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Search: Posts Made By: seve91
Forum: Troubleshooting Audio Equipment 02-27-2018, 05:49 AM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

i don't know...maybe you're right.
For sure I don't have so much experience... I go on with attempts.
The amplifier is not mine, the owner is a friend.
If she wants to bin it, then i will take it...
Forum: Troubleshooting Audio Equipment 02-26-2018, 12:19 PM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

sorry friend, i've just reassembled it. I give up.
Too much time wasted, and can't find a solution still.
Thanks to you for all your kindness and patience, your tips were useful to improve my...
Forum: Troubleshooting Audio Equipment 02-26-2018, 08:02 AM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

No still no audio :( voltage on CCC too high, don't know why. Without transistor, C of 7310 is -37.7V.
Tried replacing cap 2350 without success
Forum: Troubleshooting Audio Equipment 02-25-2018, 06:08 AM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

replaced 7309, 7304, 7310, 7902, 7909. same voltages remain.
Could be a bad capacitor somewhere? Why the voltage is too high?
Forum: Troubleshooting Audio Equipment 02-18-2018, 03:02 PM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

i know that the voltage on C of 7309 is wrong, but i don't know how to fix it.
I'm trying to desolder and test.
Desoldered cap 2365, nothing changed. Cap tested with ESR meter, is good.
Resoldered...
Forum: Troubleshooting Audio Equipment 02-18-2018, 02:21 PM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

base 7902 = -40V

so what could be the next step? try replacing a transistor?
Forum: Troubleshooting Audio Equipment 02-18-2018, 09:56 AM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

the resistors are all SMD and all are in good conditions.
Voltages:
3329: -39.6V (B of 7304) and -1.44V (C of 7309)
3936: -39.8V (B of 7909) and -38.15V (to 4910)
3918: -40.28V (to 3935) and...
Forum: Troubleshooting Audio Equipment 02-14-2018, 03:23 PM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

these are the voltages measured:

7309: E= 3.4V, B= 3.05V, C= -1.4V
7304: E= -40.3V, B= -39.6V, C= -40.3V
7902: E= -40.3V, B= -39.6V, C= -40.3V
Forum: Troubleshooting Audio Equipment 02-14-2018, 03:14 AM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

Yes exactly, test = pass and format = new.
Tried to connect anode 6305 AMP IR ON to AMP S ON that was at 5.2V, but now they are both 0.4V

I tried also to desolder the anode from the mainboard to...
Forum: Troubleshooting Audio Equipment 02-13-2018, 02:19 PM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

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...
Forum: Troubleshooting Audio Equipment 02-13-2018, 12:46 PM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

and how i can find the fault?

I found out a strange thing when measuring pin 6 with the oscilloscope probe.
If i connect the ground of the probe to the chassis of the device, i got 0V.
If i...
Forum: Troubleshooting Audio Equipment 02-13-2018, 12:15 PM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

Pin1,2,6 of IC7412 are 0V. So i need to replace the CPU 7415?
Forum: Troubleshooting Audio Equipment 01-25-2018, 12:48 AM
Replies: 13
Views: 642
Posted By seve91
Re: Old Lenco R600 Stereo

which contact grease do you advice? I was thinking about WD40 :)
Why is not suggested?
Forum: Troubleshooting Audio Equipment 01-23-2018, 03:34 PM
Replies: 13
Views: 642
Posted By seve91
Re: Old Lenco R600 Stereo

looks like that all these contact cleaners evaporate without residue.
Anyway i've bought it from US, i hope to fix the issue because it's impossible to find the replacement for the volume/balance pot
Forum: Troubleshooting Audio Equipment 01-22-2018, 02:19 PM
Replies: 13
Views: 642
Posted By seve91
Re: Old Lenco R600 Stereo

buying it from Italy is quite expensive. If is that good as you said, i'll buy it.
Otherwise if you can advice me a "local" alternative products would be better.

thanks

EDIT: Bought from the...
Forum: Troubleshooting Audio Equipment 01-22-2018, 12:33 AM
Replies: 13
Views: 642
Posted By seve91
Re: Old Lenco R600 Stereo

I used this one, almost everywhere on the board and on the controls.

http://www.duecielectronic.it/index2.php?lang=eng&menu_1=prodotti&menu_2=G-22&cat=pulizia

I will try deoxit, but there are...
Forum: Troubleshooting Audio Equipment 01-21-2018, 01:18 PM
Replies: 13
Views: 642
Posted By seve91
Re: Old Lenco R600 Stereo

thank you all for the answers.
I've already replaced some caps, also C119 and C120.
The only one i didn't replace was the C108....it's a 47uF capacitor.
Desoldered, is measuring 25pf...replaced...
Forum: Troubleshooting Audio Equipment 01-20-2018, 11:36 AM
Replies: 13
Views: 642
Posted By seve91
Old Lenco R600 Stereo

Hi everyone,
got this old lenco R600 Stereo Receiver. It has worked good for all these years. Last 31st December i used it for a few hours to listen to the music.
Was working good, except for the...
Forum: Troubleshooting Audio Equipment 10-15-2017, 10:59 AM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

Yes i can turn MUTE on and off with the remote. In the menu there are not many options...volume is balanced to 0 for all the speakers.
Forum: Troubleshooting Audio Equipment 10-08-2017, 04:30 AM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

so this means that the AMP is in protection due to a short or something?
Forum: Troubleshooting Audio Equipment 10-07-2017, 03:47 AM
Replies: 46
Views: 1,767
Posted By seve91
Forum: Troubleshooting Audio Equipment 10-06-2017, 04:44 PM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

Pin 6 always 0, pin 7 alway 4.9V
Forum: Troubleshooting Audio Equipment 10-06-2017, 02:47 PM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

Yes, both leds are working ;) DVD is on when input 6CH/DVD is selected. SURR is on when you push surround button (surround is not available in 6CH/DVD mode)
Forum: Troubleshooting Audio Equipment 09-30-2017, 12:01 PM
Replies: 46
Views: 1,767
Posted By seve91
Forum: Troubleshooting Audio Equipment 09-26-2017, 02:35 PM
Replies: 46
Views: 1,767
Posted By seve91
Re: Philips FR-740 working but no audio output

ok, page 79:
A of 6305: 0V
K of 6305: 3.2V
C of 7309: 0.04V
C of 7304: -41.5V
C of 7310: -41.5V
Showing results 1 to 25 of 67

 
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