Electronics Forum / Repair / November 2004

Does anyone have a schematic or know where I can get one for an  AB
MessageView 421F Thanks for any help, Ken

This 17 inch monitor turns on and has HV but the screen is completely black
for about 5 minutes.  Gradually, it brigthens up but the images look out of
convergence [?] - blurred, colors off, unreadable.
After about 30 minutes the picture is superb.  OSD works fine.

Model MDX C150 made for Japan use and FM band set to 76MHz to 90MHz, UK is
about 88 to 108 MHz
Monitoring the VT line to the tuner varies from 1.52V to 4.2V from end to
end of this band. 2 banks of 6 channels programmable in this 76 to 90 M

A musician friend recently got a second-hand Alesis DM5 drum module
which he said put out a very low sound level when he connected it to
the line input of an amp. I checked the output with a scope and it
gave an output of about mic level even at full volume. Since he needs

    Is Rubber Renue for DAT/VCR capstan/belt cleaning, the same as the spay
stuff they use for tires and vinyl cleansing?
    Please email as well if possible!
Bob

I got this monitor 2nd hand. It is not very bright. I've tried all of the
controls on the front. I have not opened the unit. I did download the
schematic. It seems everything is controlled by a computer. Is there
software that is needed to adjust this monitor? What's it called? ...

Hey :)
I have an old HD, not working.
(fujitsu thing)
Is there a tutorial out there on how to remove hard discs and replace

I'm trying to fix a set of Monsoon MH-505 computer speakers. These have
a subwoofer and 5 satellite speakers. The problem is that when you power
it up the subwoofer's cone pulls all the way in and you get a fairly
loud hum from it. The other speakers do seem to work, albeit not ...

 I have a problem  with stk6713bmk3 I cant not find it &I try to
making its equivalent circuit .it is an unipolar fixed chopper-type
4-phase stepping motor drive hybrid ic which uses a mosfet power
device I getting the data sheet from www.datasheetarchive.com it has

I have a Sony KV-32S42 TV that won't turn on anymore.  I tried both the
remote and the power button on the set and all that happens is the red
standy/timer light flashes.  No picture at all.  Reconnected the other
components to another TV and that works fine so I'm sure the ...

"A Philips  Hi-Fi that is connected to the Internet"
That is the vague description we have of a product.
Does anyone know what it is likely to be?
Graham.

I am looking for a good cheap source for generic EL panels for
some older equipment retrofit. Has anyone done EL panel replacement? Can
you just cut them down without damaging them?
How critical is the voltage range to drive them?

I have a couple of circuit boards that I want to repair.  They are two
versions of the same thing, although one is slightly newer by maybe a year.
There are some diodes that are toast although there is enough left to read
the markings.

unit works fine until warm then screen gets too bright with retrace lines
... can turn down screen voltage all the way but when its cold then its too
dark ...repair tips say c5002 , and c5004 on crt board  .... tuner grounds
have been done before , still holding ... any help would ...

I'm hoping someone has seen this problem...
Both channels pass dc voltage to speaker relay, thus keeping unit in protect
mode.
One channel was passing +43vdc, the other -43vdc.