More parts I need to replace on the VT100

[Julian Wolfe]

Okay, I'm sure that will help.  I'm going to sit down and try to figure this
thing out after spending some time with this book.  Again, this isn't a
hobby-crippling problem, as I'm using my VT220 right now in the VT100's
stead.

Actually, this is more a cleanup and cosmetic thing than anything else right
now - I really don't like having nonworking equipment lying around unless
the useful parts have been stripped out and put away and the excess thrown
away, and also, the VT100 looks so much better with my vintage setup than
the VT220.

I'll get back to you guys on this in a day or so.  Thanks for everyone's
help so far!

> -----Original Message-----
> From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
> On Behalf Of Dwight K. Elvey
> Sent: Wednesday, November 30, 2005 8:32 PM
> To: cctalk at classiccmp.org
> Subject: Re: More parts I need to replace on the VT100
> 
> Hi
>  I looked at the schematic and the parts you'd indicated.
> It looks like one of them was one off and was R55 and not
> D11. From the looks, it might be that you have other failures
> in the supply. You've indicated R11, R21 and R55. These
> are all part of the circuit that drives the primary switcher
> transistor through T3.
>  You might check D11 to make sure it isn't shorted. You
> might want to run the supply separately to check outputs.
> A short in T3 to the mains would also cause a lot of troubles
> and burn these resistors( taking may other part with it ).
> Other parts to look at would be:
> Q2, Q3, Q4, E5 and D4
> These are parts that could also be involved.
>  It does look like there is something other than the
> resistors blown in the supply.
> Dwight
>