Re: Relisys TE770 monitor

"N Cook" <diverse@xxxxxxxxx> wrote in message
news:do3i4u$dl8$1@xxxxxxxxxxxxxxxxxx
> "N Cook" <diverse@xxxxxxxxx> wrote in message
> news:do1iat$s22$1@xxxxxxxxxxxxxxxxxx
> > Only 3 years old, LED blinking and relay clicking on and off.
> > The "on/off" switch short circuits the mains SMPS side of the opto
> isolator
> > to switch "off" the monitor, bit unusual.
> > Disabled the line output drive and running from 50 percent mains
> > and same clicking/ticking.
> > Stable 7V or so on the driver side of the opto-isolator
> > and a 7805 gives a stable 5V for the micro area.
> > PS Ds and Cs seem ok
> > Any ideas where to look other than tracing back from the relay, LED area
> and
> > back to the
> > PS rails.
> >
> > --
> > Diverse Devices, Southampton, England
> > electronic hints and repair briefs , schematics/manuals list on
> > http://home.graffiti.net/diverse:graffiti.net/
> >
> >
> >
>
> A schematic for this monitor is on
> http://www.eserviceinfo.com/index.php?what=search2&searchstring=TE770
>
> Now I've found out what RAR file types are and downloaded
> Hervé Thouzard 's " UnzipThemAll " to pdf
>
>
>
>

A 12 V line is dragged down that goes to the LM2467 on the back of CRT
sub-board
>From NS
"The LM2467 is an integrated high voltage CRT driver circuit designed for
use in color monitor applications. The IC contains three high input
impedance, wide band amplifiers which directly drive the RGB cathodes of a
CRT. Each channel has its gain internally set to -20 and can drive CRT
capacitive loads as well as resistive loads present in other applications,
limited only by the package's power dissipation.

The IC is packaged in an industry standard 9-lead TO-220 molded plastic
power package. See Thermal Considerations section.
"

Disconnecting that line the 12V comes up stable and the protection relay
stops clicking.
Any known generic problems with this IC ?


.

Relevant Pages

  • Re: Relisys TE770 monitor
    ... LED blinking and relay clicking on and off. ... > to switch "off" the monitor, ... > and a 7805 gives a stable 5V for the micro area. ...
    (sci.electronics.repair)
  • Relisys TE770 monitor
    ... LED blinking and relay clicking on and off. ... The "on/off" switch short circuits the mains SMPS side of the opto isolator ...
    (sci.electronics.repair)