I have managed to find some Japanese Sony catalogue on Hi-Fi engine and they add some info and some misteries too. latest revision of family...
Well, Iron Maiden recordings from th 80's are not very high fidelity, I was just looking for a piece of music with strong cymbals to show how High...
The DD1/11/22 line is easy to spot as it has all round buttons with a different layout then the other DD's .. OT: very nice Discman collection !...
Here is the original clip https://www.sendspace.com/file/8co2n9 I have noticed too that even the tape deck loses a bit of high frequency, but...
It surely has been an excellent exercise in understanding the inner of a DD walkman, but maybe this DDIII is not worth the salvage. Rust is...
I would like to understand the time-line and the evolution if the DD series walkman's (playback only); cross referencing service manuals, Sony...
The pinch roller pressure specification calls for 170+/- 20 g; the spring on the left of the pinch-roller is responsible for pushing it against...
Here are some samples for quick comparison: https://www.sendspace.com/file/r4ugpp It is a 1 minute sample played back through my tapedeck...
Quartz frequency is 27.7 kHz. The frequency used by IC601 is 27.7/32 = 866 Hz. The numbers look good to me so actually you were right about IC601...
1.45V is correct according to service manual... have you checked the reference signal from IC602 ? You previously said that if you disconnect the...
service manual indicates between 65 and 80 mA for play, FFW and REW. There is no indication if it is measured with a cassette, but it would be...
My DDIII, which is being serviced (by Marian), has indeed a worn head with a damaged gap and that explains its weak treble. I am always afraid of...
According to the service manual, the input voltage to the motor is expected at ~1.45 V (output of Q601), but I have no idea if ~2 V is still...
The DD3 has an external quartzed oscillator to drive the PLL that locks the capstan rotation. The quarts X601 generates a frequency of ~27 kHz...
Marian has looked into the WM-3 and fixed it. Luckily it is a capacitors problem, not a faulty IC. [ATTACH] With reference to the above...
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