ABB IRC5 Product Manual page 135

4.8. Replacement of DDR SDRAM memory on motherboard in computer unit DSQC639
Equipment
Standard toolkit
Other tools and procedures may be required.
See references to these procedures in the step-
by-step instructions below.
Circuit diagram
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.
3HAC027707-001 Revision: D
Action
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
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 27
3. Remove the computer unit
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.
4 Repair activities, controller IRC5
Note
The contents are defined in section
Standard toolkit
These procedures include references to
the tools required.
See Circuit Diagram on page 195
Note/Illustration
26.
Detailed in section
computer unit DSQC639 on page
xx0600002913
• A: attachment screws (5 pcs)
• B: fan cable
Continued
Replacement of
122.
Continues on next page
133