(Topic ID: 290472)

Bally Vikings F2 Fuse Blowing/ no displays

By Scottiiboyii

3 years ago



Topic Stats

  • 2 posts
  • 2 Pinsiders participating
  • Latest reply 3 years ago by wayout440
  • Topic is favorited by 2 Pinsiders

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#1 3 years ago

Purchased a VIKING and all works, sounds, lights, flippers everything except the display. And the F2 3/4A keeps blowing. But still plays with the F2 fuse blown.

Replaced the driver board with a new alltek ultimate driver board and put that in(thinking it was an issue with the driver board)... same thing F2 keeps blowing. But now when I turn it on... still no displays but only GI comes on.

Did the MPU get blown now?

Just puzzled of what it might be.

Thanks everyone.

#2 3 years ago

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?

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