Routine Servicing
Vibrex 2000 and Vibrex 2000 Plus User Guide 129
3. Remove the EPROM chip (U20) from the EPROM socket in the main
PCB by gently prying it up, first at one end then the other until the
EPROM is clear of the socket.
4. Insert the new EPROM chip into the EPROM socket so the index
notch in the chip aligns with the notch printed for “U20” on the main
PCB (14).
CAUTION: Take care not to bend the pins on the EPROM when
pushing the chip in.
5. Make sure the EPROM chip pins align with the EPROM connector
sockets before pressing the chip into the socket.
6. Reassemble the Vibrex unit in the reverse order of disassembly.
7. Switch the unit on and verify a successful power-up operation.
6.3.3 Panel Retention Screws
The connector and battery end plates are both held in place on the Vibrex
unit chassis with four 4-40 black, anodized stainless steel screws (03). If
the screws are cross-threaded or stripped for any reason, the user may fix
the chassis by either
• Threading the damaged hole to a deeper depth, using an 4-40
semitaper tap and a longer 4-40 screw
• Using a longer, self-tapping 4-40 screw
6.3.4 Cleaning
This section explains basic housekeeping-type operations the user needs
to perform with the Vibrex unit.
Before cleaning, disassemble the unit in the same way as the user would
for EPROM replacement (see Section 6.3.2.3 “Replacement Procedures”
on page 127).
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