Remove the console assembly.
3. Remove the display board.
A. Using a Phillips head screwdriver, remove the five screws that hold the display board
to the console. See Figure 22.
B. Gently flip the display board over and disconnect the upper switch membrane and the
lower switch membrane.
NOTE: The calibration procedure will need to be completed after replacing the upper display
board. Follow the Speed Calibration procedure located in this chapter.
Display Overlays
Tools Required
• Phillips head screwdriver
• ESD (Electro Static Discharge) grounding strap
• Razor blade
4. Remove the display overlay.
A. Use a razor blade to peel up a corner of the display overlay and pull off the overlay.
5. Attach the display overlay.
A. Remove the paper backing from the new display overlay.
B. Slide the ribbon cable through the (upper two or lower one) slot.
Service
Page 4-29
Cybex 425T Treadmill Service Manual
C. Carefully place the display overlay in position within the indentation on the console
front and firmly rub the display overlay so that it adheres to the console.
D. Connect the upper switch membrane and the lower switch membrane to the display
board.
6. Attach the display board.
A. Place the display board in position on the front console.
B. Using a Phillips head screwdriver, secure the five screws that hold the display board to
the console.
Contact Heart Rate Grips
Tools Required
• Phillips head screwdriver
• Knife or small flathead screwdriver
• Needle nose pliers
• Wire cutters
7. Remove the old heart rate grips and cable.
A. Using a knife or flathead screwdriver, pry up the four metal contacts from the two grips.
NOTE: The metal contacts are taped on securely and prying them up will destroy them.
B. Using a needle nose pliers, carefully disconnect the wire from each metal contact.
C. Using a Phillips head screwdriver,
remove the two bolts and two nuts
from each grip.
Double-sided
Tape
Cap
D. Pull the plastic housing and cap
off each handrail (the housing is
secured with double-sided tape).
See Figure 23.
E. Gently push each connector out of
the rectangular hole in the plastic
O-Ring
Wire Through
Rectangular Hole
housing. See Figure 23.
F. Remove any remaining double-
Figure 23
sided tape from each handrail.
G. Remove the old o-ring from each handrail. See Figure 23.
Plastic
Housing
Service
Page 4-30
H. Using wire cutters, cut the wire tie that holds the heart rate cable to the handrail.
I. Pull the old heart rate cable out of the handrail.
Cybex 425T Treadmill Service Manual
E-Stop switch
Console Back
Tools Required
• Phillips head screwdriver
• Wire cutters
8. Remove the console
back plate.
A. Using a Philips head
screwdriver remove
the ten screws
securing the console
Upright
Assembly
Screws
back from the upright
assembly. See
Figure 24
Figure 24.
B. Using a Philips head screwdriver remove the two screws that secure the console
backin place. See Figure 25.
Screws
Console
Back
Accesory
Tray
Upright
Screw
Figure 26
Assembly
Figure 25
9. Remove the accesory tray.
A. Using a Philips head screwdriver remove the screw securing the accesory tray to the
lower handle cover. See Figure 26.
Service
Page 4-31
Cybex 425T Treadmill Service Manual
10. Remove the lower handle cover.
A. Using a Philips head screwdriver remove the two screws securing the lower handle
cover to the upper handle cover. See Figure 27.
Upper
Handle
Cover
Lower
Handle
Cover
Screws
Screws
Figure 27
Figure 28
11. Remove the e-stop switch.
A. Using a Philips head screwdriver remove the two screws securing the e-stop switch.
See Figure 28.
12. Install the e-stop switch.
E-Stop
Switch
A. Using a Philips head screwdriver install the two screws securing the e-stop switch.
See Figure 28.
Display Cable
Tools Required
• Wire cutters
13. Remove the display cable.
A. Disconnect the display cable from the
connector plate in the base. See Figure
29.
B. Using wire cutters, cut the wire ties on
top of the handrail and the contact heart
rate cable.
C. Pull the display cable out of the handrail.
Display
Cable
Base
Service
Page 4-32
Figure 29
Cybex 425T Treadmill Service Manual
14. Attach the new display cable.
A. Push the new display cable down through the handrail and out the handrail’s bottom
hole.
