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Chapter 4: Troubleshooting
To check the keyboard; Trouble Isolation Procedure
To check the keyboard; Trouble Isolation Procedure
Use this procedure only if you encounter key failures in the keyboard self test procedure. If any
knobs fail, replace the keyboard assembly.
Disconnect the power cord and remove the cover.
1
Remove the front panel assembly.
2
See chapter 6 for instructions.
Remove the keyboard assembly from the front panel assembly. Partially re-assemble
3
the front panel assembly, including the flat-panel display and lens, but omitting the
keyboard. Re-attach the partial assembly to the chassis.
Be sure to reconnect the display video cable and the backlight inverter cables. See chapter 6
for instructions on removing and disassembling the front panel.
Separate the elastomeric keypads from the keyboard assembly.
4
C A U T I O N
CONTAMINATION CAN CAUSE INTERMITTENT OPERATION!
Be careful not to contaminate the key side of the PC board or the keypads. Dust and fingerprints
on these parts may cause intermittent key operation.
Set the keyboard assembly on an antistatic electrical insulated surface.
5
Connect the keyboard cable to the scope interface board in the chassis.
6
You may need to set the chassis on its side to allow proper routing of the cables without straining
them.
Reconnect the power cable and apply power.
7
Enable the graphical interface, then start the keyboard test as described in the Primary
8
Trouble Isolation section of this chapter.
Carefully short the PC board trace, with a paper clip or screwdriver, at each
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nonoperating key (as determined by keyboard test), and look for an appropriate
response on the display.
• If the display responds as though a key were pressed, replace the elastomeric keypad.
• If the display does not respond as though a key were pressed, replace the keyboard.
Re-assemble the oscilloscope.
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