GE T2100, Service Manual

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5-14 GE T2100 Treadmill Revision A
2021403-031
Theory of Operation: Processor Board (PCB) Theory
subsystem by asserting EN_ELEV signal on J9 and, based on the actual
elevation status, assert/de-assert the UP/DOWN* signal on J9 until the
requested elevation is achieved. The elevation range is from 0 to 25%
grade.
Speed Control
The host will send a speed command "SXXX0<CR>" to the processor
board, the firmware in the micro controller will translate this command
into a data frame, It will enable the drive if it is not already enable at
this moment, and will send the frame through its drive serial interface.
The drive will interpret the data frame and will answer with data ACK
or NACK depending on the transmission condition. The speed range is 0
to 13.5 MPH.
Self-Calibration
Press and hold the self-calibration pushbutton (located on the connection
panel). Power up the treamill and continue to hold the Calibration button
until the GE T2100 Treadmill starts to elevate (approximately 4
seconds).
ESTOP
In order to operate the GE T2100 Treadmill, the ESTOP plug must be
attached to its receptacle on the processor board. Failure to perform this
action will initiate a RESET* sequence on the microcontroller disabling
any further power up sequence. Verify that the ESTOP switch is not
activated. Failure to verify this condition will cause the GE T2100
Treadmill to not operate.
Precautions
The board must be powered before signals are applied to it.
The circuitry is static sensitive. Therefore, when removing or installing
boards, the power should be Off.
The circuit board should not be supplied with an isolated VCC over 5.5
volts on the isolated side.