The Futaba Corp. CJ2004 is a two‑axis Pulscale digital readout (DRO) featuring an 8‑digit vacuum fluorescent display and three‑wire control interface for motion controllers. Common issues reported on this model include incorrect resolution or accuracy settings, often caused by misconfigured calibration parameters or degraded signal integrity on the drive lines; intermittent display flicker can also stem from a failing VFD tube or loose connector. For first‑check diagnostics: verify that the DRO’s power supply voltage matches the spec (typically 12 V DC) and confirm all ground connections are secure; inspect the three control wires for continuity, proper polarity, and any visible damage; then review the controller’s resolution/accuracy register values against the intended mechanical units to ensure correct scaling.[oss-gpt-20b]