Anyone with Big Guns manual tell me where Q5 transistor is on power supply board please

[Andy B]

Having reset problems on my Williams Big Guns.

Going down the repair guide list of things to change and have done all the capacitors and the BR on the power supply board.

Next thing on list is transistor at Q5.

Can I for the life of me see which is Q5 on the Power Supply board diagram in the manual!

Anyone got a decent version of the manual and can tell me which is Q5 please?

Thanks

Andy

 

[David_Vi]

Definitely the power supply, not the aux power supply?

The manual is on ipdb, but the image quality is so awful. So I looked at Diners manual which is clearer, I can't find Q5

 

[David_Vi]

It's the huge boy that isn't labelled

 

[Moonraker]

It's the one in the large heat sink page 40 of 59 in the pdf - 2N6057

https://www.ipdb.org/files/250/Williams_1987_Big_Guns_Manual.pdf

@David_Vi beat me to it.

 

[Andy B]

It's the huge boy that isn't labelled

View attachment 231539

Hah! I have that scan printed off in hard copy and of course there it is clearly marked as Q5 - I just wasn’t looking in the right place!

That’ll have heat sink compound as well then - more expense.

 

[Andy B]

It's the one in the large heat sink page 40 of 59 in the pdf - 2N6057

https://www.ipdb.org/files/250/Williams_1987_Big_Guns_Manual.pdf

@David_Vi beat me to it.

Hah! I have that scan printed off in hard copy and of course there it is clearly marked as Q5 - I just wasn’t looking in the right place!

That’ll have heat sink compound as well then - more expense.