Thanks to Bob in the other topic I've opened ( MG adjustment on KLM-367a Clone topic )
In fact I've discovered that the D/A has not been done well. All the pots that are from 0 to 10 do not make any changes after the 5 middle position. I think the D/A adjustment is half done; This is certainly why i am not able to get a 50Hz LFO when doing MG adjustment.
When i discover the dac error on the clone board ( on the clone board IC33 DAC has a link between pin 1 and 2, these link is not present on the original board ), I've replaced a few components that have been damaged, I've replaced IC33, IC27 and now IC6. D/A adjustment is better but not complete. Like if only half of the pot course is working. This is certainly why i am not able to get a 50Hz LFO when doing MG adjustment.
Where should i look if the D/A adjustment is made at half ?
With a normal D/A adjustment, what signal should i get on IC6 Pins 1,2,3 ?
What other component may have been destroyed with the IC33 pins 1 and 2 short?
Thanks a lot for the help, it help me a lot.