Chapter 6 – Maintenance
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13841 Rev A
215
Alternate Replacement Procedure - If, for any reason, the
user finds the previous procedures awkward or difficult, the user
may use the following EPROM chip replacement procedure:
1. Remove the battery end plate (15), as explained in the
previous set of procedures (steps 1 through 4).
2. Remove the two nuts holding the serial connector to the
connector end plate (4).
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 a 4-40
semitaper tap and a longer 4-40 screw
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