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Chapter 4 - Component Installation
Chapter 4 - Component Installation
R R
EASSEMBLING THE
EASSEMBLING THE
• •
the video input cable
the video input cable
the horizontal and vertical oscillator/drive sections
the horizontal and vertical oscillator/drive sections
• •
the degaussing coil wiring
the degaussing coil wiring
• •
Obviously, it may not be possible to avoid all these areas simultaneously. Watch
Obviously, it may not be possible to avoid all these areas simultaneously. Watch
carefully for false touch reports generated by the controller, or other intermittent
carefully for false touch reports generated by the controller, or other intermittent
operation, especially when very high resolution video images are being displayed.
operation, especially when very high resolution video images are being displayed.
Higher resolution video has a greater bandwidth, and can increase the possibility
Higher resolution video has a greater bandwidth, and can increase the possibility
of interference with the touchscreen system. See
of interference with the touchscreen system. See
page 53. Once acceptable cable positioning is determined, tie the cable down to
page 53. Once acceptable cable positioning is determined, tie the cable down to
avoid movement during shipment.
avoid movement during shipment.
In addition to careful cable routing, other EMI suppression techniques may be
In addition to careful cable routing, other EMI suppression techniques may be
necessary to satisfy agency approval requirements. Use ferrite beads or other radio
necessary to satisfy agency approval requirements. Use ferrite beads or other radio
frequency (RF) suppression elements, additional shielding, and different
frequency (RF) suppression elements, additional shielding, and different
grounding techniques as needed.
grounding techniques as needed.
D D
ISPLAY
ISPLAY
With the touchscreen mounted, and the cable routing and exterior interface
With the touchscreen mounted, and the cable routing and exterior interface
determined, the display must be reassembled. Reassembly is generally in reverse
determined, the display must be reassembled. Reassembly is generally in reverse
order of disassembly. Beware of potential clearance problems between the bell of
order of disassembly. Beware of potential clearance problems between the bell of
the CRT and the electronics chassis, as shorts in this area can produce catastrophic
the CRT and the electronics chassis, as shorts in this area can produce catastrophic
failures of the display. Also, if the inside surface of the back case is painted with a
failures of the display. Also, if the inside surface of the back case is painted with a
conductive coating, watch for shorts between the CRT circuit board and the rear
conductive coating, watch for shorts between the CRT circuit board and the rear
of the back case, as these can also produce disastrous results.
of the back case, as these can also produce disastrous results.
When the electronics chassis is reinstalled, the CRT circuit board is usually
When the electronics chassis is reinstalled, the CRT circuit board is usually
carried along with it. It is often advisable to have a second person assist you, to
carried along with it. It is often advisable to have a second person assist you, to
insure that this circuit board and various other cables do not interfere with the
insure that this circuit board and various other cables do not interfere with the
yoke or neck of the CRT.
yoke or neck of the CRT.
caution are strongly advised for all participants.
caution are strongly advised for all participants.
Reconnect all cables that were removed during the disassembly procedure. Watch
Reconnect all cables that were removed during the disassembly procedure. Watch
for single ground connections from the CRT mount to the chassis, between
for single ground connections from the CRT mount to the chassis, between
individual chassis members, etc., which may have lugs and screws to connect
individual chassis members, etc., which may have lugs and screws to connect
them, or sometimes individual push-on solderless connectors.
them, or sometimes individual push-on solderless connectors.
reconnect these important cables may result in improper performance of the
reconnect these important cables may result in improper performance of the
display after reassembly and may render the unit unsafe.
display after reassembly and may render the unit unsafe.
Hardware Troubles
Hardwar
Safety glasses, gloves, heavy protective clothing, and
Safety glasses, gloves, heavy protective clothing, and
, ,
e Troubleshooting
hooting
Failure to
Failure to
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Troubleshooting
