What be it ?
in the ps area of a Casio WK 3000 6 octave keyboard, of 2003 probably.
marked D for diode on overlay , only 2 of the 3 pins connected and diode and
resistance test to the other 2 pins probably o/c so n/c ?
Not SMPS or any reason to be epitaxial, fast recovery diode
***** for visibility against the background fug

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

N Cook wrote in message
...
What be it ?
in the ps area of a Casio WK 3000 6 octave keyboard, of 2003 probably.
marked D for diode on overlay , only 2 of the 3 pins connected and diode
and
resistance test to the other 2 pins probably o/c so n/c ?
Not SMPS or any reason to be epitaxial, fast recovery diode
***** for visibility against the background fug

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



Probably a 5V, 10W (with heatsink) zener diode

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

On Sat, 15 Mar 2008 10:41:47 -0000, "N Cook" put
finger to keyboard and composed:

N Cook wrote in message
...
What be it ?
in the ps area of a Casio WK 3000 6 octave keyboard, of 2003 probably.
marked D for diode on overlay , only 2 of the 3 pins connected and diode
and
resistance test to the other 2 pins probably o/c so n/c ?
Not SMPS or any reason to be epitaxial, fast recovery diode
***** for visibility against the background fug

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



Probably a 5V, 10W (with heatsink) zener diode

It would help to know where in the circuit it is located and to which
components it is connected. If it is connected across the incoming
supply (from a DC power pack?) then it could be a transient voltage
suppressor, and/or a reverse polarity protection diode. The numbers
would suggest that it may be a 20A (?), 2A, 3A, 30A, 30V, 20V (?),
200V (?) part. The "S" may suggest Schottky, although that would be
unusual in a linear PS.

FWIW, Teccor makes an S2003L 3A 200V SCR in a TO-220AB package, but I
would think that it would be useless without all three pins. Otherwise
it could have been used for overvoltage crowbar protection.

It may help to put a photo on your web site.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

Franc Zabkar wrote in message
...
On Sat, 15 Mar 2008 10:41:47 -0000, "N Cook" put
finger to keyboard and composed:

N Cook wrote in message
...
What be it ?
in the ps area of a Casio WK 3000 6 octave keyboard, of 2003 probably.
marked D for diode on overlay , only 2 of the 3 pins connected and
diode
and
resistance test to the other 2 pins probably o/c so n/c ?
Not SMPS or any reason to be epitaxial, fast recovery diode
***** for visibility against the background fug

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



Probably a 5V, 10W (with heatsink) zener diode

It would help to know where in the circuit it is located and to which
components it is connected. If it is connected across the incoming
supply (from a DC power pack?) then it could be a transient voltage
suppressor, and/or a reverse polarity protection diode. The numbers
would suggest that it may be a 20A (?), 2A, 3A, 30A, 30V, 20V (?),
200V (?) part. The "S" may suggest Schottky, although that would be
unusual in a linear PS.

FWIW, Teccor makes an S2003L 3A 200V SCR in a TO-220AB package, but I
would think that it would be useless without all three pins. Otherwise
it could have been used for overvoltage crowbar protection.

It may help to put a photo on your web site.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

It was just one of those things in passing. Inspecting the ps and pa boards
for any other potential problems, came in due to failing contacts on the
headphone socket, left speaker cutting out.

If I find something like that , unfamiliar or odd, and googling fails to
elucidate, I try and find out what it is.
All elese functioning perfectly, but seemed odd using 2 of 3 pins. A nice
stable 5V over the 2 pins in the ps area, so that was my assessment.
No heatsink used on this one but a useful TO126 format for say 10W zeners
that are
bolt-downable

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/