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Chapter 6 – Maintenance
4. Pull the shield (02) away from the Vibrex unit chassis
5. Gently remove the ribbon cable (for the keyboard) from
1. CAUTION: Pull on the connectors
6. Remove the four 4-40 screws (03) from the connector
2. NOTE: These screws do not hold connectors on the
7. Pull the connector end plate away from the chassis,
8. Locate the EPROM chip (U20) on the top side of the
9. Remove the EPROM chip from the EPROM socket in
10. Insert the new EPROM chip into the EPROM socket so
CAUTION: Take care not to bend the pins on the EPROM
when pushing the chip into place.
11. Make sure the EPROM chip pins align with the EPROM
12. Reassemble the Vibrex unit in the reverse order of
13. Switch the unit on and verify a successful power-up
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enough to gain access to the ribbon cable that connects
the main PCB (14) to the keypad (part of the chassis).
its connector on the main PCB.
only, not on the ribbon cable.
end plate (04).
connector end plate.
using care that the shield (02) follows the main PCB (14)
without catching on anything.
main PCB (same side as the LCD screen).
the main PCB (14) by gently prying it up, first at one end
then the other until the EPROM is clear of the socket.
the index notch in the chip aligns with the notch printed
for "U20" on the main PCB.
connector sockets before pressing the chip into the
socket.
disassembly.
operation.
13841 Rev A
214
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