still trying to fix my onix a-120...

miekedmr · 18th February 2006, 01:05 AM

OK... as far as I can tell, I have replaced every broken component and all the soldering joints are good. The protect light still comes on on the side that had broken. The power transistors were Sanken A1386 and C3519, which were replaced with MJL1302A and MJL3281A. From what I read these are good replacements, but I was wondering if the protect circuit could be sensitive to the change? Other parts replaced:
1 D669A, 1 B649A, two 100ohm resistors 1% tolerance, 10uF 50V cap replaced with 10uf 250V cap
I don't know enough to do anything besides diagnose and replace individual parts, so any help would be greatly appreciated.
Do you think I could email Onix and get a schematic?

miekedmr · 18th February 2006, 05:08 PM

No one has responded to my posts...
No advice, nothing. I don't get it.

anatech · 18th February 2006, 05:20 PM

Hi miekedmr,
Yes, get the diagram. From a remote location, we can't see the circuit and therefore don't have a good idea as to the layout. We can not give advice without knowing what the circuit looks like.

If you can then scan the circuit, we can help you.

-Chris

fiak · 18th February 2006, 06:33 PM

Why don't you deactivate the protections.
Those divices are made for people not involved in electronics, e.t.c.
Anyway extra rellays degrade the sound quality.

anatech · 18th February 2006, 06:42 PM

Hi fiak,
No. Poor advice.

An output relay sounds better than a fuse. A fuse sounds better than flames. Insurance will not cover if they find equipment safety has been degraded or defeated.

We went over this in another thread. Never defeat existing safety precautions. I have over 30 yrs of service experience to back me up on that one.

-Chris

fiak · 18th February 2006, 08:54 PM

Hi Chris.
Since it is a matter of security,I accept your point of view.
-I have to do it anyway, it will be used against me-

Anastasio.

Zen Mod · 18th February 2006, 09:17 PM

advice from someone who repair amps (and similar #$%&***!) for a living:
when you are in that situation (selective replacements are not effective) replace all smaller active devices in that channel,also diodes;
trust me-in 90% of repairs ,that's fastest and most secure way.........

anatech · 19th February 2006, 01:43 AM

Hi choky,
It helps to look at the pretty picture sometimes too.

After you are burned enough times in service you recognise amplifier types. Given a choice I'll always look at the schematic if I can.

-Chris

Zen Mod · 19th February 2006, 02:07 AM

Quote:

Originally posted by anatech
Hi choky,
It helps to look at the pretty picture sometimes too.

After you are burned enough times in service you recognise amplifier types. Given a choice I'll always look at the schematic if I can.

-Chris

Leolabs · 19th February 2006, 06:04 AM

Why not post the internal picture of it???

18th February 2006, 01:05 AM	#1
miekedmr diyAudio Member Join Date: Jun 2005 Location: ny, usa	still trying to fix my onix a-120... OK... as far as I can tell, I have replaced every broken component and all the soldering joints are good. The protect light still comes on on the side that had broken. The power transistors were Sanken A1386 and C3519, which were replaced with MJL1302A and MJL3281A. From what I read these are good replacements, but I was wondering if the protect circuit could be sensitive to the change? Other parts replaced: 1 D669A, 1 B649A, two 100ohm resistors 1% tolerance, 10uF 50V cap replaced with 10uf 250V cap I don't know enough to do anything besides diagnose and replace individual parts, so any help would be greatly appreciated. Do you think I could email Onix and get a schematic?

18th February 2006, 09:17 PM	#7
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	advice from someone who repair amps (and similar #$%&*!) for a living: when you are in that situation (selective replacements are not effective) replace all smaller active devices in that channel,also diodes; trust me-in 90% of repairs ,that's fastest and most secure way......... __________________ my Papa is smarter than your Nelson ! tnx to clean** thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
ONIX OA21s	hudsy	Parts	0	22nd February 2009 10:05 AM
Fs: Onix A60	jimmyd53	Swap Meet	1	19th March 2008 08:01 PM
Onix OA 601 Humming ?	Rob louth	Solid State	0	9th January 2008 09:22 PM
Onix oa 24	Rob louth	Solid State	1	16th November 2004 04:04 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

18th February 2006, 05:08 PM	#2
miekedmr diyAudio Member Join Date: Jun 2005 Location: ny, usa	No one has responded to my posts... No advice, nothing. I don't get it.

18th February 2006, 05:20 PM	#3
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi miekedmr, Yes, get the diagram. From a remote location, we can't see the circuit and therefore don't have a good idea as to the layout. We can not give advice without knowing what the circuit looks like. If you can then scan the circuit, we can help you. -Chris

18th February 2006, 06:33 PM	#4
fiak diyAudio Member Join Date: Mar 2005 Location: Athens	Why don't you deactivate the protections. Those divices are made for people not involved in electronics, e.t.c. Anyway extra rellays degrade the sound quality.

18th February 2006, 06:42 PM	#5
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi fiak, No. Poor advice. An output relay sounds better than a fuse. A fuse sounds better than flames. Insurance will not cover if they find equipment safety has been degraded or defeated. We went over this in another thread. Never defeat existing safety precautions. I have over 30 yrs of service experience to back me up on that one. -Chris

18th February 2006, 08:54 PM	#6
fiak diyAudio Member Join Date: Mar 2005 Location: Athens	Hi Chris. Since it is a matter of security,I accept your point of view. -I have to do it anyway, it will be used against me- Anastasio.

19th February 2006, 01:43 AM	#8
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi choky, It helps to look at the pretty picture sometimes too. After you are burned enough times in service you recognise amplifier types. Given a choice I'll always look at the schematic if I can. -Chris

19th February 2006, 06:04 AM	#10
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Why not post the internal picture of it???

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)