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Old 1st September 2007, 05:11 AM   #1
evo9 is offline evo9  United States
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Default Help Identifying Diode

Hello guy's, I need help Identifying the make of this diode. I am also having a hard time finding the C67 number on it. Any leads or cross reference would be of great help.
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Old 1st September 2007, 05:31 AM   #2
OzMikeH is offline OzMikeH  Australia
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What equipment is it in?
What part of the circuit is it?
what value is the resistor in series?
can you sketch the surrounding circuit at least out to the next active devices?
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Old 1st September 2007, 06:14 AM   #3
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Try These links

http://www.marsport.org.uk/smd/mainframe.htm
http://www.elektronik-kompendium.de/service/smdcode.php
http://www.tkb-4u.com/code/smdcode/indexsmdcode.php

Also check for the logo of manufacturer

http://www.chipdocs.com/logos/logotypes.html

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Old 1st September 2007, 09:00 AM   #4
evo9 is offline evo9  United States
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It is one of the amplifier board from the creative labs gigaworks S750 speaker system! The color band on the resistors are red, black, red, gold. I was sent the board to source the defective parts. I am not able to answer the very technical questions. I did try to get info on the parts from creative labs. But, they would not release any technical info on their products. They were more willing to sell me a new speaker system.
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Old 1st September 2007, 11:07 AM   #5
OzMikeH is offline OzMikeH  Australia
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You need to understand the circuit around a component if you are measuring it in circuit. The solder tooks untouched so I assume you have measured it in circuit, it may not be faulty at all.

The resistor is a 5% 2k ohm resistor and appears large enough to be a hefty wattage. To get enough current to get a 2k resistor hot you need lots of volts so I think what you have there might be a switched mode power supply or a very powerful amplifier.

If you can figure enough of the circuit to work out what it needs to do you might be able to stick any old diode of X voltage and Y current rating in it's place.

You'll be lucky to positively identify a part with so few numbers on it. Often SMT parts have no markings whatsoever, all of the ID is on the bulk reel they come on. Being a semiconductor that may only be a date code.
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Old 1st September 2007, 07:02 PM   #6
evo9 is offline evo9  United States
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Correction on the resistor color band..... It is brown, black, brown, gold! OzMike, I have not measured the value of the diodes. I was sent the good board. With instruction to only remove them IF, the part can't be found.
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Old 10th September 2007, 10:20 AM   #7
ashwick is offline ashwick  India
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While on the topic,can any of the members identify the following diode and suggest an equivalent?
Diode marking(as per the service manual)2E
Equipment: Sansui AU-X55(Vintage)
Location:Power:Amp board
Thanks in advance
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Old 10th September 2007, 10:36 AM   #8
OzMikeH is offline OzMikeH  Australia
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Most likely the amplifier is not a mono-block. Look at the other channel. You may need to desolder one end to see all of the markings. Depending what it is in the circuit a 1n4007 or a 1n4148 should work in most cases depending on exactly what the diode is being used for. measure the volt drop across it with a meter while you have one end lifted, this can tell you if it's a Schottky or a normal diode.
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Old 12th September 2007, 06:43 AM   #9
ashwick is offline ashwick  India
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To
OzMikeH.
Thanks. I will try to do as advised
Here is a picture of the part of the schematic
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Old 12th September 2007, 06:46 AM   #10
ashwick is offline ashwick  India
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The picture again!
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