Digest for sci.electronics.repair@googlegroups.com - 15 updates in 5 topics

Rev. 11D Meow! <rev.11d.meow@gmail.com>: Jun 11 06:46PM -0700

I've hunted all over and find decades old information on this being a
typical problem for this unit, but cannot find the parts &
instructions on how to fix it.
 
I Have The Tools
 
Anyone familiar with this situation on these units, so I can get mine
working again, please?
 
In the interim I bought their PCM-M1 in mint condition to get going
again, but it'd be really nice to get my old tried & true TCD-D8
running again as it's in pristine condition other than this failure to
load.
 
Thanks
N_Cook <diverse@tcp.co.uk>: Jun 12 11:52AM +0100

On 12/06/2015 02:46, Rev. 11D Meow! wrote:
> running again as it's in pristine condition other than this failure to
> load.
 
> Thanks
 
If its like the D3 or D10 then no rubber bands to perish, direct motor
drives. First suspect would be the cassette detect switch bent or
corroded. If motor tries to work then perhaps its failure of the
multi-poles of the motor, they are so close together they jump and
"fuse" , whatever the terminology is. End result is loss of poles and
loss of torque or failure to turn more than part of a turn
Rev. 11D Meow! <rev.11d.meow@gmail.com>: Jun 12 05:00AM -0700

>multi-poles of the motor, they are so close together they jump and
>"fuse" , whatever the terminology is. End result is loss of poles and
>loss of torque or failure to turn more than part of a turn
 
From what I've read it's something to do with the need for a slightly
reshaped cam of som e sort.
 
This is all I find on the problem'.
Actually this place Has Everything to do with these Sony DATs in one
place, pretty much.
http://www.rockpark.com/d7
 
BTW this http://www.rockpark.com/d7/8_build.txt can be found REALLY
PROFESSIONALLY MADE for $45 at Core. I'd be stuck at the finding the
7-pin plug part.
 
For some reason the article about the D8 having DAT cartridge load
problems is not on this page as I thought it is. argh & drat
 
whoop, found it again, but it's like way gone by now...
http://www.libermansound.com/repair/dat.php
 
argh
Rev. 11D Meow! <rev.11d.meow@gmail.com>: Jun 12 05:16AM -0700

On Fri, 12 Jun 2015 05:00:20 -0700, Rev. 11D Meow!
 
>whoop, found it again, but it's like way gone by now...
>http://www.libermansound.com/repair/dat.php
 
>argh
 
ok, this is way fun, actually, for old-times "WHAM THE TV AND IT'LL
WORK" days refreshment.
 
IT WORKED!
 
The unit successfully loads the DAT cartridge afte 5 "Distinct Opening
& Closing of the Loader Door. Then WHAMMING IT PERFECTLY PARALLEL with
the desktop three times...
et VIOLA!
 
SHE WORKS!
 
Oh No
 
That isn't the problem after all.
 
The cartridges now load okay, but Play does not do anything but...
LOAD {flashing}
0H00M00S shows and the LOAD process is over.
 
The one person suggested pressing Record Then Pause to do something or
other, so let's try that, eh.
 
UnLoad Tape
slam the gizmo one more time for effect
Load Tape
Hit Rewind LOAD flashes then the unit stops as it is at the beginning
of the tape.
Press FF and it tries for a few seconds then stops at the same set of
zeros.
Press & Hold FF and it does the same thing.
Press Record and it says TAPE PROTECT, oopsy
UnLoad Tape
{there's no label on this tape so it is probably FRANK ZAPPA LIVE AT
THE KINGDOME OR SOMETHING REALLY IMPORTANT TODAY!}
un-latch write-protect on DAT tape thingy
put it back in and it says LOAD for a second then all zeros as that's
where it was last time or something
Press Record
nothing happens
Oh, Wait, Press Play to begin THE ARMED RECORDING thingy
er, uh, no it's press Record & Play at The Same Time, oopsy
AH HA moment WRITE shows up for a second or two then the tape
transport STOPS and we are still at all zeros tape time.
 
hmmmmmmmmmm
 
what now, bloss?
"Gareth Magennis" <sound.service@btconnect.com>: Jun 12 04:56PM +0100

"Rev. 11D Meow!" wrote in message
news:77ekna5llo2mbprqbc9m0a3g745bdfbr5k@4ax.com...
 
