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1-2
Safety Requirements
Required
Tools
Removal and Replacement Procedures
&
Warning This terminal operates on voltages that can be lethal.
Don't attempt to service the terminal without taking the
following precautions:
• Turn the terminal off and disconnect the power cable.
• Remove jewelry from your hands and wrists.
• Avoid wearing clothing made of synthetic fabrics.
• Use insulated or nonconductive tools.
• Handle circuit boards only by their edges.
• Don't reconnect the power cable or turn the terminal on
unnecessarily while the top cover is removed.
• Whenever you connect or disconnect the anode from the
anode lead, make sure to discharge the anode as directed in
"Discharging the Anode."
&
Warning The CRT/yoke assembly has high voltages. Only
qualified service personnel should adjust it.
• If you need to remove or replace the CRT/yoke assembly,
remember that it can implode
if
you drop it or break the neck.
The flying glass can injure anyone within a radius of ten feet.
• Always use the manufacturer's replacement components.
Especially critical components as indicated on the circuit
schematics should not be replaced with any component other
than the manufacturer's. Where a short circuit has occurred.
replace those components that indicate evidence of overheating.
Before removing or replacing any assemblies, make sure you have
the following tools:
• '.'\o. 0 and '.'\o. 2 Phillips screwdrivers
• Insulated flat-blade screwdriver
• Alligator clips
• Digital voltmeter
• Nonscratch mat or surface on which to place the terminal
• Fuse puller or small flat-blade screwdriver
• Nonconductive alignment tool
KEYBOARD MODULE REMOVAL
The terminal keyboard style options are
AND REPLACEMENT
• ASCII
• ANSI
• Enhanced PC
Figure 1-2 identifies each keyboard. Procedures for removing and
replacing the keyboards, keyboard cables, and keyboard PCBs
follow.
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Troubleshooting
