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Service Manual, C944 Treadmill.fm

1. Continue with the next step Skip to Step 11 Removing the Zero Sense Switch 9 Carefully remove the blue wires from the zero sense switch 10 Remove the two screws and washers that secure the limit switch to the switch bracket see Diagram 4 2 Diagram 6 2 Limit Switch Wiring Diagram To Lift Cap To J3 Black Term 3 To J2 Term 3 To J2 Term 6 To J3 Red Term 1 To Lift Cap Page 31 C944 Treadmill 11 If you are removing the actuator shaft or switch bracket THEN OTHERWISE Continue with the next step Skip to Step 26 Removing the Actuator Shaft and Switch Actuator 12 Remove the screw that secures the switch actuator to the actuator shaft Set aside the screw and switch actuator 13 Remove the shoulder screw that connects the actuator shaft and actuator block to the lift platform See Diagram 6 3 Note If necessary hold the actuator shaft with the pliers and support the actuator block firmly with your hand when you perform Step 14 14 Unscrew the actuator shaft from the actuator block Set aside the actuator block 15 Slide the actuator shaft from the switch bracket 16 If you are removing the switch bracket THEN OTHERWISE Continue with the next step Skip to Step 20 Removing and Replacing the Switch Bracket 17 Remove the socket head screws and washers that secure the switch bracket to the lift motor platform Set aside the switch bracket 18 Position the switch b
2. Pin 3 of J3 ENTER 0 Vdc and 500 mVdc Pin 4 of J3 INCLINE DOWN 0 Vdc and 500 mVdc Pin 5 of J3 INCLINE UP 0 Vdc and 500 mVdc Pin 7 of J3 STOP 0 Vdc and 500 mVdc Pin 8 of J3 SPEED DOWN 0 Vdc and 500 mVdc Pin 9 of J3 SPEED UP 0 Vdc and 500 mVdc Pin 10 of J3 QUICK START 0 Vdc and 500 mVdc If the voltage readings match those listed in Tables 5 1 and 5 2 and one or more keys do not function replace the upper PCA If the voltage readings in Table 5 1 are incorrect disconnect the keypad cable from the key pad connector and repeat the voltage measuremnts in 5 1 If the voltage readings are now correct replace the display housing keypad If the voltage readings are still incorrect replace the upper PCA If the voltage readings in Table 5 1 are correct and one or more voltage readings in Table 5 2 are incorrect replace the display housing keypad Set the circuit breaker in the off position If necessary carefully re connect the keypad cable to the keypad connector Remove the ground lead of the wrist strap from the treadmill frame then remove the wrist strap from your arm Position the display enclosure on the display plate Install the screws that secure the display enclosure to the display plate Check the operation of the treadmill as described in Section Three of this appendix Page 19 C944 Treadmill Procedure 5 2 Troubleshooting the Lift System Lift System Description The lift system on these units consist
3. Ribbon Cable Cd Ferite Bead Page 41 C944 Treadmill Block Diagram 7 4 C944 SCR 240 Vac z euiuwe JEUILUIA YOS 104 Jas aq jsnw Ya siedwni zan Lan oui syod Jeddn Jeybiy 10 GQL YUM S p965 8 S Z96D YO L 9JON yg 30A 081 y O O ay ltae Josuas YE peeds M IPAG MOIIBA 2510 y an yo pay zo 5 18 umoq HIT uaa lHo esuas oz 38 uonduoasaq Jojo Bisag Jos ss g sapolq Gunywa 3y61 vout LoneYOY M ya Wa 0 a OWA Puf soMoO Ove M _t_ _ 0 0 a a put eddn a ejqev uogqar pesn jou az punog Se tZ pasn jou OZ 8L tonsod yn Li din 4syes ob exes axl si ki aoz Si jonuo5 jonuog l0o uoo 104 u00 S D1 Vi EFzart pasn jou Zz paeds pseds p aeMyos oL pa di z Zaf wee a it o1 Wo1j Wolo WOU Bos TT os lo405 YOS 6 Josuas paadg 8 ear ka 1p9jap s0 JO DJEZ po WMd edt uopdiiasag uld yos ti a sat s t Laf Ki suonJEUUOJ ajqej UOqqy mupeosy YOS Obz PI6I Obz Z96I OvZ br6J Page 42 C944 Treadmill Wiring Diagram 7 5 C944 PWM 120 Vac White White Rotation Sensor SEn A s Limit Switch Lift Capacitor ned Red Lift Moter Zero Sense Switch Black Ho Blue Blue Down Limit Switch a9 Black Black Black o o F Transformer Black 1 3 jon lan Brown F1 Lift Fuse 2A Slow Blow 6 Red Black E 3 m TI T 7 ACI pog amog Red Speed Sensor 1 2 i P5 an Slow Blow Black hl h Lowe
4. The system knows how far the lift travels per revolution and by counting revolutions hall effect sensor pulses knows the current lift position The other two position switches upper and lower limit do not come into play during normal operation If either switch is activated it means that the lift has moved beyond it s normal range of motion When either limit switch is activated power is removed from the lift motor Removing power from the lift motor protects the lift system from physical damage Note All resistance measurements must be performed with power removed from the treadmill Performing resistance measurements with voltage applied may damage your ohmmeter Procedure 1 If the lift motor operates but creates a lift error error 40 41 or 43 go to step 8 If the lift motor will not move continue with step 2 2 Put the treadmill in a condition in which the lift motor is ready to be operated for example quick start into the manual program Using an AC voltmeter monitor the voltage across the lift capacitor and press one of the incline keys Approximately 1 4 times the AC input voltage should appear on the lift capacitor when an incline key is pressed Approximately 170 Vac on a 120 Vac unit or approximately 340 Vac on a 240 Vac unit The actual lift capacitor voltage will vary with the AC input voltage If AC line voltage or 1 4 times line voltage is on the lift capacitor go to step 6 If no AC voltage is on the lift capacitor
5. continue with step 3 Page 20 C944 Treadmill Set the treadmill circuit breaker in the off position Remove the 2 amp lift fuse F2 from the lower PCA Using an ohmmeter measure the fuse resistance The fuse should measure approximately 1 or less If the fuse is open vo or significantly higher than 1Q replace the fuse If the fuse was bad perform the test in step 4 before applying power to the lift If the fuse was good continue with step 5 Using an ohmmeter measure the resistance across the lift capacitor terminals The Lower PCA resistance should be extremely high megohms the capacitor resistance should be extremely high megohms and the lift motor winding should read approximately 340 120 Vac units or 122Q 240 Vac units Therefore if the measurement is significantly lower than 340 or 1220 disconnect both red leads from the lift capacitor Measure the resistance between the black leads on the lift capacitor and red lead to the lower PCA If it measures significantly low replace the lower PCA Measure the resistance between the black leads on the lift capacitor and red lead to the lift motor If it measures significantly low replace the lift motor Measure the resistance between the black leads on the lift capacitor and other terminal of the lift capacitor If it measures significantly low replace the lift capacitor At this point the lift fuse is good but there is no AC voltage on the lift capacitor when the lift is
