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Teac cassette deck records at very low volume

I have a Teac V-350C cassette deck that records at a very low volume level. The volume level indicator shows a normal volume level during record, the sound level also seems to be normal when monitoring the sound through the deck's headphone jack. There is no distortion in the sound, it just records at a very low volume level. Cassettes recorded on other decks play at a good, normal level on the Teac. So, the problem seems to be record only, not playback.

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As I remember this deck is may not warrant the cost of a repair but in case you are attempting the repair yourself, the first thing to do is clean the heads real well. After that get a schematic off Hi Fi Engine if they have one and you will have to trace where the signal is missing. If both channel are the same it is possible a electrolytic capacitor has shorted in the Bias section of the record circuit. Levels do not shift downward all at once two channels at a time unless there is a common problem. I have know capacitors of the 10 V type to short and take the entire function of a deck out. Change that one 10 V cap and the deck works again. Of course this assumes you have the ability to change a electronic component. If not off to a technician it goes.

Posted on May 03, 2013

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Tape decks have a record amp, depending on the age of the machine it will probably be an IC. Yours might have failed. See if you can identify it or try and get a C diagram. To locate it follow the leads from the head. If your lucky it might have 'Rec Amp' on the board. Their maybe a preset marked 'rec level' for each channel. The (IC) box with legs - near them will most likely be it. Don't adjust the presets unless somebody has tampered with them before. (they will look to be sitting around the middle if they are OK).

Posted on Jan 25, 2009

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Posted on Jan 02, 2017

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Hello,
some weeks ago I got this really impressive deck (Teac Z 7000) from a colleague, and found the same problem. I fixed it, and the fix is not too complicated. It´s the potentiometers that do fail. All pots are from the same manufacturer (Alps) and construction. The problem is that the wisher is broken away from the holding plastic and will loose contact completely. You can check that with a normal ohmmeter: You´ll find the total resistance over the outer terminals but endless resistance from one of the outer terminals to the middle wisher contact. The values are: 100 kOhm linear for each of the upper left pots (fader,space), 2x22kOhm pos.log. for the lower left pot (phone volume). So, what does a broken wisher at the "fade in" pot do? The Recorder "thinks" that You selected an "endless" fade in time, and the result is : no record level. You can do an easy "quick and dirty" fix just to see if that´s the problem: Hold- or better solder- a say 47kOhm resistor in parallel to the conducted potentiometer terminals and try to record.
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This text was written by Boris Witke, Kelsterbach (near Frankfurt/Main), Germany. E-Mail:
witke1@web.de Please tell me if You were successful, possibly we get lucky users of these really fascinating machines.

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