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Aiwa AD6900 tape deck of about 1980, light sensitivity

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

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Reply to
N Cook
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I dont know the deck, but this is very unlikely.

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

Reply to
meow2222

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.

Reply to
James Sweet

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

-b.

Reply to
b

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

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Reply to
N Cook

first

lighting.

service

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

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Reply to
N Cook

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