driessens_nl
New Member
- Messages
- 4
- Location
- Maastricht
A friend of mine has a defective ESAM DTB 250. There are at least 2 issues:
- first a couple of paper capacitors (well known yellow RIFA's) burned. But as these are only there for interference suppression these can be left out for now.
- a fuse of the 10v AC circuit keeps tripping. It's the fuse in the circuit of wire 117 en 118.
Some fault finding showed that the capacitors C35 en C46 on AP01 are in shortcut. Now I'm wondering what could cause this, age (machine is almost 30 years) or maybe a defective thyristor. As far as I could I tried to measure them butI could not reach the all.
What are the risks if I only replace (all?) capacitors on the board and try again ?
Schematic of the machine is attached.
- first a couple of paper capacitors (well known yellow RIFA's) burned. But as these are only there for interference suppression these can be left out for now.
- a fuse of the 10v AC circuit keeps tripping. It's the fuse in the circuit of wire 117 en 118.
Some fault finding showed that the capacitors C35 en C46 on AP01 are in shortcut. Now I'm wondering what could cause this, age (machine is almost 30 years) or maybe a defective thyristor. As far as I could I tried to measure them butI could not reach the all.
What are the risks if I only replace (all?) capacitors on the board and try again ?
Schematic of the machine is attached.