Processor Board (Pcb) Theory; General Description; Power Distribution; Clock Generator - GE T2100 Service Manual

J13 AC Power to +24V Power Supply (cont'd.)
PIN #
J13–3
J13–4
J14 Power Cable to Processor Board
PIN #
J14–1
J14–1
J14–1

Processor Board (PCB) Theory

General Description

The processor board and power board function together to control the T2100
Treadmill. The processor board contains the following:
• Micro-controller CPU circuitry (MC9S12DG128)
• Flash Memory (calibration/history data)
• Temperature sensor
• Serial control links
• I/O circuitry
The I/O circuitry receive inputs from a stress system controller along with feedback
from the T2100 Treadmill sensors to control the elevation and drive relays located on
the power board.

Power Distribution

The processor board receives two sources of 5-volt power from the power board: an
isolated supply, and a non-isolated supply. Bypass caps distributed across the board
minimize EMI and power supply noise.

Clock Generator

A 16.00 MHz oscillator in a colpitts configuration is used to provide the processor
clock. This configuration creates a small amplitude (1 Vp-p) sinusoid mounted on a
DC bias level to minimize EMI.
2021403-120F
NAME
NC
LINE
NAME
+5V ISO
ISOGND
+VUNREG
T2100 Treadmill
TYPE FREQ
IN/
OUT
NC
PWR OUT 50-60
Hz
TYPE FREQ
IN/
OUT
PWR OUT DC
COM OUT DC
PWR OUT DC
Theory of Operation
COMMENT
NC
Line Power Out
COMMENT
ISO Power Supply
ISO Ground Supply
ISO Power Supply
63