What to do if all controls are inoperative and the display is lit up without information on Jouan B4i?
If your Jouan Laboratory Equipment is displaying a lit-up display without information and all controls are inoperative, check the cables and connectors to the display. Also, verify the correct positioning of the EPROM and the microprocessor on the µP board.
Why my Jouan Laboratory Equipment is not starting, even though the controls are operational?
If your Jouan Laboratory Equipment fails to start, but all controls and the display are operational, the µP board power bridge may be broken down, requiring replacement of the µP board. Alternatively, the start switch might be defective, necessitating a keyboard replacement.
What to do if the lid lock solenoid test is incorrect in Jouan B4i Laboratory Equipment?
If the lid lock solenoid test is incorrect on your Jouan Laboratory Equipment, check the voltage applied to the solenoid terminals. If the voltage is not apparent or incorrect (far from 24 VDC), replace the mother board or the transformer. If the voltage is correct, the solenoid is likely faulty and should be replaced.
How to troubleshoot a tacho test failure on Jouan B4i?
If the tacho test is incorrect on your Jouan Laboratory Equipment, check for a signal at the input to the mother board using an oscilloscope or DC voltmeter. Pulses should appear every 12 seconds. If the pulses are absent or incorrect, replace the tacho. If the pulses are correct, replace the µP board. Also, manually check that the motor turns freely, as failure of the motor bearings could also cause this issue.
Why is the compressor test incorrect on my Jouan B4i?
If the compressor test is incorrect on your Jouan Laboratory Equipment (BR4i), check the voltage applied to the compressor terminals. If the voltage is not apparent or incorrect, change the control board. If there's no change, replace the mother board. If the voltage is correct (230 or 120 V depending on the version), replace the condenser and/or the compressor start-up relay. If there's still no change, the compressor coils may be faulty.
How to troubleshoot no power and no lights on Jouan B4i Laboratory Equipment?
If your Jouan Laboratory Equipment shows no control activity and no indicator lights are on, start by checking the mains outlet and power cable to ensure the centrifuge is receiving voltage. If that's not the issue, inspect the fuses (B4i models) for any short circuits. Disconnect the mains cable and use an ohm-meter to check for shorts, then reset or replace the circuit breaker as needed. For BR4i models, check the line differential's switching and the insulation between the mains and the earth of the centrifuge. Also, check for short circuits at the power level by disconnecting the mains wires at the µP p.c.b. If the short circuit persists, replace the µP board or the capacitor and check the connections. Further, check for a short circuit on the +5V line by testing for +5 V on the mother...
Why is my Jouan Laboratory Equipment vibrating?
If you're experiencing vibrations with your Jouan Laboratory Equipment, first check and adjust the sensitivity of the imbalance detector. If this doesn't resolve the issue, the imbalance board may need to be replaced. Next, inspect the rotor to ensure it is correctly fitted, paying close attention to the condition of the drive shaft collet and spring washers. Replace these parts if necessary and grease the washers, ensuring the shaft collet slides freely on the drive shaft. Also, check the motor's shock absorbers and replace them if they are defective. Inspect the motor 'nose' seal for defects or poor fitting, and replace or refit it, ensuring correct positioning and gluing. Finally, manually check the motor for bearing failure, ensuring it turns freely without noise or abnormal friction; ...
Details technical specifications including dimensions, electrical, and performance.
Provides instructions and warnings for properly installing the centrifuge.
Lists error codes, their reasons, and associated comments/exits.
Provides a chart linking problems, possible causes, and remedies.
Details the dismounting and refitting steps for the motor.
General| Brand | Jouan |
|---|---|
| Model | B4i |
| Category | Laboratory Equipment |
| Language | English |
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