Re: 3 cd stereo


"Meat Plow" <meat@xxxxxxxxxxxxxx> wrote in message
news:11lvcg.kv3.19.1@xxxxxxxxxxxxxxx
On Mon, 25 Jun 2007 14:34:45 +0000, Arfa Daily wrote:


"Meat Plow" <meat@xxxxxxxxxxxxxx> wrote in message
news:11kso9.8um.17.1@xxxxxxxxxxxxxxx
On Mon, 25 Jun 2007 09:29:02 +0000, Arfa Daily wrote:


"jon" <jonny2bye4@xxxxxxxxx> wrote in message
news:1182738006.866140.69130@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
i found this 3 cd stereo and having some troubal with it. its used but
tapes and the raideo work on it. the problem is the cd player. when i
try to play any cd in the cd player nothing happens. its a weird
brand, i think its aiwa but am not sure. any help would be helpfull.


Aiwa is not a weird brand. It is part of the Sony group, and is very
common.
The most likely thing on one of these - assuming that it's one of the
carousel models - is that the laser lens is very dusty. In their
heyday,
I
used to do probably 4 or 5 a week. Cleaning the lens - properly , that
is,
not with a 'CD lens-cleaner disc' - will restore one of these in 7 out
of
10
cases. Failing that, you're probably up for a replacement laser. There
are a
couple of other potential issues which have been known to stop one
working,
but they are very rare. The decoder / deck drive electronics are
generally
very reliable on them. If you do have to get a replacement laser, make
sure
that you get the right one. KSS 213B is the commonest (and cheapest),
but
they have also had '213C, '213D, and '213E fitted. They don't like
having
the wrong one in them. None of them is expensive as lasers go, but I
would
warn against using the real 'cheapies' in these units, particularly if
it's
not a '213B, as in my experience, operation can be a bit marginal with
a
less than full spec laser fitted.


Very nice post indeed Arf, but I doubt anyone who thinks Aiwa a weird
brand has the potential to do anything but swab the laser if he/she can
even do that :)


Hi Meat - how's it a'goin?

That did occur to me too, but I thought it was a nice example of 'one of
those' questions relating to what is actually a very common stereo with a
very common problem, and I thought it might serve as a useful vehicle for
one of those magazine type "Uncle Arfa Answers ... " responses that could
be
useful to others with a bit more experience ;~}

Arfa

LOL Uncle Arfa's Answers. I'll archive these from time to time just in
case a friend or someone asks me a question here. I basically dropped that
line of stuff years ago and focused on vintage tube guitar amps for my
brother in law's music store. He's kind of nuts and will buy these off the
wall tube amps from street walk ins. I worked on an Alamo Montclair 1x12
he bought from a walk in. Needed some minor things, tube, resistor, etc...
Nice little 22watt amp, great for blues as it breaks up nicely for that
tube amp distortion before it gets too loud. Myself the smallest amp I
have is a Laney Pro Tube 50 watt that sounds like a 100 watts. The rest of
my tube amps are all 130+ watts RMS :)


I do a lot of guitar amps as well for the music store in the village where I
live. I have just today been doing a Studiomaster 400 mixer / amp that had
the LED bars both illuminated and behaving very oddly, and no output from
either main output channel. I had to shell out $20 for a schematic-set
download. The two final mixdown boards, are the same, but different ... !!
One uses opamps with a standard 8 pin DIL package, and the other uses
different opamps in 8 pin SILs. I've never managed to find anyone here who
supplies those SIL opamps. Oddly, the same stage was faulty on both boards,
and I suspect that something nasty must have been jacked into the insert
sockets. I replaced both chips, using a standard DIL standing on end with
wires to the other four pins, for the SIL one. That restored all the mixer
functions, only to find that one power amp didn't work. There are 8
transistors blown, and the reason it just sits there quietly with no blowing
fuses or flames, is that it's full of safety R's, which are all open
circuit.

Last week I did a Marshall with both output IC's blown to pieces. They are
the size of something in a car radio, and have 96v across them !!! I also
had another Marshall that had three 5.3 ohm speakers in series in the cab -
very odd arrangement to make up 16 ohms. One of the speakers was short
circuit, and someone had screwed about with the wiring to try to compensate.
The new speaker sent by Marshall was an 8 ohm - so much for their clever
impedance calculations. When all fitted, the amp output seemed low, and
lacking in 'zing'. Turned out a screen feed R on one of the output tubes was
open. Sounded a treat when it had been replaced.

I don't know about you, but I find this interesting and varied work, and
there doesn't seem to be too many of us about still doing it - particularly
on tube equipment. All of the young engineers and fellow radio hams that I
know, are terrified of tubes and the high voltages involved, and won't go
near them. I make up the rest of my work with hifi equipment - some of it
very high end from the nearby town's last remaining 'proper' specialist hifi
store, and some of it basically junk, that comes to me through the last few
independant retailers in the area. I only do trade work, as I can't be
bothered with whining customers. I also have a 'commercial' contract to
repair pcb's from drinks vending machines. No service info, but I rev-eng'd
one a long time ago, and built a jig to test every function very rapidly.
Takes me about 10 seconds to test and diagnose each board. VERY boring and
repetitive work, but good bread and butter money for the business.

Arfa


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