6. E D matrix use the SPEED or INCLINE keys to designate a workout time limit Press ENTER when the desired time appears Page 10 C944 Treadmill Procedure 2 4 Documenting Software Problems When a problem is found with either the software or upper or lower PCA s record the information listed below If you isolated the problem to either the PROM upper PCA or lower PCA include the information you recorded with the malfunctioning PROM or PCA when you ship it to Precor When a problem occurs record the following information Model and serial number Software version number Note Determine the version number of the PROM as described in Procedure 2 1 or by looking at the label on the PROM e User and program number running when the problem occurred e A description of a What happened or failed to happen b The action taken by the user just before the problem occurred c Problem related information such as how far into the program the problem occurred the work level being used when the problem occurred etc e The frequency of occurrence Page 11 C944 Treadmill Section Three Checking Treadmill Operation This section provides you with a quick method of checking treadmill operation Check treadmill operation at the end of a maintenance procedure and when it is necessary to ensure that the treadmill is operating properly Procedure 4 Plug the power cord into the wall outlet then turn on the treadmill with
7. appears 4 Watch the number displayed in the left display window while you press the SPEED a key five or six times Note If the treadmill is using United States standard units the numbers in the left display window are repeatable multiples of 5 such as 160 165 170 175 etc Otherwise the treadmill is using metric units Page 9 C944 Treadmill Changing the Measurement Standard 5 With the PRECOR C944 banner scrolling press the SPEED A and QUICK START CHANGE keys simultaneously or keys RESET 5 6 5 1 5 6 5 sequentially on units with standard access codes A message indicating the last selected units either U S STANDARD UNITS or METRIC UNITS scrolls across the display 6 Use the SPEED or INCLINE keys to select the alternate measurement standard Note Holding the INCLINE UP and CHANGE keys at the banner may cause the last selected units to change if the INCLINE UP key is released before the CHANGE key Selecting Maximum Workout Speed For PWM treadmills the maximum workout speed limit is between either 1 and 12 MPH or 1 and 20 KPH Maximum workout speed limits for SCR C944 treadmills range between 1 and 10 MPH or 1 and 16 KPH 7 With the last currently selected maximum speed displayed on the L E D matrix use the SPEED or INCLINE keys to designate a workout speed limit Press ENTER when the desired speed appears Selecting Maximum Workout Time 8 With the last currently selected maximum time displayed on the L
8. its associated procedure Currently we are using two styles of IC software packages they are a 28 pin dual in line package DIP28 and a forty four pin square package PLCC44 Each of these packages should be removed with a r IC removal tool see the illustrations below PLCC44 removal tool DIP28 removal tool The IC s may inserted into their socket by hand by carefully aligning the notch on the IC with the notch on the IC socket and carefully pressing the IC into its socket See the illustrations below for the alignment notches Care must be taken that the IC legs on a DIP28 are all aligned in the socket to prevent the legs from bending when inserted The PLCC44 IC must be carefully aligned squarely in its socket or it will not insert Do not force the IC into its socket If it does not insert easily remove the it and re align it in its socket iii A CSX V1 02 LWR a B Q 32 00 SC PCA Page 38 C944 Treadmill Wiring Diagram 7 1 C944 SCR 120 Vac White White Rotation Sensor po ea Up Limit Switch Lift Capacitor Red d Red Re Zero Serse Switch Black Oh Blue Blue Down Limit Switch we Black s Black Black O Ha n Lift Motor Circut Breaker Transformer 1 Black J4 Lower PCA Terminal Block rian Blue Blue i SSA Power Cord 5 Red f Black 6 Brown T Red Black 1 Red 1 Pa White Back l Speed Sensor F2 System Fuse SA Gow Blow Ribbon Cable Fe
9. of the wheel on the zero sense switch is above the widest point of the switch actuator THEN OTHERWISE Move the switch bracket down until Move the switch bracket up until the the widest part of the actuator is widest part of the actuator is centered centered on the wheel on the zero on the wheel on the zero sense switch sense switch then continue with then continue with the next step the next step 14 Tighten the socket head bolts and washers that secure the switch bracket to the lift platform see Diagram 4 2 15 Replace the hood 16 Check the operation of the treadmill as described in Section Three of this appendix IMPORTANT If the electronic console displays the diagnostic message LIFT ERROR PRESS STOP when you incline and decline the running bed to its maximum limits repeat this procedure If readjusting the position of the switch actuator does not fix the problem refer to Procedure 2 4 in this appendix Page 17 C944 Treadmill Procedure 5 1 Troubleshooting the Keypad and Upper PCA If the function keys on the electronic console are unresponsive the problem may be either the upper PCA or keypad This troubleshooting procedure gives you the information you need to determine which of these components is malfunctioning Procedure 1 Set the circuit breaker in the off position WARNING Before continuing with this procedure review the Warning and Caution statements listed in Section One of the Resid
10. right dot 13 If the left display window column illuminates appropriately as each key is pressed THEN OTHERWISE The keypad test passed successfully Troubleshoot the upper PCA and continue with the next step keypad as described in Procedure 5 1 of this appendix 14 End the keypad test by pressing the INCLINE v and SPEED a keys simultaneously Page 7 C944 Treadmill Procedure 2 2 Displaying the Treadmill Odometer This procedure displays total distance in miles or kilometers the treadmill has operated The odometer cannot be reset Note The odometers get updated at the end of the course If a user shuts off the unit while in the middle of a course the odometer will not be updated and the user will have essentially lost the mileage for that session Pressing RESET displays the PRECOR C944 banner and accumulates the mileage Procedure 1 Plug the power cord into the wall outlet then turn on the treadmill with the circuit breaker 2 With the PRECOR C944 banner scrolling press the INCLINE a and SPEED A keys simultaneously or keys RESET 6 5 sequentially on units with standard access codes Note The right display window displays total miles or kilometers on the treadmill see Diagram 2 2 The top display window shows the most significant bits of the number the lower display window shows the least significant bits of the number The number displayed is 102 187 723 in miles or kilometers 3 Press ENTER
