Disassembly of HP-19C

[Jonas Sandstedt]

Hello,
I take this in very small steps and have now separated the two housing parts as shown in the photos. In the bottom housing part is the printer and the power supply/printer driver board, and in the top housing part is the logic board that is attached to the key PCB via white ribbon cable.
Now to the questions.
I assume that the printer assembly has to be removed when removing the power supply/printer driver board such that these parts are held together via the flex cable that runs to the printhead (the printer assembly seems to be fastened with three relatively large screws). Is this correct?
But how is the power supply/printer driver board removed? The battery contact tabs protrude into the battery casing that is comprised in the housing and prevent an upward motion, and the board also seems to be prevented from lateral movement by the battery casing (from left to right in the two photos with the power supply/printer driver board).
Finally, can the logic board be removed from the key PCB by disconnecting the white ribbon cable?
I hope for helpful hints in this matter.
Best regards
Jonas