Acorn FileStore E01, Руководство по обслуживанию

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Chapter 5 E01S Fault finding
FileStore Service Manual 77
5. E01S Fault finding
The following chapter describes the suggested methods of fault finding on a Stacking
FileStore E01 unit when the fault is not clearly in a specific area.
When the E01S unit is powered up, the following sequence of operations, should take place,
as indicated by various activity indicators on the FileStore:
(1)
On initial power up, the power indicator and mode/activity indicator should light up.
(2) The disc drive activity light for any connected Stacking FileStore units will flicker in
turn.
(3) The floppy disc drive indicator for the FileStore E01S will light up.
(4) All indicator lights should then extinguish, except the power indicator lights, for all
connected FileStore units. The FileStore E01S is now ready for use.
If the power on routine fails, then the FileStore is faulty. Follow the fault finding procedures
outlined below. These should help you to discover any basic fault with the FileStore.
The E01S unit consists of three major components:

the pcb

two floppy disc drives

the switch-mode power supply.
5.1 Power supply
The E01 power unit is powered by a switch mode power supply. The power supply has two
outputs. The 5V power supply cables are colour-coded as follows:
Black ground
Red +5V
The power supply can be tested by measuring the +5V voltage between the black and red
cables. The allowable voltage ranges are as follows:
+5V (black and red) 5.0V to 5.25V
The measurements should be made with all connectors in place.
Next, measure the current drawn by the pcb from the +5V supply. The current measurement
should be made in series with the red cable. The connections to the meter to do this must be
made with the power switch off. The measurements must be made after power-up as some of
the circuitry when working correctly, will alter its current consumption with time. Also
ensure that:

the Econet module is fitted

the SCSI interface is disconnected from other devices, but still have the SCSI terminator
fitted

The front flap should be closed.