Troubleshooting MS275

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Eriksen
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Joined: Mon Mar 07, 2016 8:50 am

Troubleshooting MS275

Post by Eriksen »

Have trouble with my Great amp..MS275... When the to internal fuses are removed it seems ok. When i put the fuses in, it drives a lot off ampere.I have nothing connected at the output. Should the 4 red internal leds light up When all is ok. I need tips to fix the amp.. plass help an PG fan..
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Eric D
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Joined: Sat Dec 30, 2006 8:50 am

Re: Troubleshooting MS275

Post by Eric D »

Yes, you want the 4 red LEDs to light up. In your case, you could have a lot of possible problems. Any short in an output transistor, or any of the upstream transistors which make up "triple-darlington", will cause significant current draw. There are some fusable resistors sitting around these transistors, and if they are open, the output may drift, and draw a lot of current. You could also have a short from the bottom plate of your main output transistors to the heatsink (rare, but possible).
Got "schooled" by member shawn k on May 10th, 2011...
No longer really "in tune" with the audio industry, and probably have not been for some time.
Hands down the forum's most ignorant member...
Don't even know what Ohm's law is...
Eriksen
Posts: 2
Joined: Mon Mar 07, 2016 8:50 am

Re: Troubleshooting MS275

Post by Eriksen »

Do you have the wiring diagram for the ms275?
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Eric D
Short Bus Driver
Posts: 4255
Joined: Sat Dec 30, 2006 8:50 am

Re: Troubleshooting MS275

Post by Eric D »

Got "schooled" by member shawn k on May 10th, 2011...
No longer really "in tune" with the audio industry, and probably have not been for some time.
Hands down the forum's most ignorant member...
Don't even know what Ohm's law is...
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