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If the drive motor (and running belt) does not rotate at all, the problem is more difficult to
diagnose. First, suspect the power relay and check it by going into diagnostics, C18, and
press the v elevation button in conjunction with the SPEED + button. This will toggle the relay
on/off. You should be able to hear the relay toggle and note as well that the value in the
center window reads “1.” If it reads zero, the problem is most likely the console cable.
If none of these prove to be the problem, have a qualified service technician check the wiring
for wear or abrasion and also inspect the motor brushes. Any arcing, pitting or burning of the
brushes, or a brush that is less than .438” (7/16"/11.13mm) indicates the need for brush
replacement. The tightness of the brush cap and brush holder mount in the drive motor
housing should also be checked. NOTE: There are two lower board fuses which allow power
to the display and to the motor drives. The upper display is not likely to light up at all if one or
both of the fuses need to be replaced. Have a qualified service technician replace these only
with equivalent value fuses.
ERROR 2: EXCESSIVE CURRENT DRAW
This error code is generated by exceeding the current limit of the motor drive system for two
seconds. The error is generated to help prolong the life of the treadmill and alert the owner
to a potentially damaging situation. Most common occurrences of this are high belt/deck
friction due to wear or contamination, a worn motor, or a breakdown of the choke. Problems
in the drive motor brush area, such as worn, pitted or arcing motor brushes, a loose drive
motor brush cap, or a loose drive motor brush holder can also cause this error code to
be generated.
Another source of this problem could be excessive friction between the deck and belt, usually
caused by a lack of routine belt/deck cleaning (see Chapter 5), or by a worn deck.
A third cause for this code could be a defective choke or a poor connection at the choke
assembly.
Last, the failure of an electronic component in the motor control or loss of magnetism in the
drive motor permanent magnet could also generate this error code.
ERROR 3: LOSS OF SPEED SIGNAL
This error code occurs after the treadmill has successfully started and indicates that the com-
puter in the display control panel has lost the motor speed signal from the speed sensor. The
causes for this error are similar to those listed for Error 1.
ERROR 50: OVERSPEED
This error code indicates a problem with the speed control circuitry. This error is stored as
ERROR 6 but displayed as ERROR 50.
It can occur if the treadmill recognizes a discrepancy in the actual belt speed vs. the speed
set at the control panel. If the actual speed of the belt is 1 mph (1.6 kph) over the set speed
for 0.2 seconds or 2 mph (3.2 kph) below the set speed for 2 seconds, this error code will be
displayed.
Cybex 710T Treadmill Owner’s Manual
Page 7-12