Looking at the schematic, the battery and the DC in jack are in parallel so I have to assume the DC-DC converter (CP501) operates on a wide...
The MZ-1 is a pretty complex device and while I'm not familiar with it I want to share some thoughts regarding your issues: 1. The reading...
Those without the SONY branding are most likely genuine chips. Never seen a fake one myself without a SONY logo. The older ones (late 80s) are...
First of all, you will need to break the circuit in order to measure the current, so the current is deviated through the meter. It is very...
For measuring current, you need to connect the positive lead of the meter to the A/mA socket and connect the meter in series with the walkman....
Capacitors won't manifest this symptom, I would not consider them as a potential culprit. While caps are a common problem on these, it is Nichicon...
The issues with Dolby C are caused by incorrect Dolby levels as you guessed yourself. There will be issues with Dolby B as well, but less obvious...
It's hard to say without a recording if the hum is wihtin normal limits or not. There are a couple of things that must be taken into account: -...
I assume the low pitch noise you are talking about is motor hum, but I am not completely sure. Does this noise sound like a buzz ? And does it...
I do read quite a lot myself and have to say that I am surprised how many people are in the subjectivist camp when it comes to audio. I don't...
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