Help repairing MXR Micro Chorus M148 SMD version (post 2008)

[x-pro]

R42, R43 Good ?

[rAdAdA]

apparently yes, as the pedal works again now

[bruzanhd]

Not sure if this warrants a new thread, but, would anyone be able to explain what the function of the TR1 and TR2 pots is? All I can figure out is that TR2 makes the effect come on and off depending on where it is in its sweep. I can’t figure out what TR1 does by playing with it.

[Mark Hammer]

The trimmer labelled TR1 appears to be used for maximizing clock rejection by adjusting the balance between the two outputs of the delay chip (pins 7 and 8). The trimmer labelled TR2 would then by used to set the bias voltage required for the input signal to the delay chip to pass.

What is the little 3-pin MOlex connector for? Does that connect to a battery snap?

[bruzanhd]

The trimmer labelled TR1 appears to be used for maximizing clock rejection by adjusting the balance between the two outputs of the delay chip (pins 7 and 8). The trimmer labelled TR2 would then by used to set the bias voltage required for the input signal to the delay chip to pass.

What is the little 3-pin MOlex connector for? Does that connect to a battery snap?

Thank you. Yes the 3 pin connector is for the 9V battery lead snap connector.