Rebuild the high-voltage section of a 520-5047-00/-01/-02 supply

Steps

• Transistors: MPS-A92 at TR1, MPS-A42 at TR2, MJE15030 (or MJE340) at TR3, MJE15031 (or MJE350) at TR4, and on -01/-02 boards only an MJE15030 at TR6.
• Diodes: D5 and D7 1N4004; D6 and D8 3.9 V zener (1N4730 or 1N5228); D9 1N4760 68 V zener.
• D10 and D11 depend on the revision: check what is fitted and use the same value (see the revision entry).
• Resistors (values for the -00): 500 ohm 10 W at R15 (the -01/-02 use 130 ohm 5 W), 3.9k to 4k 10 W at R14, 330k 1/2 W at R10/R11, 1.5k 1/2 W at R12/R13, and 47k 1 W flameproof at R8/R9.
• Capacitors C12 and C13: 0.1 µF 500 V.
• Cut the old parts out, clear the holes, fit the new parts and measure the outputs before reconnecting the display.

The display power supply carries about 100 V or more; work on it with the game unplugged and let the capacitors discharge.

Systems

• Data East CPU Version 3
• Data East/Sega CPU Version 3b

Related tips

• Cross the legs when MJE15030/15031 replace SDS201/SDS202
• Test MPS-A42 and MPS-A92 display transistors
• Rebuilding the +100 V section of the power supply
• Rebuilding the -100 V section of the power supply
• -125 V and -113 V read the same and the display is dark
• How a Bally display board drives its glass
• A 520-5047-02 supply can stand in for a 520-5047-01
• Power supply 520-5047-03 does not interchange with earlier supplies

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Three, Clay Harrell (pinrepair.com)