Table of Contents
Advertisement
J1
10J
TEST Comec:tor
P1
CACHE
Chip
U1309
lo~
TEST Comector
P2
o
~----
A bank of 4 LEOs is located
SW2
r
I
CPU
Chip
U1609
Firmware
EPROM
XU1913
o
on the lower side of the
board, directly below the
upper bank of 8 LEOs.
Time-of-Day
Clock
XU1910
Pin 1
Figure 3-2. A990 CPU Card Chip Location Diagram
Backplane
Removal
Remove the backplane as follows:
1.
Set the power switch to OFF and disconnect the power cord. If battery backup is installed,
set the Battery Enable switch to DISABLE.
2.
Disengage all plug-in cards from the backplane.
3.
Remove the fan panel and power supply, as described previously.
4.
Remove the connectors on the right-hand (primary) side of the line filter.
5.
Loosen the battery assembly screws and remove the battery assembly.
3-14
Service
Advertisement
Table of Contents
