Replacement Of Cards - Siemens ST950 Handbook

•
Re-fit cards and re-check operation of controller.
10.2.9 Faults with Handset
If the handset does not operate correctly when plugged into the handset port on
Main CPU Card, do the following:
•
Check that the Handset +5V supply fuse (F1) on the CPU Card is intact.
•
Check that there is a +5V supply on pins 9 and 10 of the handset socket (0V
is on pins 1, 7, 18 and 19). With the handset plugged in check the ripple
voltage on 5V supply.
(This supply powers those handsets that do not have their own supplies.)
To fully investigate, this supply may require the use of an oscilloscope.
•
Switch off controller and withdraw Main CPU Card. Check security of ICs
mounted in sockets of the above card. If no loose ICs are found, replace Main
CPU Card.
•
Replace Main CPU Card and re-check to see if handset now operates
correctly.
10.3

Replacement of Cards

This section covers removal and fitting of PCBs in the ST950. Also described are
procedures to ensure that the card functions correctly when fitted.
10.3.1 Safety Requirements
10.3.2 General Requirements
When replacing cards the original card should be inspected and the following points
checked:
•
Check the connectors on the card. Are any pins bent, broken or damaged in
any way? If there are, make a note of the card and pin number in the
controller visit logbook as the backplane may have been damaged.
•
Check any ICs that are mounted in sockets and ensure they are securely
fitted.
•
A problem with a loose fitting IC or use of an incorrect one can usually be
rectified easily without having to fit a replacement card.
Do not forget to record the replacement in the Controller Visit Logbook.
•
Complete the fault label and return the faulty card for repair.
Security classification
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Copyright © Siemens Mobility Limited 2018. All Rights Reserved.
Before replacing any fuses, cards etc., IT IS ESSENTIAL THAT THE
POWER TO THE CONTROLLER IS ISOLATED. See the Safety
Warning on page 2 for details.
Failure to isolate the supply before changing parts may result in
damage to the controller.
Unrestricted
5
Neil Atkinson
ST950 ICM Handbook
Intelligent Traffic Systems
Sopers Lane, Poole, Dorset, BH17 7ER
Page 90 of 125
Status Issued
Date 18-Dec-2018
Document No. 667/HE/46950/000