Hi guys need help to fix a PL700B i recently acquired serial number 647-003B.When i received it the right channel was working perfectly and the left channel was distorting badly.I discovered that the left channel bottom fuse was missing,so I put in a new fuse and turned it on only to witness the a few resistors flame up and a blown test speaker .Also the switch for the vu meters is missing so somebody in the past has removed it (probably the reason why the meters don't work).
Any way I have removed the main pcb it is the PL-14B ..I would like to restore it back to its original form .I have been looking all over the net to find info on this exact board and have not been able to find the original.Work has been done to the amp previously by during its life,parts have been changed to non original parts also seems like a little circuit board has been added not sure what it does .I have read alot of info on the forum however Im totally confused as to which parts are the originals.So im going to need your help.My knowledge is very limited so please feel free to assist. Does anybody have a PCB diagram or a parts placement diagram of this particular board.Also the transistors on the back of the amp are mixed with up 3 XPL909 ,2 RCA410..something cant see the numbers have erased ..and the rest are MJ15024.
The right channel has the RCA40412V1 but on the blown left channel has been replaced with an M2N 6557(is there an easier to find more common replacement for the RCA40412V1)
Q7 is MJE15031 and Q10 is MJE 15030 on both channels
I will add photos as soon as I can workout how to upload them ...Thanks in advance
Any way I have removed the main pcb it is the PL-14B ..I would like to restore it back to its original form .I have been looking all over the net to find info on this exact board and have not been able to find the original.Work has been done to the amp previously by during its life,parts have been changed to non original parts also seems like a little circuit board has been added not sure what it does .I have read alot of info on the forum however Im totally confused as to which parts are the originals.So im going to need your help.My knowledge is very limited so please feel free to assist. Does anybody have a PCB diagram or a parts placement diagram of this particular board.Also the transistors on the back of the amp are mixed with up 3 XPL909 ,2 RCA410..something cant see the numbers have erased ..and the rest are MJ15024.
The right channel has the RCA40412V1 but on the blown left channel has been replaced with an M2N 6557(is there an easier to find more common replacement for the RCA40412V1)
Q7 is MJE15031 and Q10 is MJE 15030 on both channels
I will add photos as soon as I can workout how to upload them ...Thanks in advance