Good evening sir! Im currently trying to fix bad voltages on the main board of a royal de luxe, and your notes you've linked in description are QUITE useful! However I had a question: what do the blue arrows on the right side of it indicate? The board has problems in that exact area, so im just trying to wrap my head around it ahah. Cheers! And sorry ahah, this is my first time diving that deep into fixing old tech :)
I'm to embarrassed to admit that I don't remember exactly. Looking at it, I think they indicate signal tracing points on preamplifier stages. If you look the schematic I have the signal path with a green line from heads to line output (excluding bass, treble and route to power amplifier) starting from C7 up to C42.
@@dchatz Ah, I see, thanks! Yeah, this recorder is driving me insane ahah. Almost all the voltages are good, until I put it in stereo/recording mode (push recording button in + put it in "pause") as per manual. Then the only healthy ones are on the power supply board ("healthy" is a generous word tho, for example the 40v across the c17 cap are actually 43) 😭
@@dchatz Hello there sir, bit of a follow-up, had a quick question. So, I just remembered that the recorder arrived with the voltage selector set to 240 volts (from Germany). I'm in Italy, here it's 220, so I've set it to that. Now, most if not all voltages are off compared to the tech sheet, and are mostly higher. I've set the voltage selector to 240 and 250 just to test - at 250 most are pretty much exactly what the tech sheet says. I've excluded power supply board issues (first capacitor and two bridge rectifiers) and the transformer, they are all good. My question is, if you remember/can verify of course - what did you set the recorder to when measuring voltages? And also - is it normal for even the first components in the chain reading voltages that are slightly off, even after replacing them? This is my first time ever owning AND fixing a vintage device like this, so I apologize for a stupid question ahah. Thank you so much!
@@SkaR 220 or 240 setting should be fine. Here in Greece now the official mains voltage is 230v so many suggest to put it in 240v. Check if your mains voltage is actually above 220v since that looks like to be the case. I did not do any voltage checking on mine. I first checked if signal was out of the head preamplifier and found none. Then I checked if power was going to the head preamplifier and also found none (shorted cap). I then checked caps of the head preamplifier and found couple dead. After replacing all of them everything returned to normal and I did not check further. Please note that I'm not an electricial nor even a similar proffesion. Everything I know is out of years of self learning and I do it as a hobby for reel to reels. So I may not be able to give very detailed info.