B. Plug the display cable into the connector plate in the base. See Figure 29.
C. Secure the display cable with wire ties to the handrail.
15. Install the lower handle cover.
A. Using a Philips head screwdriver install the two screws securing the lower handle
cover to the upper handle cover. See Figure 27.
16. Install the accesory tray.
A. Using a Philips head screwdriver install the screw securing the accesory tray to the
lower handle cover. See Figure 26.
17. Install the console back plate.
A. Using a Philips head screwdriver install the ten screws securing the console back from
the upright assembly. See Figure 24.
B. Using a Philips head screwdriver install the two screws that secure the console backin
place. See Figure 25.
18. Connect the cables.
A. Connect these cables into the display board: the display cable (2 connectors), the
contact heart rate cable, the Polar cable and the ground wire. See Figure 25.
19. Check the connections.
A. Check to see that all of the cables are connected firmly in their proper place.
20. Install the console back to the upright assembly.
A. Locate the console back and twelve screws.
B. Place the console back in the correct position on the upright assembly. See Figure 5.
C. Using a Philips head screwdriver install two screws to hold the console back in place.
Do not fully tighten at this time. See Figure 25.
D. Using a Philips head screwdriver secure the console back to the upright assembly
using ten screws. Fully tighten the two screws installed in step 7C. See Figure 24.
Service
Page 4-33
Cybex 425T Treadmill Service Manual
21. Route the new contact heart rate cable.
A. Connect the contact heart rate connector into the bottom of the heart rate board. See
Figure 22.
B. Locate the short and long side of the heart rate
Black Wire
(Back)
cable.
C. Route the short cable end to the left (from
treadmill user’s viewpoint) and the long end to
the right.
Red Wire
(Front)
D. Fold the each cable and place it into the hole
that leads to the grip. See Figure 30.
NOTE: Front is from treadmill
E. Push each wire out a hole (red out the front hole
and black out the back hole). See Figure 30.
Figure 30
user’s viewpoint.
22. Secure the new plastic housing.
Small Holes
A. Remove the protective paper from the loose
pieces double-sided tape and stick each one
between two small holes in the handrail. See
Figure 31.
B. Position each set of plastic housing so that
the grooves fit together snugly. NOTE: If the
grooves
don’t fit and the housing gets taped down in the
wrong position pulling it up will destroy the tape.
Figure 31
Do not let the plastic housing touch the doublesided tape until step 7E.
C. Place each plastic grip near the handrail and
pull each wire through a rectangular hole. See
Figure 32. NOTE: Don’t let the wires slip back
into their holes.
D. Fit the three plastic parts in position (the housing
(2) and the cap (1)) and continue holding all
plastic parts through the next step. See Figure
32.
Figure 32
E. While being careful not to overtighten and crack
the housing, place the nuts in their holes and secure them
with the bolts. NOTE: It is easier to place the nuts on the top
and the bolts from the bottom. See Figure 33.
Double-sided
Tape
Cap
Double-sided
Tape
Wire Through
Rectangular
Hole
Nuts
Service
Page 4-34
Bolts
Figure 33
Cybex 425T Treadmill Service Manual
23. Secure the new metal contacts.
A. Remove the protective paper from the four
metal contacts and from the eight strips of
tape on the plastic housing.
B. Locate the small bump on the metal contact
prong and on the connectors. See Figure 34.
Line Up Bumps
Prong on Metal Plate
C. Connect the each cable to a metal prong
with the bumps lined up. See Figure 34.
Figure 34
D. Push the excess wire into its rectangular hole.
E. Press each metal contact into the grooves (one groove at a time) on the plastic
housing. NOTE: They will snap in.
24. Connect the cables removed in step 2D.
A. Confirm that the two cables and one molex placeholder are firmly connected to the
heart rate board in their proper places. See Figure 22.
25. Secure the motor cover.
A. Lower the motor cover center into position. See Figure 3.
B. Using a Phillips head screwdriver, tighten the two screws on each side and the two
screws in the front of the unit.