11. switch THEN OTHERWISE Continue with the next step to Skip to Step 38 to replace the down limit switch or skip to Step 35 to replace the zero sense switch Replacing the Down Lift Limit Switch 31 32 33 34 Position the limit switch at its mounting location Replace the screws and washers that secure the limit switch to the switch bracket Connect the black wires disconnected in Step 6 to the limit switch terminals If you are replacing the zero sense switch Page 33 C944 Treadmill THEN OTHERWISE Continue with the next step Skip to Step 38 Replacing the Zero Sense Switch 35 36 37 38 39 Position the limit switch at its mounting location Replace the screws and washers that secure the limit switch to the switch bracket Connect the blue wires disconnected in Step 9 to the switch terminals Calibrate the lift assembly as described in Procedure 4 1 of this appendix Check the operation of the treadmill as described in Section Three of this appendix Page 34 C944 Treadmill Procedure 6 3 Replacing the Lift Motor Capacitor WARNING Always turn off the circuit breaker and unplug the treadmill before you remove the treadmill hood Removing the Lift Motor Capacitor 1 Remove the hood 2 Remove the black and red wires from the lift motor capacitor terminals 3 Loosen the screw and nut on the capacitor mounting bracket Note If you are servicing a 240 volt C9
12. the circuit breaker 5 Place the treadmill in Manual Mode Adjust the speed of the running belt to 2 3 mph Operate the treadmill for at least 5 minutes a Concentrate on the feel of the running belt and the sound of the drive motor and rollers Be on the alert for unusual noises smells or vibrations b On SCR units measure and log the AC input current under loaded and unloaded con ditions On PWM units log the power bits under loaded and unloaded conditions c Observe the LEDs on the electronic console Make sure that each LED lights as the in formation corresponding to that LED is displayed on the electronic console 3 Press the STOP key When the treadmill comes to a stop view the electronic console as the treadmill scans time speed distance and percent of lift 4 Press the INCLINE A key while viewing the electronic console Confirm that the running bed inclines and the incline display increments to twelve percent as the INCLINE A key is pressed 5 Press the INCLINE Wkey while viewing the electronic console Confirm that the running bed returns to a level position and the incline display decrements to minus two percent as the INCLINE W key is pressed Turn off the treadmill with the circuit breaker then unplug the treadmill from the wall outlet Page 12 C944 Treadmill Procedure 4 1 Calibrating the Lift Limit Switches WARNING Always turn off the circuit breaker and unplug the treadmill before you remove the tre
13. to return to the PRECOR C944 banner Diagram 2 2 Odometer Display Page 8 C944 Treadmill Procedure 2 3 Changing Club Settings This procedure allows you to change the following club settings e English Standard Metric Units Selecting United States standard units causes data to be displayed in feet miles and pounds Data is displayed in meters kilograms and kilometers if metric units are selected e Maximum Speed This selection is used to artificially limit the maximum speed the treadmill can attain when a user is working out The C944 Treadmill can attain an absolute maximum speed of 12 0 MPH 20 0 KPH for PWM units and 10 0 MPH 16 0 KPH for SCR units This speed selec tion mode cannot exceed these speeds but rather speeds may be selected that are lower than these maximums Maximum Workout Time This club selection is used to limit the maximum workout time the treadmill may be used during a workout The time may range from a minimum of 10 minutes to an absolute maxi mum of 240 minutes The default from the factory is 60 minutes Procedure 1 Plug the power cord into the wall outlet then turn on the treadmill with the circuit breaker 2 If you wish to verify the measurement standard the treadmill is currently using continue with the next step If you wish to change the measurement standard the treadmill is using skip to Step 5 Checking the Measurement Standard 3 Press ENTER until the WEIGHT indicator light
14. 44 treadmill use a phillips screwdriver to loosen and tighten the screw on the capacitor mounting bracket 4 Remove the capacitor from the mounting bracket Replacing the Lift Motor Capacitor 5 Position the lift motor capacitor in the capacitor mounting bracket Note Wire length and wire assembly configuration may limit the mounting orientations of the lift motor capacitor Make sure that the wires you removed from the capacitor will reach the capacitor terminals before you perform the next step 6 Tighten the screw and nut on the capacitor mounting bracket 7 Connect the wires removed in Step 2 to the capacitor terminals Note Because the lift motor capacitor is not polarized you can connect wires to either terminal However you cannot mix wire colors on any one terminal 8 Check the operation of the treadmill as described in Section Three of this appendix Page 35 C944 Treadmill Procedure 6 4 Replacing the Lift Platform WARNING Always turn off the circuit breaker and unplug the treadmill before you remove the treadmill hood Removing the Lift Platform 1 Tum off the treadmill with the circuit breaker then unplug the power cord from the wall outlet Note To avoid scratching or marring the treadmill put a drop cloth underneath the treadmill when you perform Step 2 2 Place the treadmill on its left side 3 Remove the lower bolt and nut that secure the lift motor to the lift platform Note It is no
15. C944 Treadmill C944 Treadmill Warning This service manual is for use by Precor trained service providers only If you are not a Precor Trained Servicer you must not attempt to service any Precor Product Call your dealer for service This document contains information required to perform the majority of troubleshooting and replacement procedures required to repair and maintain this product This document contains general product information software diagnostic procedures when available preventative maintenance procedures inspection and adjustment procedures troubleshooting procedures replacement procedures and electrical block and wiring diagrams To move directly to a procedure click the appropriate procedure in the bookmark section to the left of this page You may drag the separator bar between this page and the bookmark section to change the size of the page being viewed 2003 Precor Incorporated Unauthorized Reproduction and Distribution Prohibited By Law Page 1 C944 Treadmill Section One Things you Should Know About This Appendix Section One Things You Should Know This section includes technical specifications Read this section as well as the C944 Treadmill Owner s Manual before you perform the maintenance procedures in this manual Section Two Software Features Precor s C944 Treadmill is programmed with several diagnostic and setup features This section contains the procedures you need to ac
16. The function LEDs illuminate simultaneously and then extinguish f Each function LED illuminates separately and then extinguishes 4 If you do not observe the LED illumination sequences described in Step 3 THEN OTHERWISE Replace the upper PCA as described The LED passed successfully in Procedure 5 2 of the Commercial continue with the next step Treadmill Service Manual Page 4 C944 Treadmill Diagram 2 1 C944 Treadmill Display Lo Press ENTER n ave WEIGHT mn THE LEFT then pess ENTER n eee HHU TES PER MILE Kh Used or t specify WORKOUT TIME then pess ENTER TO WORKOUT ThE S oiT cE Usesorv to koke moi COURSE then then pess ENTER n CALORIES PER MINUTE Press SPEED to begin D CALORES INCLINE Press QUICK START ekwi eae nen te WERIT Less l la CARDIOUSCULAE mo TRATE Cabries are ba seri on a 650 pound person Fo enzuye cami ao TW P s por rt L SMART RATE a Pecar bean m ebot sap Toemiest wear Ge Meca kea tae morar tp actinte We SMUT RATE lepe and tie Beart kale diptay CAUTION Route cond of Safety Key under handiebarwhen attaching clip to cbthing 5 With the ADJUST LIFT banner scrolling press the INCLINE keys The running deck will incline when the INCLINE key is pressed and decline as the INCLINE wkey is pressed The running deck will stop moving when the key is released After the INCLINE keys are pressed the message PRESS ENTER WHEN FINISHED will scroll by Note The
