Tascam 34 - meters doing strange things

  • Thread starter Thread starter rob aylestone
  • Start date Start date
Well, every time I try to upload a photo, it doesn't seem to work. But, if it did, this is the mess. I've got the card loose but I need to try and wiggle it around some wire bundles.
 

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Yeah, if I don't want to unwrap those bundles, I think the transformer, fuse holder and board will come out as a package. There are some wires soldered to the control board as well so it'll be a balancing act unless I want to start desoldering those, too. And I don't, really. Not for one transistor. So. That's a tomorrow project. I looked at Mouser and Digikey but neither of them cross-reference to 2CS1645B. NOS, yes, in the States (I'm in France), $17.95 a pop plus shipping, plus customs....for a transistor. $0.76 AliExpress but who knows what reference or what I'd actually receive. This whole project has waited 30 years (transferring tapes to computer) so tomorrow I'll just see if I can get THAT whole mess out of there and just stare at it until I can find a transistor. No big rush...keep calm and carry on, as the Brits say.
 
I wasn’t saying looking on the Mouser or Digikey website for cross-reference. Get old-school and call them…or open a live chat.

Generally it’s possible to navigate PCB assemblies out around hard soldered wires…it’s not uncommon for the power supply to have to dismount the main transformer, power switch, fuse PCB…

Not sure what the shipping would be, but, no, never spend money like $17.95 on a small current TO-92 transistor…that’s why I commented about shopping diligently…quick eBay search bring up these options:

https://ebay.us/m/egZpmU

https://ebay.us/m/BUTrU3

Yes, who knows what the shipping would be for the first one, and it is certainly a reasonable concern to question the authenticity of the component in the second one, but counterfeit parts are much more a concern or common with integrated circuits. I’d be comfortable purchasing either of the above.
 
And yeah okay I think if it was me I’d dismount the main power transformer, fuse PCB, and that sensor PCB mounted to the back of the takeup reel motor…take lots of pics, put hardware into different labeled baggies…those steps might help you make some gains with extracting the power supply PCB.
 
And the back board (control). It's on a bracket with just two screws so it'll come out with the rest. I ordered the transistor(s) from the first link. I bought 5 because, well, ya never know. Not too painful, shipping, etc.

One further question: should I be looking at D805, rectifier diode and D806, switching diode? D805 should be fine because I'm seeing 6Vdc at pin 1. I've got a 4006 around here somewhere which, I imagine would be overkill. D806, I'm not so confident because it is inline with the transistor and the bridge rectifier and something caused the transistor to fail and blow the fuse. Old age, maybe but while I'm there...I could probably do a complete recap, as well and I probably won't though the caps would be more easily sourced. Hmmm....it's just, how far down this rabbit-hole do I want to go?
 
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