Jura X90 Capacitor

[stj]

Re: Jura X90 Capacitor

cracked solder joints - lots of them.

inc the white molex connector at the bottom and the transistor with a heatsink hotglued(??) to the relays at the top

[mikay786]

Re: Jura X90 Capacitor

I'll give them all a check,

What about the no AC readings on the 15v out on the transformer?

[stj]

Re: Jura X90 Capacitor

check the resistance of the winding
btw, given how extortionate they are - i would not use a new original transformer.

[mikay786]

Re: Jura X90 Capacitor

How do I check resistance, I mean between what contact, both inputs or both both 15v output pins. Or from input to output?

The one I linked to earlier in the thread is only £15 pretty good, says seller refurbished but assume are just pulls from used machines.

[mikay786]

Re: Jura X90 Capacitor

Resistance is 1.3ohm on the secondary 15v side

[stj]

Re: Jura X90 Capacitor

then it's good
(probably)
it should not show anything if you meter between the 15v and 9v or primary btw.

[mikay786]

Re: Jura X90 Capacitor

It's 0L on the input side though?

[stj]

Re: Jura X90 Capacitor

hmm.
the input should be readable, so should both outputs, but not between each other.
if the input is open - all is not lost.

[mikay786]

Re: Jura X90 Capacitor

With the input being open basically suggests a power surge or simple failure.

More importantly if the secondary side was defective would suggest something further down the line drew too much current damaging the secondary side.?

So with that perhaps the board is ok

[stj]

Re: Jura X90 Capacitor

no, the board has broken joints.

now back to the transformer.
make sure the secondary's are both good and neither have a reading to the primary pins or each other.
if that's o.k. we shall investigate the 2 most common failures.
1: wire broken off the terminal
2: blown thermal fuse.

[mikay786]

Re: Jura X90 Capacitor

I mean I read that if something is shorted it would / could damage the secondary side. I will retouch all the joints as do seem a bit brittle.

No reading between seconday side and primary and no reading between 9v and 15v

[stj]

Re: Jura X90 Capacitor

o.k.
well normally if you overload a transformer, the primary takes the hit because the windings are thinner.
to prevent fires, there is a thermal fuse in most transformers - and it can usually be replaced.

but you probably should check the board for shorts - specially the diodes.

[mikay786]

Re: Jura X90 Capacitor

Will do