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Orion HCCA 225 Digital Reference with Low Output
Orion HCCA 225 Digital Reference with Low Output
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Old 2nd February 2011, 03:40 PM   #1
0ldSch00lf00l is offline 0ldSch00lf00l  United States
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Default Orion HCCA 225 Digital Reference with Low Output

I picked up a barely working Orion HCCA 225 Digital Reference on a trade and it has extremely low output.

Thus far I've checked the SMP60N06-18s in the Power supply section as well as the 2n6491s and the 2n6488s and nothing appears to be shorted or open. Rail voltage is where I think it should be at 22.5 volts.

I guess I am off to troubleshoot the audio section next but I did have a couple of questions. What are the chances that there are bad capacitors blocking the audio signal from passing through the amp? Also, if I decide to replace the SMP60N06-18s, would the IRF3205 be a viable substitute?
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Old 2nd February 2011, 06:22 PM   #2
Perry Babin is offline Perry Babin  United States
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Remove the two muting transistors (2N5639 near the audio op-amps). Does that help?
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Old 4th February 2011, 03:31 AM   #3
0ldSch00lf00l is offline 0ldSch00lf00l  United States
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Removing the muting transistors worked like a charm.

What do I need to do to solve the problem?
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Old 4th February 2011, 03:34 AM   #4
Perry Babin is offline Perry Babin  United States
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What is the DC voltage on the third pad for the muting transistors?
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Old 4th February 2011, 03:57 AM   #5
0ldSch00lf00l is offline 0ldSch00lf00l  United States
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-10.83 and -10.89

Also, by third, I am assuming you mean the squares since these are reversed as mentioned in your repair tutorial.

Edit: After testing the JFETS that I pulled, it appears that they are both shot.

Last edited by 0ldSch00lf00l; 4th February 2011 at 04:19 AM.
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Old 4th February 2011, 04:23 AM   #6
Perry Babin is offline Perry Babin  United States
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It appears that the FETs are defective. -11 volts should have them switched completely off (allowing audio to pass). On a gen 2 225 I have here, the muting is essentially completely defeated at -3v.
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Old 4th February 2011, 04:24 AM   #7
0ldSch00lf00l is offline 0ldSch00lf00l  United States
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Thank you for the help kind sir!
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Old 4th February 2011, 04:32 AM   #8
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
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If you order replacements, order extras.

A side note, it's good to see that you took time to find that orion page and read it.
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