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Old 5th April 2006, 03:34 PM   #1
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Default Transistor a1023?

I have a Treo ssx1500.1 amp that has a burned transistor a1023, but i cant seem to find it anywhere.. Help me out guys

Thanks
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Old 5th April 2006, 03:39 PM   #2
anatech is offline anatech  Canada
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Hi shiipseki,
That's a 2SA1023. 70V, 100mA, 250mW, Hfe=200 ish. A 2SA970 would work well as a sub, the beta is a bit higher.

-Chris
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Old 5th April 2006, 04:07 PM   #3
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Thanks for the quick reply!
Where can I purchase the 2SA1023?
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Old 5th April 2006, 04:16 PM   #4
anatech is offline anatech  Canada
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Hi shiipseki,
A couple questions now spring to mind.

Do you have the schematic or know what this part does exactly (might be more problems)?

How much experience do you have at servicing amplifiers?

This is a common Japanese part. Mouser or Digikey may have it. Jan numbered parts do not have the same pin out (not even close to the same parts). If you buy ECG or NTE parts, then just run over it a few times. The result will be similar, but running over it is much more fun.

-Chris
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Old 5th April 2006, 05:27 PM   #5
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I do not have much experience at all...
I'm just trying to replace parts that seem to be burned...
Is this a good idea?
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Old 5th April 2006, 05:38 PM   #6
anatech is offline anatech  Canada
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Hi shiipseki,
Quote:
Is this a good idea?
Not generally. You could get lucky, or cause more damage. Proper servicing is a bit more involved than that.

If you have a friend who knows more, I'd enlist his help.

-Chris
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Old 5th April 2006, 07:38 PM   #7
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http://www.mcminone.com/search.asp?keyword=2sa1023

I've used the KEC brand with no problems.

In some of the class D amps, the 2sa1023 and 2sc1027 transistors are used as drivers in the audio section. When used there, the transistors (a1023 or c1027) may be connected directly in parallel with no resistors. This means that the transistors must match very closely to assure equal current sharing. If your amp has this type of circuit design, replace both parallel drivers at the same time.

Check the other drivers in the area as well as the transistors that they drive (output FETs or power supply FETs). If there are zener diodes in the driver section, check them. They are likely 12 volt zeners. If the amp appears to be working properly, measure the voltage across the zeners. Sometimes they short or leak (electrically) which reduces the drive voltage and will cause the outputs to run hot.

When powering the amp up after replacing the parts, use a current limiter in the power supply line or use a small fuse (~10 amps). Clamp the amp back into the heatsink before applying power to it.
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Old 7th April 2006, 12:03 AM   #8
anatech is offline anatech  Canada
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Hi Perry,
KEC ?

I've heard of KSA, KSC ..... Just Koren manufacture. If KEC is any type of replacement brand - avoid.

-Chris
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Old 7th April 2006, 12:45 AM   #9
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I would never knowingly recommend something like ECG or NTE. KEC is the manufacturer as far as I know. The top image is the original that I pulled from a JBL 1200.1. The second image is the KEC replacement from MCM. The third image is a transistor that I received from JBL. They look the same to me. The only difference is the date code and the dot which likely indicates that it's lead free.


http://www.bcae1.com/images/img192.jpg
http://www.bcae1.com/images/img191.jpg
http://www.bcae1.com/images/img193.jpg
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Old 7th April 2006, 12:47 AM   #10
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maybe i'll just send it out for repair you guys know any good places with decent price?

Thanks, I appreciate all the help
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