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10.2.11 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 cards in the ST950 ELV cabinet. 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 a fault label and return the faulty card for repair.
10.3.3 Access to Cards in ST950 ELV 19" Controller Rack
Most cards in the rack have connectors at their rear edge linked to various parts of
the system. In order to gain access to the rear of the cards, first swing out the
ST950 Rack Assembly. Release this by undoing the two screws at the right hand
Security classification
Unrestricted
Version
7
Last Editor
manpreet.jeerh
Document Name
ST950 ICM Handbook
Copyright © Siemens plc 2020. All Rights Reserved.
All manuals and user guides at all-guides.com
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.
Mobility, Intelligent Traffic Systems
Sopers Lane, Poole, Dorset, BH17 7ER
Page
Status
Date
Document No.
Mobility is a division of Siemens Plc
122 of 154
Issued
January 2020
667/HE/45950/000
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