T611 Repair Manual (Electronics)

Transcription

1 T611 Repair Manual (Electronics)

2 Table of Contents Product Picture T Overlay T Component Placement T611 Display Board Component Placement T611 Lower Compartment Display Block Diagram T Cable Connections T611 Display Board Cable Connections T611 Drive Board LED Indicators T611 Display Board Indicator LEDs T611 Drive Board Electronic Specifications T Electronic Malfunction Troubleshooting Table T Troubleshooting Safety Key Malfunction T Troubleshooting No Start Up T Troubleshooting No Start Up T Troubleshooting Key Malfunction Soft Keys T Troubleshooting Key Malfunction Soft Keys T Troubleshooting No Incline Operation T Troubleshooting Incline Position Malfunction T Troubleshooting HTR Malfunction T Troubleshooting Fuse Broke at Start T Troubleshooting Fuse Broke after Motor Moves T Troubleshooting Fuse Broke after Use T Troubleshooting ERR-1 Appears before Motor Moves T Troubleshooting ERR-1 Appears after Motor Moves T Troubleshooting ERR-3 T Troubleshooting ERR-7 T Troubleshooting ERR-10 T Troubleshooting SERVICE REQUIRED T Other Topics Basic Parameter Settings T Other Topics Error Code Chart T611

3 Inspection and Measurement Optic Sensor T Inspection and Measurement Transformer T Inspection and Measurement Motor Brushes T Inspection and Measurement Motor Voltage Measurement T Inspection and Measurement Incline Voltage Measurement T Inspection and Measurement VR Voltage Measurement T Inspection and Measurement Incline Motor and VR Calibration T611

4 1-1. Product Picture T

5 1-2. Overlay T

6 1-3. Component Placement T611 Display Board Telemetry heart rate receiver board Display board 1-3-1

7 1-3. Connections-T611 Bridge Board HTR board Bridge board To Safety key board Soft key 1-3-2

8 1-3. Component Placement T611 Lower Compartment Drive board Transformer Optic sensor Motor Filter Incline VR set DC incline motor 1-3-3

9 1-4. Display Block Diagram T611 Telemetry receiver board Display board Safety key Key pad Bridge board Sensor L Sensor R HTR board AC1 FUSE SW Filter Motor AC2 Transformer Drive board Optic sensor Thermal sensor Inductor (220v) Incline motor Incline VR 1-4-1

10 1-5. Cable Connections T611 Display Board To bridge board HTR To telemetry heart rate receiver board To bridge safety key board To drive board To bridge board soft key 1-5-1

11 1-5. Connections-T611 Bridge Board To Display To HTR board To Safetykey board 1-5-2

12 1-5. Cable Connections T611 Drive Board M+,M- To motor To power supply AC1, AC2 To motor thermal sensor To transformer To display board To VR set To incline motor To optic sensor 1-5-3

13 1-6. LED Indicators T611 Display Board LED1 power indicator Lit indicates 5 VDC power supply

14 1-6. Indicator LEDs T611 Drive Board LED 4 M-Temp Lit indicates motor temperature is too hot. LED 2 Lit indicates VCC power supply. Transformer fuse LED 3 EMG Lit indicates motor circuit error. LED6 INC-UP Lit indicates incline is operating upward. LED5 INC-DN Lit indicates incline is operating downward. LED 7 MC indicator Flashing indicates an incoming optic sensor signal

15 1-7. Electronic Specifications T611 Specification Details Notes Exterior power supply 110V / 220V Motor DC motor (with internal thermal switch) With brushes With heat protection 3.0 Hp Optic sensor Infrared optic sensor Speed range KPH: (KPH) MPH: (MPH) Power: DC motor 40V Incline Incline range: 0% -15% VR calibration: 0%= 1.20V; 15% = 3.57V Display LED, Dot matrix led Windows WT LOSS 65%, HEART RATE, CARDIO 80%, Calories, SPEED, TIME, DISTANCE, CAL/HR, METS, PACE, INCLINE,TIME Workout programs MANUAL / HILL / RANDOM / INTV / CARDIO / GLUTE / ZONE TRAINER WT LOSS / CARDIO Heart rate control program HRC 65% / HRC 85% Heart rate HTR / telemetry 1-7-1