I've hunted all over and find decades old information on this being a
typical problem for this unit, but cannot find the parts &
instructions on how to fix it.
 
I Have The Tools
 
Anyone familiar with this situation on these units, so I can get mine
working again, please?
 
In the interim I bought their PCM-M1 in mint condition to get going
again, but it'd be really nice to get my old tried & true TCD-D8
running again as it's in pristine condition other than this failure to
load.
 
Thanks
 
 
 
 
I used to repair DAT's years ago. Even then I wouldn't fix one of these
unless I had to, they were and are a nightmare.
 
Partly due to the fact that they have a miniature head, meaning you have to
wrap the tape around a load more of it than the 90 degrees a normal head
requires.
And being kind of small, they were kind of a bastard to work on anyway.
 
Typical DAT problems are dirty or broken Mode Switches. These tell the
machine what position the transport and loading mechanism are in. Or won't
if they don't work properly.
You can sometimes clean these with switch cleaner.
 
Other common loading problems is the loading mech not getting the tape quite
far enough when trying to wrap it round the head. This can be due to worn
or dry sleds and runners. Careful lubrication might help.
You can sometimes clarify whether this is the problem by trying to give them
a helping hand whilst loading - sometimes you will be able to push them
fully home.
 
But there are all sorts of other mechanical things that wear, lose their
lubricants, and were just not designed well in the first place.
It's usually a combination of many many different things being not quite
right any more.
 
 
If you want a DAT that is very easy to work on, get a Panasonic SV3700 or
3800.
 
 
Good luck.
 
 
 
Gareth.
jurb6006@gmail.com: Jun 11 09:33AM -0700

I really didn't want to sound like a whiner, but it comes out how it comes out. Not all that easy finding ones self obsolete. Like that episode of Twilight Zone where the Nazi type guy is up at a desk and they get this librarian before him claiming he is obsolete. They never did go into what was to become of him but I think the Naziist unifom alluded to the fact that it was not going to be pleasant. Of course later that guy is dowwn there ansd they are calling him obsolete. Name was Wordsworrth in the story and played by someone famous, Swiazey ? Short guy and I seem to remember hi saying lke "Tkaes a licking ad keeps on ticking".
 
At any rate, it is bad enough that we don't build anything here anymore, and now it is getting to the point where we can't fix anything either. Another reference to scifi - those old races who needed to kidnap humans because they could no longer repair the machines left by their ancestors. Maybe the neveer could be repaired in the first place. Seems like Earth wil be that way someday.
 
Bottom line isd we are not coming back. There is no turning back the hands of time, and this was a one way street. They are not going to eliminate the advances in technology that allows one person to do the work of ten, that would be stupid. And they are not going to pay peolle $35 an hours to sweep floors and flip burgers. Machines will do the rest, for noting an hour. Just pour in the raw amterials ad make sure it doesn't make any funny noises. When one of your seven machines makes noise or a light goes on, you cann one of the three people in the whole company who know what they're doing.
 
Going the Luddite way is not really right either, things are more efficient. It is not a time to go back to wasting energy. so we are stuck wit it.
 
I am not 69. You might get SS now which should help a bit but it is not easy to go from making $50,000 a yeear to $1,500 a month. At least medical is taken care of, because they made a REAL ness out f that. the ACA is going to see medicsal rates go through the roof because now there are more pockets to pick. I am 54 and ir is just a little too far off for me to get my check but truthfully I won't get that much because I have been a non-taxpayer for a long time. that is a long story how to do that and actually for themoney I made it wasn't worth it. For my buddy it was worth it but he made like five times what I made. Of course, there is a chance I won't live to get it. And my eyesight is so bad I don't even want to ride a bicycle now, but they still are not going to give me disability. Maybe if I get some shoe polish and gian a drug addiction, but dammit, I don't even tsake aspirin. If beer and toking don't make me fell better then I don't feel better. All natural y'see.
 
