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Maintenance
6–16
TDS3000 Series Service Manual
3. Disconnect the external power cable from the battery board. See Figure 6–7.
4. Remove the three screws that secure the rear chassis to the front chassis.
5. Lift the rear chassis assembly from the front chassis. Thread the external
power cable through the hole in the front chassis.
STOP. If you do not need to disassemble the rear chassis assembly, skip to the
next procedure, Main Board, on page 6–20. The following instructions describe
complete disassembly of the rear chassis assembly. However, you can just
remove the modules from the rear chassis that appear to be in the way of the
module you need to access.
6. Remove the power switch extension from the power switch.
7. Disconnect the 18-pin DC power cable from the battery board. You can use
the
1
8
inch flat-bladed screwdriver to help pry it loose.
8. Remove the two screws that secure the battery board to the rear chassis.
9. Disconnect the fan cable from the battery board. You can use the
1
8
inch
flat-bladed screwdriver to help undo the connection.
10. Unsnap the battery board from the rear chassis. You can use the
1
8
inch
flat-bladed screwdriver to help release the board from the snap post.
11. Disconnect the AC line power cable from the power supply.
12. Remove the DC power cable from the power supply.
13. Remove the two screws that secure the power supply to the rear chassis.
14. If you are replacing the power supply, remove the two screws that secure the
power supply to the power supply bracket.
15. Remove the external power jack from the rear chassis.
16. Use the
3
16
inch nut driver to remove the two jack posts that secure the
parallel port cable to the rear chassis. Do not lose the washers.
17. Remove the AC line power cable from the line filter and from the tab on the
chassis.
18. Remove the two screws that secure the line filter to the rear chassis.
19. Carefully bend the tabs that secure the fan to the rear chassis and remove
the fan.