Precor TRM 811.v2, Service Manual

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2.
One of the upper PCA’s keypad interface chips has failed.
3. Liquid (perhaps perspiration) is present on the surface of the display overlay.
Possible Remedies
1. Remove the keypad connector cable from the upper PCA. Restart the power up sequence; if
Stuck Key is no longer present, the keypad is the cause. The keypad is typically part of the
display housing. Replace the display housing to correct the problem.
2. Remove the keypad connector cable from the upper PCA. Restart the power up sequence; if
Stuck Key is still present, the upper PCA is the cause. Replace the upper PCA to correct this
problem.
3. Wipe the surface of the display overlay clean of all liquid. Restart the power up sequence; if
Stuck Key is no longer present, the liquid was the cause.
Error 80, 81, 82, & 83
– P30/P80 Machine Controls Not Working
MCL
– Green
ASL
– Yellow Solid
Description
The main symptoms for these errors are lack of control for incline and speed (TRM) or
resistance and crossramp (EFX, AMT). These errors will occur upon “lack of” or broken
hardware communication. The sensors communicate through an 8-pin connection. Pins 1-3 are
incline controls; pins 6-8 are drive (speed or resistance) controls.

Error 80 - Incline (or crossramp) will stop at current incline. Error 80 is displayed when there is a
missing incline signal on pins 1 or 2.

Error 81 - Incline (or crossramp) will stop at current incline. Error 81 is displayed when there is a
missing incline signal on pin 3

Error 82 - Speed will decrease at 0.1mph per key press until belt stops. Error 82 is displayed
when there is a missing drive signal on pins 6 or 7

Error 83 - Speed will remain at current speed. Error 83 is displayed when there is a missing drive
signal on pin 8.
The most likely causes for these errors are a loose or disconnected connector to the upper PCA,
damaged cables, or a faulty machine control.
Possible Causes
1. Machine control interconnect cable has come unplugged or backed off slightly from the
upper PCA.
2. Bad machine control cable.
3. Bad machine control assembly.