F1 Service Manual

[jmotzi]

Sorry for reviving the old post, but I have a question and it seems best here.

Regarding the F1 Service Manual currently posted on the Firstwatt site: http://www.firstwatt.com/pdf/prod_f1_srv.pdf

The text states the PSU-R9 & PSU-R10 are bleeders; The PCB on page 11 shows that these resistors span the output V+ and GND as expected, whereas the schematic on page 9 shows these resistors on the input side before C3, C1; Which is correct?

Thanks!

JM

 

[Nelson Pass]

It does not matter, but they are on the "channel side" of the RC
filter networks.

 

[Zen Mod]

look again ........ their position ( parallel to first or second C cell in CRC ) is practically the same

edit: he's again faster and smarter than Mighty Moi

 

[wdecho]

I have noticed in the new FW designs the bleeders are omitted. The circuits drain the caps down on shutoff. When testing just the PS section on a new build one better remember to drain those caps though.

 

[jmotzi]

Thanks for the lightning fast reply!

In order to get KiCad to put the bleeders on the "channel" V+ copper plane, I need to draw those resistors in parallel with the last two caps in the CRC (the "channel" side).