there are two parts to this piece of gear (SONY XES-P1)
in the display, the DC-DC converter takes 12V and produces 5V < 50ma to power the logic, ie. Microcontroller, some Sram, and such. The Dc-Dc converter also has a -8.5v out, that goes to a trim pot and the to VEE of the LCD display... so thats just for contrast
so im gonna get a +/- 9V dc-dc converter, and take the +9 and regulate it to 5V with 7805 and -9v is close enough to -8.5v for the contrast VEE
now in the main unit, there is another DC-DC converter, it takes
12V and produces +/- 18V and +/- 8V
the 8v rails go into 7805/7905 combo and get +/- 5V and thats used for logic and -5v to a ADC.
the +/-18v railes go into 7815/7915 combo and power DACs and Op amps for the gears analog outputs
so, my plan was to replace that 1 quad output dc-dc with 2 separate dc dc converters, 1 is +/-5V and 1 +/-15v
and bypass the the existing 7805/7905 & 7815/7915 regulators
since the new dc-dc converted out is regulated