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Orion 250 HCCA no rail voltage
Orion 250 HCCA no rail voltage
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Old 11th March 2010, 07:01 PM   #1
ECM is offline ECM  United States
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Join Date: Jul 2004
Location: Dubai
Default Orion 250 HCCA no rail voltage

Working on a second generation (Digital Reference) and it will not produce rail voltage.

The amp turns on, doesn't draw excessive current, outputs measure fine in circuit.

The first set of rectifiers after the two rows of PS fets read about +/-22volts.

The main voltage rails going to the outputs do not come up.

Will the protection circuit prevent the rails from coming up?

Thanks,
ECM
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Old 11th March 2010, 07:48 PM   #2
Perry Babin is offline Perry Babin  United States
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Did you check for rail voltage on the emitter of the output transistors?

Are you sure you read -22v on one of those rectifiers?
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Old 12th March 2010, 07:14 AM   #3
ECM is offline ECM  United States
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Location: Dubai
Yes, I checked for rail voltage on the output transistors and all read zero.

I'll double check the rectifier voltage again.

If the main rectifiers on the bottom of the board fail by going open, will that prevent the rail voltage from showing up? The red light on the other end of the board was lit as well.

I'll have a look at it again today and take more measurements.
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Old 12th March 2010, 07:43 AM   #4
Perry Babin is offline Perry Babin  United States
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Place the black probe on the RCA jack shield. Does that allow the meter to read the rail voltage?

If so, the 120 ohm resistor between primary and secondary ground is open.
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