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4-8
Service Information
13.
Install user installed cables on relay #1.
14.
If changing from a 4-pole relay to a 6-pole relay, make sure to configure the number of
poles using the appropriate CONFigure command (see the ROUTe subsystem in
Section 3).
Circuit board removal
Perform the following steps to disassemble the Model 7999-6 to gain access to parts on the
circuit board:
WARNING
1.
Disconnect all power sources and remove the Model 7999-6 from the instrument rack.
Remove the four pan head screws (#6-32 × 5/16) located in the corners of the bottom
2.
plate (7999-6-304). (See Figure 4-2.)
3.
Lower the bottom plate (7999-6-304) away from the relay enclosure (7999-6-301). Two
ribbon cable assemblies (CA-239-2) will tether the relays to the digital board assembly
(7999-6-100).
4.
Disconnect the ribbon cable assemblies (CA-239-2) from the relays (4-pole: RL-252-1
or 6-pole: RL-252-2).
5.
Remove the four kepnuts (#6-32) located in the corners on the back of the front panel
(7999-6-302).
6.
Separate the relay enclosure (7999-6-301) from the front panel (7999-6-302).
Remove the flat head screw (6-32 × 5/16) from the back of the relay enclosure
7.
(7999-6-301). This screw secures the digital board assembly (7999-6-100) to the relay
enclosure (7999-6-301).
8.
Remove the power connector and GPIB connector nuts from the rear panel of the relay
enclosure (7999-6-301).
9.
Slide the digital board assembly (7999-6-100) out from the relay enclosure
(7999-6-301).
To assemble the Model 7999-6, reverse the disassembly instructions. Make sure all parts are
properly seated and secured, and that all connections are made properly.
GPIB address
On the main circuit board, there are five GPIB address DIP switches.To change the GPIB
address of the relay, use the following procedure:
WARNING
1.
Disconnect all power sources and remove the Model 7999-6 from the instrument rack.
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Before removing the relay enclosure, disconnect all power sources and
remove the unit from the instrument rack.
Before removing the relay enclosure, disconnect all power sources and
remove the unit from the instrument rack.
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