AC-201 CONNECTING BOTH MIC INPUTS TO TAPE OUT

           REMOVING THE AMPLIFIER FROM THE CASE

Remove the cover from the unit, lift out the turntable platter and set it aside. Remove the 1 inch plastic reset access cover from the right side of the case. Turn the unit upside down onto a pillow, foam or other material, be sure it is thick enough to support the amplifier and protect the tone arm. Remove the four screws, one near each spring foot. AT THIS POINT THE CHASSIS IS FREE FROM THE CASE AND EXTREME CARE SHOULD BE USED TO PREVENT DROPPING EITHER THE CASE OR CHASSIS. Holding the chassis and the case together, carefully turn the entire unit over to its upright position. The chassis can now be lifted out of its case, lifting the front first so as to clear the jacks on the rear panel.

               INSPECTION AND FAMILIARIZATION

Turn the unit upside down on the padding with the controls toward you. The main circuit board is on the right hand side, note how the wires connected to the board are routed. There are two slotted screws holding the left side of the main board in place. On the right side of the chassis there are 4 slotted screws holding the heat sink in place.

              HINGING THE MAIN BOARD OUT FOR SERVICE

1. Remove the two slotted screws on the right side of the chassis closest to the top deck.

2. Remove the two slotted screws on the left side of the main board.

3. Tip the board slightly upward from the left end and unplug the multi-colored cable and the small plug next to it.

4. Place the 201 on it's side, with the heat sink down. Hinge the board down un-tucking the remaining cables as needed.

MODIFYING

5. Check the values of the following resistors and replace if needed.

            R42, R36. R34 should be 33 K

            R28 should be 39 K

6. Remove R38 and discard.

7. Tack one end of 100 K resistors to the intersection of:

            R28 and R29 (pin 1 of Z2)

            R34 and R33 (pin 7 of Z2)

            R42 and R43 (pin 14 of Z2)                                                   Page 1 of 2

8. Connect the other end of all 3 resistors to the solder hole furthest from the edge of the board where R38 was connected (pin 10 of Z2)

                      REASSEMBLY

Place the 201 upside down on the pad with the controls toward you. Reconnect the two cables removed in step 3 being carful to properly align the plug so all pins are connected. Tuck the other cables in and replace the 4 screws.

Turn the unit over and test it before putting it back in the case.