HELP! Problem with my new vintage tape deck! - diyAudio
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Old 19th November 2006, 12:29 AM   #1
Kuja is offline Kuja  Yugoslavia
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Join Date: Jun 2005
Location: Belgrade, Yugoslavia
Unhappy HELP! Problem with my new vintage tape deck!

Hello everybody,

I recently won on eBay this rare deck:

It arrived yesterday.

It is in perfect mechanical and optical condition.

Unfortunately I don't have any output from the left channel RCA jack.

The funny thing is that both channels work perfectly through the headphones!

So it must be something simple an stupid (hopefully).

On the PCB there is a combined line/headphone amp section.

There is a cable going to headphone jack from it and through PCB it is connected to output RCAs.

You can see everything on the pictures.

RCAs are fine - I also tried output from the 5-pole DIN connector with the same results.

What do you think is causing this problem?

Click the image to open in full size.
Click the image to open in full size.

What are those black rectangular C2021R G thingies near the output RCAs?

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Some more pics...

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Thanks in advance!

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Old 19th November 2006, 01:49 AM   #2
singa is offline singa  Singapore
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It could be a simple problem.

1. Look underneath the solder side at the rca if there are broken joints.The Q 17,18 of C2021 tells you they are transistors.
Actual= 2SC2021.They could be bad but I doubt it.Both of the coupling caps can't be bad either.

2. There may be a broken connection( metal spring/tip) in the headphone jack that shorts the signal to ground if not pluged in.So in effect the headphone is always "on".

Look for the obvious.Good luck.
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Old 19th November 2006, 07:49 AM   #3
Ghianni is offline Ghianni  Greece
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May be these are muting transistors. Check them.
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Old 19th November 2006, 08:17 AM   #4
Netlist is offline Netlist  Belgium
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Join Date: Jan 2003
If the deck has a mechanical REC/Play switch – could be the one with the blue strip – it might be the cause of the problem. A bit unlikely since the headphone plays but worth looking at nevertheless.
It could be a pot; don’t turn them. Very gently tap them with an small isolated screwdriver and listen if the sound returns.
Try to trace the signal back with a scope or a signal tracer or even a DMM in mVAC position.
Look for bad solder joints.

Oh..and make sure not to touch the Live mains board while poking around.

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