16 2-1. Electronic Malfunction Troubleshooting Table T611 Malfunction Circumstance Inspection and test points Components to Safety key malfunction No start up No start up Telemetry heart rate malfunction Contact heart rate malfunction Put safety key in place. Display has no reaction. Safety key appears on the display. Power on indicator does not light. Power on indicator lights but the display does not light. Telemetry heart rate malfunction Contact heart rate malfunction 1. Inspect the cable connections on the lower part of the display and safety key. 2. Inspect the safety key magnet. 3. Inspect the safety key board. 1. Inspect the power cord connection. 2. Inspect all cable connections. 3. Inspect the fuse, the fuse holder, and the power switch. 4. Drive board components have an electrical short. Replace the drive board. 1. Inspect all cable connections, including connector cables. 2. Inspect whether drive board LED2 lights: a. If LED2 lights, inspect and test the transformer fuse. 3. Inspect whether LED1 on the display lights. a. If LED1 does not light, inspect the data cable from the display to the drive board. b. If LED1 does light, inspect the display program IC. Re-install the display IC. 1. Inspect the heart rate transmitter strap and its batteries. Replace batteries if they have not been replaced recently. 2. Inspect the receiver board cables. 3. Test or replace the receiver board. 4. Inspect for environmental interference, for example, from speakers and lights. 1. Inspect the HTR wire connections on the bridge board. 2. Inspect the HTR indicator light. 3. Replace the HTR board. replace Safety key board 1. Fuse, fuse holder 2. Drive board 1. Transformer 2. Drive board 3. Display board program IC 1. Heart rate transmitter 2. Heart rate receiver board 1. HTR board (Heart touch rate = contact heart rate) Notes 2-1-1

17 2-1. Electronic Malfunction Troubleshooting Table T611 Malfunction Circumstance Inspection and test points Components to Incline position is not correct. Key malfunction ERR 1 Incline position on display differs from actual position. Key does not operate or operates continually. Motor does not rotate, ERR 1 appears. ERR 1 Motor operates, ERR 1 appears. ERR 3 Display speed differs from actual speed. 1. Inspect all cable connections. 2. Inspect drive board incline VR voltage across red and green wires. Normal: 0% = 1.20 VDC, 15% = 3.57 VDC. If not, recalibrate the incline VR. 3. If VR voltage fluctuates greatly, the VR is bad. Replace the VR. If the VR voltage is correct but the height is incorrect, replace the display board. 1. Inspect the soft key connection. 2. If the <program> or <change> key is bad, replace the upper soft keys on the display. 3. If other keys malfunction, replace the lower soft keys on the display. 1. There is no power to the motor; the motor cannot operate. 2. Inspect the motor brushes. 3. Measure voltage from the drive board to the motor. If there is no voltage, replace the drive board. If there is voltage, inspect the following: a. transformer voltage. b. whether the EMG indicator lights. c. whether IGBTs have an electrical short. Replace the drive board. 4. Inspect motor brushes or the commutator. 1. The program did not detect the optic sensor signal. 2. Inspect the CLK indicator on the drive board. a. If the CLK indicator is not lit, clean or replace the optic sensor. b. If the CLK indicator lights normally, inspect the data cable from the display to the drive board. Re-install the display IC. 1. Inspect KPH/MPH setting. 2. Inspect the optic wheel teeth. 3. Replace the optic sensor. 4. Replace the drive board. replace 1. VR 2. Display board 1. Soft keys (upper) 2. Soft keys (lower) 1. Drive board 2. Motor brushes, motor 1. Optic sensor 1. Optic sensor 2. Drive board Notes 2-1-2

