Re: FG 504 problems
Thanks for that info, Dan. Would you believe that when my wife brought me a mug of tea in bed this morning, I was reading the FG 504 Manual and noticed where the jumper is marked on the schematic. I think I was thrown as to its circuit location by the physical location on the circuit board. However, that revelation left me with the puzzle of which was the default (non-VCF) position and I was wondering as to how I might investigate that, when I looked at my email and your reply gave me the answer!toggle quoted messageShow quoted text
I still have some problems with the Function Generator (though I have fixed one) which relate to the symmetry adjustments.
An earlier problem involved the power-rails and one going bad after I'd measured it to be OK. That turned out to be a harmonica-type connector giving bad contact, so I re-seated all of those that I could locate, which solved that problem, but then left me with the question of whether I had put the W20 jumper back properly or not. You have now clarified that for me.
I wonder why this wasn't clearer in the Manual?
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dan G
Sent: 08 August 2020 01:15
Subject: Re: [TekScopes] FG 504 problems
On Fri, Aug 7, 2020 at 03:41 PM, Colin Herbert wrote:
While its position is shown onHi Colin,
The W20 jumper is shown on schematic <1> ("Triangle Wave Generator" in
post-B040000 service manuals, and "Main Loop" in early editions.) It
is shown in the upper left corner of the schematic, just above "VCF INPUT".
The jumper is in the N/C position when it is placed toward the back of the
plug-in. Moving it to the front of the plug-in routes the VCF Input signal