Manual tuning of Westamp servo amp

Setting up a Westamp board

Set the following pots out the circuit. Don’t have anything connected to the servo cards. The resistance readings are to be within 10%-20% and set in respect to common test points.

1, Locate R2 on drawing AUX POT no adjustment needed

2, Locate R12, TAC POT normally it is sealed, check and set for 6.65 K ohm. Find R13 and connect your meter lead to the right side as shown on diagram. This is the second resistor down in the center band of resistors between pots, turn the pot until you reach 6.65 K ohms.

3, Locate R15, TC POT, Set for 1.25 K ohm from the right side of C7 top capacitor in between the pots.

4, Locate R28, CKM POT. This pot should be turned fully clockwise. Set for 2.5 K ohm from right side of R29. This is the top resistor under the hole located in the lower left side of the AUX POT.

5, Locate R23, BAL POT, Caution move your meter lead off to the common and on to the J3-1 pin (-15 V.D.C.) set the pot for 6.4 K ohm from the right side of R22, it is the second resistor below the balance pot.

6, Locate R5 SIG POT, Caution this must be set only when the servo card is back on the circuit. Set for 5.4 K ohm from the left side or R6. This is the third resistor below the SIG POT.

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