Yamaha CS-50 Servicing Manual page 56

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When the expression pedal is connected, terminals 1, 2, 4 are connected to terminals A, B, C, respectively to
supply -15V to the lamp, LED and the control voltage is output to the EI terminal through the CdS
conductor.
0
-10
-20
-30
-40
Tolerance: ±5dB
dBm
0
10
30 degree
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