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  1. I

    Some question about Mark IV's schematic

    Thank you Boogiebabies! I understand the swithing matrix circuit presumedly, but not sure :( And I know there is dual cell LDR, one LED control two LDR, so since LDR11 is independent from LDR11x, if it is a dual cell LDR or two individual is nonsignificant. I need a help, some clear inside...
  2. I

    Some question about Mark IV's schematic

    Thank you very much!!!!! I got the whole schematic(including the power supply, the switching busses and the foot switch) and study it for a while. I don't understand "the second side of the trace" that you said, is there some more schematic about Mark IV? I list the LDRs and Relays turn on in...
  3. I

    Some question about Mark IV's schematic

    Ohh, why can't upload a graph. When in R1 R2 mode, both the LDR10 and the LDR8 are opened, if the LDR11 or LDR12 putting to earth is necessary? Because the LDRs isn’t reslly opened, but indeed a large velue resistor? When R2 mode, the RY1 is closed, if the LDR11xx is necessary? Both close? If...
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