Termination Load Jumper (J1)
Vertical Interval Sync boards are shipped with the termination load jumper (J1)
set to the “off” position (covering jumper pin number 1) for high impedance. If
the house sync generator does not have a termination load of 75 ohms, the J1
jumper
must
be set to the “on” position (covering both jumper pins) to internally
set a 75 ohm load. See Figure 17 for the jumper location on Epica Vertical
Interval Sync boards.
To set the termination load jumper:
1. If the VI Sync board is already installed, remove it from the enclosure (see
Steps 1 and 2 of the installation procedure below).
2. Set the J1 jumper according to Figure 17.
3. Replace (install) the board (see Steps 3 through 5 on page A-3).
Removing & Installing a VI Sync Board
ESD Warning
: To avoid ESD (Electrostatic Discharge) damage to sensitive
components, make sure you are properly grounded before touching any internal
Epica materials.
If you need to set the termination load jumper or need to upgrade a system by
installing a VI Sync board, use the following board removal and installation
procedures for Epica-128 and Epica-256 enclosures.
To install a VI Sync board:
1. Make sure the enclosure(s) is turned off.
2. Loosen captive screws and remove the VI Sync board (or faceplate, if you
are installing a new board) from the expansion slot on the rear of the
enclosure.
A-2
Epica-128 & Epica-256 Installation & Setup
Enabling Vertical Interval Sync
Vert
ical
Int
e
rval
Sync
Figure 17: Epica termination load jumper (J1) positions
Off – High impedance
On – 75 ohm load
J1 Jumper
