Gen 1 250 hcca orion

SS64 · 19th March 2010, 11:06 PM

Ok have another first gen 250 on the bench.. bad driver bad output and bad parts in the supply.. no big deal.. now the left channel is distorted but still plays.. figured it must have been a weak output.. replaced them all.. noise is still there.. replaced all the drivers.. noise is still there.. replaced both OP amps. noise is still there..replaced numerous caps.. and still have the distortion.. I don't have a scope to trace the signal.. Are there any common things that would cause this symptom?

1moreamp · 20th March 2010, 02:06 AM

Sounds like front end issues to me. By your description you have gutted the main amp channel completely, this leaves nothing but bad ICs in the front end section....

Long time no talk to, hope all is well your way.....C

SS64 · 20th March 2010, 03:57 AM

are there any other part numbers that will sub out for the ne5534's? I'm out at the moment and dont feel like sticking too much money into this amp.
And right back at ya 1more. been busy ... lifes been happing... i havent had much time to dedicate to amps anymore.. Hope everything is well on your end too bud..

Perry Babin · 20th March 2010, 05:30 AM

Driver transistors open or leaking?

Open or out of tolerance resistors on the driver transistors?

SS64 · 21st March 2010, 03:30 PM

I replaced all the drivers.. they are new.. but i will do it all again... I didnt check the resistors yet... no visual burns.. I'll go buy some more drivers tomorrow and do a thorough ohm check on all the resistors.. what are the values of the ones I should focus on?

Perry Babin · 21st March 2010, 03:42 PM

The 75 ohm resistors are the ones that fail most often.

SS64 · 22nd March 2010, 10:43 PM

The 75 ohm res. seem to be ok.. they check fine that is... replaced the drivers again .. no change.. replaced the 5534 no change.. got access to a scope for a little bit today.. with a 60 hz tone I have a good wave going into the 5534 on the front end and a good wave coming all the way to the second 5534.. now the output from that second 5534 is another story.. it has a horribly distorted wave.. looks almost like a square wave but not quite.. any ideas?

Perry Babin · 23rd March 2010, 05:04 AM

The output of the op-amp that drives the diode array via 2.7 ohm resistor won't have normal audio. What did the output of the distorted channel look like?

19th March 2010, 11:06 PM	#1
SS64 diyAudio Member Join Date: Mar 2008	Gen 1 250 hcca orion Ok have another first gen 250 on the bench.. bad driver bad output and bad parts in the supply.. no big deal.. now the left channel is distorted but still plays.. figured it must have been a weak output.. replaced them all.. noise is still there.. replaced all the drivers.. noise is still there.. replaced both OP amps. noise is still there..replaced numerous caps.. and still have the distortion.. I don't have a scope to trace the signal.. Are there any common things that would cause this symptom? __________________ It isn't fun unless it can kill you!

20th March 2010, 03:57 AM	#3
SS64 diyAudio Member Join Date: Mar 2008	are there any other part numbers that will sub out for the ne5534's? I'm out at the moment and dont feel like sticking too much money into this amp. And right back at ya 1more. been busy ... lifes been happing... i havent had much time to dedicate to amps anymore.. Hope everything is well on your end too bud.. __________________ It isn't fun unless it can kill you!

20th March 2010, 05:30 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Driver transistors open or leaking? Open or out of tolerance resistors on the driver transistors? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

21st March 2010, 03:30 PM	#5
SS64 diyAudio Member Join Date: Mar 2008	I replaced all the drivers.. they are new.. but i will do it all again... I didnt check the resistors yet... no visual burns.. I'll go buy some more drivers tomorrow and do a thorough ohm check on all the resistors.. what are the values of the ones I should focus on? __________________ It isn't fun unless it can kill you!

21st March 2010, 03:42 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The 75 ohm resistors are the ones that fail most often. __________________ 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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20th March 2010, 02:06 AM	#2
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	Sounds like front end issues to me. By your description you have gutted the main amp channel completely, this leaves nothing but bad ICs in the front end section.... Long time no talk to, hope all is well your way.....C

22nd March 2010, 10:43 PM	#7
SS64 diyAudio Member Join Date: Mar 2008	The 75 ohm res. seem to be ok.. they check fine that is... replaced the drivers again .. no change.. replaced the 5534 no change.. got access to a scope for a little bit today.. with a 60 hz tone I have a good wave going into the 5534 on the front end and a good wave coming all the way to the second 5534.. now the output from that second 5534 is another story.. it has a horribly distorted wave.. looks almost like a square wave but not quite.. any ideas? __________________ It isn't fun unless it can kill you!

23rd March 2010, 05:04 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The output of the op-amp that drives the diode array via 2.7 ohm resistor won't have normal audio. What did the output of the distorted channel look like? __________________ 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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