psu outputs what should they be

[klegg]

I have PSUs that have had the following output readings in a couple of sat boxes

3.3v, 5v, 12v these never really alternate to much but

there are 2 other outputs that sit within the following ranges on

[18 - 21vdc] and [23 - 37vdc] ranges. The signal and data readings show up ok when the psu outputs are within these ranges.
Would anybody know exactly what the voltage readings should be as I don't have any schematics.

thanks

 

[2cvbloke]

I haven't an answer, but a suggestion, adding the models of the sat boxes would help, as there are thousands of different boxes out there with different PSUs, so narrowing them down to the ones you have would take some time... ;)

 

[Channel Hopper]

Depends what PSU they are from and what they are trying to power.

The 27V one could possibly be the one driving the tuner and the other would be used to feed the LNB with the 13/18 polarity switching via a transistor.

 

[klegg]

The sat boxes in question is the Strong SRT4400 and the TEXAT 9300, I've searched for schematics for this and no luck