18 2-1. Electronic Malfunction Troubleshooting Table T611 Malfunction Circumstance Inspection and test points Components to ERR 7 ERR7 appears at startup. 1. Inspect the incline VR cable connection. 2. Usually ERR7 indicates the display is stuck at either the highest or lowest position. 3. Inspect whether LED5 and LED6 light on the drive board. If lit, the display or cable malfunction may be causing a malfunction. 4. Inspect whether the drive board emits voltage to the incline motor. If not, replace the drive board. 5. Recalibrate the incline set or replace the incline set as a test. SERVICE REQUIRED Main fuse is broken. Main fuse is broken. Main fuse is broken. Show total distance Display shows SERVICE REQUIRED TREADMILL SHUTTING DOWN STOPPING Turn on unit. The fuse blows. Press the speed up key. The motor start up fuse blows. In use, the main fuse blows. 1. Inspect the motor thermal switch wire connection and the LED4 M-TEMP on the drive board. Feel the motor. Is it hot? 2. If the motor is hot and the unit has been in use, turn off the unit. Let the unit rest one half hour or more. Then turn off the unit. 3.The running belt and deck need to lubrication. 4.Inspect the running belt and deck. 5.if necessary, replace the running belt. 6. If steps above do not solve the problem, replace the motor. 1. Inspect whether the power cord has an electrical short. 2. Drive board components have an electrical short. Replace the drive board. 1. Inspect the motor for abnormalities. 2. Replace the drive board. 3. Replace the motor. 1. Inspect whether the main power voltage is too low. Normal is 110V or 220V +- 10%. 2. Inspect whether the walk belt is too tight. 3. Inspect the walk belt for wear. Lubricate or replace it. 4. Inspect the condition of the fuse holder and fuse. 5. Replace the drive board. 6. Inspect motor brushes. Do not put the safety key in place. Press and hold the <CHANGE> key for three seconds. The program IC version, metric/imperial unit selection, total distance, total time,and user id on/off setting appear replace 1.VR 2. Drive board 1.Running belt 1. Drive board 1. Motor 2. Drive board 1. Walk belt 2. Drive belt 3. Drive board Notes

19 2-1. Electronic Malfunction Troubleshooting Table T611 Malfunction Circumstance Inspection and test points Components to Telemetry heart rate malfunction No heart rate reading, please check transmitter 1. This error statement appears when the display IC does not receive the HRC signal. 2. Inspect whether the heart rate transmitter strap is fastened securely. 3. Replace transmitter strap batteries or the transmitter strap itself. replace 1. Heart rate transmitter Notes 2-1-4

20 Troubleshooting Model: T611 Malfunction: Safety key malfunction Circumstance: Put the safety key in place. The display shows no reaction. Safety key appears. Possible cause: Safety key board malfunction Troubleshooting: 1. Inspect the safety key magnet. 2. Inspect bridge board connections. 3. Test or replace the safety key board. Safety key cable Display Board Safety key board Bridge board Safety key board Safety key reed switch test Put safety key Reed switch: electrical magnet in place continuity Do not put the Reed switch: electrical safety key magnet open in place ON OFF 3-1-1

21 Troubleshooting Model: T611 Malfunction: No start up. Unit does not operate. Circumstance: Turn unit power on. The power indicator does not light. Possible cause: Incoming power supply or component malfunction. Troubleshooting: 1. Inspect the power cable connection. 2. Inspect cable connections under the motor cover. 3. Inspect the main fuse, fuse holder, and power switch. 4. Inspect the drive board components for signs of burning. Or replace the drive board as a test. Drive board Display board AC1 AC2 FUSE SW Filter Drive board Inspect the main fuse, fuse holder, and power switch