17. Typically if a problem exists with the speed sensor the drive motor will operate perhaps only briefly before a speed related error occurs errors 20 26 Note Some speed sensor have red black and white wires and some have red black and green wires The following procedures will assume red black and white wires If the speed sensor on the unit under test has red black and green wires perform your test procedures using the green wire instead of the white wire The white and green wires serve the same function 1 Check the distance between the end of the speed sensor and a flywheel lobe the distance should be approximately 050 inches Adjust the distance between the speed semsor and flywheel if required 2 Set the treadmill circuit breaker in the on position Using a DC voltmeter measure the voltage between terminal 1 of J5 red wire and terminal 3 of J5 white wire on the lower PCA Slowly rotate the drive motor flywheel The voltage should read approximately 5 Vdc as a flywheel lobe passes the speed sensor and approximately 0 Vdc when a flywheel lobe is not in front of the speed sensor 3 Ifthe voltage in step 1 is correct go to step 6 If the voltage in step 1 is 0 Vdc or significantly low when a flywheel lobe passes the speed sensor continue with step 4 4 Measure the voltage between terminal 1 of J5 red wire and terminal 4 of J5 black wire on the lower PCA The voltage should read approximately 5 Vdc 5 If the v
18. a tie Mm PASL uaap 9a dan yn pou sa i umogy uaap va n Uondi3saq Tojo Bisaq osuss osoz F sepoig Gumiwa 34617 Vod oo a a May ced APA ow Ove S M punog 92 12 pasn jou 0z 8i uonisod yo db dw Aayes 94 Zezsu axi SL zezsu axa tL aulu O18Z El pesn jou ral dn yn Li Umop yi o 101 U09 JOJOW 6 Josuas paadg 8 128 ep SSOID 0Jaz IA S Fi uondusaseq uld SuonJoUUOJ siqen UOqqny a oe a puipleddn uogqry pedAey aiqeo A ddns Jemod SGA OSE joyuop onuuEJH JONUOD jo U0D alemyos peeds pesds WPI OL WOJ4 WOl4 o WOU tov Ta ig or ug EEE SA dwe oz OpZ SoyaMs Old 71g dwe z dwe g o ya AJA M j z e r NMa amp 24r lt Sl oL yos T lt Tear Fear L aon 99g WMd si Sa zZ Laf lt os Fat ItUupeo4 Wd Otz T969 Otziz96I OrZ br6DJ Page 46
19. actuated There are three potential causes for this condition They are lower PCA ribbon cable or upper PCA There are not any adequate means of troubleshooting these components other than substituting known good components Replace only one component at a time If the component that you replaced does not correct the problem replace the original component Try substituting the lower PCA first the ribbon cable second and the upper PCA third If you have performed all of the above procedures and have been unable to correct the problem call Precor Customer Support Using an ohmmeter measure the resistance across the lift capacitor terminals The lower PCA resistance should be extremely high megohms the capacitor resistance should be extremely high megohms and the lift motor winding should read approximately 34Q or 1220 If it measures significantly high or open vo replace the lift motor If the resistance measurement in step 6 was approximately 34Q 120 VAC units or 1220 240 VAC units replace the lift capacitor If you have performed all of the above procedures and have been unable to correct the problem call Precor Customer Support Typically when the lift is able to physically move but causes a lift error the problem is in the lift position identification system rotation sensor and zero sense switch Connect a DC voltmeter between the white wire term 2 of J3 and the red wire term 4 of J3 on the lower PCA Set the treadmill c
20. admill hood 1 If the treadmill is not already at zero percent incline press any key when the CALIBRATE LIFT PRESS ANY KEY prompt is displayed 2 Using the ruler measure the distance between the floor and the top of the front and back ends of the side rail see Diagram 4 1 Note The distance between the floor and the top of the front end of the side rail should be 9 inches 3 If the distances recorded in the previous step are equal to within 1 4 THEN OTHERWISE Skip to Step 17 Continue with the next step 4 With the PRECOR C944 banner scrolling press the SPEED a SPEED wand INCLINE A keys simultaneously or keys 4 5 1 7 6 5 7 6 1 sequentially on units with standard access codes 5 Press ENTER when the display test starts Page 13 C944 Treadmill Diagram 4 1 Measuring the Side Rail 6 With the ADJUST LIFT prompt displayed press either the INCLINE A or W INCLINE key to move the lift The message PRESS ENTER WHEN FINISHED is displayed on the electronic console 7 Ifthe distance measured at the front of the side rail is larger than the distance measured at the back of the side rail THEN OTHERWISE Press the INCLINE Y key until Press the INCLINE A key until the the front and back treadmill front and back treadmill measurements measurements are equal then are equal then press RESET press RESET 8 Turn off the treadmill with the circuit breaker then unplug the power cord from the wall outl
21. aining red wire connected to the capacitor terminal 3 Remove the black lift motor lead from the lift motor capacitor but leave the remaining black wire connected to the capacitor terminal 4 Disconnect the connector on the white lift motor lead 5 Remove the revolution sensor plug from the J2 connector jack on the lower PCA Note When the revolution sensor wire assembly is disconnected from the lower PCA the zero sense switch must be disconnected as well 6 Disconnect the two blue wires on the rotation sensor wire assembly from the zero sense switch terminals 7 Place the treadmill on its left side 8 Remove the two shoulder screws and nuts that secure the lift motor to the treadmill frame and lift platform Remove the lift motor and set it aside 9 Remove the set screw that secures the magnet hub to the lift motor Set aside the magnet hub Page 26 C944 Treadmill Diagram 6 1 Exploded view of the Lift Motor with Rotation Sensor Lift Motor Mn Or alll gt Rotation Sensor Mounting Bracket Rotation Sensor Magnet Hub a F a Magnet Page 27 C944 Treadmill Replacing the Magnet 10 Remove the set screw that secures the magnet to the magnet hub Discard the magnet Note When you position the magnet in the magnet hub place the north pole towards the center of the magnet hub The north pole of the magnet should be marked with a spot of white paint If the magnet on the treadmill you are s
