Tuner Sansui T-E75 intermitent fail

[Jlores]

Hello,

I have a Sansui tuner for repair, with ic LA1265.

I was change all electrolytics, the la1265 ic and get the same fail, intermitent reception on AM and FM bands, but only receive about 30seg and stop.
Any idea?

Many thanks, I don't find the scheme

 

[Delta Prime]

I have a Sansui tuner for repair, with ic LA1265

I am an electronic technician so as a professional courtesy, I will point you in the right direction.
We all gotta make money.
It’s your IF amplifier and quadrature detector. It’s on your receiver front end.
On the schematic, dIcI

https://elektrotanya.com/sansui_t-7_t-5_am-fm_tuner.pdf/download.html#dl

 

[Jlores]

Hello,

Thanks for your help, but this receiver It's different from that scheme. This one has La1265 for AM/FM. TC9182 as pll and BA1332 as stereo decoder.

It fails both in AM and FM, it has me lost. On pin 8 of the la1265, when it fails it doesn't go low, so it doesn't detect a station.



Best regards

 

[Jlores]

Hello,

I was found the problem in ceramic filter, pin 15/17 of the LA1265

Now I have a problem with the sound, when the lock led lights, the sound is like metallic. And the auto seach led don't off