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5th July 2010, 10:41 AM
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#1 |
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diyAudio Member
Join Date: Jul 2010
Location: Vittorio Veneto
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Phoenix Gold ms 2125 "Disaster" Help !!!!
Hy, I'm a new member from Italy...
I have a glorious Phoenix Gold MS-2125 board rev C that had multiple damages... I have replaced all power Mosfets of the right side...all imput caps....all rail caps, some resistors and diodes... Yesterday I tried to power it... AHHHHHH !!!!!!  Right side: the two internal leds is on Left side : dead... Green power led : off !!!! Yellow led: ON !! Red overloal led : off Left clip red led : off Right clip red led : ON !!!!  What can I do ? I don't know from where to start !!! Thank in advance to all !!!! |
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5th July 2010, 07:15 PM
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#3 |
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diyAudio Member
Join Date: Dec 2005
Location: Northern California
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On the right channel look for Q222 and Q223 and replace them and the clip issue should be resolved , unless the channel has other issues. This is a common issue with these amps when they have been driven into overload clip abusively.
I do not have a spec for the thermal sensors as I have never had to replace any of them. PG/AAMP of Florida aka Stinger might be helpful with these as I know of no other source currently. For temporary operation you can try 100 or 1000 ohm resistors in place of the missing devices. The Yellow LED being on indicates that the amp is in thermal overload due to the missing thermal sensors, and this will shutdown the amps operations until it is resolved somehow... The leds in the channel that are blown open are also typical of a amp that has been abused. You have two options here. 1 replace the leds with exact replacements types or 2 replace the single led with two 1n4148 diodes The LED is selected for its specific voltage drop and has the same Voltage drop as two 1n4148 diodes Hope this helps some....Ciao 
Last edited by 1moreamp; 5th July 2010 at 07:43 PM. Reason: channel leds opps... |
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6th July 2010, 07:54 AM
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#6 |
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diyAudio Member
Join Date: Jul 2010
Location: Vittorio Veneto
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6th July 2010, 05:18 PM
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#7 | |
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diyAudio Member
Join Date: Dec 2005
Location: Northern California
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Quote:
To battery test I use a lithium battery from a computer motherboard. It has the correct voltage and its edges will just connect on the bottom of the amp PC board. The green led will not light up as long as the thermal sensors are missing. The thermal circuitry will shut down the amp and the green led...Ciao...
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6th July 2010, 05:24 PM
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#8 | |
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diyAudio Member
Join Date: Dec 2005
Location: Northern California
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Quote:
Octopart - Electronic Parts, Electronic Components, Datasheets FindChips.com Search Please try the above links for parts search. Those transistors are fairly routine so they should be out there. Many amp makers use them so they should be plentiful.....
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6th July 2010, 05:32 PM
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#9 | |
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diyAudio Member
Join Date: Dec 2005
Location: Northern California
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Quote:
I have a MS-2250 here in just as bad a shape. Seems people dump them after they fry them. PG still has boards for these last I heard. I am sure they want a pretty penny for them though... Oh please check all the Fuse type resistors in the channels. They are green and grey body colored resistors. Mostly low values like 68 ohms and 50 ohms, and 22 ohms they open up on failures to prevent even worse damage. Please replace them with only fuse type resistors....Ciao...
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7th July 2010, 06:40 AM
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#10 |
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diyAudio Member
Join Date: Jul 2010
Location: Vittorio Veneto
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I envy your knowledge and where you live too !
 I'll try to search components.... Using a 100 ohm resistor in place of thermal res yellow led go off and power green led light on !!!!!!!!!  ....but amp "eat" a ton of current !!! (4-5 ampere)  Have tested all resistors on both channel and are all ok ! Leds are ok Transistors seems to be ok..... UFF !!!! so if all components ok...why right channel CLIP and left channel DEAD ? This evening will make other tests.... WOW !! an 2250 !!!! I hope you repair it !!!! Thank U very much.... |
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