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Service Manuals, Circuit Diagrams and Data Sheets Wanted If you need help finding service data post a message here. Please do not request or offer data that is available from www.service-data.com |
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29th May 2023, 8:31 pm | #2 |
Octode
Join Date: Sep 2020
Location: Thetford, Norfolk, UK.
Posts: 1,731
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Re: Sony Walkman Service Manual
I can help with this. Will PM you.
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10th Jul 2023, 2:29 pm | #3 |
Octode
Join Date: Aug 2015
Location: Glasgow, UK.
Posts: 1,840
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Re: Sony Walkman Service Manual
With help and support from Forum Member agardiner (Adrian) i have made slow but steady progress with repairing this Sony Walkman WM-B15.
Repairs to broken tracks have brought the motor back to life but there are issues on the audio side that we have traced back to the LA4570 IC (IC301 on the Service Sheet). I cannot, however, find a source for a replacement SMD LA4570 IC although 16 Pin DIL versions are available from Cricklewood. This is the IC in question but very unsure about the package type:- If a replacement cannot be found how do I go about finding an equivalent?
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10th Jul 2023, 7:26 pm | #4 |
Dekatron
Join Date: Sep 2006
Location: Kilmarnock, Ayrshire, UK.
Posts: 5,420
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Re: Sony Walkman Service Manual
No equivalent as far as I can see. A lot of chips have gone obsolete over the years unfortunately with no direct equivalent, some chips are just made for the particular device especially if it's a high volume production run. My advice to anyone doing repairs is to check supply of parts before going too far, it's very discouraging when all the time you spend is wasted due to obsolete parts.
Before all is lost try eBay. Certainly in the early 90's these were still coming in for repair when I worked with Sony. It wasn't the top of the range but not the bottom end which were just exchange models, it hailes from 1985, parts were only supplied for 10 years until stocks would be exhausted, hence the reason they are hard to get
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Cheers, Trevor. MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member Last edited by murphyv310; 10th Jul 2023 at 7:34 pm. |
10th Jul 2023, 8:43 pm | #5 |
Octode
Join Date: Aug 2015
Location: Glasgow, UK.
Posts: 1,840
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Re: Sony Walkman Service Manual
Thanks Trevor
I was progressing quite well with this and had narrowed down the audio issues to the LA4570 IC. I note what you say i.e. "My advice to anyone doing repairs is to check supply of parts before going too far, it's very discouraging when all the time you spend is wasted due to obsolete parts" but as it's my first foray into Walkman territory I had no idea what to expect. I undertook the usual online searches including this and other Forums but there were no instances I could find of a faulty LA4570 IC.
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10th Jul 2023, 9:42 pm | #6 | ||
Dekatron
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Re: Sony Walkman Service Manual
Quote:
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Cheers, Trevor. MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member |
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