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Old 18th February 2006, 01:05 AM   #1
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Default 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?
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Old 18th February 2006, 05:08 PM   #2
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No one has responded to my posts...
No advice, nothing. I don't get it.
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Old 18th February 2006, 05:20 PM   #3
anatech is offline anatech  Canada
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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
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Old 18th February 2006, 06:33 PM   #4
fiak is offline fiak  Europe
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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.
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Old 18th February 2006, 06:42 PM   #5
anatech is offline anatech  Canada
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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
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Old 18th February 2006, 08:54 PM   #6
fiak is offline fiak  Europe
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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.
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Old 18th February 2006, 09:17 PM   #7
Zen Mod is offline Zen Mod  Serbia
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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.........
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Old 19th February 2006, 01:43 AM   #8
anatech is offline anatech  Canada
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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
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Old 19th February 2006, 02:07 AM   #9
Zen Mod is offline Zen Mod  Serbia
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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

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Old 19th February 2006, 06:04 AM   #10
Leolabs is offline Leolabs  Malaysia
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Why not post the internal picture of it???
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