The Roland SDE‑3000 is a rack‑mounted digital delay unit that uses a proprietary 63H101 CMOS gate array and dual 12‑bit A/D converters to deliver up to 17 kHz delay bandwidth. Common failure points in this era of analog/digital hybrids include power supply rail degradation, CMOS IC burn‑in or latch‑up, and capacitor leakage on the ADC clocking circuitry; a shorted or failed 0.1 µF bypass cap can also cause erratic delay jumps. First‑check diagnostics: verify the unit’s input voltage (typically 12–15 VDC) with a multimeter, inspect for visible burn marks or bulging caps on the main board, and test the output level with an oscilloscope to confirm proper signal routing through the delay engine.[oss-gpt-20b]