Start by confirming the proper voltage output from your power supply. It should be outputting 12-19 volts DC.
Repair Parts for Stairmaster Equipment Batteries Springs Belts Chains...
Stairmaster 2 Pin Power Supply with Metal Connector SPORTSMITH net
Video about Multimeter Testing
SOURCE: stairmaster climber model 4600 pt pedals go all
Unplug dc power connection then remove right side panel check for loose connections on on alternator, check distance of speed sensor to speed sensor disc you should no more than 3 credit card distance between them. Next remove the black wire from the B+ terminal on the alternator, then remove the brown wire from the field terminal on the alternator.Place a short wire with alligator clips between B+ and field terminals start stepping for about 10 to 15 second you should full resistance in that case its the upper console that if not replace alternator
SOURCE: Stairmaster freeclimber 4400 pt will
Remove console knobs form the back of the console, lift the up, and disconnect the 20 pin cable from the console. Get a multi meter go to dc volts 100v range. On the connector you will be testing for 12 to 19 volts. When Looking at the connector the connector nipple should be pointing left starting form the bottom left odds numbers right bottom even you will hunt for pin 1 Neg pin 10 Pos. If all voltage readings are within 12 to 19 volts and the console is not powering up , then either replace or have the console repaired.
National Gym Parts can help with process go to http://www.gympart.com/
SOURCE: My Stairmaster 4000 PT pedals
have diode on the alternator checked , check all wiring connections to be tight, is the battery ok (6 volts ) and last check the motor control board for damage and/or electrical burn
SOURCE: where can i find the power supply for stairmaster
contact sportsmith fitness products you can find them on the interenet
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