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Acorn computer A3000 Servicing
Also see for A3000: Welcome guide
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Module Level ServicingModule level servicing involves fixing computers by swapping modules (PCBs, PSUs, etc.)rather than replacing defective components. This has a number of benefits for thetechnician:The fault-finding process is very much simpler and quicker than at componentlevel. The Archimedes machine, for instance, consists of seven modules, asopposed to several hundred components.The equipment required to service the machine is much simpler and cheaper.There is no need to have an oscilloscope; for most jobs, a screwdriver and avoltmeter are all that is required.Tumround time can be significantly reduced. Keeping several hundred sparesin stock (as may be required for component level servicing) is usuallyimpractical and hence spares must be ordered for each machine which is to befixed. It is much more practical to keep a stock of modules, meaning thatmachines can be turned around very much faster.For some items, the cost of a new unit is sufficiently low compared to the cost of repairingthe unit that a defective part is simply thrown away. For others, such as an ArchimedesPCB with a cost (at the time of writing) of around £420, the defective part is worth repairing.Acorn has a system of 'central repair' for such items, which takes in defective parts andreturns recoditioned ones.For a complete treatment of procedures and conditions for servicing machines, refer to theforthcoming Acorn document which will cover these issues (due in Feb. 91.) |
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