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Again needing help fixing Orion HCCA 225 Digital Reference
Again needing help fixing Orion HCCA 225 Digital Reference
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Old 8th June 2018, 06:07 PM   #21
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
Black meter probe on RCA shields or one of the non-bridging speaker wires for all.

The center legs or the tabs of the rectifiers will have rail voltage.

Pins 4 and 8 on the op-amps are regulated voltage. All should read the same so only post the voltage you read on any of the op-amps.
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Old 8th June 2018, 09:09 PM   #22
Chopperbuilder is offline Chopperbuilder  United States
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First, thank you for the guidance. Once I started testing, the positive and negative parts of the test became obviously clear.


Rail voltage is: +21.5v, -21.5v
op-amp regulated voltage is: +14.10v, -13.85v they all had the same reading.
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Old 8th June 2018, 11:52 PM   #23
Perry Babin is offline Perry Babin  United States
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What is the 12v supply voltage at the amp with the amp on?

Do you have a way to play a test tone (100Hz?) through the amp?
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Old 9th June 2018, 12:10 AM   #24
Chopperbuilder is offline Chopperbuilder  United States
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The supply voltage at the amp with amp on is: 12.13v
Yes, I do have a way to play a 100Hz test tone through the amp.
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Old 9th June 2018, 12:18 AM   #25
Perry Babin is offline Perry Babin  United States
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Can you get more DC input voltage? 13.5v?

If not...
Gain at max
Both muting transistors out
Drive a test tone at level that will produce about 10v at the speaker wires.
Confirm that both channels are relatively close.

Reinstall ONE muting transistor and after leg 3 goes the lowest, drive the same signal into the amp.
What is the difference in the two channels?
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Old 9th June 2018, 02:43 AM   #26
Chopperbuilder is offline Chopperbuilder  United States
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No, I have no way of getting more DC input voltage. A 12 volt power supply is all I have.

Both muting resistors out and driving a test tone as close to 10v at the speaker wires as I could get, yielded the following results:
Right channel - 12.85v
Left channel - 11.62v


Do you still want me to proceed with reinstalling one muting resistor and performing that test?
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Old 9th June 2018, 02:49 AM   #27
Perry Babin is offline Perry Babin  United States
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Yes. Those are for reference. I want to confirm that the muting circuit is partially engaged. That's the next test.
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Old 9th June 2018, 02:57 AM   #28
Chopperbuilder is offline Chopperbuilder  United States
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The transistors I have circled in the photo are all new. I replaced them back when you help me with repairing it the first time. Is that a possibility as to why we have almost a 1.25v difference between the two channels?
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File Type: jpg 20180608_101513-1.jpg (904.3 KB, 35 views)
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Old 9th June 2018, 03:01 AM   #29
Perry Babin is offline Perry Babin  United States
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That's less than 1dB. That's inaudible in most all situations, especially in a car.

Those transistors have nothing to do with the overall gain of the amplifier.
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Old 9th June 2018, 03:46 AM   #30
Chopperbuilder is offline Chopperbuilder  United States
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I reinstalled the muting transistor circled in the pic. After approximately 20 minutes the third leg voltage peeked at -13.5v.
The test results were as follows:
Right channel 12.83v
Left channel 11.63v
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File Type: jpg 20180517_192138-1-4.jpg (950.1 KB, 32 views)
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