Only some mode filter on 4pm

hello community

i have build my second 4pm on i have little problem

only lp3 lp1 hp1 hp2 hp3 notch phaser work

do you have an idea of where the problem here

i have check solder and it’s ok

thank you for your help

i have a bad contact on ic4 thank you ,i don’t understand i’s the third socket with bad contact commanded to Reichelt ;thank you olivier !

oupps i don’t have see


  • IC4 soldering
  • 4053 soldering, particularly near pins 12 and 13
  • C22

where i can find the schematic of filter ?

thank’s olivier

i check all this point

Schematics and PCB section of this page