The manual provides:
Without a test tape, use a factory-recorded music tape – but manual’s method is superior. Philips D6920 Mk2 Service Manual
| Symptom | Manual Section to Consult | |--------|---------------------------| | Deck won’t play / sluggish | Mechanical diagram – belt replacement | | Motor runs but reels don’t turn | Idler tire replacement (parts list) | | Sound muffled / no highs | Head azimuth adjustment (alignment) | | One channel dead | Audio amp schematic + PCB layout | | Hum / motor noise | Grounding & shielding diagrams | | Auto-reverse fails | Logic control circuit diagram | | Record function not working | Bias oscillator & record amp schematics | The manual provides:
The D6920 Mk1 is electrically very similar but may have different PCB layout or logic ICs. Without a test tape, use a factory-recorded music
If absolutely no manual exists:
The manual lists:
Belt sizes (if not in manual – measure old belt or use a kit for Philips D6900/D6920 series).