Dynamic Brake Thermal Switch; Diagnostics And Indicators; Motor Controller Light (Mcl) Service Status Indicator; Active Status Light (Asl) Led - Precor TRM 885.v2 Service Manual

Dynamic Brake thermal switch

As long as the thermal switch is open the console will show the "use another treadmill" message.
The treadmill cannot be used when the DB resistor is overheated causing the thermal switch to
open. When the DB resistor cools enough to allow the thermal switch to close the treadmill will
return to normal operation. A broken wire will exhibit the same symptoms as an open thermal
switch.
The DB resistor is only self-tested on power up. If it is not working correctly an error 85 is triggered
but the treadmill will continue to operate normally except if the DB resistor is required. In this case
the buss voltage can increase to an over voltage condition causing and an error 15 to trigger and
the treadmill to stop.
The thermal switch contacts are easily spread and damaged by inserting meters probes while
testing. This can cause intermittent connector electrical contact. If this occurs the DB resistor
assembly will need to be replaced.

Diagnostics and Indicators

Motor Controller Light (MCL) Service Status Indicator

The MCL is a tri-colored LED showing service status, used to indicate an error condition
within the MC. Currently only two colors are used – Green indicates no problems with the
MC, Yellow indicates that an error has occurred, and diagnosis should be performed.
The console is in charge of setting the LED state; the MC will not change the LED state unless it is
requested by the display.
The MC will remember the status even after a power cycle. It can only be reset via the console
through the diagnostics menus.
The LED status is used to check the drive's status when it is returned to the factory.
Status and error tracking data is stored in non-volatile memory. This provides information on recent
operation and error in the drive. This is like 'black box' type of recorder for the drive.

Active Status Light (ASL) LED

The ASL is visible on the front of the treadmill and will indicate the status of the treadmill.
There are currently four states for the ASL – Blue solid, Blue Flashing, Yellow Solid, and
Yellow Flashing. These are described in detail in the Troubleshooting section.
The ASL is microprocessor controlled, and located on a PCB mounted to the front of the
treadmill. The ASL will show blue at bootup. Communication between this board and the
MC is via a four pin cable with RJ11 type connectors.
The console will determine, through the MC, what color will be displayed.
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