Sportsmith Blog
29May/120

How to Adjust Chain Tension for a Schwinn IC Bike

Video Demonstrating How to Adjust Chain Tension for a Schwinn IC Bike

  • This video will demonstrate the chain tension procedure on a Schwinn IC bike
  • Tools required:
  • 15mm Wrench
  • 10mm Wrench
  • 4mm Allen Wrench
  • Although the tension is set at the factory over time the chain may loosen and need adjustment
  1. To inspect the chain tension, remove the chain guard
    • Use a 4mm Allen wrench to remove the 3 screws as shown in the video
  2. Turn the pedal to the 3 o' clock position (as shown in the video), then grasp the chain guard and move it back past the tab at the back of the chain guard
  3. Place the pedal in the 9 o' clock position and you can remove the chain guard as demonstrated in the video
  4. Test the chain for 3/16" of deflection
    • If adjustment is needed, loosen the nuts on each end of the axle with a 15mm wrench
  5. Now using a 10mm wrench, make equal adjustments to the bolts that stick through the frame at the front of the cycle
    • Then retest the deflection
    • Make small adjustments until the proper 3/16" of deflection is achieved
  6. Tighten the axle bolts and replace the chain guard
  7. This completes the procedure of adjusting the chain tension on a Schwinn IC bike
3May/120

Stairmaster Steppers C40 Console Repair

C40 Console Repair Video Demonstrating Replacement of the PCB and PCBA for Stairmaster Steppers

  • This video demonstrates the steps necessary when replacing the PCB and/or PCBA in order to repair a C40 console used on Stairmaster steppers
  • This procedure applies to the following models:
  • 7000PT Stepmill
  • 4400PT
  • 4400CL
  • 4600PT
  • 4600CL
  • To begin changing the console boards on your machine you must first remove the console from the machine. You will need to disconnect the main cable harness and remove the four screws that hold the console to the frame
  • Once you have removed the console from the machine you need to remove the six screws from the back of the console. After the screws are removed you can carefully separate the two pieces a bit and see the two cables that connect the two panels as shown in the video. These two cables must be disconnected before you can separate the back panel from the front
  • The ribbon cable that connects the two boards must be removed by separating the connector as shown in the video and then carefully lifting the ribbon off the connector. Once you have successfully removed the cable that connects the two boards (PCB and PCBA), you can flip the panel up slowly as shown in the video enough to see where the keypad ribbon connects to the PCB. Carefully remove the keypad ribbon from the connector on the PCB. Now you can fully separate the two panels
  • At this point you can access the boards to replace the one giving you issues. For instance if you have diagnosed the console as having a bad PCBA you can now replace that board by removing the four screws that attach it to the panel. Then carefully remove the board
  • To install the new one carefully line up the holes and replace the screws as seen in the video
  • If you have determined the PCB as the problem you will remove the five screws attaching it to the panel and then carefully remove the board as shown in the video
  • Before installing the new PCB to the panel you will want to make sure that the interconnect cable is connected fully and connected to the proper connector as shown in the video. If they cable is connected to the wrong connector it will not power up or work at all. This is a common mistake when replacing the board/s
  • Now replace the board and screws
  • Then you can re-assemble the console, but be sure to connect the cable and ribbon fully and to the correct connector. It may help to stand one panel up next to the end where the keypad ribbon goes from the keypad to the PCB. Then plug in the interconnect cable that connects the PCB to the PCBA as seen in the video
  • Place the 2 panels together and replace the screws. The Longer screws go in the bottom portion of the console and the 2 shorter screws go in the top part of the console. Once the screws are replaced you can install the console to the machine
  • Be sure to connect the main cable assembly to the back of the console and be certain the cable is fully connected with the tabs in the locked position as shown in the video
  • This concludes our example of how to replace a PCB or PCBA when repairing a C40 console found on steppers by Stairmaster