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Success Stories If you have successfully repaired or restored a piece of equipment, why not write up what you did and post details here. Particularly if it was interesting, unusual or challenging. PLEASE DO NOT POST REQUESTS FOR HELP HERE!

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Old 7th Jun 2022, 6:17 pm   #1
Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 3,224
Default Pioneer TX 7500 tuner repair

This tuner came in from a friend ,it belonged to a good friend of his , who is suffering from terminal lung cancer ,so this one took priority , on plugging in I was greeted with the usual fm noise as if it was working ,I soon found out it wasn't , there was 12 volts on the tuning heart , so remover the module ,tied the tuning drum down so I didn't have to re string it , the rf amp transistor read ok , just to be sure applied a strong sig to the output of that stage ,still no sig , next step checked if the osc was running and tuning with the scope all ok , luckily the mixer transistor wasn't to bad to get at ,having removed it 2SC535 ,it was found to be oc all round , fitted a replacement now we have stations , you do need a 100 watt iron to remove the screening , It is now with the owner a small thing that made him happy for a while . Mick.
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Last edited by vinrads; 7th Jun 2022 at 6:26 pm.
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Old 7th Jun 2022, 6:50 pm   #2
paulsherwin's Avatar
Join Date: Jun 2003
Location: Oxford, UK
Posts: 24,122
Default Re: Pioneer TX 7500 tuner repair

Nice story, well done.
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Old 21st Jun 2022, 2:32 pm   #3
Uncle Bulgaria
Join Date: May 2016
Location: Cornwall, UK.
Posts: 1,643
Default Re: Pioneer TX 7500 tuner repair

A hundred watt iron looks like a minimum! I'm impressed by the logical, clear fault-finding leading to a good result.
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