But back to the topic. I now have a little job at a music srtore fixing amps and effects, mixing boards and all that. The occasional keyboard as well. I am making about half of whart I made per hour ten years ago. What's mote they are clueless about the service industry. they do not charge a checkout fee which is a nono in my book, and I see ion some tickets "call if over $20". WTF dothey think ?i make, $2 an hour ? Or that I am independently wealthy and do this for fun ? I had to move back in with family just to make it. The only nice thing I can say about it is that atleast I don't have to bust ass to justify my pay. And from what I heard, even though I came in pretty much green to the field I have much surpassed my predecessor. They still don't know. I have one amp in there that need an Icepower module which costs almost what they charged for it when they sold it, and it did not go bad by itself. the customer should be paying for the pat at the very least. And if they don't charge him and he does it again, what then ? I say reach into the guy's pocket and teach him not to do whatevr it was. Phil Allison thinks maybe the idiot plugged a speaker out into the input judgeing by where the burn marks were near the inpur side of the board. Either that or a lighrtning strike induced something trhough ground.
 
And then we have on we sold and the guy thought maybbe warranty because I gues, it is pretty new. Tube hybrid. Sent it to the ASC call Empirical sound ho charges a $20 fee. for that they said manufacturer will not help, bulging caps.
 
Bullshit, it had ONE bulging cap on the negative sie of a split supply and blown fuses to the rects on that source. Junped it out and the bulging cap is getting hot. changed it and it orks fine. The negative source almost assudredly has less load on it so the voltage climbed more on that source DURING THE POWER SURGE. these people do not understand when I say the thing did not blow on its own, I know WTF I am talking about. I can prove it to insurance companies, though I? have no paper credentials. I'll walk them though it on the stand if necessary. But what are they going to do ? I bet they don't even charge the guy twenty bucks like the other place did to NOT fix it.
 
Andf agian I have been offered autonmy. Run the service but you have to fix X amount of their shit to pay rent. No way Jose'. First of all they would ever pay my rates or get pissed off and say the renyt is ten fgrand a month. If I am responsible for profit and loss I would just as son have my own place. Period.
 
Andnow ther eis the internet. I just got done doing a Mitsubishi Interplay system. you can't get the output IC so I retrofitted newer ICs in it. However I had to fix the cassette which was no fun, and I thre a set of blts in the turtable. And then UPS fucked it up on the way back. And it was $300 for the round trip ! I fixed it, but thios time we went and drove and met the guy halfway. Fuck all that.
 
Now I might have a Sony receiver coming wiht a bad OP AMP in the tone circuit. Hopefull this goes better. It is smaller, it is not as fragile, AND these components are not power, they do not need to be on the heat sink or anything. we'll see how that goes.
 
But really, TVs are a thing of the past. At one time it wwas fun with Grampa. Old Geezer used to go scrapping. He did not need the money at all but kept busy. got those aluinum lawn chairs out the garbage, stripped them and took in the aluminum. He started getting TVs as well. We played in the baement until one day he hands me some money. "What is this ?". "That TV we fixed, I sold it, here's your cut". Working but didn't even know it ! used to go over there on Saturdays and just hang around. they all doted over my sdister because she was the first girl born in the family for deades. All of our cousins are male except one, who is younger than my sister. Hey, too late. (by about two years for all that attention)
 
So I have no idea what to do. At least my overhead is now nil. I still have a shitload of tools, including the olman's machines. the lathe is crappy butit works, and a little Chinese mini milling machine. Friend of mine is talking going into some business involving a 3D printer so that might fit in nicely for making mechanical parts.
 
All I know is the money is in what most people can do. the fewer who can do it the better. the only thing that made me in the TV business is that I could do what the other techs could not.
 
Though I didn't get all that money, the guy woith the Mits literally has $600 into it. Nobody else would touch it. So many are stuck in that geting the right part. When I was at ELectrasound I said somethignlike "All you gotta do is... ..." and their response was "See the name on the TV ? You want to take that name off and put yours on it ?".
 