26. Connect the external power source.
A. Plug the treadmill into the power outlet.
27. Calibrate speed (if you replaced the display board).
A. Follow the Speed Calibration procedure located in this chapter. .
28. Test the unit for proper operation.
A. Connect the treadmill to the power outlet.
B. Operate the unit at all levels to verify proper operation.
Service
Page 4-35
Cybex 425T Treadmill Service Manual
Parts List
ITEM QTY. PART NO. DESCRIPTION
NO.
1 1 AF-18899 Weldment, Console Back Plate
2 1 AL-18596 Front Roller, 2.75 O.D.
3 1 AL-18597 Rear Roller, 2.75 O.D.
6 1 AX-17578 Assembly, Contact Grip, Pair
7 1 AF-18394 Weldment, Elevation
8 1 AX-18729 Assembly, Idler
9 1 AX-19150 Assembly, E-Stop Lanyard
10 1 AX-19239 Assembly, Motor Cover
11 1 BD-18763 Belt, Running
12 1 BD-18917 Belt, Poly-V,320J8
15 2 DE-19360 Decal, Side Labels, Black
15 2 DE-19353 Decal, Side Labels, Silver
17 1 DK-18401 Deck, Running
18 1 EC-18573 Sensor, Speed
19 1 EH-00986 Wire Tie, 9”
20 1 EH-10291 Base, Wire Tie
21 1 FM-18405 Shaft, Elevation
22 4 FS-16511 Plate, Rear Rubber Foot Mounting
23 1 FS-19213 Cable, Connector Plate, 425T
24 1 FT-16825 Sleeve, Elevation Mounting, Top
25 1 FT-16826 Sleeve, Elevation Mounting, Bottom
26 2 HB-16367 Bushing, .50 I.D. x .62 O.D. x .31 LG, Flanged
27 2 HN-10029 Nut, 1/2 - 13 HEX STL ZINC
28 2 HN-17935 Nut Locking, 3/8 - 24, GRD C, STL, ZN
29 2 HS-00156 Screw, 4-40 x .62, PNHD PHIL
30 2 HS-00261 Bolt, 1/2 - 13 x 5.5, HXHD
31 6 HS-15706 Screw, 8-16 x .50, PNHD, STL, BLK ZN CLR, TYP WB
32 10 HS-16509 Screw, SLFTP, 10 x .5, PNHD, PLT, TYP B, PT-S
33 10 HS-16628 Bolt, 1/4 - 20 x 1.5, HXHD, G8
34 6 HS-16929 Bolt, Whiz Lock, 3/8 - 16 x .625, HXHD, G5
35 8 HS-16939 Screw, SEMS,10/32 x .75, PNHD, BLK ZN, EXT
36 1 HS-17936 Bolt, 3/8 - 24 x 2.0, HXHD CAP, G8, YEL ZN
37 1 HS-17937 Bolt, 3/8 - 24 x 2.75, HXHD CAP, G8, YEL ZN
38 4 HS-19108 Screw 5/16-18 x 3/4, HXHD, Whiz-Lock
39 1 HS-41006 Screw, SLFTP, 10/24 x 1.38, PNHD PHIL, SST, BLK, TT
40 2 HS-41107 Bolt, 5/16 - 18 x 1.5, BTHD, SST, BLK
41 2 HW-00165 Washer, Split Lock, 5/16, ZINC
42 8 HW-00180 Washer, Split Lock, 1/4, SST, BLK
43 2 HW-00590 Bushing, Nylon, 1/2
44 12 HW-18123 Washer, .344 I.D. x .75 O.D. x .125 Thick, Black Zinc
45 2 HX-13771 Ring, Retaining, 5/8 x .579 FR. I.D.
