Stairmaster FreeClimber, Service Manual

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Page 10
4600/4400 CL - ELECTRICAL TROUBLESHOOTING
I. Section One -Testing With A Multimeter/Voltmeter
1. Check all wiring and connections; ensure that the inductive switch Molex and resistor Molex are not
reversed on the power supply board.
2. Check the battery voltage with your test resistor installed between the battery leads. The battery
voltage should be 6.1 VDC or greater.
3. Check battery DC voltage at power supply board at TP2 and TP6 (6.0 VDC).
4. Remove inductive switch Molex from power supply board and test AC voltage at pins 1 and 2
while stepping (
minimum 3.5 VAC).
5. Remove gray cable connector at power supply board. Check AC voltage at TP1 and TP2 on power
supply board while stepping (
minimum 3.5 VAC).
6. Reconnect the gray cable at the power supply board and remove console. Test AC voltage in pins 2
and 4 in the end of the gray cable while stepping (
minimum 3.5 VAC).
7. Ohm and cross check main cable.
8. Ohm load resistor (2.5 Ohms).
9. Perform the following positive output to field test:
Disconnect battery from power supply board.
Remove black wire from B+ terminal on alternator.
Remove brown wire from field terminal on alternator.
Place alligator clips on the B+ terminal and the field terminal of alternator
Run on machine for a few seconds.
If full resistance is achieved during this time, your alternator has correct current build up from
residual magnetism to field coil.
10. Replace the power supply board.