Upgrading the Message Memory
seconds of memory to a unit that has the factory-installed
64 seconds of memory), put the two memory chips in U24
and U25 chip sockets.
The following table shows the locations of the memory chips
for each upgrade of 64 seconds of memory.
Memory Upgrade
Chips
Total
Sockets
MESSAGE
Memory
First 64-second upgrade
U24, U25
128 sec
Second 64-second
U26, U27
192 sec
upgrade
Third 64-second upgrade
U28, U29
256 sec
NOTE:
The memory chips for the initial 64 seconds of
message memory that the unit is shipped with from
the factory are located in U22 and U23.
When inserting the additional memory chips, make sure you
observe the position of the notch (or dot) near pin 1 of the
original memory chips (Figure 4-6). Install the additional
chips with their notch (or dot) in the same position.
4-8
