Technics RS-M10 Capacitor Replacement
I noticed that my Technics RS-M10 cassette deck from 1979 had that nasty green corrosion coming from a capacitor. Also inspecting the board underneath showed a trace that was damaged. Even though only one brand seemed to leak, I replaced all the electrolytic capacitors, since they are close to 50 years old now.
Here is a photo of the corrosion:
Another photo of the damaged trace:
I compiled a complete list of all the electrolytic capacitors using the service manual which can be found online and visual inspection:
|------|-------------|--------|------|--------|
| ID | Manual Ref. | Farad | Volt | Color |
|------|-------------|--------|------|--------|
| C1 | ECEA16Z10 | 10uF | 16V | Orange |
| C2 | ECEA16Z10 | 10uF | 16V | Orange |
| C7 | ECEA1HS100 | 10uF | 16V | Blue |
| C9 | ECEA1CS330 | 33uF | 16V | Blue |
| C10 | ECEA1CS330 | 33uF | 16V | Blue |
| C11 | ECEA1AS221 | 220uF | 6.3V | Blue |
| C12 | ECEA1AS221 | 220uF | 6.3V | Blue |
| C13 | ECEA1ES101 | 100uF | 16V | Blue |
| C19 | ECEA1HS100 | 10uF | 16V | Blue |
| C20 | ECEA1HS100 | 10uF | 16V | Blue |
| C25 | ECEA50MR33 | 0.33uF | 50V | Orange |
| C26 | ECEA50MR33 | 0.33uF | 50V | Orange |
| C27 | ECEA1AS221 | 220uF | 10V | Blue |
| C28 | ECEA1AS221 | 220uF | 10V | Blue |
| C29 | ECEA1CS331 | 330uF | 16V | Blue |
| C37 | ECEA1HS100 | 10uF | 16V | Blue |
| C38 | ECEA1HS100 | 10uF | 16V | Blue |
| C39 | ECEA50ZR33 | 0.33uF | 50V | Orange |
| C40 | ECEA50ZR33 | 0.33uF | 50V | Orange |
| C43 | ECEA1HS100 | 10uF | 16V | Blue |
| C44 | ECEA1HS100 | 10uF | 16V | Blue |
| C49 | ECEA1HS100 | 10uF | 16V | Blue |
| C50 | ECEA1HS100 | 10uF | 16V | Blue |
| C51 | ECEA25Z4R7 | 4.7uF | 25V | Blue |
| C52 | ECEA25Z4R7 | 4.7uF | 25V | Blue |
| C53 | ECEA50Z3R3 | 3.3uF | 50V | Purple |
| C54 | ECEA50Z3R3 | 3.3uF | 25V | Purple |
| C55 | ECEA50ZR1 | 0.1uF | 50V | Purple |
| C56 | ECEA50ZR1 | 0.1uF | 50V | Purple |
| C57 | ECEA1HS010 | 1uF | 50V | Blue |
| C58 | ECEA1HS010 | 1uF | 50V | Blue |
| C59 | ECEA1HS100 | 10uF | 16V | Blue |
| C60 | ECEA1HS100 | 10uF | 16V | Blue |
| C71 | ECEA50ZR22 | 0.22uF | 50V | Purple |
| C72 | ECEA50ZR22 | 0.22uF | 50V | Purple |
| C85 | ECEA1HS100 | 10uF | 16V | Blue |
| C86 | ECEA1HS100 | 10uF | 16V | Blue |
| C87 | ECEA1AS470 | 47uF | 10V | Blue |
| C88 | ECEA1AS470 | 47uF | 10V | Blue |
| C301 | ECEA1ES101 | 100uF | 16V | Blue |
| C401 | ECEA1ES102 | 1000uF | 25V | Blue |
| C402 | ECEA1ES471 | 470uF | 25V | Blue |
| C403 | ECEA1ES471 | 1000uF | 16V | Blue |
| C404 | ECEA1CS102 | 1000uF | 16V | Blue |
| C405 | ECEA1ES470 | 47uF | 25V | Blue |
| C406 | ECEA1ES470 | 47uF | 25V | Blue |
| C407 | ECEA1HS100 | 10uF | 16V | Blue |
| C408 | ECEA25Z4R7 | 4.7uF | 25V | Purple |
| C409 | ECEA1ES101 | 100uF | 25V | Blue |
|------|-------------|--------|------|--------|
All the old electrolytic capacitors removed:
I did not have all the correct values, so I ended up using 1uF instead of the very low value 0.1uF, 0.22uF and 0.33uF capacitors. I also did not have any 220uF available so I used 330uF for those instead. Everything worked fine afterwards and I recalibrated the speed and gain of the deck with a 3000 Hz test cassette tape.