ATR-60.......advice........

  • Thread starter Thread starter ausrock
  • Start date Start date
ausrock said:
Motor checked out OK once I swapped it to the LH supply chain, it appears that both motors get their supply from the one source, this feed splits to supply each motors' "Joint PCB". One thing I can't figure at the moment is what the 2SD1047 transistor on the "TR PCB" does. Unfortunately, these things aren't the cheapest transistors I have found and sourcing them locally isn't over easy so we don't really have the option of buying a fistfull and swapping them over just to see what happens.......we have to attempt to eliminate and also understand components before we start surgery.

The pic shows the schematic for the "Joint and TR PCBs", if anyone can figure out what the TR transistor is there for please tell me.

Regards........... :cool:
Click to expand...

Just a quick look here:http://www.ampslab.com/PDF/2sd1047.pdf

That transistor is the one that controls the voltage to the motor (which is a DC motor). I can't tell from looking at the schematic exactly since the control signals coming to/from the TR PCB are not named in the pic, But, I can tell you that the transitor in the pic is a 140V/12A/60 Watt trans. That is a hefty transistor. The base of the trans is the control pin, and the collector is connected to the motor directly. You need to put a Oscope on the base and watch for the signal to go "High" (it is an NPN tranny) when you hit the proper button. If you get a changing signal on the base of the transistor, and +24V on the collector, then the trans is bad (The trans acts like a switch to ground, completing the circuit for the motor). If there is no changing voltage on the base, or no +24V on the collector, then you have to trace through the circuit to find where the missing signal(s) is.

Good Luck.
 
Train leaving to Transistorville, THIS WAY!!! ALL ABOARD!!!

................ :eek: :rolleyes: ;)
 
Any radio & TV repair technician should be able to repair that thing. Why should we teach you, farmer, orthopedic doctor or what the heck your buisness is, electronics? Division of labour has some sweet sides.

I can say: "A standard 3055 should do, preferably with a strong diode layed antiparallel to C and E and another diode antiparallel to B and E." But do you understand it?
 
Uli_the_Grasso said:
Any radio & TV repair technician should be able to repair that thing. Why should we teach you, farmer, orthopedic doctor or what the heck your buisness is, electronics? Division of labour has some sweet sides.

I can say: "A standard 3055 should do, preferably with a strong diode layed antiparallel to C and E and another diode antiparallel to B and E." But do you understand it?
Click to expand...

Uli,

We come here to help if we can and if we can't, or don't want to, we don't participate.

That's the way it works here.

If you don't like us, please leave and go where you will be appreciated.

But, don't ask questions like; "why should we teach you?"

If you have to ask that question, you don't understand the community nature of this place and you don't belong here.

Cheers! :)
 
Last edited:
Thank you Ghost, I wouldn't have been so gentle with the reply. ;)

I'm actually going to contact a tech friend about this as his years of experience will surely save me some hours of frustration.

In the last week I have learnt much about the basics of these machines and (possible unfortunately) it has wetted my appetite to get hold of some R2R gear..........I know of a local radio station that has apparently got a number of machines stuck in a store room doing nothing, so I will be contacting them shortly, if the dollars are reasonable things could get interesting.

:cool:
 
The radio station stash sounds tasty! :D

Let us know how it goes with that and your tech buddy.

Cheers! :)
 
Acorec,

I only just picked up on your post, that info is great!!! Thank You.

Following on from Ghost's earlier comments about transistor problems, I had been focusing on another hefty candidate (2SD716 0) that sits between the 24V (motor supply) secondary on the Pwr Supply PCB and the motors but have virtually ruled it out as it is common to both motors and the problems are only affecting one. The 2SD1047 seemed to be the next likely candidate but due to my obvious lack of technical diagnostic skills I figured I would throw that schematic in here for suggestions before proceeding. Considering each schematic is the equivalent to 3 A4 pages, I didn't think it was fair to dump them all in here.

I have recently been given an old TRIO 'scope so all I have to do is figure it out and I can then check that transistor.


Ghost,

Rumour has it that there are at least some 2 trks and an 8 trk in storage and definitely an Otari 16trk which has recently been de-commissioned, although they apparently cut the leads to the remote to remove it from service. The young tech I spoke to was going to check it all out with his boss and so long as they don't have unrealistic ideas about values and are willing to negotiate I may do business with them. Also, they do have calibration tapes which they are willing to lend me if I need them :) . An Otari MX-70 1" 16 trk just went through Ebay Aust., without getting a bid on the starting price of $1500 Aust. and there is an MX-5050 8 trk starting at $650 with no bids, so hopefully, if the station wants to dispose of the gear I can use these as examples to argue prices down.

