Stairmaster 4000 PT series, Owner'S Manual

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Tach Test
If you do not have resistance, perform the tach test. The tach test will tell you
the tach signal, in revolutions per minute (RPMs), picked up by the console.
1. Press [ LEVEL: ^ ], [ 6 ], [ 6 ], [ENTER]. The console will display
“TAR TACH ACT.” The target tach speed of 2,000 RPMs will be shown
in the upper left corner of the display window. The actual tach picked
up by the console will be shown in the upper right corner of the
display window.
2. Start stepping on the pedals. The number in the right hand corner of
the console should increase to 2,000 RPMs (+/- 200). If the tach signal
picked up by the console is less then 1,900 RPMs then there is a
problem in the AC tach circuit - either with the console software,
alternator (check the AC tach wire, the field wire, the diode, and the
terminal posts), or the main cable.
Error Reporting
The console will display various error messages in the display window. The
total amount of errors will be displayed in the upper right numeric window.
Note that only the highest priority reported error will be displayed. Errors are
handled in two ways. One as a non-fatal “WARNING” which will display the
text message but continue system operation until the user presses the [CLEAR]
key. The second way is as a fatal “ERROR” which will stop the exercise and
return the system to an idle intensity state. The console will display the error
text and not let the user restart the programs unless power has been turned
off and then back on.
The following microprocessor errors require a console replacement;
ALU ERROR, TIMER ERROR, and STATIC RAM ERROR.
Resetting the power may clear the following microprocessor errors;
EEPROM ERROR, and PROGRAM ERROR. If resetting the power doesn’t work,
the console may need to be replaced.
CONSOLE DIAGNOSTIC TESTS