700b!!!

CASSETTE DECK

CASSETTE DECK

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#110
laatsch55 said:
The PL folks didn't figure it out.....Check the WOPL arhives CJ. Joe wrote a very good description of the whole phenomenon...
Click to expand...
I have read the description a few times, but I have not been able to find a clear schematic on line, in which most component numbers and values can be read, however almost all components and the circuit could be clearly identified in the schematics available on line.

Can anyone find a clear schematic?

Reading the description makes a lot more sense if component numbers and values can be read.
 
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laatsch55

laatsch55

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#111
I can e-mail you a WO schematic, but I ask you don't publish it or send it on. It is copyrighted, but don't wanna make it easy on folks.
 
laatsch55

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Wouldn't do you any good the WO's don't latch up. I'll post up a standard PL 14 a schematic. They were the worst offenders...
 
CASSETTE DECK

CASSETTE DECK

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#116
laatsch55 said:
Got this one cleaned up quite a bit...
Click to expand...
Thanks for posting.

Unfortunately most of the component numbers and values can't be read because they are out of focus.

It's not all that important. I was just curious about the latch-up phenomenon, one that I had never heard of before I came to Phoenix.
 
laatsch55

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CJ, when I scanned it and put it to file I can pull it up and magnify it and it comes through beautifully. If you'll Pm your e-mail I'll send it on.

The latch up wasn't a secret but I don't think too many guys figured it out. It does mention it in the service manual, but their solution was wholesale replacement of the class A stage. Had a 400 do this to me and it drove me crazy till Joe and Don explained it to me....

And the frustrating part was it's inconsistency, like sometimes only the first time after changing out board caps...
 
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CASSETTE DECK

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#118
laatsch55 said:
CJ, when I scanned it and put it to file I can pull it up and magnify it and it comes through beautifully. If you'll Pm your e-mail I'll send it on.

The latch up wasn't a secret but I don't think too many guys figured it out. It does mention it in the service manual, but their solution was wholesale replacement of the class A stage. Had a 400 do this to me and it drove me crazy till Joe and Don explained it to me....

And the frustrating part was it's inconsistency, like sometimes only the first time after changing out board caps...
Click to expand...
Sounds like an intermittent problem caused by a marginal design fault.

PM on it's way now.
 
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