Tascam Porta 03

[The Dude]

Looking for a schematic or part number for the regulator that mounts to the tape counter assembly. You know,......the one with the big black hole where the part number is.

[Enzo]

My recall is dim, but isn't that a transistor, a TO126 maybe? 2SD613 sticks in my mind, but that could be wrong.


Is that the little wedge shaped cheap 4-channel? I believe I have a working one on my shelf. Is this repair yours? I'd expect just about any repair on it would exceed the value.

[The Dude]

The transistor is indeed a TO126 and the last and only digit I can see is a '1'. The digit before that is partially visible and is either a '0', '9', or '8'. Hard to tell for sure because of the hole blasted out of the middle of the transistor/regulator.

It is one of the cheaper little wedge shaped 4 track cassette recorders. It is a customer unit. I gave him an estimate fully expecting that it would not be repaired, but he said to go ahead with the work, so here I am.

Edit: I have contacted Tascam. Waiting to hear back from them.

[Enzo]

I am not near my files, or that unit I have. But do you have any other TASCAM Porta series schematics? I may be wrong, but seems to me several models use the same voltage regulator circuit. The part isn't critical, it is just a regulating transistor. I think it regulated 12-16v down to 9v... or something. So most any transistor will have voltage enough, and I don't think current will ever get up to a whole amp. Pretty sure it is NPN, but easy enough to determine from the circuit. I know there are a couple types they used, and I want to say they had related numbers, like 613 and 916 or something. I have a draw bin of them for just this repair. So look through your TO126 selection and see what you have.

Or 601 and 901, or...or...or...

[Enzo]

OK, I am at my shop, and I assume it is the transistor mounted to a bracket on the little board with the power jack.

That is a 2SB891R

[The Dude]

That's the one. Thank you SOOOOOOOOOO much Enzo! I appreciate it very much. I know you had to take the thing apart to find that. That's above and beyond. If I ever get to Lansing, drinks on me!

[Enzo]

No, I just got my TASCAM binder covering something like DA88 to Porta 5 off the shelf and unfolded the drawing from the Porta 3 manual. The deck was in fact still sitting on my desk from whenever I was looking at it. I think I was thinking of scrapping it.

For 40 some years I lived in an isolated rural farm house way out of town, but now I live in a senior apartment right downtown in Mason, MI, a Lansing suburb. It is still new to me, but I can walk out my front door, go two doors down and walk into a brew pub. You can still buy...

BAD Brewing Company I Mason Michigan I Microbrewery (517) 676-6774

[The Dude]

My band is playing in Brimley, MI in the fall. If we get through Lansing, I'll give you a head's up and THANKS AGAIN!

[Enzo]

Brimley? Where the hell...


Oh... The Bay Mills Casino?

Yeah, that is way upon the north side of the upper peninsula. ALmost 300 miles from me. That is in fact about 50 miles farther from me than Cleveland Ohio.

You coming across through Wisconsin and the upper peninsula? Or up through lower Michigan via Chicago?

[The Dude]

Yep, Bay Mills Casino. Our agency hasn't cemented route dates yet, so I'm not sure which way we'll come up. Last time we went via Minneapolis and Green Bay, but who knows. I do remember it being a beautiful drive and many friendly Canadians at the casino.

[Enzo]

All Canadians are friendly, eh? UP Michiganders (upper peninsula) are like Canadians-lite.

[g1]

mmmm that's pasty country up there!
I used to ride state-side from the Sault to Duluth, yes it's a very beautiful drive.

[Enzo]

And to everyone not from the region, that is pronounced PASS-tee. I do love the pastys. (Pasties?)

[SuperNerdyRedneck]

Sorry to bring up an ancient thread but its the only thing google brings up regarding this....

I am fixing a Porta 03 for a friend and it also has that regulator fried. I tried replacing it with a variety of PNP transistors and all that does it cause the resistor R250 to smoke. It seems like that part must be a voltage regulator because when 5v is applied to that part of the circuit everything (other than the transport, that requires 12v) works. I tried all the voltage regulators I have on hand but none seem to light this thing up. The original part ends in "91" Not sure what the first characters are as theres a big ol' scorch crater on them.

Any info anyone has would be much appreciated!

Thanks!

[g1]

see post #5 above.