Acer Aspire T690 Service Manual page 52

2-5 . Disconnect FDD data cable from the MB connector.
2-6 . Disconnect the ODD data cable and power-cable from the rear of ODD.
ODD data cable
2-7 . Disconnect the FDD data cable and power-cable from the rear of FDD.
FDD power-cable
Standard Disassembly Process
ODD power-cable
FDD data cable
FDD data cable