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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 4th May 2021, 9:07 pm   #1
SPEEDLINE
Diode
 
Join Date: Sep 2007
Location: Wirral, Merseyside, UK.
Posts: 2
Default Sony TA E1000ESD issues

I’m trying to restore a Sony ta e1000esd pre amp , it’s in amazing physical condition , however it won’t output any sound unles it’s in Dolby surround mode , and even then only the front 3 channels , in all other modes , there’s no sound output at all, another fault , and I’m not sure if it’s linked , is that all the inputs seem to be linked , I.e I can plug a certain player into the cd inputs and press the tuner button to select the tuner input , and the cd sound is still heard , and vice versa if I plug a tuner in and press the cd source button I can still hear the tuner .
It also sounds a bit distorted for the first minute or so when I switch it on , then when it’s warmed up it sounds perfect.
Any help would be massively appreciated, I have the service manual and a small amount of electronics knowledge
Thanks in advance 👍
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Old 10th May 2021, 5:50 pm   #2
Analogue man
Hexode
 
Join Date: Dec 2020
Location: Raunds, Northamptonshire, UK.
Posts: 339
Default Re: Sony TA E1000ESD issues

I would clean all the switches with switch cleaner as a good starting point.
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Old 11th May 2021, 12:48 pm   #3
Beobloke
Heptode
 
Join Date: Oct 2007
Location: Southampton, Hampshire, UK.
Posts: 816
Default Re: Sony TA E1000ESD issues

There aren't really any switches to speak of as it's all electronically controlled.

Function switching is carried out by an LC7821 analogue switch IC, so there's a good chance this has failed.
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Old 13th Jun 2021, 5:17 pm   #4
SPEEDLINE
Diode
 
Join Date: Sep 2007
Location: Wirral, Merseyside, UK.
Posts: 2
Default Re: Sony TA E1000ESD issues

Thank you.

I have managed to source a replacement IC for this so will give it a try and report back.
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