Lexicon 480L HSP Board Repair?
- Thread starter mrclunk
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plimousse
Well-known member
Get the test cart ( available on Ebay ?), it will save you hours of guessing.
And follow the chapter 5.5 of service manual.
With the test cart, you get the result immdiatly.
Cheers,
And follow the chapter 5.5 of service manual.
With the test cart, you get the result immdiatly.
Cheers,
NoisyIndividual
Well-known member
I've never spent hours guessing, and I have replaced lots of faulty DRAM in my time.
A pair of ears, and a systematic logical approach finds the duff ones quite easily and quickly.
But then I'm old, and we didn't have DRAM testers in them there days.
Freezer spray can also help, as DRAM chips don't always totally fail on every memory location.
But I think you'll need an extender card to do that in a 480L.
A pair of ears, and a systematic logical approach finds the duff ones quite easily and quickly.
But then I'm old, and we didn't have DRAM testers in them there days.
Freezer spray can also help, as DRAM chips don't always totally fail on every memory location.
But I think you'll need an extender card to do that in a 480L.
If it would be my unit I would buy the test card. The owner desided not to do. Where can I fînd an extender card? I ordered some HY53C464LS-10 on ebay. If it doesn't help, we have at least some spares for the future.
And you couldn't imagine: he just sended me a text message today: My 960 broke ! I don't know if I take that challange. But first things first.
And you couldn't imagine: he just sended me a text message today: My 960 broke ! I don't know if I take that challange. But first things first.
I extracted HSP board 1 and left it alone for now. I removed Dram 64 to 68 on the other board and I plugged it back in. OVLD leds are out, noise is gone, got some reverb and some kind of multitap delay on the sound of a vinyl record that has come to his end. Very promissing if you ask me. I have to order some 18 pin sockets now. Thanks so far
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Unit is completely repaired. Thanks to Noisyindividual, Paolominarini, Philbo King for the great support. What I found out is that you only need the last 5 drams for the long reverbs. For chorus you only need the firt 5 drams. So if you have incorrect reverb the problem is in the last 5 drams.
Strange thing is that I had a problem with the last 5 drams, when the DRAMs switched places, the problem was gone? We will see after burn in.
Strange thing is that I had a problem with the last 5 drams, when the DRAMs switched places, the problem was gone? We will see after burn in.
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