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Orion HCCA 2100 no rail voltage.
Orion HCCA 2100 no rail voltage.
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Old 15th April 2019, 06:24 AM   #201
Chopperbuilder is offline Chopperbuilder  United States
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Yes, it is pulling the supply down to 9.5v. Yes, I am going through the limiter.

I have installed all the parts in the audio section. Amp is out of the sink but fully together with the resistor installed between pins 4 and 9 of the 494.
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Old 15th April 2019, 06:32 AM   #202
Perry Babin is offline Perry Babin  United States
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Are the output transistors on the problem side heating up?
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Old 15th April 2019, 06:33 AM   #203
Chopperbuilder is offline Chopperbuilder  United States
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No. The only components heating up are the two voltage regulators on the right side of the board, the same two that have been heating up.
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Old 15th April 2019, 06:37 AM   #204
Perry Babin is offline Perry Babin  United States
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Do you have more than 0.000v across the emitter resistors?
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Old 15th April 2019, 06:41 AM   #205
Chopperbuilder is offline Chopperbuilder  United States
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No. The voltage across the emitter resistors is 0.000v.
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Old 15th April 2019, 03:53 PM   #206
Perry Babin is offline Perry Babin  United States
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Are you checking all of the things we covered before, like, do you have the same rail voltage on both channels...
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Old 15th April 2019, 07:31 PM   #207
Chopperbuilder is offline Chopperbuilder  United States
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I did check the things we covered before. Rail voltage is the same on both channels (+/-34.195v).

Other than pin 4 of the 494 having high voltage (without the resistor installed), the muting transistors not dropping to where they should be and the odd voltage (rail voltage) on the two A06's I haven't found anything else that seems to be out of specs.
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Multimeter: Blue Point - Model: MT586B / Oscilloscope: Leader - Model: LBO-524 / Power Supply: Modified computer 500 watt
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Old 15th April 2019, 07:53 PM   #208
Perry Babin is offline Perry Babin  United States
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I think this thing needs a priest, not a technician. What does an exorcism go for nowadays?

Pull the two heating regulators. Does it still pull excessive current?
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Old 15th April 2019, 08:10 PM   #209
Chopperbuilder is offline Chopperbuilder  United States
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I'm not sure an exorcism costs now days but I'm about ready to start looking into it!


I pulled the two regulators and the DC voltage on the power terminal went up to +10.25v.
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Old 15th April 2019, 08:12 PM   #210
Perry Babin is offline Perry Babin  United States
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What was the voltage before when you thought that everything was OK?
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