OK guys, many thanks.

:cool:
 
Uli,

I registered here not long after the site's inception so I think I know quite well what kind of forum it is. It seems it is you that are having a problem with understanding that...........NOT me.

As was said in an earlier post, this site is now and always has been about helping people and if you have a problem with that, which from your ealier comment seems to be the case, then I suggest you find a different BBS to frequent as this one won't be for you.

:cool:
 
OK Guys,

We have a working ATR-60 :) .

Many thanks to all of you who posted positive comments and suggestions, particularly Ghost for giving me a direction and Acorec for the help with that schematic and confirming what that transistor was all about.

You were both "on the money".

Now to concentrate on these de-commissioned decks...........still trying to get someone to find out exactly what is there and what they want for them. I'll let you know how it goes, hopefully early this coming week.

:cool:
 
That's great news! :D

I'm really happy for you and glad to see another successful web guided repair! :)

Where was the bad transistor on your unit? Was it the one on the diagram you posted?

Cheers! :)
 
Sure was.

When you said about your machine and that trannie on a heat sink it set me on a course which led me to suspect a couple of possibilities but that one I highlighted on the scheme seemed the most likely suspect and Acorec's explanation made me more positive.

That trannie is one of four that are mounted to an 8" long sink so I tested that one and sure enough it was buggered. Sourcing a replacement locally was easier than I expected and we did the repair earlier today.

The friend that owns the deck is over the moon and I have learnt quite a lot so it's a win, win situation all around and it now appears that the de-comm'd 16 trk deck may be another ATR-60 so if anything positive comes of that I'll have a head start where maintenance is concerned. They guy at the radio station is still trying to get time to find out how many decks they have de-comm'd and have in a storage garage and what they are, plus there's apparently spares, tape and possibly alignment tapes as well.

I'm just keeping my fingers crossed that the "powers that be" have a realistic view of the decks values. In '96 the friend's ATR was $36,000 Aust., new...........he feels he would be lucky to get any more than $1500 for it these days and it is in good condition with remote, synchro unit and a heaps of tape.................the bright boys at the radio station cut the multicore cables from the remote, etc., so that they wouldn't have to disturb other cables as they removed the deck........go f**## figure.

Watch this space for further developments ;)

:cool:
 
Looks like we are doing a deal with the radio station, although at this stage they want to hang on to a number of the MX5050 1/4" decks for a bit longer.

Anyways, what they have offered is:

A Tascam ATR-60 16trk, any associated spare parts (not likely to be much), the calibration/test tapes, approx., 10 spools of tape (used).............there is some head wear but not enough to be an issue at this point in time and I will have to re-terminate the multi-cores into the remotes.

An Otari MX5050 1/4" 2trk, plus about 3 additional machines which are only good for parts..........there may be a few other bits and pieces but not much.

Total cost will be $1200 Aust., which is approx $850 US. Considering the test tapes cost close to $1000 Au., each and generally the decks are in good condition I don't think we can go far wrong.

:cool:
 
That sounds like a fantastic deal! :)

When do you take delivery?

Cheers! :)
 
Well since that earlier post I have confirmed the deal and at this stage we are going to try and arrange to get the gear on Thursday if I can coordinate the necessary people and vehicle.

A slighty funny side of this is that the young tech assistant at the station, was originally given the task of taking the ATR out of service and because of his inexperience and probably partly due to the "throw away" mentality he cut the remote multicores off 6" from the remotes.........apparently, the response he got from people was enough to tell him he had fucked up. Anyways, when I called the senior tech to confirm the deal he was cracking up..........he had earlier walked into their workroom to find the young guy stripping the multis back and reconnecting all the leads into the remotes.........guess his conscience got the better of him :D ...........so that saves me a few hours work so long as he didn't make any wrong connections.

I now have to re-organise (again) things here, buy another patch panel and the necessary multicores to get this into use. I will then have the option of recording to my Fostex D160 or the ATR-60, etc., depending on what is needed at the time.

Hopefully in the next couple of weeks I may have some pics of the new setup.

:cool:
 
Well, it all sounds great and especially with the Jr. technician putting the cable back together again! :cool:

Some picks of the set up would be cool too if you can arrange that, I'm sure we would all love to see your set up.

Cheers! :)
 
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