22. cess the diagnostic features on this treadmill Section Three Checking Treadmill Operation This section provides you with a quick way of checking treadmill operation Check treadmill operation at the end of a maintenance procedure and when it is necessary to ensure that the treadmill is operating properly Section Four Inspection and Adjustment Procedures Perform inspection procedures when a trouble symptom points to a particular problem and after removing and replacing major components Many maintenance problems can be fixed by adjusting various treadmill components This section also provides you with the step by step procedures required to make these adjustments Section Five Troubleshooting Procedures The diagnostic and troubleshooting procedures contained in this section should be performed when it is necessary to isolate a problem to a particular component Section Six Replacement Procedures When a treadmill component must be replaced go to this section and follow the step by step procedures required to remove and replace the component Section Seven Technical Diagrams and Parts Lists This section includes wiring diagrams and block diagrams for SCR and PWM C944 Treadmills General Information For the latest exploded view part number and part pricing information visit the Precor dealer website at www precor com Dealer Page 2 Technical Specifications Physical Specifications Length Width Height Running
23. ential Treadmill Service Manual 2 Remove the screws that secure the upper display assembly to the upper handrail Carefully pull some excess interconnect cable out from the targa upright Rotate the display housing so that the rear of the upper PCA is facing upward and set the display housing on the upper handrail 3 Attach the wrist strap to your arm then connect the ground lead of the wrist strap to the treadmill frame Set the voltmeter to a range that will conveniently read 6 Vdc Diagram 5 1 Upper PCA Component Layout a 5 i S000 0000006 OO J2 ki ODQO0O0O0O0OOOOOOOOO J1 25 1 4 Set the voltmeter to a range that will conveniently read 6 Vdc 5 Set the circuit breaker in the on position 6 Usea DVM set for DC volts and read between pin 6 of J3 and the each of the pins in Table 5 1 no keys pressed and Table 5 2 with the appropriate key pressed Page 18 C944 Treadmill Table 5 1 Voltage Test Points Function Keys Not Pressed Place the positive lead of the The voltmeter should read voltmeter on Pin 3 of J3 5 Vdc 500 mVdc Pin 4 of J3 5 Vdc 500 mVdc Pin 5 of J3 5 Vdc 500 mVdc Pin 7 of J3 5 Vdc 500 mVdc Pin 8 of J3 5 Vdc 500 mVdc Pin 9 of J3 5 Vdc 500 mVdc Pin 10 of J3 5 Vdc 500 mVdc Table 5 2 Voltage Test Points Function Keys Pressed Place the positive At the display The voltmeter should voltmeter lead on enclosure press read between
24. ervicing is not marked use either a compass or another magnet to determine the north pole 11 Position the new magnet in the magnet hub 12 Tighten the set screw that secures the magnet to the magnet hub 13 If you are replacing the revolution sensor THEN OTHERWISE Continue with the next step Skip to Step 19 14 Remove the screw and washer that secure the rotation sensor to the sensor bracket see Diagram 6 1 15 Position the revolution sensor at its mounting location 16 Position the screw and washer that secure the rotation sensor to the sensor bracket Torque the screw to 8 in lbs 17 If you are replacing the lift motor you removed earlier in this procedure THEN OTHERWISE Continue with the next step Skip to Step 25 Removing and Replacing the Rotation Sensor Bracket 18 Remove the two nuts that secure the sensor bracket to the lift motor 19 Position the sensor bracket removed in the previous step on the lift motor 20 Replace the two nuts that secure the sensor bracket to the lift motor 21 Position the magnet hub on the lift motor so that it is flush with the speed sensor bracket 22 Replace the set screw that secures the magnet hub to the lift motor Page 28 C944 Treadmill Replacing the Lift Motor 23 Extend the lift motor actuator 1 2 by turning the magnet hub Note To extend the lift motor actuator faster place a screwdriver shaft in the lower mounting hole of the lift motor and rota
25. et WARNING Before continuing with this procedure review the Warning and Caution statements listed in Section One of the Commercial Treadmill Service Manual 9 10 11 Remove the hood Check the position of the zero sense switch in relation to the switch actuator see Diagram 4 2 If the widest point of the switch actuator is lined up with the center of the wheel on the zero Page 14 C944 Treadmill sense switch THEN OTHERWISE The zero sense switch is calibrated The switch bracket must be adjusted correctly skip to Step 16 continue with the next step WARNING When power is applied to the treadmill the wires connected to the upper and lower limit switches carry 110 volts or 220 volts if you are servicing a 220 volt treadmill Turn off the treadmill and unplug the power cord from the wall outlet before you perform the following steps 12 Loosen the socket head bolts and washers that secure the switch bracket to the lift platform see Diagram 4 2 Page 15 C944 Treadmill Diagram 4 2 Limit Switch Bracket Lower Limit Switch Zero Sense Actuator Switch Upper Limit Switch Note The zero sense switch can be actuated if the center of the wheel is slightly above or slightly below the widest point of the switch actuator However for best results adjust the position of the zero sense switch as described in the following step Page 16 C944 Treadmill 13 If the center
26. following diagnostic test automatically searches for the upper and lower limit switches and the zero sense switch It also detects a non functional non moving lift 6 Watch the electronic console If the three limit switches are adjusted correctly the following series of messages is displayed on the electronic console GOING TO TWELVE PERCENT AT TWELVE PERCENT GOING TO UPPER LIMIT GOING TO NEG TWO PERCENT AT NEGATIVE TWO PERCENT GOING TO LOWER LIMIT GOING TO ZERO 7 Ifall of the messages listed in Step 6 are displayed on the electronic console Page 5 C944 Treadmill THEN OTHERWISE The treadmill lift switches are Press RESET to return to the PRESS calibrated correctly press ENTER ENTER FOR PROGRAMS prompt to continue then calibrate the lift systems described in Procedure 4 1 Note Software revision changes can only be made by replacing the currently installed PROM The revision of the software does not change by resetting the system Some software updates may require the user to perform a system reset Software numbers are invaluable for tracking and identifying problems and keeping abreast of changes to the operation and features of the product 8 The message VERSION scrolls across the display and will continue to do so while you hold any key down When the key is released you will see the software version number displayed in the middle right seven segment display Press ENTER to exit this mode Note The
