Turn the clock upside down

Remove the 6 screws.

With the help of a pry tool, pop the cover open.

Open it from the back towards the clock display.

De-solder the speaker connections.

Unscrew the button panel from the top cover.

Pry out the button panel form the cover.

Remove the ALARM ON/OFF button

Remove the FM/AM selector knob

Unscrew the transformer securing screws

Pull it out of the socket

Remove the screws that secures the motherboard to the base.

Grab the motherboard on one side and pry it on the opposite side to release it from the base.

For complete disassembly de-solder the transformer.

...and the button (control) board