FCO Number : E008 ---------- Date of Issue : 1st December 1987 ------------- Applicable Product : A305 (AKB10), A310 (AKB15) ------------------ Description of Problem ---------------------- Excessive background noise from speaker. Types Affected -------------- A305 - before serial number 1001277 A310 - before serial number 1001752 Description of Change --------------------- See attached sheet. 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 --------------------- FCO E008 FCO Credit Rate --------------- £7.50 Special Instructions -------------------- See attched Sheet. Sheet 2 ------- FCO E008 Fix to cure Excessive Background Noise Later boards have a modification to reduce hum from the internal loudspeaker cuased by acoustic pick up. The modification comprises a 10V or higher 100 mF capacitor fitted between pins 7 (+ve) abd 4 (-ve) of IC68. The capacitor should be fitted as close as possible to the IC and should be secured to the PCB using glue or hot wax. RS part numbers 104-449 or 103-957 are suitable capacitor. Machines in the original serial number range 27-AKB10-1000001 to 27-AKB10-1001277 and 27-AKB15-1000001 to 27=AKB15-1001752 were not fitted with this modification in production. However, machines outside this range may, on subsequent repair, have been fitted with circuit boards which are not modified.