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Orion HCCA 2100 no rail voltage.
Orion HCCA 2100 no rail voltage.
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Old 5th April 2019, 06:06 AM   #151
Chopperbuilder is offline Chopperbuilder  United States
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I'm at a loss here with this piece of junk amp. Starting to think it would better to strip it down and use it for parts.
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Multimeter: Blue Point - Model: MT586B / Oscilloscope: Leader - Model: LBO-524 / Power Supply: Modified computer 500 watt

Last edited by Chopperbuilder; 5th April 2019 at 06:28 AM.
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Old 5th April 2019, 07:06 AM   #152
Perry Babin is offline Perry Babin  United States
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If all emitter resistors had approximately the same voltage, I'd look to see if the voltage across the 4 orange diodes near the 5534 was different from one channel to the other.
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Old 5th April 2019, 06:32 PM   #153
Chopperbuilder is offline Chopperbuilder  United States
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The DC voltage across the orange diodes near the 5534 on the right side are all between +0.605v and +0.614v.

See photo for the DC voltages across the left side diodes.
Attached Images
File Type: jpg 20190331_000912-5.jpg (923.4 KB, 37 views)
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Old 5th April 2019, 07:28 PM   #154
Chopperbuilder is offline Chopperbuilder  United States
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I still have all the output transistors on the left side out of circuit still, should I reinstall them?
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Old 6th April 2019, 12:42 AM   #155
Perry Babin is offline Perry Babin  United States
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The diodes should not read as high as they are, on the left side. Lift one lead and re-check them out of the circuit. Black probe on the striped end.
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Old 7th April 2019, 05:05 AM   #156
Chopperbuilder is offline Chopperbuilder  United States
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I'm not sure if I fully understand what you are wanting me to do. Are you wanting me to lift one of the leads on one the diodes and check the DC voltage across the remaining three?
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Old 7th April 2019, 05:18 AM   #157
Perry Babin is offline Perry Babin  United States
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The diodes are small and difficult for me to hold so I only desolder one lead to check them. Do this with no power applied. Check them on diode-check and resistance.
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Old 7th April 2019, 05:37 AM   #158
Chopperbuilder is offline Chopperbuilder  United States
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Had me wondering for a minute there.
They are all between +0.625v/+0.627v.
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Multimeter: Blue Point - Model: MT586B / Oscilloscope: Leader - Model: LBO-524 / Power Supply: Modified computer 500 watt

Last edited by Chopperbuilder; 7th April 2019 at 05:54 AM.
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Old 7th April 2019, 08:05 AM   #159
Perry Babin is offline Perry Babin  United States
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Were the probes oriented the same way as when you read more than 2v across some of them?
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Old 7th April 2019, 08:39 AM   #160
Chopperbuilder is offline Chopperbuilder  United States
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Not sure that I had the black probe on the striped end on all of them but at least two of them.
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