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pls help.
here is my b500.
first powering up with fuses 53vdc,0,53vdc amp works fine.
i used 2sd669a instead mje340. it works fine .
after one hour i change mje350 to b649a. in near d669a 100ohm resistor burned and fuses blown.
after i remove d669 and 649 with mje340,350 but same problem fuses blown.
can any body help to solve this problem.
here is my b500.
first powering up with fuses 53vdc,0,53vdc amp works fine.
i used 2sd669a instead mje340. it works fine .
after one hour i change mje350 to b649a. in near d669a 100ohm resistor burned and fuses blown.
after i remove d669 and 649 with mje340,350 but same problem fuses blown.
can any body help to solve this problem.
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Hi nazirdigi.
I think pre driver & Out put problem.
1.Teak out all power transister out put.
2.Replace all berned part.
3.Check DC power at attachment.
And surely all power transister out put no short to ground and heatshink.
Regards.
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Last edited:
hi engel dela pen
i removed all power trans and checked 2 trans burned.
i checked the traces its fine.
may be b649 is fake i think.
hi apex sir .
i bought a new transformer for b500. after rectifies it gives 80.0.80vdc .can i use 2.2k resistor for r24,25 or i have to increase the value of resistors? any other changes.
i bought a new transformer for b500. after rectifies it gives 80.0.80vdc .can i use 2.2k resistor for r24,25 or i have to increase the value of resistors? any other changes.
