Help with Orion HCCA250 dead

morpheus82 · 26th April 2010, 03:48 PM

Hi guys,
i have an orl orion hcca250 completely dead. Cosmetically in great condition, no missing parts or blown parts. But it does not switch on, seems to have supply issues.
I only noticed the transistor near the lm7815 is quite warm, does it mean anything?
Thanks a lot in advance!

Perry Babin · 26th April 2010, 04:13 PM

Can you post a photo of the board so we can see which one you have?

morpheus82 · 26th April 2010, 04:20 PM

Hi,
it is this one:

Not exactly mine, but just to understand the series.
For the board, maybe this evening I will download the pics to my pc.
Do you have any idea?Known problems?

Perry Babin · 26th April 2010, 04:22 PM

I don't know which board it has by looking at the outside. There was some overlap between board revisions and the various models.

morpheus82 · 26th April 2010, 04:26 PM

Fine, just wait some hours and you'll get the pic...;-)

morpheus82 · 26th April 2010, 08:03 PM

here's the pic:

morpheus82 · 26th April 2010, 08:05 PM

another one:

Perry Babin · 27th April 2010, 01:46 AM

With your multimeter set to DC volts and the black meter probe on the shield of the RCA jacks, what is the DC voltage on the transistors connected to the large green resistors?

You don't have to post the voltage for each one. You simply need to determine if they have approximately 25v (both positive and negative) on their legs.

morpheus82 · 27th April 2010, 07:13 AM

Thanks Perry,
so I have to check the voltage on the transistors, fine. I'm not at home now, so I will check on friday, and let you know the results...

morpheus82 · 30th April 2010, 09:46 PM

ok guys, here we go...
I'm checking the tl494, switching controller.
Pin 12 has 9V supply, and on pins 8 and 9 i see something like 20kHz switching frequency, is it possible?(i checked with the multimeter, don't have oscilloscope here).
So the tl494 drives the mpsa06 and mpsa56 and they drive the power mosfets(smp60n06).
Probably one of the two is burned?

I didn't have removed any of the power mosfets for now, but between drain and gate i see(checking the diode with multimeter) 250mV both sides...
Maybe someone is broken?

26th April 2010, 03:48 PM	#1
morpheus82 diyAudio Member Join Date: Oct 2004	Help with Orion HCCA250 dead Hi guys, i have an orl orion hcca250 completely dead. Cosmetically in great condition, no missing parts or blown parts. But it does not switch on, seems to have supply issues. I only noticed the transistor near the lm7815 is quite warm, does it mean anything? Thanks a lot in advance!

26th April 2010, 04:13 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Can you post a photo of the board so we can see which one you have? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

26th April 2010, 04:22 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I don't know which board it has by looking at the outside. There was some overlap between board revisions and the various models. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

27th April 2010, 01:46 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	With your multimeter set to DC volts and the black meter probe on the shield of the RCA jacks, what is the DC voltage on the transistors connected to the large green resistors? You don't have to post the voltage for each one. You simply need to determine if they have approximately 25v (both positive and negative) on their legs. __________________ 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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26th April 2010, 04:20 PM	#3
morpheus82 diyAudio Member Join Date: Oct 2004	Hi, it is this one: Not exactly mine, but just to understand the series. For the board, maybe this evening I will download the pics to my pc. Do you have any idea?Known problems?

26th April 2010, 04:26 PM	#5
morpheus82 diyAudio Member Join Date: Oct 2004	Fine, just wait some hours and you'll get the pic...;-)

26th April 2010, 08:03 PM	#6
morpheus82 diyAudio Member Join Date: Oct 2004	here's the pic:

26th April 2010, 08:05 PM	#7
morpheus82 diyAudio Member Join Date: Oct 2004	another one:

27th April 2010, 07:13 AM	#9
morpheus82 diyAudio Member Join Date: Oct 2004	Thanks Perry, so I have to check the voltage on the transistors, fine. I'm not at home now, so I will check on friday, and let you know the results...

30th April 2010, 09:46 PM	#10
morpheus82 diyAudio Member Join Date: Oct 2004	ok guys, here we go... I'm checking the tl494, switching controller. Pin 12 has 9V supply, and on pins 8 and 9 i see something like 20kHz switching frequency, is it possible?(i checked with the multimeter, don't have oscilloscope here). So the tl494 drives the mpsa06 and mpsa56 and they drive the power mosfets(smp60n06). Probably one of the two is burned? I didn't have removed any of the power mosfets for now, but between drain and gate i see(checking the diode with multimeter) 250mV both sides... Maybe someone is broken?

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