Re: DC503A S1810 repair/replacement ?
Update:toggle quoted messageShow quoted text
- Locating a new switch was going to be a fools errand
- Repairing the switch also seemed impractical
- I got lucky because the missing signals were simply grounding control
signals F & G depending on the selected function
- Was able to design a small PCB to fit where U1601 was located, and
synthesize the F & G control signals using open-drain 74HC parts
Posted here as encouragement for others who might find themselves in a
Screwed up the rework board in two areas highlighted as A & B in
DC503A is working like a champ now, including period B & width B modes,
which were borked previously.
On Fri, Jul 31, 2020 at 10:48 PM Andy Warner <andyw@...> wrote:
Bought a DC503A a while back (as-is) and finally got around to debugging