SMPTE color bars, crosshatch patterns for geometry, and high-frequency luma bursts to check resolution limits.
| | Part Number(s) | Description & Typical Use | |-----------|--------------------|-------------------------------| | YEDS-18 | 3-702-101-01 | The most commonly referenced Sony test CD. Contains precise 1kHz test tones and specific tracking/focus patterns. Used to verify CD playback waveforms via oscilloscope. Appears in service manuals for hundreds of models, from portable stereos (CFD-EX35L) to home theatre systems (HCD-DX150). | | PATD-012 | 4-225-203-01 (also 3-702-101-01) | Specialized audio calibration disc designed for CD block verification. Sony manuals state: “CD Block is basically designed to operate without adjustment. Therefore, check each item in order given. Use PATD-012 disc unless otherwise indicated.” Frequently used with track 2 or track 5 for bias and level measurements. | | LUV-P01 | 4-999-032-01 | Another CD reference disc, often listed alongside YEDS-18. Used in DVD combination units for audio path verification during laser replacement procedures. | sony dvd test disc
Professional technicians use the test disc to output specific signals—like white noise or frequency sweeps—to measure the signal-to-noise ratio and frequency response. SMPTE color bars, crosshatch patterns for geometry, and
: These discs are designed for measuring and adjusting DVD players, with data recorded on the outer circumference of the disc. TDV-520CSO , with part number J-2501-236-A , appears to be a common single-layer test disc for DVD-SL (Single Layer) used in test modes. Used to verify CD playback waveforms via oscilloscope
These discs check the mechanical and electrical alignment of the optical pickup unit (OPU). They provide stable Radio Frequency (RF) signals, also known as the "eye pattern." Technicians hook an oscilloscope to the player's test points to look at this eye pattern. If the pattern is blurry or distorted, the laser lens is dirty, misaligned, or dying. 2. Defect and Error-Correction Discs (e.g., HLX-505)
What are you trying to fix?
Test discs help verify that the spindle motor, sled mechanism, and tray alignment operate within factory-specified parameters. Common Sony Test Disc Part Numbers