The Seeburg Digital Control Center came into use around the 1970's. This was model DDC1. Seeburg continued the use to the digital control center line until around 1977. The last model used was a DCC42-56. The DCC is used to supply 27 volts DC, -27 volts DC and -13 volts DC to the jukebox. The DCC has test points on the side to measure these voltages.
Below you can see a DCC3.
Below is the power supply board removed.
The first thing I always do when working on a DCC is start by replacing all electrolytic capacitors.
Below is the schematic.
As you can see transistor Q3120 has been replaced and someone ruined the trace. Q3120 has 44 volts coming in on the collector and is used to create the -13 volts and -27 volts.
It turned out the transistor Q3120 was just fine. Below you can see my fix.
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