IBM 5291 Maintenance Information page 28

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242
Display Unit
Top Cover'
1.
Power off and remove the line cord from the AC
outlet.
2.
Remove the hex-head screw that secures the
retainer ring to the display unit. (The screw is
located at the bottom center of the retainer ring.)
3.
Remove the retainer ring by pulling the bottom half
toward you.
DANGER
The removal of the top cover leaves the high
voltage anode of the CRT and the high-voltage
circui~s
around the flyback transformer
unprotected. It also leaves the CRT
flnprotected. The CRT may easily be cracked or
broken, especially around the CRT socket. The
CRT will implode if broken or cracked.
)-.
1
Leave the display unit connected to the lower unit when
removing the top cover of the display unit only.
Top Cover
Side View of
Display Unit
240-242
Display Unit
3-9
I
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I
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