46 2 HX-15678 Bushing, Deck, 5/16 - 18
47 1 HX-17711 Plug, Plastic, 7/16, BLACK
48 4 HX-17788 Tape, Double Sided, .032 Thick
49 2 HX-18133 E-Ring, Retaining, 5133-37
50 2 HX-18901 Grips, 425 Upright Handrail
51 1 HX-19052 Idler Spring
52 2 HX-19102 Rubber Foot, Rear
53 1 HX-19384 Coupling, Shaft, DBL Split 5/8
56 1 PL-18773 Plunger, E-Stop
57 1 PL-18929 Cover, Rear, Outer Right
58 1 PL-18930 Cover, Rear, Inner Right
59 1 PL-18932 Cover, Rear, Outer Left
60 1 PL-18933 Cover, Rear, Inner Left
61 1 PL-18990 Cover, Motor, Front, 425T
62 1 PL-18991 Cover, Motor, Right ,425T
63 1 PL-18992 Cover, Motor Left,425T
64 1 PL-19061 Cover, Console, Back Trim, 425T
65 1 PL-19093 Cover, Handle Lower
66 1 PL-19094 Accessory Tray, 425T Console
68 1 SW-18535 Switch, Limit
70 8 HS-11977 Screw, SEMS, 8/32 x .38, PNHD
74 2 CW-16712 Wheel, 3 Dia. x 1.25 W, Plain Bearing
Service
Page 4-36
Cybex 425T Treadmill Service Manual
ITEM QTY. PART NO. DESCRIPTION
NO.
75 4 HB-18768 Bearing, LF-1011-12
76 2 HS-60022 Bolt, 3/8 x 2.25, HXHD CAP, Black Zinc, G5
77 2 HN-60064 Nut, Jam 3/8 - 16, Black Zinc
78 1 AF-18481 Weldment, Motor Base
79 1 AF-18769 Bracket, Heat Sink
80 2 HB-18768 Bearing, LF-1011-12
81 1 AD-18213 PCA, Control Board,115 VAC
81 1 AD-18217 PCA, Control Board, 230 VAC
82 2 EC-18538 Circuit Breaker, 15 Amp, 115 VAC
82 2 EC-18539 Circuit Breaker, 10 Amp, 250 VAC
83 1 EC-18896 Filter, 16 Amp
84 4 HN-11136 KEPS, 5/16 - 18, HEX STL ZINC
85 8 HS-19111 Screw, SEMS, 8/32 x .38, PNHD EXT Black Zinc
86 8 EH-00986 Wire Tie, Nylon, 9
87 2 HN-11925 KEPS, 10-32, HEX STL ZN
88 1 HW-10856 Washer, Lock External, No. 10 ZC
89 2 HS-15732 Screw, SEMS, 8-32 UNC x .62, PNHD PHIL, ZN
90 1 EH-12260 Wire Tie, Nylon, 18
91 1 FS-19355 Plate, Circuit Breaker Mount
92 1 DE-16928 Label, Disconnect Power, Multilingual
93 1 DE-19238 Decal, Warning, Motor Plate
94 1 DE-19198 Decal, Cybex logo
95 1 AF-18728 Bracket, Idler
96 1 HB-19135 Idler Wheel, 1.88 x 1.0
97 2 HB-18056 Bushing, Flange, .375 x .469 x .25
98 1 HS-19338 Screw, 3/8 - 16 x 1.75, SCHD BTN, BLK, ZN
102 1 MR-18402 Motor, Elevation, 115 VAC
102 1 MR-18403 Motor, Elevation, 230 VAC
103 1 MR-18214 Motor, Drive, 115 VAC
103 1 MR-18215 Motor, Drive, 230 VAC
111 1 AF-19194 Weldment, Monitor Bracket, 425T
120 1 EH-19416 Heat Sink, Silpad
121 1 EC-15004 Ferrite, Clamp-on, .40 I.D.