22 Troubleshooting Model: T611 Malfunction: No start up. Unit does not operate. Circumstance: Turn unit power on. The power indicator does not light. Possible cause: 1. AC power supply enters the drive board, goes through the fuse, into the transformer, then into the drive board. 2.Cables are not connected properly, or the drive board is malfunctioning. Troubleshooting: 1. Inspect all cable connections. 2. Inspect whether LED2 on the drive board lights. A. If LED2 does not light, inspect the transformer fuse and measure transformer input and output voltages. 3. Inspect whether LED1 on the display board lights. A. If it does not light, inspect cable connections from the display to the drive board. B. If it does light, inspect the display IC. Re-install the display IC. LED2 VCC power LED1 Display board LED1 power indicator Lit indicates incoming 5V power supply. Program IC Inspect the transformer fuse AC1 AC2 Transformer FUSE Drive board LED2 Transformer voltage Transformer VAC (red-red) (blue-blue) 110V (red) 220V(blue) black-black 12.5V white-white 12.5V orange-orange 29V yellow-yellow 11.5V 3-2-2

23 Troubleshooting Model: T611 Malfunction: Telemetry heart rate malfunction Circumstance: Telemetry heart rate malfunction Possible cause: 1. Transmitter battery voltage is too low. 2. Telemetry receiver board malfunction 3. Environmental interference, possibly from lights or speakers Troubleshooting: 1. Replace the transmitter strap or its batteries. 2. Inspect the receiver board wire connection. 3. Replace the receiver board. Telemetry heart rate receiver board HR LED Display board Heart rate receiver Telemetry transmitter (battery location) Transmitter 3-3-1

24 Troubleshooting Model: T611 Malfunction: Key malfunction soft keys Circumstance: Press display keys. Display shows no reaction, or keys operate continually. Possible cause: 1. Bridge board soft key connections are not connected properly. 2. Soft keys are bad. Troubleshooting: 1. Inspect bridge board soft key connections. 2. Replace soft keys. Display board Soft key connection Bridge board Soft key 3-4-1

25 Troubleshooting Model: T611 Malfunction: Incline does not operate up or down. Circumstance: Press incline keys. Incline does not operate up or down. Possible cause: 1. Cables are not connected properly. 2. Drive board or VR malfunction. Troubleshooting: 1. Inspect all cable connections. 2. Measure whether transformer incline voltage is 29 VAC. 3. Inspect whether incline UP/DN indicators light when incline keys are pressed. If LEDs do not light, inspect cable connections and the display. If LEDs light, inspect whether the drive board emits voltage to the incline. If yes, the incline is defective. If not, replace the drive board. Measure incline VR voltage (red-green wires) 0% 1.20V 15% 3.57V Display board Transformer Drive board VR sets Measure voltage from the transformer to the incline orange-orange 29 VAC Incline up/down indicators Test incline motor voltage: white-green 40V or -40V Incline motor Incline gear box Incline VR set 3-5-1

26 Troubleshooting Model: T611 Malfunction: Incline position malfunction Circumstance: The incline setting and actual incline position differ. Possible cause: 1. VR wear 2. Display board incline setting circuit malfunction Troubleshooting: 1. Inspect all cable connections. 2. Measure VR wires to the drive board: red-green 0% 1.20 VDC 15% 3.57 VDC If not, re-calibrate the incline set. 3. If the VR voltage fluctuates greatly, the VR set is broken. Replace the VR set. 4. If the VR voltage is correct, replace the display as a test. Display board Inspect the display cable connections and program IC Measure incline VR voltage (red-green wires) 0% 1.20 V 15% 3.57 V Drive board Incline VR set VR sets Incline motor 3-6-1

27 Troubleshooting Model: T611 Malfunction: HTR malfunction Circumstance: Contact heart rate (HTR) value malfunction Possible cause: 1. HTR cable malfunction 2. HTR board malfunction 3. Display cable connection malfunction Troubleshooting: 1. Inspect the display cable connections. 2. Inspect bridge board HTR cable connections. 3. Inspect contact heart rate cable connections. 4. Inspect HTR board LEDs. 5. Replace the HTR board. HTR cable connection Display board HTR HTR cable connection Bridge board HTR board HTR board HTR contact plate (clean here) Bridge board SENSOR-R SENSOR-L 3-7-1

