Help - Faulty 5400 Zero signal quality

[KingPrawn]

Can anybody suggest a fix for my IRC5400? It was working fine but stopped suddenly and now I am getting signal strength but zero quality. I know it is not the LNB as I tried swapping it with my a working Sky dish.

Thanks
KP

[voith driver]

hi kingprawn,
provided you have checked to see if the dish has fallen off the wall or is pointing at the ground, then working on the fact that the sky dish has the signal and your humax has not, then my next move would be to check the psu, it is a common indication again provided you have jumped through the usual hoops, of a psu failure, if you are ok with a volt tester then check the outputs on the psu i think its the 30v line that fails for the signal
hope this helps
voith

[KingPrawn]

thanks for the suggestion I will try that.

[satpaul]

Its the ZD3 30v diode thats gone and blown the 100 ohm resistor r21
see atached file

5400 PSU Kit
C09 1000uF 16v 105°C
C10 1000uF 16v 105°C
C13 1000uF 25v 105°C
C14 1000uF 25v 105°C
C15 470uF 35v 105°C
C16 470uF 35v 105°C
C17 220uF 50v 105°C
C18 220uF 50v 105°C
C19 100uF 50v 105°C
C20 100uF 50v 105°C
C21 1uF 100v 105°C
R21 100 Ohm 0.6w
ZD3 30v Zener Diode 1.6w

[KingPrawn]

Voith Driver & SaT Paul,

Thanks for your help, I never suspected the PSU as it powered up OK, I was thinking of that I would need to buy a new receiver but this fix has given my IRC5400 a new lease of life. It is over 10 years old and still working.

Kind Regards
KP