Well to that I say when they won't sell you the parts or make them too expensive, they already took their name off of it. And they know, peole, at least soem people, are getting ore resourceful. It is really like that in other countries from what I hear. So mnow it is software. they are gong to get you in software. And I found evidence of a self destuct mechanism in a Mits DLP. Most people do not think about the engineering and why they do this and that, but I DO. Witness :
 
https://dl.dropboxusercontent.com/u/29948706/mitsdpps.jpg
 
What is the purpose of R9088 and C9087 ? It is totaly unnecessary for regulation, it passes no DC. there should be very little ripple there, but when C9015 develps a little ESR it is gong to affect regulation and make the voltage, most likely drop a bit under certain conditions, like when cold.
 
Then the effect on the firmware is goiung to be like an older PC when the CMOS battery starts to get low. Sure it might stop boting, but another high possiblity is the dat will be corrupted. And data corruption was a cnnom failure in that model.
 
Some wuill say that network stabilises the power supply. While that may be true though totaly unnecessary it has a quite useful function as far as the manufacturer is concerned, it causes a failure, and that will likely be out of warranty.
 
This is how they can do things insidiously. For decades I have been saying it is a war between servicers and manufacturers. Like when they put electrolytics right near a heatsink. What did they think waas gong to happen ? EXACTLY WHAT DID HAPPEN.
 
I for one, am sick of it. And people buy this shit. and they whine about no jobs. Well they got it coming. Back 35 yeears ago when they looked at TVs in the store and saw a Zenith for $279 and a Sanyo for $249, they pocketed that $30 and had a good time with it. How's that working out for your kids skinflint ? Now we got nothing.
 
And they are talking about gong to war ? Iran ? Iraq broke our back. And Iran would never shoot off a nuke because they know what would happen next, but the warmongers don't want to try to pump oil out of a glass parking lot. that is what is REALLY going on. Iran is no threat at all, even ex Mossad people are saying that.
 
And now, in a way I give up. I bitch about Israel so much people think I am anti-Semite. I am not and actualy am considering voting for Bernie Sanders. Seriously, he is quite socialistic but it seem the only way now after what's been done has been done. there is no turning back. We do not have the industry. And it is not coming back.
 
there are so many reasons. First of all we do not have the infrastructure and by that I mean more than roads and electricity n shit. I mean a competent and willing workforce. Employees you don't have to watch every mibnute or they'll steal your tyools. Punch in and out each other's time cards. Sue over a snide remark. TRY to get hurt on the job to get comp. See this is what we have today.
 
so moving overseas where people are hungry is a good ove, and ever since the Doidge brothers sued Ford and won, if they can make more mony doing it they must or they will be ousted in the next vote. The CEOs simply cannot operate in the best interest of the country, they must maximize profits art all costs.
 
And they are lilling the goose that laid the golden eggs. The MOST lucrative market on the planet is almost dead. Peole used to pay cash for new cars, even houses ! Nopw they have to put gasoline for the cars on credit.
 
I have seen alot of change in my day, notably shorter of course, but I don't like it anyway. Really, even though Bermie Sanders is a socialist, he cannot turn this cuntry into a socialist country any more than Obama could take away the gunbs or Bush could make abortion illegal. the President sinmply does not have that much power. and that's a good thig. I think Sanders is at least loyal to the US. More loyal than Romnaey, more loyal than Hillary. Either of those two would start WW3. I think Bernie knows how to count. The state of california has more debt than Russia, and Russia is already preparing for war after the US' antics in Ukraine. Theyare abotu to break out the sub killing helicopters they mothboaled due to traty many years ago. thik of all the cool modofocations they can make to them now. Don't anyone kid yourself, Russia is no slouch ehne it comes to technology. And you can cite all the half trillion dollar offense budget of the US, but they pay $600 for a tilet seat. you think Putin would put up with thet ? And Putin is one of the few very competent world leaders now. HE is a real SOB but I really think that now he got his, he wants to do what is right for Russia. After all he was born there. The only recent President we've had that is anywhere in the league with Purtin was George H W Bush and his loyalty was NOT to the US, it was to big oil.
 
This next war is gong to be a big one, but there will be one nice thing about it. The world won't be overpopulated so. But it doens't look good. the other side will have Russia, China, India and Pakistan at the very least.
 