28 Troubleshooting Model: T611 Malfunction: The fuse has broken. Circumstance: Turn on unit. The fuse immediately blows. Possible cause: 1. Components and the frame have an abnormal electrical short. 2. Drive board component malfunction Troubleshooting: 1. Inspect the power cord. Is the cord insulation broken and creating an electrical short? 2. Replace the drive board as a test. (Drive board malfunctions are the most common source of blown fuses.) 3. Replace the filter. Drive board AC1 FUSE SW Filter Drive board Fuse and power switch AC

29 Troubleshooting Model: T611 Malfunction: The fuse has broken. Circumstance: Press the speed key. Motor rotates. Fuse blows. Possible cause: 1. Motor has an abnormal, internal electrical short. 2. Drive board malfunction Troubleshooting: 1. Replace the drive board as a test. 2. Replace the motor as a test. 3. Replace the optic sensor as a test. Display board Drive board Sensor Motor Drive board Sensor Motor 3-8-2

30 Troubleshooting Model: T611 Malfunction: The fuse has blown. Circumstance: After a period of use, the fuse suddenly breaks. Possible cause: 1. Fuse holder malfunction 2. Deck or belt wear 3. Drive board malfunction Troubleshooting: 1. Inspect the fuse and fuse holder installation. 2. Inspect the mechanics: A. Walk belt wear, lubrication B. Inspect walk belt tightness. Is it too loose? 3. Replace the drive board as a test. 4. Inspect the motor brushes. Drive board Motor Display board Drive board Sensor Motor 3-8-3

31 Troubleshooting Model: T611 Malfunction: Error 1 Malfunction: Press the speed key. Speed engages. Before the motor rotates, Error 1 appears. Possible cause: 1. Motor does not rotate. Drive board or motor malfunctions. Troubleshooting: 1. Inspect all cable connections. 2. Inspect the display board IC connection. 3. Measure motor voltage from the drive board. Is there voltage across M+,M-? If not, replace the drive board. If so, A. inspect transformer output voltage. B. inspect whether the EMG LED lights. C. Do IGBTs have an electrical short? 4. Inspect motor brushes and commutator. Display board Measure motor M+,M- voltage Inspect motor brushes Transformer Drive board Measure transformer voltage Sensor Motor EMG indicator 3-9-1

32 Troubleshooting Model: T611 Malfunction: Err 1 Circumstance: Press Speed key. Motor rotates. Err1 appears. Possible cause: 1. Motor rotates optic sensor malfunctions Troubleshooting: 1. Inspect all cable connections. 2. Inspect whether CLK indicator on drive board flashes. If not, optic sensor is malfunctioning. Suggestion: A. clean the optic sensor sensor head. B. replace the optic sensor. 3. If the CLK indicator lights, inspect: A. cable connections B. main IC connections. Inspect the display cable connections and the IC connection. Display board CLK indicator Inspect the optic sensor Drive board Motor Motor Sensor Inspect motor brushes 3-9-2

33 Troubleshooting Model: T611 Malfunction: Err 3 Circumstance: Display speed and actual speed differ. Possible cause: 1. Optic wheel teeth or optic sensor malfunction 2. Drive board malfunction Troubleshooting: 1. Inspect whether optic wheel teeth are missing. 2. Replace the optic sensor as a test. 3. Replace the drive board. Display board CLK indicator Drive board Sensor Motor

