Hi,
I took my very old Philips FR 320 amp receiver from 3000 Km away, just to find it doesn´t work.
When powered on the lights turn on, the tuner screen readings change and so.
But there is no sound coming out from the speakers, nor from the headphones when plugged.
There´s plenty of capacitors that are maybe dead, plus they are not easily accessible. Since I took the effort to move with me I thought I would at least ask if anyone has any advice to revive the amp.
Any suggestions/hope for this device?
Thanks in advance.
Schema
I took my very old Philips FR 320 amp receiver from 3000 Km away, just to find it doesn´t work.
When powered on the lights turn on, the tuner screen readings change and so.
But there is no sound coming out from the speakers, nor from the headphones when plugged.
There´s plenty of capacitors that are maybe dead, plus they are not easily accessible. Since I took the effort to move with me I thought I would at least ask if anyone has any advice to revive the amp.
Any suggestions/hope for this device?
Thanks in advance.
Schema
Those batteries look a bit the worse for wear...
Its cut off in the picture but I'm wondering if there should be shorting links fitted to what looks like Equalizer out and Equalizer in. Try connecting a phono lead (RCA lead) from Left out to Left in and same for the right.
Its cut off in the picture but I'm wondering if there should be shorting links fitted to what looks like Equalizer out and Equalizer in. Try connecting a phono lead (RCA lead) from Left out to Left in and same for the right.
Thank you Mooly!
Yeah the batteries are completely lost.
Here´s a better picture of the back connections.
I did try connecting the phone to my turntable. In fact, that was the main reason to take this with me. But there is no sound when selecting the phono or when selecting the integrated tuner that the amp has. I didn´t take the equalizer with me.
BUT I just connected the equalizer IN to the equalizer OUT as you suggested, and actually I got sound through the headphones (!!).
Unfortunately there is still no sound from the speakers yet (headphones unplugged of course)
The spakers I´m connecting to have 4.00 ohm impedance. Could that be a reason for not getting any sound?
LENCO LS-500OK
I attached the schema in PDF here by the way.
Yeah the batteries are completely lost.
Here´s a better picture of the back connections.
I did try connecting the phone to my turntable. In fact, that was the main reason to take this with me. But there is no sound when selecting the phono or when selecting the integrated tuner that the amp has. I didn´t take the equalizer with me.
BUT I just connected the equalizer IN to the equalizer OUT as you suggested, and actually I got sound through the headphones (!!).
Unfortunately there is still no sound from the speakers yet (headphones unplugged of course)
The spakers I´m connecting to have 4.00 ohm impedance. Could that be a reason for not getting any sound?
LENCO LS-500OK
I attached the schema in PDF here by the way.
Thanks Galu. Yeah, that´s true. I don´t have the links though.
Like I mentioned in my last message shorting the equalizer resulted in sound through the headphone. But not from the speakers yet.
I see there are terminals for 'front' and 'rear' speakers.
Which terminals are you using?
Which terminals are you using?
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When using only one pair of speakers, you should be using the outermost red and black terminals of the R and L channels (as indicated by the single loudspeaker symbol at the very top and very bottom, above and below the terminal panel).
The speakers look as though they need to connect to the outermost terminals. I think using front and rear just wires them in series i.e. the centre terminals are just a link/connection point.
Use the outer connections.
Use the outer connections.
Aaarg. Of course! it is clearly indicated, when you pay attention...
While waiting I did some searches and found out this
It is not the exact same model but that states: 2 x 30 W linear power amplifier, with 8 ohm load and 20 Hz-40 kHz frequency response.
The speakers I have are 4 ohm. So I guess I should not be testing with those.
I just tried with a guitar cabinet I have that is 8 ohm, just to try. And I got sound out of the speakers!!
So THANK YOU MOOLY AND GALU!!
I guess I should now find some 8 ohm speakers.
Cheers!
While waiting I did some searches and found out this
It is not the exact same model but that states: 2 x 30 W linear power amplifier, with 8 ohm load and 20 Hz-40 kHz frequency response.
The speakers I have are 4 ohm. So I guess I should not be testing with those.
I just tried with a guitar cabinet I have that is 8 ohm, just to try. And I got sound out of the speakers!!
So THANK YOU MOOLY AND GALU!!
I guess I should now find some 8 ohm speakers.
Cheers!
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That link jumps around!
The Philips FR320 is rated 30W into 8 ohm. It may not like a 4 ohm load. Best keep the volume down.
What do you think Mooly? 🙂
Attachments
The supplied speakers are not necessarily 4 ohm though - can you check their DC resistance with an ohmmeter?
Not sure where you got that from.
Service manual uploaded here is chopped/incomplete , is missing all the specs and disassembly sheets, most of the schematics, and jumps straight to page 12: power amp schematic.
The service manual shows a beast of an amp, Class H, quad rail, highest rails +/-48V , mid rails +/-29V, easily 120W RMS into 4 ohm.
Confirmed by power transistor choice: BDT82/83 are TO220 BUT 15A 125W rated , sort of overkill using 4 devices per channel for a 30W amp
Lenco speakers are rated 30W RMS.
Possibility 1: OP BLEW them.
Headphones (haven´t found them yet, just looked at schematic for 5 minutes) may have an independent chipamp, fed from an extra power supply so they work.
Possibility 2: OP blew power amp DC fuses, there´s 4 of them, one for each rail.
Here, fuses 1260/61/62/63
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Edit time passed, so:
Nope, these old eyes can´t find headphone out or any dedicated chipamp, but I expect they are somewhere.
There is also a protection circuit triggering a relay which cuts off the speaker out line if there is any problem, Power amp might be damaged and protection is just doing its job.
Sadly this level of damage requires a trained Tech, is well beyond an average user possibilities.
HOPE problem is blown speakers, because they can be replaced.
As a side note, when I read "very old receiver" I expected a wooden case, germanium transistors unit or maybe early silicon, go figure.
Oh well.
Nope, these old eyes can´t find headphone out or any dedicated chipamp, but I expect they are somewhere.
There is also a protection circuit triggering a relay which cuts off the speaker out line if there is any problem, Power amp might be damaged and protection is just doing its job.
Sadly this level of damage requires a trained Tech, is well beyond an average user possibilities.
HOPE problem is blown speakers, because they can be replaced.
As a side note, when I read "very old receiver" I expected a wooden case, germanium transistors unit or maybe early silicon, go figure.
Oh well.
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Thanks JMFahey.
I believe all is ok. I wasn´t connecting the speaker wires correctly, that might have save them.
After jumping the IN and OUT of the equalizer I got sound from the headphones. And after connecting the wires correctly (the outer connections) I got sound using a 8 ohm speaker.
Now I should find a proper pair of speakers. I don´t wanna get any super big anyway.
Cheers.
