Orion HCCA 250r ground - Page 2

ash4kel · 11th September 2011, 01:19 AM

If I'm reading it right ~10 ohms

Perry Babin · 11th September 2011, 02:03 AM

Does it blow the fuse without remote voltage applied?

Are you sure that you don't have the positive and negative connections reversed on the power connector?

ash4kel · 11th September 2011, 03:04 AM

Power is not reversed. And it blows fuses without any speaker, remote voltage, or RCA's attached.

Perry Babin · 11th September 2011, 03:25 AM

What size fuse was it blowing?

ash4kel · 11th September 2011, 04:37 AM

It acts as if it has a a low resistance load. Its not a 0 ohm short. When I plug it in the interior lights of the vehicle dim and then the fuses pop. The whole thing takes 2 to 3 seconds to happen.

ash4kel · 11th September 2011, 04:38 AM

20 amp

Perry Babin · 11th September 2011, 03:32 PM

Confirm that you have ~10 ohms from the gate legs of the power supply transistors in each bank to the first leg of one of the MPSA56s.

If that's OK, you need to check the two MPSA56s. You need to confirm that neither is leaking and that each transistor has two intact junctions. You should remove them from the circuit for this test.

ash4kel · 11th September 2011, 05:53 PM

I have ~10 ohms from the gate legs to the first leg of the A56's. How do I make sure that each transistor is intact and not leaking after they are removed?

Perry Babin · 11th September 2011, 08:53 PM

Remove the two A56s from the circuit (do NOT apply power with them out of the circuit).

Go to the basic transistor testing page (link in sig line below) and find (and read) the parts highlighted in the attached image. Fill in ALL text fields on the applet and post a screen cap of the applet (instructions provided in the applet).

ash4kel · 12th September 2011, 02:50 AM

I attempted to upload the screen shots for the two transistors but encountered an error stating it didn't have a security token. But I can give you the measurments, they are basically the same for both. Only Measurments 1 and 6 on both transistors actually have measurments. Transistor 1 read 3.75M ohm and .638 on diode, and measurment 6 read 3.63M ohms and .635 on diode. All other measurments read OL. On transistor 2, measurment 1 read 3.72M ohms and .631 on diode. Measurment 6 reads 3.53 M ohms and .627 on diode. All other measurments read OL. I hope this makes sense.

11th September 2011, 02:03 AM	#12
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Does it blow the fuse without remote voltage applied? Are you sure that you don't have the positive and negative connections reversed on the power connector? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

11th September 2011, 03:25 AM	#14
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What size fuse was it blowing? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

11th September 2011, 03:32 PM	#17
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Confirm that you have ~10 ohms from the gate legs of the power supply transistors in each bank to the first leg of one of the MPSA56s. If that's OK, you need to check the two MPSA56s. You need to confirm that neither is leaking and that each transistor has two intact junctions. You should remove them from the circuit for this test. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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11th September 2011, 01:19 AM	#11
ash4kel diyAudio Member Join Date: Mar 2011	If I'm reading it right ~10 ohms

11th September 2011, 03:04 AM	#13
ash4kel diyAudio Member Join Date: Mar 2011	Power is not reversed. And it blows fuses without any speaker, remote voltage, or RCA's attached.

11th September 2011, 04:37 AM	#15
ash4kel diyAudio Member Join Date: Mar 2011	It acts as if it has a a low resistance load. Its not a 0 ohm short. When I plug it in the interior lights of the vehicle dim and then the fuses pop. The whole thing takes 2 to 3 seconds to happen.

11th September 2011, 04:38 AM	#16
ash4kel diyAudio Member Join Date: Mar 2011	20 amp

11th September 2011, 05:53 PM	#18
ash4kel diyAudio Member Join Date: Mar 2011	I have ~10 ohms from the gate legs to the first leg of the A56's. How do I make sure that each transistor is intact and not leaking after they are removed?

12th September 2011, 02:50 AM	#20
ash4kel diyAudio Member Join Date: Mar 2011	I attempted to upload the screen shots for the two transistors but encountered an error stating it didn't have a security token. But I can give you the measurments, they are basically the same for both. Only Measurments 1 and 6 on both transistors actually have measurments. Transistor 1 read 3.75M ohm and .638 on diode, and measurment 6 read 3.63M ohms and .635 on diode. All other measurments read OL. On transistor 2, measurment 1 read 3.72M ohms and .631 on diode. Measurment 6 reads 3.53 M ohms and .627 on diode. All other measurments read OL. I hope this makes sense.

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