3.2 REAR CARD CONFIGURATION
The rear interface card for the Model 2020RC is equipped with two
female UD-26 connectors: one for each port. This card has one
configuration jumper (JB4). Figure 2 (below) shows the location of this
jumper on the PC board.
As Figure 3 (below) shows, jumper JB4 has two possible
positions: strap covering posts 1 & 2, or strap covering posts 2 & 3.
The orientation of the jumper with respect to pin positions is shown in
Figure 4
(above).
SGND & FRGND (JB4)
In the connected position, this jumper links UD-26 pin 7 (Signal
Ground) and frame ground. In the open position, pin 1 is “lifted” from
frame ground.
JB4
Position 1&2 = SGND (UD-26 pin 7)
and FRGND Connected
5
Figure 2.
Rear card jumper location
JB4
(peg 1 toward
bottom of card,
peg 3 toward top
of card)
Figure 3.
Possible function card strap positions
Position 2&3 = SGND (UD-26 pin 7)
and FRGND Not Connected
6
Figure 4.
Model 1000R16P Rack Chassis with Power Supply
WARNING!
There are no user-serviceable parts in the
power supply section of the Model 2020RC. Voltage
setting changes and fuse replacement should only be
performed by qualified service personnel. Contact Patton
Electronics Technical support at (301)975-1007 for more
information.
