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9.
Reinstall the cover removed in step 2.
10. Record the new slot assignment on the configuration chart affixed to the chassis.
2.4.3.2 Reconfigurlng Access Granted Circuit for New Chassis Slot (17-Slot Chassis). Continuity of
the TLAG jumpers in the 17-s10t chassis is controlled by two socket-mounted DIP switches, each
with eight individual switch sections. These switches are accessible from the rear of the 17-s10t
chassis, as shown in Figure 2-25. To set or check these switches, the following steps should be
performed.
1. Turn off power and unplug the chassis ac line cord. Allow about 30 seconds for the power
supply bleeders to discharge the power supply capacitors.
WARNING
Opening the chassis rear cover (power panel) exposes high voltages if
the ac line cord is installed in a live socket. Do not contact the large
filter capacitors on the power module.
CAUTION
The wire hinges on the chassis rear cover do not allow the cover to
pivot beyond 90 degrees. Attempts to open the chassis rear cover
beyond 90 degrees may damage the hinge mountings.
2. Using a coin or flat-bladed screwdriver, release each of the 11 quarter-turn latches on the
chassis rear cover. Pull the cover straight back 38 millimeters (1.5 inches) to extend the
wire hinges, and then open the cover to the 9O-degree position. The hinges are on the right
as viewed from the rear of the chassis.
3. Refer to Figure 2-26, which shows the correspondence between switch sections and chassis
slots. Set the appropriate switch segment OFF for any slot which is assigned to a TILINE
master device, such as the disk controller. All other switch segments should be ON.
4. Refer to paragraph 2.4.3.4 if interrupt assignments are to be changed.
CAUTION
There is a possibility of interference between heat sinks in the chassis
and modules mounted inside the rear access cover as the door is
closed. Do not force the door closed if resistance is felt.
5. Rotate the door to a position parallel to the rear of the chassis, with hinges fully extended.
Grasp the rear access cover at the left and right sides and push it straight back to its
mounting position against the chassis.
6. Using a coin or screwdriver, lock the 11 quarter-turn latches which hold the access cover
in position.
7. Record the new slot assignment on the configuration chart affixed to the chassis.
2-34
Digital Systems Division
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