Mesa Boogie Road King II loop problem

[sorin65]

hello world! suddenly my Road King has very low output when Loop System is engaged. when is bypassed frrom the rear panel switch ( master and solo pots disengaged) it works.
the V5 12ax7 is ok. I cleaned all the send / return jacks, I verified also the send potentiometer. all seems ok. I put a cable from the send output in the input of another amp - the signal is very weak.
I dont find the schematic for this amp.
does anyone had same problem? any ideas for restoring the amp back to life?
thank you very much!

[Gregg]

Sounds like the tube or some of those FETs is the problem so try another tube first. The schematic is somewhere around.

[sorin65]

hi Gregg, I tried some others tubes in V5. voltages seems ok on the tube. probably fets are the problem, but without schematic I cant go further...

[g1]

Try here: http://milas.spb.ru/~kmg/files/schem...0King%20II.pdf

[sorin65]

thanks G1 for schematic.

[sorin65]

thanks for the support!
I repaired - both J175 fets for send and return in Loop1, damaged.