I'm helping out a friend with a Rowe R-88 phonograph jukebox.
The phono power supply unit is providing +8 VDC, +28 VDC, but is not providing 28VAC.
I've disassembled the phono power supply unit, and the transformer windings produce good AC voltages.
Looking at the circuit board for that PSU circuit board, P/N 60887301 (which we have reason to believe the entire PSU is actually from an R-84 or R-85 unit), I identified one small TO-92 transistor as shorted. There are three small TO-92 transistors on the board. Out of circuit it's shorted, and a component tester read it as a 75-ohm resistor (that's how bad it is).
The transistor has a National Semiconductor logo, and is numbered "927" on top, then "S300H" and has the emitter, base, and collector pins labeled. I've googled and I'm not coming up with what this is. The other two small transistors have a different marking, "922" and then the same "S300H".
I'm looking for any information I can get on this.
If there is a schematic for the P/N 60887301 circuit board,
or an identification of what the "927" National Semiconductor transistor is, or any suitable substitute.