LC1 schematics - real or fantasy?

11 replies
A(
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ablaumeise (archived)
Bronze
Posted November 9, 2011 at 11:21 GMT
#1761203

I know this has been discussed before, but all the threads somehow end with "I can't get this damn thing open anyway!".

Well, I was able to do exactly that. Had two broken LC1s, disassembled both, fixed one using parts from the other. Worked fine so far...but it's somewhat missing the real challenge. So now I want to try to revive the second one.

The repaired unit had a bunch of very high ESR caps, a dead triode and a shorted diode. Haven't really checked the other one yet, but there is already a first problem: The diode. It's a SMD-part and the only mark is a single blue band. Every other diode in there has a black band - so is suppose this isn't a ordinary diode, but maybe a Zener?

Is there anything like a schematic or even a service manual for the LC1?

M(
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MCB (archived)
Bronze
Posted November 10, 2011 at 09:34 GMT
#1761204

What is the component number D?

A(
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ablaumeise (archived)
Bronze
Posted November 10, 2011 at 10:13 GMT
#1761205

Can't really check that right now, I won't be home till next weekend...but: If I remember correctly, there are no component numbers for the SMD-components?

B(
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Blackrix (archived)
Bronze
Posted December 8, 2011 at 15:27 GMT
#1761206

Is the LC1 already repaired? If not, on which board are the defective components?

A(
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ablaumeise (archived)
Bronze
Posted December 8, 2011 at 15:37 GMT
#1761207

Nope. Verified my claim...there are no component numbers for the SMD-parts. Kind of in a dead end now.

The defective components I know of (couldn't find any others so far) are on the lowermost board - the one with the connectors and the fuse. I wanted to test the upper boards in the other LC1, unfortunately I forgot to do so...and by now the other LC1 has been sold on, since I had no use for it.

B(
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Blackrix (archived)
Bronze
Posted December 8, 2011 at 16:01 GMT
#1761208

There are 3 types of diode's on this board, the BAS32 (3x), a 6V2 zener and a 13V zener if I'm correct. 

S(
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Step1 (archived)
Bronze
Posted December 9, 2011 at 07:12 GMT
#1761209

Why not measure across the diode on the working module?

 

*edit - with power applied of course!

A(
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ablaumeise (archived)
Bronze
Posted December 9, 2011 at 08:31 GMT
#1761210

Well...I no longer have a working module, that's the whole problem here.

Got those two broken LC1s with a bunch of other stuff about a year ago. Fixed one and eventually sold it on, since I had absolutely no use for it.

 

Blackrix wrote:

There are 3 types of diode's on this board, the BAS32 (3x), a 6V2 zener and a 13V zener if I'm correct. 

So you have a schematic? 😕

 

B(
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Blackrix (archived)
Bronze
Posted December 9, 2011 at 14:50 GMT
#1761211

Well, I have a copy of a fax, so it is not too clear. The 13V zener I am not sure of since this is not very clear on the schematic.

M(
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MCB (archived)
Bronze
Posted December 10, 2011 at 13:05 GMT
#1761212

it´s a 15V zener

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