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HP 27130A
Additionally, when installing or removing EPROMs, guard against bending or breaking the pins on
the component. These pins also can become folded between the component and its socket, which
would result in intermittent operation of the MUX. In most cases, a bent or damaged pin can be
straightened with careful use of needle-nose pliers.
JUMPERS
There are two jumpers on the MUX card: a Memory Configuration jumper, and a Signature Analysis
jumper. The locations of these two jumpers are shown on figure 2-1.
Memory Configuration Jumper
The Memory Configuration jumper, WI, is an internally-connected, IS-pin dual in-line package (DIP)
shunt network. The jumper is used to configure the two memory sockets (U64 and U74) to ac-
comodate different kinds of EPROMs and static RAMs. The pin diagram of WI is shown in figure
2-2, pin functions are listed in table 2-1.
18
17
18
15
14
13
12
11
10
2 3 4
5 6 7
8
9
Figure 2-2. Memory Configuration Jumper
Signature Analysis Jumper
The Signature Analysis jumper, U34, is a I4-pin pre-programmed shunt network. The internal con-
nections of this jumper are set at the factory and are shown in figure 2-3 for information only.
2-3
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