Just received the machine.
It seems the seller did not do a great job with the packing; two of the IC chips were dislodged from the motherboard with bent pins (one pin was broke off!), the bottom of the casing has a slight crack, and the whole front panel is loose as the plastic isolation screws that attach it to the motherboard have sheared.
So… after a lot of work, I managed to bend all the pins on the IC chips straight, solder a new pin on to to the chip that has a broken one, and put it all back together, and thankfully the unit powers on. BAT is displayed on the LCD.
Beate_r you’re correct: this machine uses two IC chips (the ones I repaired actually). One seems to be a real time clock, the other is a memory chip with a phantom clock. In both case they have battery for when the machine is powered off. Given that this machine loses all settings when powered off, these chips will need to be replaced as the batteries are obviously shot. Thankfully modern direct replacements are in production (about 40 dollars cost in total for both), and the chips fit in to sockets so no soldering needed.
I looked up the other chips and they are either current related or programmable; there do not seem to be any other battery chips inside, nor any batteries singularly.
I’m waiting on the oscilloscope and probes to test further, but in the mean time I notice two other oddities:
-When the footswitch is depressed, no current is delivered to the holder (as in, the lights do not flash on, nor is any sound made). I’ve confirmed the footswitch itself functions properly, so I’m at a loss as to where the problem is. When doing cata the DC light turns on when both anode and roller are in contact with skin.
-The “omniblend” mode, which per the manual is accessed by pressing “blend” until omniblend shows on the the LCD, doesn’t seem to work because it’s never shown on the LCD. Not that I plan on using it, but would be nice for the machine to function completely.
On the plus side: everything else seems to work as it should.