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Old 18th February 2013, 03:20 AM   #1
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Default SMD HELP

Hello..I am repairing a Memphis 16-MCA3004 amplifier..I have found two smd's that are defective,but can't cross-reference their markings. One is marked 3B horizontal with J vertical,and the other is marked C3 horizontal ,with 2C vertical.Any help will be greatly appreciated
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Old 18th February 2013, 03:34 AM   #2
kds9591 is offline kds9591  United States
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Default SMD CodeBook

Here's one link to a SMD CodeBook. There are others on the web if you do a search.

The SMD Code Book
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Old 18th February 2013, 06:47 AM   #3
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What is the circuit board designation for these?
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Old 18th February 2013, 04:31 PM   #4
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Perry..they are the power fet driver transistors...on the vertical board Q708,and Q709
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Old 18th February 2013, 08:39 PM   #5
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Are you sure that both have a Q prefix?

The C3 is likely a diode and would have a D prefix.

http://www.datasheetcatalog.org/data...kec/KDS122.pdf
http://datasheet.octopart.com/BC856B...et-7834531.pdf
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Old 18th February 2013, 10:01 PM   #6
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Correct Perry c3 does have a d prefix....
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Old 18th February 2013, 10:04 PM   #7
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Thanks Perry,for the help..I also found this very helpful site.
Marking smd
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Old 18th February 2013, 10:17 PM   #8
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The diodes likely survived. I'd use MMBTA56s as replacements for the transistors.
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Old 19th February 2013, 04:03 AM   #9
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Actually..the diodes are functioning properly...the transistors are what failed...
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