Field Change Order: 2018
Date of Issue     : 17th July 1990
Applicable to     : Ethernet 1 - AKA25

Reason for Issue:
Unreliability can be caused when Ethernet 1 is used with other expansion
cards that also use the CLK 8 signal due to loading. Changing IC 18 from a
74 ACT 240 to a 74 AC 240 improves immunity by raising the threshold from
TTL to CMOS levels.

Types Affected:
All units prior to rework (ED 2545).
Manufacturing to inform Customer Services of Serial Numbers.
   
Description of Change:
Remove IC 18 (74 ACT 420) and replace with 74 AC 240 (Acorn approval No.
0750,240).

Claim Procedure:
Following completion of the field change order instructions, service
engineers should fill out a service report clearly stating the serial no. of
the host unit, the FCO no. (above), and claim the FCO credit rate (below)
for labour charges. Any replaced components should be wrapped to ensure safe
carriage and returned with the service report. Acorn will verify the
information and, process the claim for labour charges and issue any
replacement components as necessary.

Rework Doc. Reference:
2018

FCO Credit Rate:
£16.00 (sixteen)

Special Instructions: