CYBEX LCX-425T Service Manual
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CYBEX LCX-425T Service Manual

Cardiovascular systems
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See also: Owner's Manual
Cybex LCX-425T Treadmill
Service Manual
Cardiovascular Systems
Part Number LT-19638 Rev C
www.cybexinternational.com

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Summary of Contents for CYBEX LCX-425T

  • Page 1 Cybex LCX-425T Treadmill Service Manual Cardiovascular Systems Part Number LT-19638 Rev C www.cybexinternational.com...

  • Page 3: Service Manual

    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.

  • Page 5: About This Manual

    • 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...

  • Page 6: Declaration Of Conformity

    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.” Manufacturer: EU Representative: Cybex International, Inc. Cybex International UK 10 Trotter Drive...
  • Page 7 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 CAN/CSA-C22.2 No.68-92/99, UL Std. No. 1647, FCC Part 15...
  • Page 8 Cybex 425T Treadmill Service Manual EN 61000-3-2 Electromagnetic compatibility (EMC) - Part 3-2: Limits - Limits for harmonic current emis- sions (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 <=...

  • Page 9: Table Of Contents

    Cybex 425T Treadmill Service Manual Table of Contents Front Pages Service About this Manual ....i Warnings/Cautions ....4-1 FCC Compliance Information.
  • Page 10 Cybex 425T Treadmill Service Manual This page intentionally left blank Page vi...

  • Page 11: Safety

    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.

  • Page 12: Important Safety Instructions

    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...
  • Page 13 • 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.

  • Page 14: Warning Decals

    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.
  • Page 15 Cybex 425T Treadmill Service Manual DE-19238 Warning Motor Cover Safety Page 1-5...
  • Page 16 Cybex 425T Treadmill Service Manual DE-16928 Warning Motor Cover Safety Page 1-6...

  • Page 17: Caution Decals

    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.
  • Page 18 Cybex 425T Treadmill Service Manual This page intentionally left blank Safety Page 1-8...

  • Page 19: Preventive Maintenance

    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.
  • Page 20 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.

  • Page 21: Running Belt Maintenance

    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.
  • Page 22 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.

  • Page 23: Other Preventive Maintenance

    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 •...

  • Page 24: Service Schedule

    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.
  • Page 25 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.
  • Page 26 Cybex 425T Treadmill Service Manual This page intentionally left blank Preventive Maintenance Page 2-8...

  • Page 27: Customer 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.

  • Page 28: Return Material Authorization (Rma)

    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.

  • Page 29: Ordering Parts

    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.
  • Page 30 Cybex 425T Treadmill Service Manual Customer Service Page 3-4...

  • Page 31: Service

    ! 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.

  • Page 32: Test Mode

    Cool Down Mets manual HR Control Level programs Enter Incline Down control Speed - Cybex International, Inc. Medway, MA USA (508) 533-4300 www.CybexInternational.com Wireless HR Receiver Inside Channel - (opt.) Time Programs Arrow Up Lower Arrow Down Overlay Inline Up...

  • Page 33: Led Functions

    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. control Cybex International, Inc. Medway, MA USA (508) 533-4300 www.CybexInternational.com Wireless HR Receiver Inside Heart Rate...

  • Page 34: Error Codes

    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.

  • Page 35: Speed Sensor Adjustment

    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.

  • Page 36: Speed Calibration

    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.

  • Page 37: Running Belt And Deck

    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.

  • Page 38: End Caps

    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 Bottom 5. Remove the end caps. Caps A. Using a Phillips head screwdriver, remove the two...

  • Page 39: Rear Roller

    Cybex 425T Treadmill Service Manual Rear Roller Bolt Bronze Tools Required Rear Bushing Running Belt Roller • 3/4” socket wrench • 7/16” socket wrench • 3/16” allen wrench 7. Remove the rear roller. Retaining Ring A. Using a 3/4” socket wrench,...

