Shimadzu Spd20a User Manual Better |verified|

| 💻 Message / Symptom | 🧐 Check & Diagnose | 🛠️ Likely Fix | | :--- | :--- | :--- | | | Lamp may have failed, or the circuit board is at fault. | First, replace the D2 lamp. If error persists, contact support. | | Leak Alarm | System may have an actual liquid leak, or sensor is too sensitive. | Check all fittings; if dry, recalibrate the leak sensor threshold via the CALIBRATION menu. | | CHECK NO GOOD | Wavelength calibration has failed. | Clean the flow cell. Check the D2 lamp is bright and stable. If issue remains, a service engineer may need to adjust the grating. | | Baseline Noise / Drift | Most common issue, rarely a true detector fault. | 1. Flush the flow cell. 2. Check for bubbles in the cell. 3. Check pump stability. | | Slow ZERO Function | Detector is slow to return to baseline. | The flow cell or optical window is likely contaminated. Clean as per the manual. |

Access the lamp compartment without disturbing the adjacent optical mirrors. shimadzu spd20a user manual better