EC-2 96kHz A/D/D/A upgrade • appendix A
A-4 EC-2 Manual
Prepare to install:1. Disconnect the HD24’s AC power cable, and
make sure you are working on a clean, flat, hard
surface. Ground yourself by touching a
grounded metal object. An anti-static
workstation with anti-static mat and wrist
strap is highly recommended.
Hazardous voltages are present within the
chassis. Do not remove the top panel without
first unplugging the unit from AC power!
2. Remove the cover from the HD24: The cover is
held to the body with 5 Philips head screws on
the rear, 2 on each side, and one on the top.
Slide the cover directly towards the rear; don’t
lift it up—there are metal tabs on the back panel
and along the bottom that will get bent if you
do.
Remove the existing converter PCBsand cables:3. Locate the existing DC power cable. This cable
has several thick red, orange, yellow, black, and
blue wires bundled together. Pinch the tab lock
holding the white connector to the back of Drive
1 and carefully disconnect it. Do the same for
the connector on Drive 2, the Main PCB (the
printed circuit board on the floor of the HD24),
and finally the power supply itself. (This will be
replaced with a new cable in step 14.)
4. Disconnect the 26-pin flexible ribbon cables
from the existing converter PCBs and the main
PCB, and remove them completely.
New 26-pin cables are attached to the EC-2
daughterboard—the old ones will not be used.
5. Remove the 24 nuts and washers on the 1/4”
input connectors, holding the PCB in place to
keep it from falling. Then remove the old A/D
PCB (the highest one on the back panel).
6. Do the same for the 24 nuts and washers on the
1/4” output connectors. Hold the PCB in place
to prevent the D/A PCB from dropping onto
the main PCB. Once the PCBs are removed, put
the nuts and washers back on the jacks and store
these PCBs and cables in the packaging that the EC-
2 came in.
HD24 interior with original A/D/A PCBsDC power cable
(
remove
)
26-pin ribbon
cables
(
remove
)
Drive 1 Drive 2
A
/D PCB
D/A PCB
Main PCB
Power
supply