Useful extra user functions , so owner wants repair
Does anyone know if the r/c receiver marked "sensor" also has a function
controlling the lamps on the front, for varying room lighting?
R/C tr and rx are both early almost discrete components

This deck stopped responding to the r/c.
Transmitter was ok , receiver diode ok but nothing coming out of the first
op amp. The o/p is dc coupled to the next stage.
Replaced the LF357 and m/c works all functions but only in subdued lighting.
If room light is too bright then there is not even manual control of the
deck functions let alone the r/c, kill the room lighting and normal service
is resumed.

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

N Cook wrote:

Useful extra user functions , so owner wants repair
Does anyone know if the r/c receiver marked "sensor" also has a function
controlling the lamps on the front, for varying room lighting?

I dont know the deck, but this is very unlikely.


R/C tr and rx are both early almost discrete components

This deck stopped responding to the r/c.
Transmitter was ok , receiver diode ok but nothing coming out of the first
op amp. The o/p is dc coupled to the next stage.
Replaced the LF357 and m/c works all functions but only in subdued lighting.
If room light is too bright then there is not even manual control of the
deck functions let alone the r/c, kill the room lighting and normal service
is resumed.

not using fl lighting by any chance are you? I'm thinking if the tx is
discrete it wll be as simple as poss, an the system might be struggling
with heavy 100Hz flicker. Perhaps... the manual function lockout might
perhaps be due to it seeing a signal from the room lighting, though not
one that gives it any recognisable command. Kinda waving finger in air
here, someone might actually know, but its something easy to check for.


NT

not using fl lighting by any chance are you? I'm thinking if the tx is
discrete it wll be as simple as poss, an the system might be struggling
with heavy 100Hz flicker. Perhaps... the manual function lockout might
perhaps be due to it seeing a signal from the room lighting, though not
one that gives it any recognisable command. Kinda waving finger in air
here, someone might actually know, but its something easy to check for.




Even more commonly causing issues are CFLs, which use electronic
ballasts and flicker in the KHz range, occasionally being close to the
frequency of the IR system.

N Cook wrote:
Useful extra user functions , so owner wants repair
Does anyone know if the r/c receiver marked "sensor" also has a function
controlling the lamps on the front, for varying room lighting?
R/C tr and rx are both early almost discrete components

This deck stopped responding to the r/c.
Transmitter was ok , receiver diode ok but nothing coming out of the first
op amp. The o/p is dc coupled to the next stage.
Replaced the LF357 and m/c works all functions but only in subdued lighting.
If room light is too bright then there is not even manual control of the
deck functions let alone the r/c, kill the room lighting and normal service
is resumed.

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

quick botch may be to add some layers of dark filter mateial over the
remote sensor on the machine to reduce sensetivity??
-b.

James Sweet wrote in message
news:ABo6h.1462$Jd3.802@trnddc07...


not using fl lighting by any chance are you? I'm thinking if the tx is
discrete it wll be as simple as poss, an the system might be struggling
with heavy 100Hz flicker. Perhaps... the manual function lockout might
perhaps be due to it seeing a signal from the room lighting, though not
one that gives it any recognisable command. Kinda waving finger in air
here, someone might actually know, but its something easy to check for.




Even more commonly causing issues are CFLs, which use electronic
ballasts and flicker in the KHz range, occasionally being close to the
frequency of the IR system.

Fluorescent light may well have something to do with it , exploring further.
No room light CFL and shining bright torch at the sensor does not affect the
function control but rapidly moving the torch back and forth can set it off.
In that state a continuous 1KHz pulse train until switching off and on.
So some instability in there around the 555 , I'll change the 555 and all
the
electrolytics first of all methinks.

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

b wrote in message
ps.com...

N Cook wrote:
Useful extra user functions , so owner wants repair
Does anyone know if the r/c receiver marked "sensor" also has a function
controlling the lamps on the front, for varying room lighting?
R/C tr and rx are both early almost discrete components

This deck stopped responding to the r/c.
Transmitter was ok , receiver diode ok but nothing coming out of the
first
op amp. The o/p is dc coupled to the next stage.
Replaced the LF357 and m/c works all functions but only in subdued
lighting.
If room light is too bright then there is not even manual control of the
deck functions let alone the r/c, kill the room lighting and normal
service
is resumed.

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

quick botch may be to add some layers of dark filter mateial over the
remote sensor on the machine to reduce sensetivity??
-b.


Seems as it was an early IR r/c it just lacks discrimination .
Its not used with a flourescent roomlight but if it was then a matt black
rubber cone over the sensor boss would allow it to be used.

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