200 1 AX-18765 Assembly, Top Platform, Right
201 1 AX-18764 Assembly, Top Platform, Left
202 1 AF-18486 Weldment, Upright
203 1 AF-18461 Weldment, Frame, 425T
204 1 DE-18766 Decal, Safety Walk
205 8 HS-15706 Screw, 8-16 x .50, PNHD, STL, BLK ZN CLR, TYP WB
206 1 PL-18931 Cover, Rear, Top Left
207 1 PL-19120 Cover, Rear, Bottom Left
208 1 PL-18928 Cover, Rear, Top Right
209 1 PL-19118 Cover, Rear, Bottom Right
210 1 DE-19441 Decal, 425T, Black
210 1 DE-19442 Decal, 425T, Silver 877
211 1 HX-18287 Plug, Hole, Plastic, 1”, Black
300 1 AX-18545 Assembly, 425T Console
301 1 AX-19356 Assembly, Cover, Top CHR
304 1 AD-18207 PCA, Display, 425T
305 1 AF-19187 Bracket, Console Anchor, Right
306 1 AF-19188 Bracket, Console Anchor, Left
308 1 DE-18556-4 Decal, Warning, Right
309 1 DE-18557-4 Decal, Warning, Left
310 1 EC-17877 Sensor, Polar Wireless Remote Mount
311 4 HS-15706 Screw, 8-16 x .50, PNHD, STL, BLK ZN CLR, TYP WB
312 7 HS-41187 Screw, SLFTP, 8-16 x .3125, Plastite
313 1 HX-17788 Tape, Double Sided, .032 Thick
314 2 PL-17686 Tab, Book Holder
315 1 PL-18548 Console, Plastic, 425T
316 1 SW-18520-4 Membrane, 425T, Top, English
317 1 SW-18523-4 Membrane, 425T, Bottom, English
318 1 DE-19189-4 Label, Warning
402 1 AX-19193-4 Assembly, TV Support
403 1 FS-19190 Controller Mount
404 1 HS-19369 Screw, 1/4-20 x 1.25”, PHL, PAN, BLK ZINC
405 1 HW-00180 Washer, Split Lock 1/4”
Service
Page 4-37
Cybex 425T Treadmill Service Manual
ITEM QTY. PART NO. DESCRIPTION
NO.
406 1 HS-41006 Screw, 10-24 x 1/2”, RECESS, PAN HD, TT, SS
407 1 HS-11977 Screw, SEMS, 8-32 x .38”, PNHD PHIL, EXT, STL, BLK ZN
NS 1 AF-19068 Bracket, Power Factor
NS 1 AW-19117 Cable, A/V Option
NS 1 AW-18216 Cable, Harness, Console
NS 1 AW-18256 Cable, Polar Jumper
NS 1 AW-18528 Cable, Harness, Frame
NS 1 AW-18530 Cable, Filter to Board, Hot, Black
NS 1 AW-18531 Cable, Filter to Board, Neutral, White
NS 1 AW-18532 Power Cord, 115 VAC
NS 1 AW-18533 Power Cord, 230 VAC
NS 1 AW-18534 Power Cord, 230 VAC, 50 Hz
NS 1 AW-19525 Power Cord, 230 VAC, UK
NS 1 AW-18540 Cable, Circuit Breaker to Filter, Hot, Black
NS 1 AW-18541 Cable, Circuit Breaker to Filter, Neutral, White
NS 1 AW-18574 Cable, Speed Signal
NS 1 AW-18972 Cable, Elevation Motor
NS 1 AW-19221 Cable, Contact Heart Rate Grip and Ground
NS 1 AW-19235 Cable, Control Board, Ground
NS 1 AX-19193 Controller Mount
NS 1 AX-19354 Kit, Install Hardware
NS 1 DE-18413 Decal, ETL
NS 1 CN-17687 Adapter, 1/4 Plug to 1/8 Jack
NS 4 EH-10291 Wire Tie, Base
NS 1 EH-19220 Jacket, Corrugated Tubing, 27 Long
NS 1 FS-17698 Clamp, Headphone Adapter
NS 1 FS-19190 Controller Mount
NS 1 FS-18771 Cover, Lower, Motor Controller
NS 4 HS-19108 Screw, 5/16-18 x 3/4, LG HXHD, Whiz Lock, GR5
NS 2 HS-19369 Screw, 1/4 - 20 x 1.25, PNHD PHIL, Black Zinc
NS 1 HX-19059 Plug, Tube End, 1.5 O.D.