These days, I think the older you are the better. And I have no kids. I can just make some popcorn and sit back. Almost ANY next President will start WW3. Bernie Sanders ? Well let's see if he has any chance. I suspect they are going to treat him like Ron Paul in the debates and that will take care of that.
 
Enough.
Chuck <chuck@mydeja.net>: Jun 11 06:18PM -0500

On Thu, 11 Jun 2015 06:30:06 -0700 (PDT), captainvideo462009@gmail.com
wrote:
 
 
>These days, engineering is shit, parts are NLA after three years, there is no longer much if any manufacturer support, and customers have dumped their old reliable tube sets by the truckload and succumbed to this wave of imported "uneconomical to repair" shit. Actually that's not completely true. Some parts are available. However, they're so fucking expensive as to make many repairs uneconomical. So I might get a 50.00 diagnosis fee and then they come and pick up the set. Or they try to stick me with it saying "you can have it for parts". Like I need another boat anchor in my basement. And this might happen twice a month.
 
>So here I am on a Thursday morning. Instead of working down in the shop I'm sitting here on the couch in my underwear writing this. At 69 I'm not about to reinvent myself, so for what it's worth I'm hanging in there.
 
>Hey now's the time to resurrect those old HO trains for my grandson, fix those old RCA 630 chassis I've had in the basement from day 1, repair my RC plane and fly it again, etc, etc. I've got plenty to do, and although sure, I'm bitter too, what the fuck, life goes on, doesn't it? Lenny
 
 
Wasn't it great back in the 80s? The company I worked for did over
95% warranty work on televisions. Hitachi paid $50.00 dollars per set
for labor and were the quickest to fix, AOC paid $35.00, Phillips paid
40.00 major, $20.00 minor. The tech got 42% of the labor and I
completed between 8 and 9 sets a day on average. The company paid
completely for health insurance. A friend of mine got testicular
cancer from the cleaning chemicals we used on car stereos. Our
insurance company paid hundreds of thousands of dollars to save his
life including months at a treatment center in Houston. He didn't pay
a cent. I make less now than I did then, not counting inflation, and
I don't enjoy the work I am doing as a server administrator. The
insurance I have now kept my wife from having a vital treatment for
months when she had cancer. I guess they were hoping she would die. I
really miss scrupulous companies, repairable products and being a
tech.
 
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"Mark Zacharias" <mark_zacharias@labolgcbs.net>: Jun 12 06:36AM -0500

"Chuck" <chuck@mydeja.net> wrote in message
news:h94knadvke49j1c1gnkuqjmbnle5mu68i5@4ax.com...
 
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
 
We had a few very good years between about 2005 and 2009. Extended and
regular warranties, lots of sets worth fixing.
 
Health insurance plus bonuses.
 
When the economy tanked it all went away. Never came back.
 
The extended warranty companies found cheaper ways of doing things, sets got
even cheaper, manufacturers quit field service in favor of depot service or
just replacement.
 
We're down to about three companies for which we do warranty service, and
they don't pay shit for the most part.
 
We're down from five technicians to two, my partner / co-owner and myself.
We work longer, make much less, and have to put up with the constant stream
of shitheads who've been on Youtube and think they can fix it themselves,
and the rest who are simply cheapskates.
 
Just trying to hang on til retirement.
 
Mark Z.
"hrhofmann@sbcglobal.net" <hrhofmann@sbcglobal.net>: Jun 11 08:31PM -0700

I have four 20 year old "POLAROID POLARPULSE" batteries that still read 5.86V when I measure them. They are about 2" x 3" mounted on a heavyweight piece of paper that is 3" x 4". They have been kept at room temperature all the 20 years. It is amazing that after 20 years there is any charge left. I am wondering what chemistry Polaroid used in these batteries?
Rev. 11D Meow! <rev.11d.meow@gmail.com>: Jun 11 09:16PM -0700

On Thu, 11 Jun 2015 20:31:53 -0700 (PDT), "hrhofmann@sbcglobal.net"
 
>I have four 20 year old "POLAROID POLARPULSE" batteries that still read 5.86V when I measure them. They are about 2" x 3" mounted on a heavyweight piece of paper that is 3" x 4". They have been kept at room temperature all the 20 years. It is amazing that after 20 years there is any charge left. I am wondering what chemistry Polaroid used in these batteries?
 
