Procedure 3 - Removing And Replacing Access Lid 6B-6 - Control Data Corporation CDC CC63X Hardware Maintenance Manual

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Using the information in Appendix A, verify
that other keys produce the correct code when
pressed and released.
5. Verify the eight indicators are being stepped
on and off by the firmware. Ensure that each
indicator does light.
6. If the terminal has a touchpanel option
installed, verify the cursor moves to the
area touched on the screen. Cursor movement
will check all electrical connections to the
panel.
7. To run external loopback test do the
following:
• Power on equipment connected to parallel
port (either printer and/or disk unit).
Primary disk unit must have disk
installed. (Without disk installed, an
erroneous parallel port fail message will
occur.) If a graphics printer is on the
parallel port, wait approximately 20
seconds after powering it on before
proceeding and make sure its PRINT switch
is lit.
• If the serial port board is installed,
place its loopback switch to the up
position.
• Pullout TEST switch.
The external loopback test are now running.
The screen will display the test name and the
/~
word RUNNING or if an error is found FAIL. /~
Tenninate To exit test 3 press RESET switch. Remember, if
test 3 indicated any errors, use SAM 6 for fault
isolation. Return test switches to normal.
Procedure 3 - Removing and Replacing Access Lid
Remove and replace the access lid from the display terminal as
follows. Refer to figure 6B-4.
6B-6
1. Remove the two screws attaching the lid to the terminal.
2. If the terminal is a CC634-B/CC638-B unit, disconnect the
power cord from rear of terminal and push up the power-
cord interlock latch.
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