Help, Mr. Perry Babin !! Orion 225 HCCA trouble - Page 3

Perry Babin · 5th February 2012, 07:58 PM

There should be only one capacitor behind it. In this amp, it's black.

Yusef71 · 6th February 2012, 12:19 AM

I've replaced that capacitor, still no change. Any more ideas as to what could have gone wrong ?

Perry Babin · 6th February 2012, 06:29 AM

No change from what? You stated that it started working properly. How have the voltages changed (or remained the same)?

Yusef71 · 6th February 2012, 08:20 AM

I mean, the amplifier still turns on and off sporadically. The early post I meant to say that it turned on, but, it did not remain turned on for long. I apologize for any misunderstandings.

Perry Babin · 6th February 2012, 04:41 PM

I know of nothing that can drag the voltage down on one end of the large resistor if the large transistor is out of the circuit and the capacitor is not defective. Are you sure that there are no solder bridges anywhere on the board?

Yusef71 · 7th February 2012, 10:04 AM

I thoroughly looked for any solder bridge, I found none. Could the toroidal power transformer have a short with in it's windings ? It also heats up abnormally as does the large power resistor.

Perry Babin · 7th February 2012, 08:59 PM

What is the DC voltage across each of the two resistors indicate by the arrows in the attached photo.

You need to measure the voltage when the large resistor is getting hot. I'm assuming that the large transistor is still out of the circuit. If it's not, remove it.

Yusef71 · 8th February 2012, 11:17 AM

The attached photo showing the two resistors is missing in your post, could you please re-post them ?

Perry Babin · 8th February 2012, 04:30 PM

See attached.

Yusef71 · 10th February 2012, 10:21 PM

I've measured the voltage at both of those resistors. The voltage measurements fluctuated between 2.57 V to 3.57 V. Note, the large resistor remained hot during all the measurements.

6th February 2012, 06:29 AM	#23
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	No change from what? You stated that it started working properly. How have the voltages changed (or remained the same)? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

6th February 2012, 04:41 PM	#25
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I know of nothing that can drag the voltage down on one end of the large resistor if the large transistor is out of the circuit and the capacitor is not defective. Are you sure that there are no solder bridges anywhere on the board? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

7th February 2012, 08:59 PM	#27
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What is the DC voltage across each of the two resistors indicate by the arrows in the attached photo. You need to measure the voltage when the large resistor is getting hot. I'm assuming that the large transistor is still out of the circuit. If it's not, remove it. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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6th February 2012, 12:19 AM	#22
Yusef71 diyAudio Member Join Date: Jan 2012 Location: San Marcos, Texas	I've replaced that capacitor, still no change. Any more ideas as to what could have gone wrong ?

6th February 2012, 08:20 AM	#24
Yusef71 diyAudio Member Join Date: Jan 2012 Location: San Marcos, Texas	I mean, the amplifier still turns on and off sporadically. The early post I meant to say that it turned on, but, it did not remain turned on for long. I apologize for any misunderstandings.

7th February 2012, 10:04 AM	#26
Yusef71 diyAudio Member Join Date: Jan 2012 Location: San Marcos, Texas	I thoroughly looked for any solder bridge, I found none. Could the toroidal power transformer have a short with in it's windings ? It also heats up abnormally as does the large power resistor.

8th February 2012, 11:17 AM	#28
Yusef71 diyAudio Member Join Date: Jan 2012 Location: San Marcos, Texas	The attached photo showing the two resistors is missing in your post, could you please re-post them ?

10th February 2012, 10:21 PM	#30
Yusef71 diyAudio Member Join Date: Jan 2012 Location: San Marcos, Texas	I've measured the voltage at both of those resistors. The voltage measurements fluctuated between 2.57 V to 3.57 V. Note, the large resistor remained hot during all the measurements.

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