Burnt through resistor, but what's its original value Lyrica SUP041EU

[coenio71]

Dear Saeco forum specialists; i have a little problem with my machine. The door switch caused a short cirquit on my powerpoard (SAECO IG 1.9.30.231.00_v00) and blown the fuse (F2) and a ( i assume) resistor closeby, near the 8-legged switching chip (Q0265R).

Does someone have a value of this resistor ( called C78) or does anybody have the electrical drawing somewhere available?

Sorry for non german post, am not a native german speaker.

Vielen dank!

 

[coenio71]

Dear Saeco forum specialists; i have a little problem with my machine. The door switch caused a short cirquit on my powerpoard (SAECO IG 1.9.30.231.00_v00) and blown the fuse (F2) and a ( i assume) resistor closeby, near the 8-legged switching chip (Q0265R).

Does someone have a value of this resistor ( called C78) or does anybody have the electrical drawing somewhere available?

Sorry for non german post, am not a native german speaker.

Vielen dank!

just something new (as some of you probably noticed) that i assued C78 to be a resistor but it is more likely to be a ceramic capacitor.

My apologies!

 

[hmilbradt]

The short has damaged the switching power supply. Normally it creates regulated 8 VDC and 24 VDC. The 8-pin DIL-chip Q0265R is a Fairchild switching regulator. All capacitors are marked with a C and a number on the board. Since ceramic SMD capacitors are not labeled by the manufacturer and Saeco does not publish schematics, nobody can tell you the correct value of capacitance. Try a 100 nF substitute and see what happens.

regards
Harry

 

[danikd]

Hello, any updates on this? I have the same blown fuse F2 a C78 cap in a strange white color - compared to another capsule on PCB (sand color). See attached photo. Seems to be not shorted. Mulfunction was sudden, completely cleaned machine, news seals, everything was OK, 50 cups of coffee, after last manualy powered off with front button and machine KO. No sign of life, blown fuse F2. Replaced fuse F2 for test, imediatelly fuse is blown again. Is Q0265R problem? Or what I have to measure? Many thx for info. Daniel

 

[ksb]

Hello danikd
if C78 is not shorted the Q0265R is damaged.
Best regards
KSB

 

[danikd]

Hello,

many thx, I want to change F2 and Q0265R and see ...
Regards ...

Daniel

 

[Richard-53]

Hello danikd,
check the function of DB1

 

[danikd]

Hello, OK, I will replace it for sure, its very cheap. Many thx. Daniel

 

[Richard-53]

Hi Daniel,
why not first measure and locate the error.
Swapping parts on suspicion is a bad repair

 

[danikd]

You are right! Later today I will be ordering something else in TME, thats why my laziness. I measure it and it has one output shorted ( + and one output ) - see photo. What measure next? Thx

 

[Richard-53]

Daniel I do not know what you have for knowledge and skills.
Remove the diode bridge DB1 but be careful that the pats are not damaged.
Do you know how to measure a diode bridge with the diode tester?
If the short shot no longer exists after removing DB1, the error was DB1.
This is also a common mistake.
Also check C 84 if you have the opportunity.

 

[danikd]

Soldering skill very good, measuring not so good, but I hope I done it right :
Both unsoldered.
C84 - seems to be OK - nominal 22uF/400V - measured 22.63uF - ESR 1,1Ohm
DB1 measuring with diode test, see photo for pin numers :
1-2 - 0,597V - OK
1-3 - 0,585V - OK
1-4 - 0,595V - OK
2-1 - 0.596 - OK
2-3 - 0,589 - OK
2-4 - 0,004V - KO - Shorted
So if I measure right way, its shorted diode as on picture.
Also under the DB1, there are little signs of overheating, damaged laquer coating of PCB.
Also on DB1 bottom, there are discoloring on housing.
On previous message there is mistake, short is on negative input.
Now, what can be the cause of this mulfuction? Anything else to measure?
Many thx for your time sir Richard ...

Dan

 

[Iridium]

Hi:
I am right now reparing this PCB and I would like you to give some hints

C78 - Be aware that between GND and Drain there are about 300V DC........so please replace it with a ceramic capacitor that can handle this voltage. I used 1nF 500V.

The PCB could work without this capacitor.........so up to you if you want to replace it.

Were you able to fix it? Just wondering how the stoy ended

Best regards,
Francesc.

 

[Parpalhol]

Bonjour,
I have the same problem with the powerboard of my saeci lirika.
The C78 seems to be burnt, Iridium said "The PCB could work without this capacitor...", please confirm i just have to put it away or is it necessary to bypass C78?

 

[Iridium]

1nF 500V............is working since then.

 

[Parpalhol]

I replaced C78 with a 1nF 600v, it doesn't work.
Perhaps the Q0265R is damaged, but this machine is 6 years old with more than 10 500 coffees, the boiler il leaking, i'm going to buy a delonghi
Many thanks for your help

 

[espressotech]

Hello
as machine minuto turned on the r115 resistor burnt
before that it was replaced and also db1 and fuse were replaced
what can cause such blow up?
regards
Guy

 

[Grisu]

You'll be probably on your own to find such a fault.

 

[espressotech]

for the record it was the transformer big yellow also replacing u4 the current stabilizer did not help it was blown up too.

 

[Grisu]

transformer failed and induced to much voltage, so the rest has been damaged.