ARCHIMEDES SERIAL PORT MODIFICATION Rework Procedure No Q61-08-002 1 Remove unit from packing - aside packing for re-use - check serial no for re-match. Record serial no and advise Acorn QA Dept/Customer Services Dept. 2 Remove lid by unscrewing 5 fixing, 3 at rear,2 on sides. Slide lid backwards. 3 Check if IC 9 is socketed, if it is remove chip from Socket and replace with new chip type CMD 65C51 date coded 8801 or later. Proceed to instruction 9. 4 If IC 9 is not socketed. Remove PCB Assembley from base by removing 2 fixing which secure rear panel. Disconnect disc drive cables, power leads, speaker and battery leads and carefully slide board out. 5 Remove chip from PCB using an "Electrovert Solderpac" desoldering station or equivalent equipment. Do not try to remove chip with soldering iron and vaccum type equipment as this method gives a high risk of damaging tracks and through plated holes. 6 Fit a 28 pin socket (Acorn part no. 0800,128) in position IC 9. 7 Fit new chip type CMD65C51 date coded 8801 or later into socket IC 9. 8 Refit PCB assembley (if necessary) and reconnect all cables. Secure PCB rear panel. 9 Refit lid and 5 fixings. Check for blemishes/scratches etc. Pass to test. 10 Carry out Acorn Functional Test as detailed in documents: 0076,000/T(A305 & A310) 0077,300/T (A440) and sock unit for 3 hours (ie power up only and periodically check function). NOTE: Reset must be carried out to reconfigure battery back up RAM by holding 'R' key down on power up. Repeat as necessary to configure. FCO 2003