HagClock Low Jitter Clock Upgrade
4
Installation
First, locate the existing crystal within the CD transport. Make sure it is either a
11.2896M or 16.9344M type, and use the appropriate HagClock. Find a location
within the chassis to mount the clock. Place it as close to the existing crystal as
possible. Use the board itself to mark holes for drilling.
Identify the other existing oscillator components by tracing the layout (the circuit
should be as shown in the schematic below). You may have to do a little Internet
research and download the data sheet for the integrated circuit used. This will
help determine the input and output pins,
RBIAS
,
XTAL
,
CIN
, and
COUT
. Locate
the +/-12V (+/-8V to +/-16V) analog power supplies (they will normally be used
for the opamps in the output stage). The only ground connection will be in the
clock output.
Some transports employ surface mount components. It is easier to remove them
with two soldering irons, one on each side of the component. Save all removed
parts in case you want to restore the transport to its original configuration!
Proceed as follows:
Remove
XTAL
,
CIN
, and
COUT
.
Solder one lead of the 100 ohm resistor to the clock input (top of
CIN
).
Trim twisted pair output leads as short as possible. Solder the
GND
lead
to the bottom of
CIN
, and the
ACLK
lead to the 100 ohm resistor.
Solder the
VCC
wire to +12V, and
VEE
to –12V.
Testing
Apply power; the LED should immediately light up. Using an oscilloscope,
confirm oscillator action by measuring the output. CD transport should function
normally.
