🎥 HPR4212: Replacing backup batteries in my Kenwood TS940S HF Radio Part 4

Link to the
YouTube video I used that described the process of removing the two
backup batteries in a Kenwood TS-940S.
I mention
the acronym PLL which stands for Phase Locked Loop. Here is a Wikipedia
article about PLL.
Picture 1

shows a top down view of the radio. The large black square section
located at the front left of the picture contains...