27. following mode allows manual control of the motor speed while displaying the power bits It is useful in determining if the system is having difficulties running the motor and belt 9 The message POWER BITS scrolls across the display once Two numbers appear in the right upper and right middle seven segment displays The upper number is the power bits and the lower number is the requested speed in miles per hour or kilometers per hour Press the SPEED a key to start the motor The SPEED a SPEED v STOP and ENTER keys are active in this mode 10 Press the SPEED keys while you watch the right display window The power bits number increments as the SPEED akey is pressed and decrements as the SPEED wkey is pressed 11 Press either the STOP key or the ENTER key to stop the motor and exit this diagnostic Press the SPEED wkey until zero MPH or KPH is attained if you wish to stop the motor but not exit this diagnostic Note The keypad test is useful for troubleshooting stuck or non operating keys on the keypad Page 6 C944 Treadmill 12 Press each key listed below Verify that each single dot expands to four dots as the appropriate key is pressed ENTER Expands the far left dot INCLINE v Expands the second dot from the left INCLINE A Expands the third dot from the left STOP RESET Expands the center dot SPEED v Expands the third dot from the right SPEED A Expands the second dot from the right QUICK START CHANGE Expands the far
28. ft or Switch Bracket Note The limit switches and the actuator shaft are mounted on the switch bracket see Diagram 4 2 WARNING Always turn off the circuit breaker and unplug the treadmill before you remove the treadmill hood Procedure 1 Remove the hood 2 Ifyou are removing the actuator shaft THEN OTHERWISE Skip to Step 12 to remove the actuator Continue with the next step shaft Step 6 to remove the down limit switch or Step 9 to remove the zero sense switch Removing the Upper Limit Switch WARNING When power is applied to the treadmill the wires connected to the upper and lower limit switches carry high voltage Turn off the treadmill and unplug the power cord from the wall outlet before you perform the following steps 3 Carefully remove the red wires from the upper limit switch Note See Diagram 6 2 for limit switch wiring 4 Remove the screws and washers that secure the limit switch to the switch bracket 5 If you are removing more than one limit switch THEN OTHERWISE Continue with the next step to Skip to Step 11 remove the down limit switch or Step 9 to remove the zero sense switch Page 30 C944 Treadmill Removing the Down Limit Switch 6 Carefully remove the black wires from the down limit switch 7 Remove the screws and washers that secure the limit switch to the switch bracket see Diagram 4 2 8 Ifyou are removing the zero sense switch THEN OTHERWISE
29. ircuit breaker in the on position and slowly rotate the hub at the bottom of the lift motor by hand The DC voltmeter should read approximately 0 Vdc when the magnet in the hub is not near the hall effect sensor and approximately 5 VDC when the magnet is near the hall effect sensor If the voltage switches between 0 and 5 Vdc as the magnet passes the hall effect sensor continue with step 11 Page 21 10 C944 Treadmill Measure the voltage between the red wire term 4 of J3 and the black wire term 1 of J3 The voltage should read a constant 5 Vdc If the voltage is 0 or significantly lower than 5 Vdc disconnect the rotation sensor connector from the lower PCA Measure the voltage between the red wire term 4 of J3 and the black wire term 1 of J3 on the lower PCA If the voltage is still O Vdc or significantly low replace the lower PCA If the voltage is now correct replace the hall effect sensor Note If possible set the lift in a position that does not operate the zero sense switch The zero sense switch may be operated by hand to perform the tests in step 11 11 12 At this point the hall effect sensor is functioning normally but lift errors occur With a DC voltmeter measure the voltage across the zero sense center switch It should measure approximately 0 Vdc when the switch is not operated and approximately 5 Vdc when the switch is operated If the operated voltage is 0 Vdc or significantly low remove both blue
30. ircuit breaker must be added A licensed electrician may use the followings hints to determine if an A C service is dedicated 1 If on a 120 Vac system the A C distribution panel contains more circuit breakers than neutral leads the system has shared neutral leads and is not dedicated If an A C outlet 120 or 240 Vac has multiple hot and or neutral leads it is not a dedicated If either of the above conditions exist the system is not dedicated However absence of the above conditions does not necessarily mean that the system is dedicated If any doubt exists about A C systems dedication point to point tracing of the A C wiring may be the only way to prove system dedication Page 25 C944 Treadmill Procedure 6 1 Replacing the Lift Motor Rotation Sensor or Magnet Hub Note If you need to replace a lift motor that utilizes a hall effect rotation sensor remove the magnet hub and rotation sensor bracket from the defective lift motor and mount them on the new lift motor Unless the magnet and rotation sensor are defective do not remove them from their mounting positions on the magnet hub and sensor bracket Replacement lift motors are not furnished with the hall effect rotation sensor WARNING Always turn off the circuit breaker and unplug the treadmill before you remove the treadmill hood Removing the Lift Motor 1 Remove the hood 2 Remove the red lift motor lead from the lift motor capacitor but leave the rem
31. l s A C outlet and a new neutral lead and hot lead from the treadmill s A C outlet to the A C neutral distribution bar and circuit breaker must be added 240 Vac Systems 240 Vac distribution systems utilize a double pole circuit breaker two hot leads The A C safety ground green wire is connected to a ground bar in the distribution system The most common problems found are 1 the circuit is fed by a circuit breaker of less than 20 amp capacity and 2 both the hot leads feed several A C outlets The appropriate correction action or actions see below must be followed if any of the above conditions exist Corrective actions should only be undertaken by a licensed electrician 1 The circuit breaker feeding the treadmill is not a 20 amp circuit breaker If the circuit breaker is greater than 20 amps the circuit breaker should be replaced with a 20 amp circuit breaker If the circuit breaker is less than 20 amps the circuit breaker must be replaced with a 20 amp circuit breaker and the wiring from the A C distribution must be capable of safely handing 20 amps If the A C wiring is under sized it must be replaced with wire capable of safely handling 20 amps Please refer to local electrical codes when determining the appropriate wire size for a 20 amp circuit Both the hot leads feed several A C outlets Both hot leads must be removed from treadmill s A C outlet and two new hot leads from the treadmill s A C outlet to the c
32. mte Bead Page 39 C944 Treadmill Block Diagram 7 2 C944 SCR 120 Vac z euiuwaj 0 L euWS YOS 104 jas aq jsnw sieduni Zdf Lap eu s yod Jeddn JeUBiy JO 9OL YIM S L96J 8 S Z96D YO du JON yg yg 30A 06 VAAAST y Gao n ki 18 Ya Josuas J8 p ds M IPAG MoijBA 649 2 dn yo pay ZW A souonms umoq H7 19919 1835 asuas raz 7a HI uonduosaq 10109 Bisaq idauise a sepolq umwa y6n vod uonejoy n ea ooi mea OVA jwif JEMO ozi M E l uy gen go per pui Jaddn ojqea uoqqry punog g Z pasn jou 02 81 uonisod yn A din Hares A zezs ax Si zezst axa vi aujou 0487 eh JoujuoD jonuoj OIJUOD OUOS SN jou zi Pn it gdis p dg p d Yn esemyos umop UIT 0L p z OL Wouj WOIjoj Wwol4 o4ju00 YOS 6 Josuas pasds 8 ys ep ssoso 0JEZ L JAN S uonduosag uld suondauvo9 ajqey UOqqni upea L YOS OZL Y96J OZ1 Z969 OZ1 br6J Page 40 Wiring Diagram 7 3 C944 SCR 240 Vac White i Red Rotation Sensor j a balan Lift Capacitor Red a Red Zero Sense Switch Black Ble Ble Down Limit Switch SOR Black Black oo C944 Treadmill White Red Lift Motor Black Circut Breaker ae Blue Power Cord Snubber 3614 2 Black 7 Ja a d4 J9 Lower PCA Terminal 4 Red 2 Block 5 Red Black 3 le mon e Fi Lt Fuse 7 Red Black 4 24 Slow Blow J7 Speed Sensor Red fi Black Blue J6 F2 System Fuse 5A Gow Blox J8
