How do I change out the power supply unit in a 6200 Apple
1. Unplug everything.2. On the back of the computer, locate the two latches holding the I/O cover trim plate (at the top of the plate), push them downward and swing the plate out from the top to remove.3. Remove the two screws from the upper corners of the I/O plate. Locate the wire handle placed a little to the right of the center of the plate. Unhook and pull to remove the logic board assembly from the computer. Note: the logic board is easily damaged by static electricity. Do not touch it unless you are wearing an antistatic wrist band connected to the I/O plate. Set it aside on a static-safe surface, or stand it on edge where it won't get knocked over.4. Remove the two screws on the upper back trim (one above and to the right of the video connector; the other to the right of the serial number label). Pull out at the top of this plastic piece and swing it away from the computer (similar to the piece removed in step 1).Note: all screws removed up to this point are identical.5. Look under the overhang at the front of the computer. You will see two slots with tabs inside them. Use a large flat-blade screwdriver and carefully pry upward on these tabs while pulling outward on the bottom of the front piece (you want to lift the tabs just enough to unhook them from the chassis). When you have these disengaged, the front lifts away from the computer.6. Lift the front of the top plastic cover slightly (about 3/32") in the middle and push it forward about 5/8" to unhook it from the top metal cover and remove it.7. Push forward on the sides of the computer about 5/8" to slide them out of their retaining slots and remove them.8. Remove the two screws from the back of the top metal cover, and push it forward to disengage its hooks from the retaining tabs on the sides. You may have to use the flat-blade screwdrivers on the back of the cover to pry it forward enough to get it moving. Do not pull it away from the computer yet; there's a cable attached to it.9. Reach underneath the cover near the front over the floppy drive and unhook the wire cable retainer (squeeze it in from the sides to drop it down from the retainer hooks, then spread it to pull the ends out of the slots). Now you can separate the top from the computer.10. At the front of the power supply, lift the main power cable connector (you may have to squeeze the two retaining tabs on the sides of the connector), grasp the power supply half of the connector so as to squeeze and disengage the connector latch hook, and carefully pull the connector apart. Unplug the red fan connector. Use the flat-blade screwdriver to gently pry up on the lip of the remaining connector on the printed circuit board (use the opposite metal side of the power supply as the fulcrum) and work the connector out of its shell, being careful not to apply too much force and break the connector. Do not yank on the wires! This cable is irreplaceable.11. Remove the two fan screws. Note that they are not identical. Pull out the metal bracket between the fan and the CD drive holder.12. Lift the video card/fan bracket, starting from the video card end (you may want to disconnect the video card cables) and set it aside.13. At the back end of the power supply, next to where the fan was, there is a screw going into the side. Remove it. Note that it is somewhat longer than the screws removed in the first five steps.14. At the front of the power supply, down at the bottom (outside the supply frame), there is one more screw. Remove it (you will probably want to magnetize your screwdriver for this one).15. With the back of the computer towards you, swing the front of the power supply slightly to the right and remove.
Assembly is pretty much the reverse of the above, except that it is easier to start the fan/video bracket from the power supply end; otherwise it can be difficult to hook the side tab around the outside of the chassis (there is a raised edge on the back end of the side; the tab goes just in front of that).
May 31, 2012 |
Computers & Internet