Electronics Forum / Repair / January 2005

I´ve been given an old long range cordless telephone. The base station
takes two antennas (transmit and receive) but only came with the RX
antenna. I can make a homebrew TX antenna but need to know the
transmission frequency in order to do so.

I am aware of the precautions necessary considering the high voltage. I am
trying to determine if this dark LCD screen on a Compaq Presario 900 is the
result of a bad lamp or if it is the inverter. I have the tube exposed and
have measured 2200v start up voltage, then after a ...

Sony KV2680R floor model T.V. was "worked on"
elsewhere! R187 by vhf tuner is missing! Anyone
have the value? It's dead, but I want to put it as it
was first! Any links to a schematic? It's in very good

CAN ANYONE OUT THERE ADVISE ME AS  HOW ONE CAN CHANGE THE PITCH % TO A
HIGHER VALUE ON THE DENON DN-2000F MK1,ANY INFO WELCOME
HELP!!!
CAPE TOWN ( SOUTH AFRICA )

Having a little trouble getting our vs459 through a doorway.  Is it
possible for the black back cover to be removed so the TV can be
positioned through a 26" doorway?
regards,

I just purchased an old Commodore 1902 monitor (analog RGB/digital RGBi
15Khz built in 1985) to replace a similar Commodore 1084D monitor.  The
previous owner had it in storage for some time. The monitor will turn itself
off (apears to look just as though I physically turned it off. ...

I am trying to repair a monitor from a CNC machine control console. It
is a 14" monochrome VGA monitor. The board is relativly simple,(only 1
IC, a V sweep generator, all the rest of the components are discreet)
and I have HV sweep, etc. The video comes in on the "Green" line, and

I have a JVC 27" early to mid nineties AV-(oops forgot).
It had a vertical collapse problem, and then with help from this group
(especially "Wizard") I fixed that.
Now, it does this thing where it loses blue, except for a dark purple

Hi, I've been trying to get some information in general on these appliances,
like efficiency and safety and stuff.  But not been able to form a yes no
opinion so far from scant stuff I have found so far.  Like what is different
about these tubes to ordinary lighting halogen tubes, ...

My Mitsu VS-50703 will not turn on.The green power light comes on for a
second and goes out. This is the second time this has happened over a four
year time frame. The last time, the tech said he had to replace the entire
motherboard. Can a non-tech (me) obtain and replace a ...

I have got an IBM G50 monitor, which works well some of the time.
Every once in a while it looses the picture and the screen goes dead.
If I hit it on the caseing just behind the tube then it flickers back
on for about 3 seconds, then goes dead again. Once this happens I have

Can anyone tell me of a low cost way to get digital tv on analog tvs. Cable
is not available in my area and I don't
know where I can get a low cost converter.  Thanks, Mac

I have a BYTEK S15-F Multiprogrammer, but cannot find a source for
manuals/software. Does anyone know where these can be downloaded, or
does anyone have originals they could copy for me? I'd really
appreciate it and I would be more than willing to paypal you a few

I was able to scrounge a motor from a 14 year old Realistic machine and
I got this unit working. I'm keeping it for myself. I was wondering if
in all those dead Sonys floating around out there if someone might have
a remote to go with my machine. The remote number is: RMT-D108A-R. ...

I managed to repair my mates old mp3 player and bought it off him for
my daughter.
He couldn't find the PSU so I setup and tested one of those voltage
and polarity setable jobbys.