GE T2100, Service Manual

Page: 56 / 152

5-6 GE T2100 Treadmill Revision A
2021403-031
Theory of Operation: Power Board (PCB) Theory
Elevation Sensor
The elevation sensor is a 5-turn pot that is coupled to the elevation rack.
The voltage on pin 2 should be proportional to elevation. That is, low
voltage should be low elevation, increasing voltage should indicate
increasing elevation. During self-calibration, the offset and gain remain
in software memory. Initially, the limit switch positions are the reference
for self-calibration. Once the offset and gain are adjusted, the pot
position determines the elevation.
ESD and EMI Compatibility
The I/O connectors on the power board have current-limiting resistors,
Zener diodes, or filtering capacitors wherever possible to prevent EMI
from escaping the board. These components also limit rise-time and
voltages which may come from ESD or other noise sources.