C842, C842i, C846, C846i Upright and Recumbent Cycle
Page 31
Procedure 6.4 - The RPM Display is Incorrect
1. For C842, C842i, C846i and C846 version 2 units, skip to step 8. For C846 version 1 units,
continue with step 2.
2. Set the on/off switch in the “on” position. Use the
Quick Start
key to enter the manual
program. Use the
Change
to set the display to read RPM. Using a watch or clock as
reference, pedal the bike at a rate of one revolution per second. The display should indicate
approximately 60 RPM. If the RPM reading is missing or significantly low continue with step
2. If the reading is significantly high, replace the reed switch.
Diagram 6.7 - Speed Sensor, C846 version1
3. Connect a DC voltmeter across resistor R25, See Diagram 6.5, and pedal the bike for a
minute. Stop pedaling the bike. Slowly rotate the secondary pulley by hand until the magnet
mounted on the flywheel passes the speed sensor. The DC voltmeter will read 0 Vdc when
the magnet is away from the speed sensor and 5 Vdc when the magnet is near the speed
sensor. If both voltage readings are correct, skip to step 5.
4. If either voltage reading in step 2 was incorrect, set the on/off switch in the off position.
Connect an ohmmeter across capacitor C24, See Diagram 6.5, and pedal the bike for a
minute. Stop pedaling the bike. Slowly rotate the secondary pulley by hand until the magnet
mounted on the flywheel passes the speed sensor. The ohmmeter will read open (
∞)
when
the magnet is away from the speed sensor and approximately 100
Ω
when the magnet is
near the speed sensor. If both ohmmeter readings are correct, skip to step 5.
Reed
Switch
Magnet
