F2 blowing is specifically the high voltage supply to the displays only, not your MPU.
Typically if regulator board fuse F2 is blowing, one of the 1N4004 diodes on the regulator board has gone open or has shorted. This is a very common problem. Because of the fuse, most times the HV components on the driver board are saved without damage. You can test the four 1N4004 diodes with a DMM set to the diode range. Put the leads on each of the four diodes, and .5 should be seen in one direction and a null reading in the other.
As for the rest, first check all your power supply test points first.
TP1 (on AS2518-18) = 5.4 volts DC +/- .8 volts (4.6 to 6.2 volts). Fuse F1, bridge BR1. Used to power the "switched illumination" (feature lamps).
TP1 (on AS2518-49 & -54) = 6.5 volts DC (5.8 to 7.2 volts). Fuse F1, voltage regulator RP1 and RP2. Used to power the "switched illumination" (feature lamps).
TP2 = 230 volts DC, +/- 27 volts (203 to 257 volts). Fuse F2, diodes CR1 to CR4. Used to power the score displays.
TP3 = 12 volts DC (11 to 16 volts). Fuse F3, bridge BR2. Used to create the regulated +5 volts DC for the game's logic circuits.
TP4 = 7.3 volts AC, +/- 1.0 volts (6.3 to 8.3 volts). Fuse F5. Used to power the general illumination.
TP5 = 43 volts DC, +/- 5.4 volts (47.6 to 48.4 volts). Fuse F4, bridge BR3. Used to power all the coils.
Is there any LED status activity on the MPU? How about the test point LEDs on the ALLTEK driver board? +5 VDC at TP5 on the MPU?