Just thought I’d share some pictures of the promotional / odd-bod bits and pieces collected over the years working for Sony/Panasonic/Technics etc. The Sony Discman thermometer is particularly rare, I’ve never seen another online, it was given to me by the tech team at Sony around 1988.
Lots of pens 🙂
One of the Panasonic mugs is one of those thermal jobbies, which reveals the branding when hot.
And a few umbrella’s too.
I just don’t think companies out there are interested in promotional items as much as they used to be. Sad really, as these are really nice things to show off your brand.
Here’s part two of the ultrasonic repair. Replacement ultrasonic resonator fitted.
Still didn’t work, strange, measured the new unit, and it’s 3.8nF, measured the old unit and its 5.2nF even though it’s marked 3.7nF.
The circuit is looking for approximately 3.7nF, so the new unit is correct. Then I noticed there’s an extra capacitor fitted to the circuit that the larger ultrasonic cleaner doesn’t have.
I’m guessing this is because there are two ultrasonic resonators in parallel, so the capacitance would have to be doubled, so I thought what the hell let’s match the other cleaner and see what happens, took the capacitor out and the thing works fine.
I guess I’ll have to experiment to find the perfect resonant circuit, but for the meantime things are okay. I’m assuming the wound coil is not the correct mH to make the circuit run properly.
Just a side note, if you want to test an ultrasonic cleaner, the best way to visually see how it’s performing is to place a piece of aluminium foil in it, and switch it on, if all is working well, the aluminium foil will be dissolved in the places where the ultrasonic cavitations are the strongest.
Okey, a bit special this one, it’s just over fifty years old, so needs a little love and no new components if at all possible. The idea is to preserve this radio as it has it’s box and instructions in mint condition.
Got the manual ready for the setup.
Careful strip down and hooked up to the test equipment.
Well, the ‘Franken-Roberts’ lives, found some NOS displays that I bought years ago, because they were cheap 😀 Anyway, fitted one (after finally finding a manufacturers pdf of both displays) and bingo, it’s alive.
Repaired the psu and I think I’ll relegate it to the workshop as a background noise machine. Another job, jobbed.
This one’s a bit poorly, and is suffering from the usual dodgy capacitor problem. However, it’s in a lovely condition so be ashamed to let it die.
The little round silver things are the capacitors, and are directly soldered onto the circuit board, they are filled with fish oil, yes you heard it right, fish oil, and unfortunately this leaks all over the board when these go faulty.
So, its a case of removing each one individually with two soldering irons, and then replacing them with quality replacements. This is not a job for the fainthearted, as if you try to twist these capacitors off on this type of board, you’ll damage it because the traces just lift off straightaway. Be warned, these circuit boards are very delicate.