You might find some useful info on these guys here:
http://users.rcn.com/fcohen/typical.htm
Phil Allison <pallison49@gmail.com>: Jun 11 09:51PM -0700


> I have four 20 year old "POLAROID POLARPULSE" batteries that still read 5.86V when I measure them. They are about 2" x 3" mounted on a heavyweight piece of paper that is 3" x 4". They have been kept at room temperature all the 20 years. It is amazing that after 20 years there is any charge left. I am wondering what chemistry Polaroid used in these batteries?
 
 
** The Wiki on the Polaroid SX-70 tell me the battery used was "Zinc Chloride".
 
Another Wiki informs these are the familiar "Heavy Duty" carbon zinc cells.
 
 
 
 
... Phil
Jeff Liebermann <jeffl@cruzio.com>: Jun 11 10:14PM -0700

On Thu, 11 Jun 2015 20:31:53 -0700 (PDT), "hrhofmann@sbcglobal.net"
 
>I have four 20 year old "POLAROID POLARPULSE" batteries that still read 5.86V when I measure them. They are about 2" x 3" mounted on a heavyweight piece of paper that is 3" x 4". They have been kept at room temperature all the 20 years. It is amazing that after 20 years there is any charge left. I am wondering what chemistry Polaroid used in these batteries?
 
What number battery? P80, P100, P300, etc??
Size wise, I would guess(tm) a P100.
 
Possibly Zinc-Chloride.
<http://users.rcn.com/fcohen/P100.htm>
<http://users.rcn.com/fcohen/Polaroid.htm>
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
"Uffe Bærentsen" <leiti_FJERNES_@hotmail.com>: Jun 11 10:32PM +0200


> Actually it is pretty nifty. It is a module with a dual channel 50 watt audio amp self contained and smaller than a PCI card for your PC. you putin 120 VAC, the inputs and you got the outouts. It is a SMPS p[ower supply with a cass D amplifier all on one board. There are no heat sinks at all except the copper on the board.
 
The modules are quite nice :-)
 
> In this case, the two channels are wired in a BTL or bridged coinfiguration yielding 180 watts. It was in an Eden bass amplifier.
 
Be aware that there seems to be difference between the bridgeable and
non bridgeable versions.
The bridgeable is called 50ASX2BTL
 
 
 
--
Uffe
"Arfa Daily" <arfa.daily@ntlworld.com>: Jun 11 01:53AM +0100

<etpm@whidbey.com> wrote in message
news:0bkhna9d522r4k9003muofjdb5d1hb9pdk@4ax.com...
 
>>You have hit it in one :-)
> If I recall correctly a series wound AC motor will not reverse by just
> changing the wires to the brushes.
 
 
I think it will. A washing machine motor is a series connected AC type, and
to reverse it, the controller just reverses the connections to the
brushgear. In order for it to do this, the connections to both the field
winding and the brushes are brought out to the controller.
 
Arfa
captainvideo462009@gmail.com: Jun 10 06:38PM -0700

> We had to take apart a motor from a Rigid thickness planer to resurface the commutator. We reassembled the motor and as crazy as this sounds we think that its now running in reverse. If we inadvertently reversed the wires to the brushes would this happen? That seems to be the only variable here. Thanks, Lenny
 
I'm pretty sure that a typical washing machine motor for instance does not have brushes. I think that would make it an induction motor. I have some spare Maytag washing machine motors down in the basement that I liberated from machines at the town dump. They run at 1725RPM, (I think that speed is directly related to line frequency), and I don't think they have brushes either. They do however have centrifugal switches though. So I think that would that make that type of motor a compound type.
 
My tool motor has two wires coming out of the field that go directly to the AC line. On the other side of the field there are two more wires that go to the brushes. There is no centrifugal switch. And that's it, a very simple scenario. This one I think is a series motor. The other thing is that this Rigid motor spins at 9000 RPM. We're going to try to reverse the brush wires and see what happens. Thanks everyone for the replies. I'll let you know how it turns out. Lenny
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