Troubleshooting
Model: C520R/C531R
Malfunction: Excessive resistance
Circumstance: Pedal the bike; resistance is excessively heavy.
Possible causes: 1. There is an electrical short in the cables.
2. Drive board components have an electrical short.
Troubleshooting: 1. Inspect all cable connections. Inspect cables for damage.
2. Inspect drive board power components for a short.
3. Replace the drive board.
3-5-1
Drive
board
Display board
Electro-
magnet
Inspect IGBTs for a short