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Orion HCCA 2100 no rail voltage.
Orion HCCA 2100 no rail voltage.
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Old 11th April 2019, 05:38 AM   #181
Chopperbuilder is offline Chopperbuilder  United States
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Yes.
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Old 11th April 2019, 06:04 AM   #182
Perry Babin is offline Perry Babin  United States
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Is there voltage on the RCA shield?

All of this and everything I will ask has already been done. Read back through the thread and go through each step.
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Old 12th April 2019, 01:41 AM   #183
Chopperbuilder is offline Chopperbuilder  United States
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There is 0v on the RCA shield.


I figured as much and ran through it before hand. What I've found is when the amp is powered up the voltage on pin 4 of the 494 does not drop below +0.310v DC and the DC voltage on leg three of the muting transistors is not dropping to anywhere near what it should be.


When amp power shuts down the DC voltage on pin 4 of the 494 is +3.50v and pins 9 and 10 drop to 0.000v.
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Old 12th April 2019, 06:03 AM   #184
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Should the two A06's circled in the photo have rail voltage on their collectors?
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File Type: jpg 20190412_005803-1.jpg (711.3 KB, 36 views)
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Old 12th April 2019, 07:54 AM   #185
Perry Babin is offline Perry Babin  United States
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Someone else may know but I have only the information you've posted for this specific amp. If you can tell me what they're connected to, I may be able to give you an educated guess.
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Old 13th April 2019, 05:32 AM   #186
Chopperbuilder is offline Chopperbuilder  United States
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I did my best to draw out the DC current flow to the third leg of the A06 on one side of the board in the attached photo. Voltage starts with the red wire.


The resistor with the red arrow pointing to it does not have 0.000v across it. The DC voltage across it is +0.003v.
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Old 13th April 2019, 09:40 AM   #187
Perry Babin is offline Perry Babin  United States
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Are you sure that the transistor near the red wire is an A06?

Are you sure that the emitter connects to the red wire?
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Old 13th April 2019, 05:17 PM   #188
Chopperbuilder is offline Chopperbuilder  United States
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No, the transistor near the red wire is an A56. The transistor near the resistor with the red arrow is an A06.

Yes, the emitter leg of that A56 is connected to the trace that red wire feeds.
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Old 13th April 2019, 06:13 PM   #189
Perry Babin is offline Perry Babin  United States
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I don't think the two A06s near the 494? should have rail voltage. Do they?

There are likely some A06s with negative rail voltage on their emitters but they should be near the emitter resistors.
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Old 13th April 2019, 06:25 PM   #190
Chopperbuilder is offline Chopperbuilder  United States
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The two A06's I have circled in the photo in post #186 (one of which is near the 494) both have rail voltage on their collectors.
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