7.8. Draw Diagram
You should draw diagram of the components before
disassembling. It may seem very easy to disconnect the
components. But you may fall in trouble during reassembling. If
there is no distinct marking on a cable you should mark it by a
marker. The purpose of your diagram drawing is that, during
reassemble you can build the machine as you found before
disassembly. You should pay special attention on the following
things:
7.8.1. Ribbon Cable
These are flat cables where several wires are connected parallel.
These are connected to the upright pins on the circuit board. You
will find a dark line on the cable on one side. Note down the
direction of the dark line during connection. Is it towards the power
supply or towards the speaker?
7.8.2. Board and Cable Placement
During disassembling the cables and expansion boards note from
which slot you disconnect it.
7.8.3. Jumpers
You will find jumpers on the motherboard and hard disk. Jumpers
are connectors connecting two neighboring pins. You should draw
the position of jumpers on the motherboard.
7.8.4. Motherboard Connections
You will find many connections on the motherboard like power
supply, speaker, and key lock etc. connections. These
connections should also be noted.
Power supply connections: These are two plastic connectors
labeled P8 and P9. Be careful about these two connectors
because placing them in wrong order may burn the whole
motherboard.
Speaker connection: This connects the motherboard with the
speaker. It generally has two wires: one yellow and one black.
Key lock connection: some systems provide key lock. If you can’t
connect them properly, it may not work.
Disk lights: There are two connections for disk lights - one for hard
disk and another for floppy. These lights glow when the disks
active. You should also note where these connections go and the
directions of these connections.
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