Hello, Recently I've had enough time to solve the speed irregularity issue in my M-1PD that I had posted about here before. The speed is now fine, but it has issues with recording. It heavily drops out or cuts off music on the more intense segments, with a lot going on. It's most common and pronounced when recording on metal microcassettes. However, it sometimes also happens when recording on ferric microcassettes. I've been able to compensate for this issue, at least when using ferric microcassettes, by switching the tape type selector to the metal position. Additionally, the battery/rec LED dims down when recording, and I don't think it should do that. It looks as if the device lacks enough power, but I tried it on fresh batteries and it didn't change anything. What might be causing this? Thank you in advance for any help.
Hi, thank you, that is what I've been suspecting as well. Do you know which board is the power board though? I'm just a beginner and there aren't any schematics of this model available online.
I would imagine there is only one board, I think there would also be not too many caps to change, however you would need some soldering skills to change them.
I've been practicing soldering on devices of similar size, changing electrolytic capacitors shouldn't be problematic, I think. There are two boards, one has components like the volume pot, tape type switch and the jacks on it, so is it safe to assume it's the amplifier/sound board? The 2nd board is smaller and is directly under the battery compartment. I'm sorry if I'm asking obvious questions but this device is very valuable to me and I don't want to ruin it by a hasty repair.
Yeah i would assume the board underneath sounds like the main board and would house power. I have one here, i will crack it open and have a look tomorrow if i get time
Hey, I opened mine and wrote down the values of electrolytic capacitors on that board. Should the tantalum capacitors be replaced too? Do they last longer than regular electrolytics?
I've replaced all electrolytic caps on that board, but to no avail. The only thing that changed is the amount of background hum and hiss - there's definitely much less of it now.
