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This happened to me and I took the wheel mechanism cover off to discover the tension motor cable had come out of it's pulley guide- so there wasn't enough tension left in the cable to pull it away from the wheel- quite an easy fix for me- hope it is the snake for you!
1. Sounds like you need a new keypad if some buttons do not work. 2. If those buttons do not work either, it sounds like you need a new keypad, possibly the upper board. Make sure the keypad is plugged into the upper board and the connection is not corroded. 3. Older 546s used an electromagnet to produce resistance, newer 546s use a generator and resistor to produce resistance. I have never seen a 546 that used a motor that moves back and forth to produce resistance. Some residential crosstrainers use a motor like you describe.
I have the same machine. There are 4 D cell batteries in a small drawer at the bottom of the console. The screw is located on the left hand side and is a bit awkward to get at. The drawer slides down from the middle of the console.
Normailly there are 2 system:
1) Manual, see the belt if there are defective,try to put a Little LUBE it,since has a LOT of mechanical stress. Replace it if Necessary.
2) The small motor in the system, can be faulty or broken, replace it.However test the batteries if the system have, clean the contacts batterys, with special liquid clean contacts cleaner, and tight very well the connector, and clean too.
If you can hear the adjustment motor running the problem could be related to two things: 1. Broken or stretched resistance adjustment cable. 2. Broken bracket for the magnet return spring. If the resistance is on maximum all the time the second issue is most likely the cause.