Precor Error Code 56 Brake (Magnet) / Resistance Current Low HW

Mar 19, 2022

Applies to Consumer EFX200/400, SCL800

Issue symptoms

EFX200/400

Error 56 indicates the LPCA has lost communication with the DC motor assembly, which controls the magnetic brake assembly. The magnetic brake will remain at the last position successfully set by the DC motor, so the resistance applied by the brake will not change until new instructions are successfully received and executed by the DC resistance motor, even if the machine is set to OFF.

After reestablishing communication between the LPCA and DC motor assembly, it may be necessary to power cycle the machine for the error to clear and for the DC motor to move the magnetic brake assembly.

SCL800

The LPCA detected that the resistance brake current is too low. This means the resistance brake current is too low to properly slow the stairs and will result in the Hold Brake engaging. The error will mostly likely be caused by a faulty/damaged resistance brake coil or a faulty/damaged component or circuit on the LPCA.

This Error can only be detected while the stairs are moving in a workout and recovers as soon as the stairs stop.

Troubleshooting steps

EFX Trouble Shooting

1. Check the cable and connections at the LPCA and DC motor to ensure they are properly seated and undamaged. If the cable or connections are damaged, repair or replace the damaged part(s).
2. : With the equipment ON, enter a manual workout and pedal the EFX. Using a DC voltmeter, place the red lead on the brown wire, and the black lead on the black wire. The meter should read +4.9 VDC when resistance is increased, and -4.9 VDC when resistance is decreased. If these readings are significantly out of range, recheck the wire harness. If still significantly out of range, replace the LPCA.
3. With the equipment ON, use a DC voltmeter to measure between terminals 1 and 3 on the JK8 connector that is located below the DC motor assembly. If a constant 5 VDC is present, replace the DC motor assembly. If voltage is significantly out of range, check terminals 1 and 3 at the LPCA for 5 VDC. If voltage is in range at LPCA, replace the wire bundle. If voltages are significantly out of range, replace the LPCA.
4. Check the function of the DC motor potentiometer by reconnecting the JK8 connector located below the DC motor assembly. Place the black lead on the frame ground screw, and the red lead on the orange wire of the potentiometer. At resistance level 1, the measurement should be approximately 0.17 VDC. The voltage will gradually increase at each resistance level, with a maximum voltage of approximately 3.9 VDC at resistance level 16. If the readings are significantly high or low, check wires and connectors for damage. If readings are still significantly high or low, replace the LPCA.

SCL Trouble Shooting

The error will mostly likely be caused by a faulty/damaged resistance brake coil or a faulty/damaged component or circuit on the LPCA.

1. Make sure the resistance brake cable is properly connected to the LPCA.
2.  Unplug the eddy current or resistance brake assembly cable connection from the LPCA.
   1. Inspect the eddy current (or resistance) brake coil wires for visual wire damage. Replace brake assembly if damaged.
   2. Use the eddy current brake cable connector to measure the resistance through the eddy brake coil. If infinite resistance (open circuit) or zero resistance (short circuit) replace the eddy current brake assembly.
3. Replace the LPCA.