33. oltage is missing or significantly low disconnect the speed sensor plug from the lower PCA Measure the voltage between pins 1 amp 4 of the J5 plug on the lower PCA If the voltage is approximately 5 Vdc replace the speed sensor If the voltage is missing or significantly low replace the lower PCA 6 At this point the speed sensor output is good but a speed error occurs There are three potential causes for this condition They are ribbon cable upper PCA or lower PCA There are no good means of troubleshooting these components other than substituting known good components Replace only one component at a time If the component that you replaced does not correct the problem replace the original component Try substituting the ribbon cable first the upper PCA second and the lower PCA third 7 Ifyou have performed all of the above procedures and have been unable to correct the problem call Precor Customer Support Page 23 C944 Treadmill Procedure 5 4 Troubleshooting the External A C Power Source It is extremely important that any Precor treadmill be connected to and operated on a dedicated 20 amp A C circuit A 20 amp dedicated circuit is defined as a circuit fed by a 20 amp circuit breaker that feeds a single load A treadmill operating from a non dedicated circuit or a circuit breaker of less than 20 amps capacity will not have the necessary power available to operate normally under higher load conditions The lack of available
34. power can cause any number of symptoms ranging from numerous intermittent seemingly inexplicable error conditions poor speed control or tripping the house circuit breaker If any of the above symptoms exist the external A C circuit must be checked and confirmed to be a 20 amp dedicated circuit before troubleshooting the treadmill In addition the A C voltage must be checked Nominal A C operating voltage on 120 Vac circuits is 105 Vac to 120 Vac Nominal A C operating voltage on 240 Vac circuits is 208 Vac to 240 Vac For operator safety considerations and to minimize electrostatic discharge conditions the A C frame ground continuity must also be verified to be a low resistance connection to the A C distribution ground bar Important If the A C circuit feeding a treadmill is found to be a non dedicated circuit or a circuit equipped with a circuit breaker with a capacity of less than 20 amps the A C circuit must be corrected to be a 20 amp dedicated circuit before any reliable troubleshooting can be performed on the treadmill More importantly a non dedicated circuit may constitute a safety hazard to the treadmill operator 120 Vac Systems 120 Vac distribution systems utilize a single pole circuit breaker hot lead and a neutral lead connected to a common neutral ground bar The A C safety ground green wire is connected to a separate ground bar in the distribution system The most common problems found are 1 the circ
35. r PCA a Ribbon Cable Page 43 C944 Treadmill Block Diagram 7 6 C944 PWM 120 Vac g eujus 0 zeu WM d 104 Jas aq jsnw Zdf Lap s1 dunf Yod Jaddn 969 8 Z969 1 SYON Pla JOJOIN josuas Jemod N oa peeds SA Ose L epa q Aiddns Josues uonejoy IPAS pat za a PASI Usa19 9a OVA s010W dn yn pay sa Och ow umog WT uaap va a uonduosaq 10j05 Bisaq sepotq uywa 3481 youn uoqqry punoJ9 Z z oz 8i Li 9 Sb zezsu axe bi Md f4 lt uljour kana EL jo uog fONUOD fONUOD EJU0J sar SSN jo P dn yi ii p dg peeds HI eemyos XS 4 UMOP YI OL oL wouj Woigyoj Woy beds L 8 0N JO UOD JOJO 6 sos sosues paeds 8 lt slap sso oZ L WAMad Laf OGA S oF stars uonduossq uld YOIs Frank suonoauuo jqeg uoqqiy pwpealL NMd OZLIY96D OZL Z969 OZLIFY6J Page 44 Wiring Diagram 7 7 C944 PWM 240 Vac Up Limit Switch Red Rotation Sensor Lift oe Zero Serse Switch Down Limit Switch Blue Ge Black Black P3 F1 Lift Fuse 2A Slow Blow 5 as ee Black Brown Black ACI 2A Slow Bl ow ayi N Lower PCA Heart Rate Jg Option sayly aun C944 Treadmill pop amog Page 45 C944 Treadmill Block Diagram 7 8 C944 PWM 240 Vac eurus a Z euUa WMd Joj 498 3q SnU zafe Lar sadwnf yod Joddn p969 8 Zaso l 9JON ya DONN sosuas _ ra Ka aj ST kote Uy peeds 9 Sd ai g u sosues eee PAS pay z
36. racket at its mounting location 19 Replace the socket head screws and washers that secure the switch bracket to the lift motor platform Replacing the Actuator Shaft and Switch Actuator 20 Slide the actuator shaft through the switch bracket until it is positioned at its mounting location 21 Thread the actuator block onto the lower end of the actuator shaft Note If necessary use the pliers to secure the actuator block to the actuator shaft Page 32 22 23 24 25 26 C944 Treadmill Position the shoulder screw removed in Step 13 through the actuator block and into the base of the lift platform Tighten the shoulder screw that connects the actuator shaft and actuator block to the lift platform Position the switch actuator on the top of the actuator shaft Replace the screw that secures the switch actuator to the actuator shaft If you must replace one or more of the limit switches THEN OTHERWISE Continue with the next step to Skip to Step 38 replace the upper limit switch skip to step 31 to replace the down limit switch or skip to Step 35 to replace the zero sense switch Replacing the Upper Lift Limit Switch 27 28 29 30 Position the limit switch at its mounting location Replace the screws and washers that secure the limit switch to the switch bracket Connect the red wires disconnected in Step 3 to the limit switch terminals If you are replacing more than one limit
37. s of an AC line voltage driven lift motor 120 Vac or 240 Vac a hall effect rotation sensor and three position location switches The lift system orients itself by locating the zero sense switch when the treadmill is powered up When the zero sense switch is activated the system recognizes that physical position as 0 incline If the zero sense switch is activated when the treadmill is powered up the system proceeds directly into the normal program mode If the zero sense switch is not activated when the treadmill is powered up the system performs a self calibration procedure The purpose of the self calibration procedure is to locate the zero sense switch 0 incline The user will be prompted to press any key to commence the lift calibration The treadmill will go up 4 because the lowest the treadmill could have been at power up is 3 If the treadmill does not locate the zero sense switch by going up 4 it will stop and then go down until it activates the zero sense switch The system will then proceed to the normal program mode Once the 0 lift position has been located the system tracks any subsequent lift operations by counting motor revolutions A hall effect sensor is mounted on a bracket that is next to a hub that is attached to the lift motor shaft As the lift motors operates a magnet mounted in the hub passes the hall effect sensor once per motor revolution The hall effect sensor send one pulse to the lift control system per revolution