  • Page 40: Front Roller

    Cybex 425T Treadmill Service Manual Front Roller 9. Remove the front roller. Idler ! WARNING: Drive belt is under tension. Do not pinch fingers while releasing tension. Tools Required • 3/4” socket wrench • 7/16” socket wrench Square A. Release drive belt tension by placing a Phillips...
  • Page 41 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.

  • Page 42: Motor Brushes 110 Vac

    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.
  • Page 43 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.
  • Page 44 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.
  • Page 45 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.

  • Page 46: Motor Brushes 220 Vac

    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.
  • Page 47 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.

  • Page 48: Drive Motor

    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.
  • Page 49 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. Motor Plate 5. Disconnect the motor cables. Bolts and Washers A.

  • Page 50: Lower Control Board

    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.
  • Page 51 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.

  • Page 52: Power Cord

    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);...

  • Page 53: Circuit Breakers

    D. Connect the white fast-on connectors from the power cord to the circuit breaker with the white wire. See Figure 18. Line Circuit Filter Breakers Ground Wire Stud AC Line 2 Lower (AC2) Board Power Cord AC Line 1 (AC1) Strain Relief Figure 18...

  • Page 54: Line Filter

    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).
  • Page 55 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.

  • Page 56: Elevation Motor

    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.
  • Page 57 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.

  • Page 58: Upper Display Board

    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.

  • Page 59: Display Overlays

    Cybex 425T Treadmill Service Manual Mounting Screws (5) Polar Heart Rate Cable Display Cable (2 Connectors) Ground Contact Wire 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.

  • Page 60: Contact Heart Rate Grips

    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.

  • Page 61: E-Stop Switch

    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 Upright Screws securing the console Assembly back from the upright assembly.

  • Page 62: Display Cable

    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. Lower E-Stop Upper Handle Switch Handle...
  • Page 63 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.
  • Page 64 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. Black Wire B. Locate the short and long side of the heart rate (Back) cable.
  • Page 65 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 Line Up Bumps prong and on the connectors.

  • Page 66: Parts List

    Cybex 425T Treadmill Service Manual Parts List ITEM QTY. PART NO. DESCRIPTION AF-18899 Weldment, Console Back Plate AL-18596 Front Roller, 2.75 O.D. AL-18597 Rear Roller, 2.75 O.D. AX-17578 Assembly, Contact Grip, Pair AF-18394 Weldment, Elevation AX-18729 Assembly, Idler AX-19150 Assembly, E-Stop Lanyard...
  • Page 67 Cybex 425T Treadmill Service Manual ITEM QTY. PART NO. DESCRIPTION HB-18768 Bearing, LF-1011-12 HS-60022 Bolt, 3/8 x 2.25, HXHD CAP, Black Zinc, G5 HN-60064 Nut, Jam 3/8 - 16, Black Zinc AF-18481 Weldment, Motor Base AF-18769 Bracket, Heat Sink HB-18768...
  • Page 68 Cybex 425T Treadmill Service Manual ITEM QTY. PART NO. DESCRIPTION HS-41006 Screw, 10-24 x 1/2”, RECESS, PAN HD, TT, SS HS-11977 Screw, SEMS, 8-32 x .38”, PNHD PHIL, EXT, STL, BLK ZN AF-19068 Bracket, Power Factor AW-19117 Cable, A/V Option...
  • Page 69 Optional Console Monitor Assembly Bracket Console Assembly Idler Pulley Upright Assembly Upright Assembly Assembly Drive Motor Assembly Serial Number Not Shown Wire Tie and Base Drive Motor 87 70 Assembly 80 86 Cybex 425T Treadmill Service Manual Page 4-39...
  • Page 70 ORANGE SHIELD LEFT COMMON LEFT SIGNAL AW-19221 SHIELD HA-20175 RIGHT COMMON CABLE,425T GRIP & GND RIGHT SIGNAL 2ND GRIP HEADPHONES BROWN TO J9 ON AD-18207 PCA, 425T STD CSAFE AUDIO EXTERNAL ACCESS JACK Page 4-40 Cybex 425T Treadmill Service Manual...

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