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Cybex 425T Treadmill Service Manual

Figure 1

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.

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

Summary of Contents for LCX-425T

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

Page 2: ......

Page 3: ...s 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...

Page 4: ......

Page 5: ...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...

Page 6: ...ngdom 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 in...

Page 7: ...esting 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 El...

Page 8: ...ment 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 Clas...

Page 9: ...3 1 Return Material Authorization RMA 3 2 Damaged Parts 3 2 Ordering Parts 3 3 Cybex 425T Treadmill Service Manual Page v Table of Contents 4 Service Warnings Cautions 4 1 Test Mode 4 2 LED Functions...

Page 10: ...Page vi This page intentionally left blank Cybex 425T Treadmill Service Manual...

Page 11: ...ce 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 ins...

Page 12: ...ency 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 th...

Page 13: ...ed 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...

Page 14: ...ed 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 leve...

Page 15: ...Cybex 425T Treadmill Service Manual DE 19238 DE 19238 Warning Motor Cover Safety Page 1 5...

Page 16: ...Cybex 425T Treadmill Service Manual Safety Page 1 6 DE 16928 Warning Motor Cover...

Page 17: ...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 carefull...

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

Page 19: ...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...

Page 20: ...h 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 t...

Page 21: ...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...

Page 22: ...t 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...

Page 23: ...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 experien...

Page 24: ...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 t...

Page 25: ...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 50...

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

Page 27: ...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 volta...

Page 28: ...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 lab...

Page 29: ...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...

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

Page 31: ...oper 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...

Page 32: ...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 cl...

Page 33: ...e 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...

Page 34: ...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 S...

Page 35: ...ee 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 t...

Page 36: ...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...

Page 37: ...lly 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...

Page 38: ...ee Figure 7 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 s...

Page 39: ...g 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 Fig...

Page 40: ...1 NOTE The right bolt will stay on the front roller You do not need to remove it for this procedure D Using a 9 16 socket wrench loosen the left front roller bolt See Figure 11 E Remove the front roll...

Page 41: ...6 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 dec...

Page 42: ...sh 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...

Page 43: ...n 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...

Page 44: ...f 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 mo...

Page 45: ...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...

Page 46: ...ve 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...

Page 47: ...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 moto...

Page 48: ...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...

Page 49: ...d touching lower board components such as resistors and capacitors 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...

Page 50: ...apter 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...

Page 51: ...ld 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...

Page 52: ...s 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...

Page 53: ...her 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 mo...

Page 54: ...ld 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 Conne...

Page 55: ...e 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...

Page 56: ...eadmill 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 U...

Page 57: ...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 scr...

Page 58: ...t you are working on Wear an ESD strap for the rest of this procedure 2 Remove the console assembly from the handrail A Using a Philips head screwdriver remove the two screws securing the back cover t...

Page 59: ...alibration 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 raz...

Page 60: ...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 careful...

Page 61: ...sole back from the upright assembly See Figure 24 B Using a Philips head screwdriver remove the two screws that secure the console backin place See Figure 25 Figure 25 Console Back Screws Screws Uprig...

Page 62: ...d 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 pl...

Page 63: ...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...

Page 64: ...t 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 Do not let the plastic housing touch the doubl...

Page 65: ...bles 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...

Page 66: ...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...

Page 67: ...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 Assem...

Page 68: ...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 1...

Page 69: ...5 35 35 34 35 63 35 201 206 204 15 32 37 36 25 28 102 28 77 74 76 38 7 53 21 38 52 22 32 32 59 60 28 52 22 32 28 58 57 32 38 3 30 26 27 43 45 27 45 43 12 2 34 62 35 34 66 301 65 56 39 6 50 50 31 68 29...

Page 70: ...FILTER NEUT WIRE CB TO FILTER HOT 200 250VAC 50Hz PFC CHOKE AW 18540 AW 18530 FILTER 15A LINE DSC1000 4 10 4 7 YELLOW WHITE FILTER WHITE YELLOW RED P3 J1 RED P1 WIRE FILTER TO BOARD NEUTRAL WIRE FILT...

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