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Ecler PAM DOA (with pics!)

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soulray2 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote soulray2 Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2011 at 3:44pm
Update: Having replaced the switch, I seem to have tracked the problem down to this:-
 
 
I can trace power into the Soft-start, (if that's what it is?), board but not much leaving it into the torus/transformer.
 
After removing & cleaning the board then reconnecting, it did manage a flicker of a start-up; 1 of the red Protect LEDs came on briefly and and the fan started, but it faded away quickly, and nowt much more heard but a whirr & click from the Relay switches. At least I think that's what the 2 large black components are!
What should be my next step do you think folk?Confused
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Post Options Post Options   Thanks (0) Thanks(0)   Quote colint Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2011 at 5:58pm
The problem with my pam 960 was in the softstart/protect board before I sent it to Steve I did change the 2 relays and the amp worked until clipped then it shut down?

I found out about the relays by bypassing the speaker wires on the board, when bypassed the amp worked perfectly (but with no protection of course) so I reconnected it all and sent it off to Steve as my knowledge of electronics is limited and I didn't want to electrocute myself  Big smile
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2011 at 7:08pm
There isnt alot on there is there; check for cracked tracks and joints around the power resistors first (particularly if the seller of the amp told you it worked ok when he sent it..I'm thinking it's been brought on by a rough journey) and then check the components themselves starting with the resistors, capacitors then the diodes.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2011 at 7:10pm
PS if that's a thermal fuse strapped to the inrush resistors, check that as well.

PPS just checked the diagram it is



Edited by kedwardsleisure - 17 May 2011 at 7:13pm
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soulray2 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote soulray2 Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2011 at 2:47pm
Originally posted by kedwardsleisure kedwardsleisure wrote:

There isnt alot on there is there; check for cracked tracks and joints around the power resistors first (particularly if the seller of the amp told you it worked ok when he sent it..I'm thinking it's been brought on by a rough journey) and then check the components themselves starting with the resistors, capacitors then the diodes.

The seller insists it was working fine before he sent it, and he was quick to offer a refund saying he would take it up with his courier, but it wasn't at all well packed, so I can easily believed it did indeed have a "rough journey", as you say!
 
I can't "see" any cracks and the plastic board seems all intact, but truth be told, it would have to be pretty obvious for me to spot the problem(s).
 
Question: Kedwardsleisure, do you do a postal service? I'm stubbornly determined to get this old girl working again, and since I've already gotten this board out, what say you I post this to you for your expert & professional appraisal? (When all else fails, try flattery!)Approve
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Post Options Post Options   Thanks (0) Thanks(0)   Quote service dept Steve Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2011 at 2:58pm
You might like to just post the circuit board to one of us for checking, there are a good few service guys on this forum, save a lot on post. I would be happy to look at it if kedwardsleisure doesn't fancy it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote soulray2 Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2011 at 3:23pm
And I'd be happy to do so Steve. Thanks for your offer. Like you suggest, we'll give Kedwardsleisure 1st refusal, because I asked him first.
Just to confirm, you do mean the Soft-start circuit board that I already took out to photograph?
 
If nothing else, I'm learning the basic layout/structure of these old school amps is fairly clear & logical. They're a good place to learn the basics, how the various elements of a power amp work, or should work together. Doesn't mean I can fix it, but at least I've got a better idea of the "alchemy & voodoo" that goes on inside the case!LOL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote service dept Steve Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2011 at 3:32pm
Voodoo is about right with a Spanish amplifier!
If I were you I would just sent the soft start board with switch as photographed, once that checks out (or otherwise) then you may need to send someone the whole amp, but at least if you have a known good soft start board, at the moment that is the number one suspect and the post will only be a couple of quid, so that is potentially 30 quid or more saved on postage if the fault is at that board.
Did you make careful note of all the connections to the transformer etc?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote soulray2 Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2011 at 3:54pm
Took a photo Steve before unplugging it, but it also has the colour code written under each tab connector, for each voltage: 110v thru' 240v. Quite a thoughtful touch really!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote service dept Steve Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2011 at 5:24pm
Before you post it off, If you have a meter you might want to check the thermal trip, see the 3 green resistors have some white gear on them? In that white stuff is a small component that shuts the amp down if those 3 resistors get too hot. It should look like a silver tube. trace the wires back to the circuit board for measuring, If you have a meter set to ohms range it should show a low value.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2011 at 7:30pm
By all means send the board off!

If it goes in a jiffy bag, pack it in a way that can withstand a foot.

I've had a few jiffy bags with boot prints on them!

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Post Options Post Options   Thanks (0) Thanks(0)   Quote soulray2 Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2011 at 9:34pm
I've packed the board inside a box and in a Jiffy bag that could withstand my dainty 15 stone frame, so it should reach you intact!
Posted 1st class today, so should be with you Monday good sir, for you to do your magic!Wink
 
Even if I can spot the faults, I have, I must concede, soldering skill worthy a welder on a Clyde shipyard!
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