E-2. Troubleshooting And Repairs; E-2.1 Replace Strain Gauge; E-2.2 Replace Pcb Rpm - GE eBike Service Manual

E-2. Troubleshooting and Repairs
The following components of the drive unit are available as spare parts for replacement.
- Service Kit: Strain gauge, elastic element, complete kit
- Service Kit: Return spring with micro rope, complete kit
- Service Kit: PCB RPM, complete kit
E-2.1. Replace Strain Gauge
Before replacing the strain gauge, check whether one of the micro ropes is disengaged (you have to
remove the housing first) or whether the prestress spring is excessively strained.
The complete strain gauge must always be replaced.
- Disconnect cable connecting strain gauge to PCB RPM and remove strain gauge.
- Remove sealing varnish, then take off the micro ropes.
- Remove clamping plate.
- Replace strain gauge; reverse above steps to reassemble.
- Hang the micro ropes and screw the strain gauge tight.
- Connect strain gauge to PCB RPM.
Caution:
The safety ball of the micro rope must not touch the rubber layer of the strain gauge (risk of
destruction).
Caution:
After replacing the strain gauge, repeat weight calibration (torque calibration) of ergometer.
E-2.2. Replace PCB RPM
Disconnect the following cables before replacing PCB RPM:
- cable to strain gauge
- cable to power supply and RS232 interface
- cable to eddy-current brake
Caution:
After replacing PCB RPM, repeat weight calibration (torque calibration) of ergometer.
2018112-003 Rev J
E: Drive Unit
eBike, eBike L, eBike EL - 67 -