34 Troubleshooting Model: T611 Inspect the display cable connections and program Malfunction: Err 7 IC connections. Circumstance: Display shows ERR 7. Possible cause: 1. Drive board or VR malfunction made the incline stick at highest or lowest level. Troubleshooting: 1. Turn on unit power. Do not press any keys. Inspect drive board incline indicators LED5 and LED6. A. If LED5 or 6 lights, either the display or cable connections are at fault. B. If not lit, inspect whether the drive board emits voltage to the incline motor. If LEDs do not light, replace the drive board. Incline up/dn If LEDs light, recalibrate the incline motor and VR indicators Or replace the VR. Incline voltage from drive board: Display board +40V or -40V. VR wires red green: 0% = 1.20V Drive board VR Incline sets motor If the incline exceeds range, recalibrate incline set

35 Troubleshooting Model: T611 Malfunction: ERR 10 Circumstance: The walk belt suddenly rotates quickly. Possible cause: 1. Drive board IGBT has an electrical short. The protective circuit fails. 2. The protective circuit fails, prompting the error code. This cause is unlikely. Malfunction: 1. Replace the drive board. 2. Inspect the optic sensor. IGBT Display board Optic sensor Drive board Drive board Sensor Motor

36 Troubleshooting Model: T611 Malfunction: SERVICE REQUIRED TREADMILL SHUTTING DOWN STOPPING Circumstance: Display shows SERVICE REQUIRED TREADMILL SHUTTING DOWN STOPPING, the motor overheat error. Possible cause: 1. Motor is excessively hot; overheat protective circuit operates. Troubleshooting: 1. Inspect the motor thermal switch and fold-up switch cable connections. (These two cables are connected.) 2. Inspect the motor cover. Is it hot? 3. If it is hot and the unit has been in use for a long period of time, the motor overheat protective function is operating. Turn off the unit. Let it sit without use for half an hour. M-TEMP LED 4. If ERR14 often appears, please lubricate the walk belt and deck. If the belt is worn, replace it. 5. If replacing the walk belt does not remedy the situation, the motor is suspect. Display board Motor thermal switch cable Drive board Thermal switch Motor

37 Other Topics Model: T611 Item: KPH/MPH unit selection, USER ID ON/OFF, total distance, total time, display board/drive board program versions Method: 1. Do not put the safety key in place. Press and hold the <CHANGE> key for three seconds to enter the basic parameter setting mode. 2. KPH/MPH setting Display shows UNIT-MPH (Imperial standard) or UNIT-KPH (Metric standard). Press the INCLINE< > or < > key to toggle between MPH and KPH settings. Press the <ENTER> key to confirm your choice. 3. USER ID ON/ OFF setting Display shows USER ID ON or USER ID -OFF. Press the INCLINE< > or < > key to setting USER ID ON/OFF. Press the <ENTER> key to confirm your choice. 3. Distance Display shows total distance as DIST-XXXXXXKM.(Or DIST- XXXXXXX MI). Press the <ENTER> key to proceed to the next view. 4. Time Display shows total time as TIME-XXXXXXHOUR. Press the <ENTER> key to proceed to the next view. 5.Display board program version Display shows the display board program version. Press the <ENTER> key to proceed to the next view. 6.Drive board program version Display shows the display board program version. Press the <ENTER> key to proceed to the next view

38 Other Topics Model: T611 Item: Error Code Table E-1 : Display board main program has not received the optic sensor signal. E-3 : Display setting and actual speed differ. E-7 : The display detected that the incline VR voltage is too high or too low, indicating that the incline is stuck in the wrong position. E-10 : The motor suddenly sped up

39 Inspection and Measurement Inspection point: T611 optic wheel, optic sensor Inspection method: 1. Inspect the optic wheel placement. The optic wheel should rotate in the center of the optic sensor. It should not touch the optic sensor. 2. Inspect whether optic wheel teeth have broken. 3. Pull the walk belt to allow the optic wheel to move. Inspect whether LED7 on the drive board flashes. When a tooth of the optic wheel is in the center of the optic sensor, LED7 on the drive board does not light. When a tooth of the optic wheel is not in the center of the optic sensor, LED7 on the drive board lights. 4. The optic sensor includes an infrared transmitter and a receiver. Inspect whether the optic sensor is dirty. If so, wipe it clean. Optic sensor LED7 optic sensor signal indicator Optic wheel 4-1-1

