First comes the spike because of asymmetry. Than it settles to 1V voltage until c5 charges, c5 is there exactly for that purpose.
Its very small housing. It didn't have these problems before from new!
Should I change C5? It measure fine with my meter.
Also what about the 3v0 diode. It says 3v0 Zener added mod sheet
you can temporarily remove C10 and C5, solder C10 to C5 location(+ to resistor R5) to see if it can solve
What meter you are using for capacity measure?
Zener is there to protect bias voltage rise over 3V, not necessary by my opinion.
ELKOs are always good to change in old devices.
My advice is to change it all, often is not obvious but capacitor is totally defective.
it a UNI-T Chinese and to be honest not that good! Not sure if I have all the caps but I can try it
You take out C5 and put C10 into C5 position and the cap positive polar leg connect to R5 (MF2 ?)
What about C11 which is opposite? Should I remove C10, I have another cap of that value lying around
Hi,
It jumped around for a bit and almost seemed like the value was going to stay low but then it settled around 0.15V and dropping. It increase first slightly then starts to drop.
On boot up it jumps to 9V, the voltage bounces around to 0.005V and then climbs back up to 0.15V.
The DC offset it still very high!
Replaced 2 main smoothing caps. and fitted same value cap but not bipolar to C5. Those are all the physical changes...
c5 is most important, the way to go. Anything 10-1000uF can do the test, but must be new.