Electronics Forum / Repair / June 2008

Hi all. I had a shorted driver stage (MJE15032/33) in one of the
channels which resulted a lot of open resistors in the output stage,
Some components in the clip-detector circuit blew too. After replacing
all the broken stuff, the channel operates, but with high frequency

I havea mitsu 55 inch hd tv for about 6 moths I have been getting
green bars on the l and r side of the screen . I would shut the tv off
and then turn it back on and it was ok. Then about 2 months ago the
problem went away. Now , a week ago the problem came back and will not

J&R music world in Park Row, NY, NY
I urge all the shoplifters to go there and steal what you can. They
steal from their customers so it would be karmic justic

I have two of these beasties, both JVC 42" plasmas made at about the
same time.
Unfortunately, one has a burned out PDP (has big black line on the
screen about 1/3 the way across and halfway down the screen) and the

As the subject says, I have a Denon PMA 250 with an open circuit mains
transformer primary - no doubt the thermal protection has failed. Can
anyone tell me the secondary voltage?
RonUK

For appearance and modern day use in a vintage vehicle.
That is adding an FM IC inside somewhere rather than RF converter plugged in
aerial socket.
Assuming there is somewhere around the volume control to switch out the AM

My HP LaserJet 4 all of a sudden started printing black over the whole
page. Beneath the black I can see that the image I'm printing is
transferred onto the page, but it is mostly obscured by the toner
stuck onto the page all over.

I understand most of this is older/obsolete/common/overfilling everyone's
shelves/etc.. so don't bother informing me of this. I have multiple
quantities of some and all are brand new I have no use for them so I would
rather them go to somebody who can use any or all of them:

In my efforts to restore my Stargate, I've noted one on eBay.  It states
the size as 24 1/2" x 7 1/2".  Since I don't have it here to measure, I
want to make sure this is right before I plunk down cash for something that
won't fit.  Is this right, or did someone cut down an ...

We have a customer who owns a series of 24 and 30 unit apartment
buildings. Presently on each floor as per local requirements there are
several self contained emergency lighting units. Some of these are
equipped with a small 6V battery and just two low voltage lamps that

I have had it for decades but I do not want to give it up because it
works fine withstand the popping and hissing it does in all modes
except off.  Is it over for it?

I need some advice.
I am restoring Pac-Man Mini arcade game with an Electrohome G07-FB0 13" CRT
Monitor. This is for my own use.
I would like to replace the CRT with one from an older 13" VGA monitor, I

My laptop no longer charges the battery. I need a motherboard
schematic or at least somebody that knows what 'normally' dies in that
circuit. There is a current sense resistor in the charge path, and
some FETs that i cannot find a datasheet for. There must be some

OK, this is a problem with a 19" Citizen TV. It is just over a year old.
If the set is put on a stand that has a metal object (like a Satellite
Receiver on a shelf) mounted within 8 inches below the set, the pic has
a very noticeable purity problem all the way across the bottom ...

Is there a site with the tube complement of ancient Tektronix 'scopes,
the ones from the 50s and 60s? I thinking of the 514 and the 516 in
particular. There may be other Teks with those model numbers, but
these are getting way back there. The 516 has the traditional blue,