ARCHIMEDES A410/1 COMPUTER - CITIZEN FLOPPY DISC DRIVE. MODIFICATION WHEN FITTING SECOND FLOPPY DISC DRIVE. DEALER UPGRADE. A problem has been identified when a second Floppy Disc Drive upgrade is fitted to within the Archimedes 410/1 computer. The problem manifests itself by showing both disc drive LED's being lit when either of the disc drives is accessed. A Field Change Order has been authorised by Acorn to effect the replacement of the original drive within the computer. Details of how to detect the problem and the means of rectifying this problem are given below. Replacement Instructions. 1. Remove the unit from the packaging and set aside the packaging for re-use following the repair. 2. Remove the upper case by unscrewing the 5 fixing screws, 3 are located at the rear and 1 on each side. Slide the upper case towards the rear of the computer. 3. Gently disconnect the data cable and the power cable from the drive. Note the orientation of these cables before they are removed. 4. Unscrew and remove the 2 fixing screws which secure the floppy drive bracket to the saddle. 5. Carefully slide the disc drive bracket and the floppy drive assembly towards the rear of the unit. Turn the drive over to check if component number R61 is fitted. This device is located adjacent to the MOD rev box. If R61 is fitted, proceed to No.6. If not, refit the drive and leads - no further action is required. Therefore, proceed with the fitting of the Second Floppy Disc Upgrade as described in the fitting instructions supplied with the upgrade kit. 6. Remove the disc drive from the bracket by removing the 4 fixing screws - retain these for later use. 7. Fit the new disc drive into the bracket - refit the 4 fixing screws. NOTE - the new drive can be identified by checking that R61 is NOT fitted. 8. Gently slide the bracket and disc drive assembly back into the front plastic moulding ensuring that the disc drive bezel is flush or within 0.5mm of the front face. 9. Refit the data cable and power cable (check orientation). Carry out the second Floppy Disc Upgrade as per the instructions supplied with the kit. 10. Slide on the upper case and refit the 5 fixing screws. Submit the unit for testing. 11. Configure the drives as per the instructions supplied with Floppy Drive Upgrade Kit, AKD 51. Ensure that the drive select switch on the disc drive is set correctly. 12. Test the disc drives by powering up the unit, and using a formatted and verified disc, carry out following sequence:- i) Catalogue Drive 0: Check drive 0 LED is on only. ii) Catalogue Drive 1: Check drive 1 LED is on only. 13. The original disc drive should be be suitably packed and returned to the Acorn Spares and Warranty Department, Fulbourn Road, Cherry Hinton, Cambridge, with a fully completed Service Report. A replacement unit will be sent to you to replenish your stock. Distributor dealers should return the exchanged drive to their distributor for action - not to Acorn direct. NOTE: This modification is to overcome a fault when the Second Floppy Disc Drive is added to the Archimedes A410/1 computer. If R61 is fitted to either drive then both drive select LED's will illuminate regardless of which drive is accessed. This modification applies to Archimedes 410/1 computers with a second drive fitted. Single floppy drive machines do not require modification. All AKD51 upgrade kits should contain Citizen drives which are correct, i.e. R61 is not fitted. It should be noted that both drives to be used must have R61 removed. * Before fitting a new drive check that R61 is not present. When completing the Service Report, please ensure that the full serial number of the host computer AND the Second Drive Upgrade Kit is quoted accordingly. Failure to do so will result in the Service Report being returned without action. Please note: R61 is mounted upon the disc drive PCB by means of surface mount technology. NO attempt should be made to remove this component. Any unauthorised rework of this drive will invalidate the warranty of the modified item.