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Help fixing Orion HCCA 225 Digital Reference
Help fixing Orion HCCA 225 Digital Reference
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Old 18th May 2018, 12:45 AM   #1
Chopperbuilder is offline Chopperbuilder  United States
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Default Help fixing Orion HCCA 225 Digital Reference

I have an old Orion HCCA 225 I bought new back in the 90's. The amp stopped working about two years after I bought it. Been sitting in my basement ever since. Decided to try to fix it recently. Hooked it up and it powers up but barely put any sound out. It then burned up one of the resistors. Replaced the resistor but it burns up the new resistor. At that point I replaced all the transistors on that circuit but it still burns up the resistor. Looking for ideas of what might be causing the problem. Greatly appropriate any help!


I attached some pics of it showing the resistor.
Attached Images
File Type: jpg 20180517_192138-1.jpg (948.0 KB, 39 views)
File Type: jpg 20180517_190820-1.jpg (909.9 KB, 34 views)
File Type: jpg 20180517_190917-1.jpg (917.7 KB, 41 views)
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Old 18th May 2018, 01:00 AM   #2
Perry Babin is offline Perry Babin  United States
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Is that resistor part of the protection circuit? If so, check the TO-92 case transistors in that area. Are all of the emitter resistors in that area within tolerance?
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Old 18th May 2018, 01:24 AM   #3
Chopperbuilder is offline Chopperbuilder  United States
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I'm not sure if it is part of the protection circuit or not. I attached some more pics to show more of the circuitry that it powers.
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File Type: jpg 20180517_201912-1.jpg (915.3 KB, 38 views)
File Type: jpg 20180517_201528-1.jpg (840.2 KB, 39 views)
File Type: jpg 20180517_201245-1.jpg (833.6 KB, 19 views)

Last edited by Chopperbuilder; 18th May 2018 at 01:38 AM. Reason: pics
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Old 18th May 2018, 01:53 AM   #4
tsmith1315 is offline tsmith1315  United States
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With that hot spot on the bottom of the board, I'd be highly suspicious of those electrolytics.
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Old 18th May 2018, 02:11 AM   #5
Chopperbuilder is offline Chopperbuilder  United States
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The thing that puzzles me about that hot spot is there is nothing on the other side of the board directly above it.The electrolytics are close but not directly above it. If you look at that pic the you can see where the electrolytics sit slightly more towards the top of the pic..Do you think they still could have caused it?
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Old 18th May 2018, 03:30 AM   #6
tsmith1315 is offline tsmith1315  United States
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I didn't look close enough. That spot is in between the caps and that last emitter resistor for the right channel.

Take Perry's advice, he's golden.

BTW- personally, I wouldn't power that amp up without having those transistors pressed very firmly against the heatsink, all screws in place.
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Old 18th May 2018, 06:17 AM   #7
Perry Babin is offline Perry Babin  United States
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Pull and check the transistor with the yellow arrow.

If you scrape the burned spot, how deeply is it burned?
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File Type: png orion22501b.png (831.8 KB, 15 views)
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Old 18th May 2018, 07:24 AM   #8
Chopperbuilder is offline Chopperbuilder  United States
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I was able to rub a lot of it off with a rag and a little alcohol. Scratched into it a little too. As I was saying, I'm questioning if it is a burn mark. Looks to me like ink that had gotten smudged... possibly a number...???
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File Type: jpg 20180518_021345-1.jpg (818.1 KB, 13 views)
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Old 18th May 2018, 07:25 AM   #9
Chopperbuilder is offline Chopperbuilder  United States
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Thanks Perry. I'll pull and check that transistor tomorrow.
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Old 18th May 2018, 09:30 PM   #10
Chopperbuilder is offline Chopperbuilder  United States
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I got to looking at the CAP's this morning and realized they where bulging some. I replaced all of them. While I was at it, I also replaced the transistor and it's mate that Perry suggested checking. There is now once again life in the old dog!!! It's working great! Thank you Perry and Tim for your help.
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