orion HCCA-D1200, protect mode - diyAudio
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Old 18th April 2011, 03:23 AM   #1
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Default orion HCCA-D1200, protect mode

I have an orion HCCA-D1200 in my posession, I took it apart due to the amp going into protection mode. I noticed on of the FET's had a leg broken and possibly burned. The part number is FQA34N20 on the broken one. The others on the oposite side are IRFP064N's.I may have possibly damaged that one removing it from the thermal paste so it may not be the issue that killed the amp.

anybody got some tips on issues with this amp, I fix PC motherboards and chip OBD-1 Honda ecu's. I'm just doing this for a friend so any help is greatly appreciated

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Old 18th April 2011, 03:49 AM   #2
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Parts are very hard to get for one, replace all the fets I had to get them on ebay, and I could only get the irf po6 make sure you check the board next to the big caps on the right side for damaged parts as well if someone knows where i can get the fqa's please let me know
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Old 18th April 2011, 04:32 AM   #3
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i just checked the 100kiloohm resistors on r172, r181, r164, & r162 near the burned FQA34N20 and they are nowhere near the correct value checked on the board with a multimeter and they are all over the place. The 39 ohm resistors below them read fine.

Is there something I can substitute the FQA34N20's with thats reliable and readily available online.
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Old 18th April 2011, 05:13 AM   #4
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looks like the STW34NB20 is a direct replacement
STMICROELECTRONICS|STW34NB20|N CHANNEL MOSFET, 200V, 34A, TO | Newark.com

should I replace just those and the 100k ohm resistors?
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Old 18th April 2011, 07:00 AM   #5
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Is the 34N20 shorted?

If not, for testing, solder the leg back to the board.

Why do you think the 064 was damaged?

Ebay parts are often counterfeit or substandard. Just because they work in some applications, doesn't mean they'll work in all applications. Class D amps are notoriously sensitive to changes in output transistors. Unless absolutely necessary, don't use any substitute.
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Old 18th April 2011, 04:26 PM   #6
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the 34N20 was bad the leg broke off not on the side connecting to the board but the side connecting to the inside of the FET The fairchild FQA34N20 transistors are impossible to find and ST lists these as a direct cross reference I ordered the ST's from newark. I'll see if it works
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Old 20th April 2011, 01:58 PM   #7
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The ones I got off of ebay were a direct replacement, the guy I got them from had them in old stock in the us, but I paid 10.00 bucks a piece
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Old 23rd April 2011, 04:31 PM   #8
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replaced the fets and inspected the resistors off the board. No audio still
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