NS 1 LT-03051 Sign Facility Safety
NS 1 LT-19339 Warranty Sheet, 425T
NS 1 LT-19340 Poster, Installation
NS 1 LT-19431-4 Owner’s Manual, 425T
NS 1 SK-18553 Kit Brush, McMillan 3.0HP 110V
NS 1 SK-18554 Kit Brush, McMillan 3.0HP 220V
NS 2 TR-19201 Choke
NOTE: NS = Not Shown
Service
Page 4-38
Optional
Monitor
Bracket
Console
Assembly
300
Console
Assembly
304
315
316
Upright
Assembly
301
48
318
56
65
202
31
68
29
31
402
404
405
403
406
66
47
39
6
50
Not Shown
Wire Tie and Base
19
20
407
50
76
35
201
74
31
38
211
61
28
77
35
102
75
28
35
7
35
35
204
24
1
70
Upright
Assembly
63
210
36
37
25
203
53
64
34
21
70
10
38
44
39
205
42
206
207
205
40
33
23
46
41
34
94
49
15
32
Drive Motor
Assembly
51
52
70
312
9
11
310
311
312
313
305
306
317
314
309
308
Idler Pulley
Assembly
33
42
46
62
17
35
210
2
43
34
12
45
27
34
34
18
8
Serial
Number
52
22
38
22
32
59
32
60
32
28
28
58
200
27
15
43
57
204
208
205
45
205
26
3
30
32
209
Drive Motor
Assembly
70
80
84
97
90
91
78
82
103
80
120
86
121
86
95
88
98
89
87
83
97
87
96
70
81
79
70
86
93
92
70
Cybex 425T Treadmill Service Manual Page 4-39
S
N
HX-18537
MAGNET, ROLLER SHEAVE
FERRITE, CLAMP-ON
AC POWER
CONVERTER
WR-14012 (Ger. Sp. Swe.)
CABLE, POWER CORD, 230V,
10A, CEE 7-7,2M
AW-20192
POWER CORD, JAPAN,
2.4M IEC-320
AW-20193
POWER CORD, 250VAC,
3A, 2.5M IEC-320, UK
HA-20175
HEADPHONES
EC-18573
SENSOR, 425T SPEED
CABLE, SPEED EXT
EC-15004
( + )
MR-18214
MOTOR, 3.0Hp PMDC,110V
MR-18215
MOTOR, 3.0Hp PMDC,220V
AW-19117
CABLE, 610ARC A-V I-O
CN-17687
ADAPTER, 1/4"-1/8"
GND
1
2
AW-18574
CABLE, ELEVATION MOTOR, 425T
AW-19235
WIRE, CONTROLLER GROUND
1
2
RED
BLK
( - )
A/V MONITOR
CP-19879
1
2
2
AW-17694
CABLE, AUDIO 1/4"
113223
AW-18972
P2
1
AD-18213
CONTROLLER, 425T 110V
AD-18217
CONTROLLER, 425T 230V
A1
A2
DIAGNOSTIC LEDS
DT1 UP
DT13 DOWN
DT16 SPEED
DT9 MOTOR
AW-20111 CABLE,
5E BONDED-PAIR RJ45
TO J9 ON AD-18207
PCA, 425T
GROUND
GROUND
TO J6 ON AD-18207
PCA, 425T
113223
GREEN
DT15 VAC
DT5 +9V
ARM VOLT
DT6 PWM
ILT2-15V
LEFT
LEFT FRONT SIGNAL
LEFT REAR SIGNAL
BLACK
RED
ELEV UP
ELEV DOWN
ELEV ZERO SW
ORANGE
BLACK
CABLE,425T GRIP & GND
WHITE
ELEV COMMON
ZERO SW
AC2 NEUTRAL
ELEV UP
+9V UNREG
ELEV DOWN
BELT RELAY
AW-19221
BLACK
RED
GREEN
WHITE
BLACK
RED
P1
3
GND
2
1
AC1 HOT
5
6
7
8
1
2
3
GND
4
GND
4
PWM
5
N/C
6
GND
1
N/C
2
N/C
3
RPM
