Not clear what you tried to do by shorting CT D to VSS. You're reffering to pin 7 (D CTL) ? As a general rule of thumb, you shouldn't short pins...
Indeed this fault may or may not be related to the capacitor replacement itself. However if these caps were leaky, it is possible that traces or...
There's no reason to have reservations about the chemical etching, in a worst case scenario it will simply do nothing. Outcome which I would say...
The transparent washer is what I've seen also, although haven't seen that many of them to say for sure that's the only washer that was used on...
Let us know how it goes. This clutch should have some resistance when rotated by hand, that should be the target. Like not hard to turn, but a...
The clue with the spring is important. I wouldn't focus on the felt pad or plastic disc surface, don't think the problem is there. The stiffness...
Looking in more detail at F707 seems very similar to R707. Thinking of it the 2 are likely identical, R707 just doesn't have the radio board in...
What's the symptom, very low takeup torque ? Note the reel gears are also failing in WM-150-type mechanisms and need to be glued or replaced. How...
Can't find a manual for R707, but depending on amplifier topology it's possible 2 of the big 220uF caps are coupling caps. However the location of...
Yes indeed the one in your link seems the same as the one on goofish. Wasn't aware it's available on Aliexpress also. And yes the one on goofish...
Tantalum capacitors don't contain fluid and are not a problem in general on cassette walkmans. IC damage I would put last, it's very unlikely...
For EX652/EX668 the mentioned W&F of 0.35% WRMS/0.25% WRMS isn't actually that bad. What you can do to make it lower is check if the clutch teeth...
From what I've seen online, the black seems to be the most common overall. Regarding why Chinese value black more than the silver could be some...
Indeed, although for a large collection it's unlikely all have been refurbished. That's one of the downsides of large collections: most will be...
Can be either the maximum rating of Vcc isn't that high (we don't know since we don't have a datasheet) or that the tolerance on the spec itself...
Grease I would only use for levers, everything else that's rotating on a shaft oil (even if it used grease from the factory). Oil is thinner and...
You can use the middle terminal, as that is only needed for the recharghable battery as you mentioned. Not sure what you mean by hot swapping...
Violet wires go to the FG points maked on the PCB silkscreen. Polarity doesn't matter. Unfortunately WM-5 has 2 versions and only one is depicted...
Fact wires are breaking where they're soldered shouldn't be a deal breaker given the effort you already put into this project. I would cut all...
The GX670 mechanism and variations of it that exist in the entire WM-EX/GX range can obtain low figures, however this is highly dependent on motor...
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