40 Inspection and Measurement Inspection point: T611 transformer Inspection method: 1. Inspect whether the transformer fuse has blown. 2. Measure transformer voltage. 3. Set the multi-meter to the AC setting. Place probes as follows: Transformer fuse Transformer cables Voltage red-red or blue-blue (input voltage) 110V (red)/220v(blue) black-black (normal power) 12.5V white-white (normal voltage) 12.5V orange-orange (incline voltage) 29V yellow-yellow (normal voltage) 11.5V Transformer connector 4-2-1

41 Inspecting and Measuring Inspection point: T611 motor brushes Inspection method: 1. Inspect motor brushes. A. Inspect brush length. If brushes are shorter than 0.7mm, replace the brushes. B. Inspect the brush surface. It should be smooth. If there are grooves, the commutator might be faulty. C. Inspect whether brush copper wires have changed color. If so, replace the brushes. Motor brushes Brush length should exceed 0.7 mm. This image shows brushes that are too short. If copper wires have changed color, connections are bad. Replace the brushes. Brush ends shown here have scratches, a sign of irregular wear. Replace brushes like these. Motor brushes 4-3-1

42 Inspection and Measurement Inspection point: T611 motor voltage test at the drive board Inspection method: 1. Select the VDC setting on the multi-meter. Place probes on M+M- connectors on the drive board. 2. Press the SPEED< > key. The motor should operate, allowing you to measure motor voltage. Speed Drive board voltage Motor specifications Highest speed VDC 110V Lowest speed VDC 220V 4-4-1

43 Inspection and Measurement Inspection point: T611 incline voltage measurement at the drive board Inspection method: 1. Do not press any key. Incline indicators do not light. The drive board does not emit voltage to the incline motor. The incline motor does not operate. 2. Select the VDC setting on the multi-meter and test as follows. Incline key Indicator on drive board Drive board incline voltage Incline operation INCLINE < > LED5 lights (DOWN) green-white +40 or -40V Incline operates down INCLINE < > LED6 lights (UP) green-white +40 or -40V Incline operates up Incline motor connection on drive board Incline indicators (LED5 LED6) on the drive board 4-5-1

44 Inspection and Measurement Inspection point: Measuring VR voltage on the drive board Inspection method: 1. Select the VDC setting on the multi-meter. Place probes on the VR set red-green wires. 2. If the VR voltage fluctuates widely, the VR is bad. Replace it. Incline key Drive board VR voltage Incline position 0% Red-green 1.20V At red line (calibration point) 15% Red-green 3.57V Longest position Incline VR connector at the drive board Incline red calibration line 4-6-1

45 Inspection and Measurement Inspection point: Incline motor and VR calibration Inspection method: I. Calibration goals Adjust the incline set tube to the red calibration line. Adjust the VR voltage across red and green wires to 1.20V. II. Calibration steps: Step 1. Adjust the incline tube to the red calibration line as follows: A. Remove VR set screws. Remove the VR cap. B. Rotate the VR to set voltage across red and green wires to 2.5V. C. Press the INCLINE< >/< > keys to operate the incline up or down, making the incline tube return to the red calibration line. Step 2. Adjust the VR voltage across red and green wires to 1.20V. A. Rotate the VR to set voltage across red and green wires to 1.20V. B. Use screws to secure the VR cap back into place. Step 3. When calibration is complete, test incline operation as follows. A. Press the Incline< > key. The incline should operate to 15%. Measure incline VR voltage. It should be 3.57V. B. Press the Incline< > key. The incline should operate to 0%. Measure incline VR voltage. It should be 1.20V. Incline red calibration line Incline position Incline set Incline VR Treadmill position 0% 15% At red calibration line At longest point 1.20V 3.57V Level position Highest position VR voltage adjustment 4-7-1