CABLE, 425T FRAME HARNESS
RED
BROWN
44
1
5
2
636
3
BLACK
3
2
1
AW-18530
WIRE, FILTER TO BOARD, HOT
AW-18531
WIRE, FILTER TO BOARD, NEUTRAL
P3 J1
5
WHITE
6
8
2
4
RED
7
YELLOW
1
ORANGE
BLUE
3
GREEN
GRAY
P4
4
BROWN
5
6
BLACK
1
2
3
VIOLET
AW-18528
RIGHT
RIGHT FRONT SIGNAL
RIGHT REAR SIGNAL
6
BLACK
5
ORANGE
BROWN
RED
1234
1
5
2
RED
BLACK
WHITE
1
2
3
4
5
6
7
8
9
10
AD-18207
PCA, 425T 4-LAYER DISPLAY BOARD
EC-18208
CODE, 425T SOFTWARE
CHASSIS
SHIELD
J1
LEFT COMMON
LEFT SIGNAL
SHIELD
J2
RIGHT COMMON
RIGHT SIGNAL
ZERO
POSITION
SWITCH
NORMALLY CLOSED
OPEN <=10.24"
P1
1
2
3
4
5
6
7
98
10
CABLE, 425T CONSOLE HARNESS
EC-18896
FILTER, 15A LINE
LINE
FILTER
DSC1000-4-10-4.7
WHITE
RED
YELLOW
ORANGE
BLUE
GREEN
GRAY
BROWN
BLACK
VIOLET
AW-18216
LEFT SIGNAL
LEFT COMMON
RIGHT COMMON
RIGHT SIGNAL
SHIELD
SHIELD
J3 J4
ELV-MOTOR
2ND GRIP
MR-18402
GEARMOTOR, 110V
MR-18403
GND
THERMAL
COM
UP
DWN
GEARMOTOR, 220V
TOP SAFETY SW
NORMALLY CLOSED
OPEN >= 15.65"
1 CD CARRIER DETECT
2 RD RECEIVE DATA
3 TD TRANSMIT DATA
4 DTR DATA TERMINAL READY
5 GND
6 DSR DATA SET READY
7 RTS REQUEST TO SEND
8 CTS CLEAR TO SEND
9 RI RING DETECT
ADAPTER, SERVICE PROGRAMMING
CN-16924
345
7
62189
GRAY
BROWN
YELLOW
GREEN
RED
BLACK
ORANGE
BLUE
J102
CHASSIS
8
GND
7
6
N/C
5
B+
4
TXD
3
RXD
2
N/C
1
CSAFE CONNECTOR
N/C
200-250VAC 50Hz PFC CHOKE
BLACK
N
TR-19201
AW-18540
WIRE, CB TO FILTER, HOT
NON-CE JUMPER ONLY
AW-18541
WIRE, CB TO FILTER, NEUT
BLACK
EC-18538
CIRCUIT BREAKER, 15A/115V
EC-18539
CIRCUIT BREAKER, 10A / 250V
GND
AW-18532
POWER CORD, 115V
AW-18533
POWER CORD, 220V
AW-18534
POWER CORD, 230V
AW-19525
POWER CORD, UK 13A/230V 50HZ
RED
RED
SW-18535
SWITCH, 425T MICRO, NO
SW1
SW3
YELLOW
YELLOW
AW-18256
CABLE, EMBEDDED POLAR
BLACK
RED
GREEN
P6
J6
3
1
4
2
3
1
4
2
GND
+9V UNREG
GND
+5
J8
SIG
5
5
J6
GND
8
769
7
PWM
+9V UNREG
N/C
CHASSIS
GND
6
7
8
10
8
106
9
GND
RPM
RELAY PWR
B+
RXD
RIGHT
LEFT
TXD
2
4
1
3
5
EXTERNAL ACCESS
4
3
3
ELEV DOWN
RIGHT
1
ZERO SWITCH
GND
6
P7
5
4
6
5
J10
BELT RELAY
2
1
2
1
ELEV UP
LEFT
2
3
J9
AUDIO STD CSAFE
JACK
1
1
POLAR
GND
2
3
2
3
SIG
VCC
J1
J4
J3
1 32
SW-18520
MEMBRANE, 425T TOP
SW-18522
MEMBRANE, 425T BOTTOM W/AV
SW-18523
MEMBRANE, 425T BOTTOM W/O AV
GND
VCC
SIG
EC-17877
SENSOR, EMBEDDED POLAR
Page 4-40 Cybex 425T Treadmill Service Manual
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