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| Sony WM-F2078 Screeching noise, tinny out of phase audio | |
|---|---|
| Device | Walkman Sports WM-F2078 |
| Affects part(s) | Circuit Boards |
| Needs equipment | Hot Air Rework Station / Hot Tweezers, Soldering Iron, Solder Wick, Solder Flux, Tweezers, Screwdrivers, basic tools |
| Difficulty | ◉◉◉◌ Hard |
| Type | Part replacement |
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Problem description
Audio quality is bad, and there is a screeching sound coming from the speakers / headphones. Solved with a Re Cap.
Symptoms
Detail all measurable or observable symptoms in this section.
- When playing a cassette with Dolby noise reduction turned on: at lower volumes there is a screeching noise coming from the audio output.
- The audio is tinny, and it sounds as if 1 of the speakers has the wrong polarity.
Solution
Replace the electrolytic capacitors.
Capacitors:
- 1 - 100 uF 4V (I used EMVA6R3ADA101ME55G)
- 6 - 220 uF 4V (I used EEE-HA0J221WP)
- 1 - 330 uF 2V (I used UUR0G331MCL1GS)
Hopefully the part numbers will help you find capacitors that will fit.
Diagnostic Steps
Repair Steps
- Take Apart Walkman, it's pretty straightforward if you've worked on electronics before. There's a little plastic snap ring like thing that goes on the door prop hinge and is easy to lose. There's also a spring that opens the battery door that's also easy to lose. (Don't ask me how I know...)
- Make sure you have adequate ventilation. The capacitors in my Walkman reeked of fish when I heated them up with hot air, and stunk up my place.
- Replace caps on the sub board. (The smaller board on the cassette mechanism part.) Be careful not to melt the switch that switches between Ferric and Chrome / Metal tape. Reassemble and test. At this point, the screeching noise issue should be resolved.
- Replace caps on the main board. Be careful not to melt the ribbon connector. When the 330uF capacitor has been replaced, the Tinny out of phase audio issue should be resolved.
- Reassemble and test.