Keithley 7077 Instruction Manual page 40

Service Information
1. Installing or removing the matrix cards from the switch-
ing matrix.
2. Connecting or disconnecting cables from the matrix
card. The pins of the cable connectors are easily acces-
sible, which makes them extremely hazardous to handle
while power is applied.
3. Making internal changes to the card (such as removing
or installing jumpers).
Cable connections to the matrix card make it difficult to
install or remove the card from the switching matrix.
Therefore, it is advisable to install the card and then
make the cable connections. Cables should also be dis-
connected before removing the card from the switching
matrix.
Referring to Figure 4-1, perform the following procedure to
install the Model 7077 Matrix Card in the Model 707 or 708
Switching Matrices.
CAUTION
Contamination will degrade the perfor-
mance of the matrix card. To avoid con-
tamination, always grasp the card by
the handle and side edges. Do not touch
the card edge connectors, board surfac-
es, or components. Do not touch areas
adjacent to the electrical contacts on the
connectors.
Card installation
WARNING
Turn off system power before installing
or removing matrix cards.
1. Turn the switching matrix off.
2. Select a slot in the switching matrix and remove cover
plate and mounting screws (Figure 4-1).
3. Install the Matrix Card.
4-2
WARNING
Both spring loaded panel fasteners must
be secured to ensure a proper chassis
ground connection between the matrix
card and the switching matrix. Failure
to properly secure this ground connec-
tion may result in personal injury or
death due to electric shock.
Model 707 — With the relay side of the matrix card fac-
ing the fan and the card's top and bottom edges seated in
the switching matrix card edge guides, feed the card
completely into the switching matrix (Figure 4-1, View
A). Secure the matrix card in the switching matrix by
tightening both spring loaded mounting screws.
Model 708 — With the relay side of the matrix card fac-
ing upwards and the card's top and bottom edges seated
in the switching matrix card edge guides, feed the card
completely into the switching matrix (Figure 4-1, View
B). Secure the matrix card in the switching matrix by
tightening both spring loaded mounting screws.
4. Connect cables to the matrix card as required. Refer to
Section 3 for sample applications.
Card removal
WARNING
Turn off all system power before install-
ing or removing matrix cards.
1. Turn the switching matrix(es) off.
2. Remove all cables from the matrix card.
3. Remove the matrix card from the switching matrix by
loosening both spring loaded panel fasteners and sliding
matrix card out of the switching matrix.
4. Install cover plate with mounting screws (Figure 4-1).