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LClock XO3
XA50 Bypass

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L C Audio Technology
H.C. Andersensvej 56
8230 Aabyhoej

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or Gert Frederiksen
+45 6062 9017

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    Complete LClock XO 2 and ZAPfilter 2 Upgrade of the SONY XA 50 ES

    Click on the pictures to enlarge.


    Start by removing the top plate and the two side panels.


    Free out this circuit board, as it is here both the LClock XO 2 and the ZAPfilter are going to get connected. Free the board by removing the 8 copper color screws holding it down.


    Gently flip the circuit board out, so you can access the bottom side. Remove the Crystal Unit X 602 and the two capacitors C611 and C612. Then remove the small SMD 8 pin IC 604. Short pin 6 and 7 on this IC footprint as shown.


    Connect the Clock signal wires from LClock XO 2 in the holes from C612 as shown here. Also connect the 12V power wire to IC 605.


    Here is a better view of where the three wires from LClock XO 2 are to be connected on the main PCB. By now the LClock is mounted correctly, and ready to function. However wait until you have mounted the ZAPfilter as well, before you fasten the LClock to the side panels.


    Remove R501 - R504


    ...And R401 - R404


    Connect a RED wire to the hole from R503, and a BLACK wire to the hole of R502, in both cases the hole closest to the CD player front panel. The connect a BLUE wire to C533 in the background of the photo, use the terminal closest to the back panel (Ground). Same procedure on the other side of the circuit board at R402, R403 and C433. Leave some 10-12 cm / 4-5 inches of wire free.


    Remove R534


    ...and R434.


    Replace R534 with a 3k01


    ...and the same with R434


    Connect the ZAPfilter 2 input terminals to the total 6 wires, you have just mounted to the main board RED to + input, BLACK to - input, and BLUE to Input GND. Same for both channels.


    Free out this Mains Grid board. CAUTION! Remove wall plug before this operation. Full Mains voltage is present on this board no matter the state of the power switch. You may have an electrical chock if power cord is plugged into the wall.


    Solder a 20 cm / 8 inch piece of normal mains wire to the shown terminals on the PC board. Remember to fit blue and brown correctly as shown.


    The mains board is again fastened in the chassis. Now secure the other end of the 20 cm / 8 inch mains wire to the ZAP filter mains input. Remember to mount blue and brown correctly. Fit the grey flat cable in the 10p plug on both power supply and ZAPfilter. Check for physical interference with the CD transport.


    We have fastened the ZAPfilter mains transformer with a rubber moulding gel, and secured the power supply board with the supplied screws to the side panels. In the same way we have secured the LClock XO 2 to the other side panel, using the supplied screws.


    All the wires are assembled with strips, and make sure that everything looks nice, and no wire is trapped in the CD transport or any other place.


    Short the setup bubbles 1, 3, 4, 5 and 7. (Current DAC). Better do this in both channels of the ZAPfilter.


    In this case we have mounted a set of XLR male plugs for balanced output on the XA 50. Then we have relayed gnd and + from the XLR plugs to the phono plugs, so both outputs work properly. You can also just hook the Output GND and + outputs directly to the existing phono plugs, to run unbalanced. Do NOT re-mount the blue and red mini-plug in this circuit board after installation of ZAPfilter! Since the old analog stage is no longer active, the variable output of the player will not work.
    Now the upgrade work is complete, and the player ready to operate. You might want to check with a voltmeter if any significant DC comes out of your audio plugs, before hooking up to your stereo system. Break in of the circuits takes 1-2 weeks.

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