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Old 02-13-2018, 02:19 PM   #30
seve91
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Join Date: Oct 2013
City & State: AN
My Country: Italy
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Default Re: Philips FR-740 working but no audio output

Quote:
Originally Posted by R_J View Post
That is because the scope is not grounded, if you place the probe anywhere you will see that, if you touch the probe with your finger you will see that also
Didi you ever check the voltage on (page 78) transistor 7253, base should be 0 collector 5 volts or measure on (page34) plug 1426 pin 2

Did you ever run the Service Test Program ? (page 27) and (page 28) various other tests, and run those two tests, the last one should reset to factory.
yes 0V on E and B of 7253, 5.12V on C of 7253 and pin 2 of plug 1426.
Done all the tests, all is ok except for tuner test. If i press TUNER it goes immediately in tuner mode (it exits from service mode instead of doing the test, but with headphones i'm sure that tuner is working good, i can listen to the radio).
Done the factory reset, but still no audio.
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