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Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc.

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Old 21st May 2021, 2:15 pm   #1
Whaam68
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Join Date: Feb 2007
Location: Luton, Bedfordshire, UK.
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Default Teac A-450 unusual fault

Hi All
This deck has been slumbering away well wrapped in an insulated loft for several years. I had a day off work today and with the weather being what it is Decided to get it down and attempt a resurrection. Fitted new belts and gave the heads, capstan and pinch rollers a good clean. I noticed the insulation of the two core mains cable was damaged outside the unit and have also replaced this.

Now the wierd bitÖ. it was powering in intermittently before I took it apart and Inthought the power switch may have been at fault. When switched on the deck after cleaning it was completely dead, no lights or meter bulbs were lit. When play is pressed (piano key) however the deck springs to life everything comes on and sounds very good but there is some background noise. If I can figure out the fault I will re cap the power supply and see if this improves things. The power supply board is a bit of a pig to get at buried under a million bunched groups of cables.

Does anyone have any ideas on what might be the likely cause of the only powering on when play is selected? Any other key e.g Rewind leaves it dead.

Thanks
Mike
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Old 21st May 2021, 5:50 pm   #2
Whaam68
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Default Re: Teac A-450 unusual fault

Ok Iím going to admit my stupidity Ö..the ďfaultĒ it turns out was that in removing the front panel containing the switch legends I hadnít noticed In moving the deck Id errr inadvertently knocked the timer switch to onÖ.which is why pressing play overrode the timer and brought the deck to life. Cleaning the rec/play switch has also helped a lot. Some more work to do to get it to its best but itís getting there.
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Old 28th May 2021, 12:07 pm   #3
Welsh Anorak
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Default Re: Teac A-450 unusual fault

A Teac of this vintage will probably have good quality capacitors fitted, so I'd be reluctant to do a 'recap', especially as it's hard to access and you might accidentally introduce other faults - we've all done it.
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Old 28th May 2021, 10:21 pm   #4
Whaam68
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Default Re: Teac A-450 unusual fault

Hi Glyn
Now Iíve done the belts and cleaned and lubed it The audio sounds very good good but there is still a level of hum on the output and the volume on one channel occasionally fluctuates although the meters donít show anything amiss. The nippon chemicon caps are very good quality but now getting to near 50 years old. That said I will get around to removing a few and see how they test. From the state of it when I got it had been unused for a long time.
Mike
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