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ST950 Plus+ User Manual
ST950 Plus+ User Manual
Page 44 of 176
667/HE/53000/000
Issue 2
Unrestricted
Fuses
There are several user replaceable fuses present on the board that provide protection where
power supplies from the system leave the board to power the users
’
equipment.
Fuse Replacement
When replacing a fuse, it is important to fit the correct type for continued protection of the
ST950 CPU Card and user
’
s equipment
.
F1
–
Handset
–
500mA Quick blow
F2
–
Aux RS232 Modem power supply output
–
500mA Quick blow
The replacement fuse for F1 and F2 is Siemens part number 518/4/97070/004. This part number
calls up the holder and fuse. Remove the fuse and discard the holder.
Heart of the Controller
The heart of the Controller uses an SD card to provide transferable storage for controller firmware,
configurations and logs.
Formatting the SD Card
The formatting of the card is such that it is not readable in a PC. There are no user files
accessible on the card.
Should it need to be removed or replaced the following procedure should be followed:
Power down the controller.
Unplug connectors and slide the CPU card free of the rack so that the top edge of the card can be
accessed.
Push the card into t
he socket slightly until it ‘clicks’ then release pressure. The card can now be
pulled from the socket.
To insert a card, align it with the socket with the contacts facing PCB and closest to the socket.
Slide it into the socket and apply slight pressure un
til it ‘clicks’. The card is now located correctly.
The photos below show the correct orientation for the card.
Note: It is important that the card is not write protected. The ‘lock’ switch must be in the position
shown in the diagram below: