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Orion HCCA 2100 no rail voltage.
Orion HCCA 2100 no rail voltage.
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Old 4th April 2019, 08:59 PM   #131
Perry Babin is offline Perry Babin  United States
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See attached.
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Old 4th April 2019, 09:01 PM   #132
Chopperbuilder is offline Chopperbuilder  United States
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Oh the 6491, okay. I'll pull it and check it. It is brand new.
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Old 4th April 2019, 09:22 PM   #133
Chopperbuilder is offline Chopperbuilder  United States
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It was bad. Replaced it. Voltage reading across all the emitter resistors is now 0.000v. Amp power light now lights up and the lamp bulb is not lighting up.
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Old 4th April 2019, 09:29 PM   #134
Perry Babin is offline Perry Babin  United States
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Did you buy them from a reputable distributor?
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Old 4th April 2019, 09:33 PM   #135
Chopperbuilder is offline Chopperbuilder  United States
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Yes, or at least what I thought was a reputable distributor. I bought them from Arrow.
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Old 4th April 2019, 09:38 PM   #136
Perry Babin is offline Perry Babin  United States
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Arrow is OK.

You need to determine why this didn't show up back in post 78. Why you read 0.000v across the emitter resistors. It would have saved a lot of time if it would have been caught back then.
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Old 4th April 2019, 09:47 PM   #137
Chopperbuilder is offline Chopperbuilder  United States
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Yes, it would have saved a lot of time. Sorry, I didn't catch it back then because I misunderstood and thought you were taking about the resistors on the PS FET's.
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Old 4th April 2019, 10:14 PM   #138
Chopperbuilder is offline Chopperbuilder  United States
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I put the amp pack to it's normal state (removed the lamp and soldered the red wire that feeds the audio circuit back into the board).

Took the limiter off and powered up the amp. Nothing appears to be heating up and it is producing clean audio however it is not producing full audio output.
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Old 4th April 2019, 10:17 PM   #139
Perry Babin is offline Perry Babin  United States
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Are you saying that it's producing audio but the output never reaches full rail voltage (clips)?

What is the DC voltage on leg 3 of the muting transistors?
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Old 4th April 2019, 10:26 PM   #140
Chopperbuilder is offline Chopperbuilder  United States
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Yes.


Both 2N5639 DC voltage:
1. -0.095v
2. -0.095v
3. -0.348v
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