4 Repair activities, controller IRC5
4.13. Replacement of DDR SDRAM memory on motherboard in computer unit DSQC639
2413HAC021313-001 Revision: K
© Copyright 2004-2008 ABB. All rights reserved.
Removal (old design of the computer unit DSQC 639)
The procedure below details how to remove the DDR SDRAM memory on the motherboard
in the computer unit.
Standard toolkit The contents are defined in section
Standard toolkit
Other tools and procedures may be required.
See references to these procedures in the step-
by-step instructions below.
These procedures include references to
the tools required.
Circuit diagram See Circuit Diagram on page 341
Equipment Note
Action Note/Illustration
1.
DANGER!
Before any work inside the cabinet, please
observe the safety information in section
DANGER - Make sure that the main power
has been switched off! on page 28.
2.
esd
WARNING!
The unit is sensitive to ESD, before handling
the unit please observe the safety
information in section WARNING - The unit is
sensitive to ESD! on page 29
3. Remove the computer unit Detailed in section Replacement of
computer unit DSQC639 on page 226.
4. Remove the five attachment srews, and
remove the cover plate.
WARNING!
Be careful with the fan cable when opening
and removing the cover plate. The fan cable
must not be streched.
xx0600002913
• A: attachment screws (5 pcs)
• B: fan cable
Continued
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