Sony DAT Recorder DTC-1000ES No Function
 

I have a sony dat recorder dtc1000es that shows no life at all when
switched on but all the power supply voltages read ok. There is
nothing on the display and the eject button does nothing. In response
to a tip on the euras database i changed all the 10uF caps on the drum
pcb but still nothing. Have checked that all the boards seem to be
getting power (the psu voltages are only marked on the psu board). Am
a bit mystified - could this be a dew sensor problem? - no sign of and
obvious dew sensor. Any help would be appreciated - thanks.

Sony DAT Recorder DTC-1000ES No Function
 

neilish wrote in message
oups.com...
I have a sony dat recorder dtc1000es that shows no life at all when
switched on but all the power supply voltages read ok. There is
nothing on the display and the eject button does nothing. In response
to a tip on the euras database i changed all the 10uF caps on the drum
pcb but still nothing. Have checked that all the boards seem to be
getting power (the psu voltages are only marked on the psu board). Am
a bit mystified - could this be a dew sensor problem? - no sign of and
obvious dew sensor. Any help would be appreciated - thanks.


Is there a tape inside and its gone into protect mode?
The multi-pole magnet motors in these are notorious for failing in a
characteristic way

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

Sony DAT Recorder DTC-1000ES No Function
 

Checking the outputs from the power supply again i could not seem to
see a power on reset pulse on the reset line on my scope (its a pretty
basic model but i should be able to see a reset). There were two more
10uF 16v caps in the power on reset circuit on the psu board and they
had gone open. Replaced them and the thing powered up normally . The
uP was waiting for a power on reset i reckon - anyway seems fine now .
Thanks for your help - Neilish.