hi all,
i got this onkyo amp recently and the left channel in it was not working. (It just gives a deep bass sound and goes in to protect mode) The right channel's working fine. It has mn2488/mp1620 transistor pair for the amp and it has few other small transistor before it goes in to the mn1620/mp1620.
I measured the resistance across the emitter/collector in them and all of them show open circuits(for both Rch and Lch). So i'm guessing they are ok. But when i mesure voltage across the same pins, right ch trans. stay contant at 57v but in the left ch. one of them is at 47 and the other is at 70v.
So does this mean that the left trans. pair is blown or could it be some other problem. (there are 3 more transistors between the preamp input and main transistor input, i chekd them for resistance but they seem to be ok as well.
hope im making sense
. Juz wanna figure out if its the mn1620/mp2488 that has the problem or not. also is there anything else i cud measre to check.
thanks for any help...:>
i got this onkyo amp recently and the left channel in it was not working. (It just gives a deep bass sound and goes in to protect mode) The right channel's working fine. It has mn2488/mp1620 transistor pair for the amp and it has few other small transistor before it goes in to the mn1620/mp1620.
I measured the resistance across the emitter/collector in them and all of them show open circuits(for both Rch and Lch). So i'm guessing they are ok. But when i mesure voltage across the same pins, right ch trans. stay contant at 57v but in the left ch. one of them is at 47 and the other is at 70v.
So does this mean that the left trans. pair is blown or could it be some other problem. (there are 3 more transistors between the preamp input and main transistor input, i chekd them for resistance but they seem to be ok as well.
hope im making sense
thanks for any help...:>