Identify CR0 input FET --> "304" in GoldStar OS-9040D

[Graham]

Hi all. The other week I gave the A channel of my scope a voltage spike
it didn't like and soooo I gotta fix it Among other things
there is a source follower FET in the input stage right after the
attenuator. It has written on it "304" then underneath that, "E 5M".
It is definitely dead but I can't seem to work out who makes it to get
replacement or a data sheet to choose a reasonable substitute. Can
anyone help me here?

TIA , GP

 

[Lynn Coffelt]

Hi all. The other week I gave the A channel of my scope a voltage spike
it didn't like and soooo I gotta fix it Among other things
there is a source follower FET in the input stage right after the
attenuator. It has written on it "304" then underneath that, "E 5M".
It is definitely dead but I can't seem to work out who makes it to get
replacement or a data sheet to choose a reasonable substitute. Can
anyone help me here?

TIA , GP

Well, looking at the schematic of my OS-7040, there is a FET 2SK304E.....
sounds like it is probably your "304". That FET Googles up to many places of
data and sales.
Old Chief Lynn

 

[Graham]

Thank you very much, Lynn
And Ben Clarke too.

 

[Enkitec]

"Graham" <[email protected]> wrote in message
news:[email protected]...
> Hi all. The other week I gave the A channel of my scope a voltage spike
> it didn't like and soooo I gotta fix it Among other things
> there is a source follower FET in the input stage right after the
> attenuator. It has written on it "304" then underneath that, "E 5M".
> It is definitely dead but I can't seem to work out who makes it to get
> replacement or a data sheet to choose a reasonable substitute. Can
> anyone help me here?
>
> TIA , GP

Well, looking at the schematic of my OS-7040, there is a FET 2SK304E.....
sounds like it is probably your "304". That FET Googles up to many places of
data and sales.
Old Chief Lynn

Lynn,

Would you scan the OS-7040 schematic and send it to me?
I need to repair one of these and have no docs.

Thanks.
Mark