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Old 3rd April 2013, 04:36 AM   #1
john65b is offline john65b  United States
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Default Carver M1.5t Output Devices...

Hey all, I have a Carver M1.5T that blows fuses, and appears to have two output devices (Q1, Q2) on same board with shorts...

Weird thing is I downloaded the schematic and it says Q1,Q2, Q4, is MJ15023 and Q6, Q7, Q9 are MJ15024.

Board is 20032-3

But mine is Q1, Q2, Q4 is Motorola C10000, and Q6, Q7, Q9 is Motorola C11000...

Any ideas? Can I just replace the two bad Q1/ Q2 with MJ15023 and be OK, or should I stay with Motorola C10000? Saw one guy on ebay with C10000, but can't seem to find any info on them at all... any advice??
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Old 3rd April 2013, 04:49 AM   #2
Enzo is offline Enzo  United States
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Are you sure those are not just Carver part numbers on the transistors? C as in Carver makes me think so. I have never seen Moto C10000 or 11000 as a part. A lot of companies buy their parts marked with house numbers instead of genertic type numbers.

If it were mine, I'd be sticking the MJ types in there.
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Old 3rd April 2013, 11:50 AM   #3
djk is offline djk
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Use the MJ15024/25 pair if available.

Early M400s used the MJ15015/16 and frequently puked, replace with the MJ15024/25.
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Last edited by djk; 3rd April 2013 at 11:54 AM.
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Old 3rd April 2013, 12:34 PM   #4
john65b is offline john65b  United States
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Quote:
Are you sure those are not just Carver part numbers on the transistors?
OK, now I feel like a dope. Why did I not think of that?

The schematic from the service manual is very hard to read - is it MJ15023/24 or MJ15024/25?
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Old 3rd April 2013, 01:09 PM   #5
djk is offline djk
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The 22/24 are the same die, the 24s are test selected for the higher breakdown voltage specification.

Same story for the 23/25.
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Old 3rd April 2013, 01:37 PM   #6
john65b is offline john65b  United States
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Is Q1 and Q2 a MJ15023, MJ15024, or a MJ15025?? And does anyone have. Pair to sell/trade???
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Old 3rd April 2013, 09:19 PM   #7
djk is offline djk
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22/24 are NPN, 23/25 are PNP.

NPN go on positive rails, PNP on negative rails.
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Old 5th April 2013, 12:40 PM   #8
john65b is offline john65b  United States
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Whoops, I needed Q9 and Q10...either way I have ordered them and they are on their way.
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