38. surface Motor Speed Incline Power Weight Shipping Weight C944 Treadmill 76 inches 193 cm Handrails 31 5 inches 80 cm Base 28 5 inches 72 cm 44 inches 112 cm 53 inches by 18 inches 135 cm by 46 cm 2 hp continuous duty DC 120 Vac and 240 Vac models 0 5 to 12 mph 0 8 to 19 kph 10 mph is equivalent to a 6 minute mile 2 to 12 grade 50 60 Hz 120 Vac 50 60 Hz 240 Vac 276 Ibs 119 kg 326 Ibs 147 kg Page 3 C944 Treadmill Procedure 2 1 Accessing the Diagnostic Software The C944 Treadmill s diagnostic software consists of the following modes e Display Test Manual Lift Adjust e Troubleshoot Lift e Software Version Power Bits Keypad Test Procedure 1 Plug the power cord into the wall outlet then turn on the treadmill with the circuit breaker 2 With the PRECOR C944 banner scrolling press the SPEED a SPEED wand INCLINE A keys simultaneously or keys RESET 5 1 7 6 5 7 6 1 sequentially on units with standard access codes see Diagram 2 1 3 Watch the electronic display as the LED test progresses This test is programmed to display the following LED illumination sequence a Every LED on the left display window illuminates simultaneously b The lower row of the display window cycles from red to yellow to green c Diagonal lines of illuminated LEDs sweep across the left display window d The right display windows illuminate then decrement from 8 8 8 8 to 0 0 0 0 e
39. t necessary to remove the lift motor when you remove the lift platform 4 Remove the bolt that connects the actuator block to the lift platform 5 Remove the bolts and nuts that secure the lift platform to the treadmill frame see Diagram 6 3 Diagram 6 3 Lift Platform Lift Platform Mounting Bolt Actuator Block Lift Platform Lift Motor Page 36 C944 Treadmill Replacing the Lift Platform 6 With the treadmill still on its left side position the lift platform at its mounting position 7 Replace the two bolts and nuts that secure the lift platform to the treadmill frame Note The original nuts used to mount the lift platform are Kep nuts which do not require a separate washer If you do not use Kep nuts to mount the lift platform use washers when you mount the lift platform to the treadmill frame 8 Replace the bolt that connects the actuator block to the lift platform 9 Replace the lower bolt and nut that secure the lift motor to the treadmill frame 10 Check the operation of the treadmill as described in Section Three of this appendix Page 37 C944 Treadmill Procedure 6 5 Replacing the PROM Anti static kits part number 20024 101 can be ordered from Precor 1 The PROM and the associated printed circuit assembly PCA are static sensitive Anti static devices must be used and all anti static precautions must be followed during this procedure Remove the printed circuit assembly per
40. te the lift motor tube 24 Position the lift motor at its mounting location Note When you perform Step 25 replace the lower screw and nut first 25 Replace the two shoulder screws and nuts that secure the lift motor to the treadmill frame Note The original nuts used to mount the lift motor are Kep nuts which do not require a separate washer If you do not use Kep nuts to mount the lift motor use washers when you mount the lift motor to the treadmill frame 26 Return the treadmill to an upright position 27 Connect the black lift motor lead to the terminal of the lift motor capacitor that already has a black wire 28 Connect the red lift motor lead to the terminal of the lift motor capacitor that already has a red wire 29 Connect the connector on the white lift motor lead that connects the lift motor to pin 4 of lower PCA connector J3 30 Connect the molex connector on the revolution sensor wire assembly to connector J2 on the lower PCA 31 Connect the two blue wires on the revolution sensor wire assembly to the terminals on the zero sense switch terminals 32 Calibrate the treadmill lift assembly as described in Procedure 4 1 of this appendix 33 Check the operation of the treadmill as described in Section Three of this appendix then replace the hood as described in Procedure 5 1 of the Commercial Treadmill Service Manual Page 29 C944 Treadmill Procedure 6 2 Replacing the Limit Switches Actuator Sha
41. uit is fed by a circuit breaker of less than 20 amp capacity 2 the circuit breaker correctly feeds a single A C outlet but the neutral is common between several A C outlets and 3 both the hot and neutral leads feed several A C outlets The appropriate correction action or actions see below must be followed if any of the above conditions exist Corrective actions should only be undertaken by a licensed electrician 1 The circuit breaker feeding the treadmill is not a 20 amp circuit breaker If the circuit breaker is greater than 20 amps the circuit breaker should be replaced with a 20 amp circuit breaker If the circuit breaker is less than 20 amps the circuit breaker must be replaced with a 20 amp circuit breaker and the wiring from the A C distribution must be capable of safely handing 20 amps If the A C wiring is under sized it must be replaced with wire capable of safely handling 20 amps Please refer to local electrical codes when determining the appropriate wire size for a 20 amp circuit Page 24 C944 Treadmill The circuit breaker correctly feeds a single A C outlet but the neutral is common between several A C outlets The common neutral lead must be removed from treadmill s A C outlet and a new neutral lead from the treadmill s A C outlet to the A C neutral distribution bar must be added Both the hot and neutral leads feed several A C outlets Both the common neutral and hot leads must be removed from treadmil
42. wires from the zero sense switch Measure the voltage between the two blue wires If the voltage is now correct replace the zero sense switch If the voltage is still O Vdc or significantly low replace the lower PCA At this point the hall effect sensor and the zero sense switch are functioning normally but lift errors occur There are three potential causes for this condition They are lower PCA ribbon cable or upper PCA There are no good means of troubleshooting these components other than substituting known good components Replace only one component at a time If the component that you replaced does not correct the problem replace the original component Try substituting the lower PCA first the ribbon cable second and the upper PCA third If you have performed all of the above procedures and have been unable to correct the problem call Precor Customer Support Page 22 C944 Treadmill Procedure 5 3 Troubleshooting the Speed Sensor Note The speed sensor is a hall effect sensor that emits a pulse when a flywheel lobe passes it The speed control circuit processes the pulse train emitted by the speed sensor The speed sensor signal is a real time representation of the operating speed of the treadmill The speed control circuit compares the real time speed speed sensor output with the speed that it expects the treadmill to be operating at and acts accordingly to control treadmill speed or initiate an error code sequence if necessary

Service Manual, C944 Treadmill.fm

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