any one work on pinball machines

[Mark04]

the battery has been relocated, there is some corrosion on the bottom of the board and everything is plugged in tight.
the led behind the score board will flash once when you turn it on and it pauses, then it flashes 2 more times

The early Bally electronic pinballs have a green LED that flashes 7 times on a normal startup. If it does not flash all seven times, then the following are indicated as potential problems. A picture is shown at the bottom of this page.

CAUTION! If you attempt repair on your MPU board and it is unsuccessful, then you will only drive up the ultimate cost of repair. Be sure you have adequate soldering and board repair skills before you begin work. We recommend you cut the pins loose from the chip in question from the top, then pull the pins out from the top while heating the pad to minimize damage. Battery corrosion damage must be repaired, then the area cleaned with dilute vinegar, then clean water to stop further corrosion.

The following is a list of potential causes for failing to complete the 7 flash sequence. The list shows the step that was completed and what are indicated as possible repair items. The first item indicated is far and away the mostly likely, and the following items less likely. If the following designations or explantions are not sufficient, then you lack the knowledge to repair the board yourself and should have it repaired by someone with the required knowledge and experience.

Always off: 12 volt missing, 5 volt missing, LED circuit bad *
Always on: C14, C15 shorted, U16 bad, U15 bad, U9 bad, Reset line bad, valid power circuit bad, U19 bad
Erratic flashing: Bus bad
Flicker/flash: U1-U8, U10, U11, U9
1 flash: U7, U9, U10, U11
2 flash: U8, U9, U10, U11
3 flash: U10, U9
4 flash: U11, U9
5 flash: Interrupt circuit fault, U11, U12, C16, C17
6 flash: Interrupt circuit fault, U10, Fault in zero crossing circuit, U14, U18, U19
7 flash but game operation improper: U11, U10, U20, U14, U19. Note: Good PIAs of certain brands may not function correctly in some of these machines. If a switch matrix or solenoid problem is a headscratcher, try swapping with a PIA of a different brand.


* - Test Points for voltages on the Bally MPU are: TP1: 4.75-5.25 volts (5 volts nominal), TP2: 10.5-13.3 volts (11.9 nominal), TP3: 21.5 volts, TP4: ground, TP5: 5 volts nominal.
http://www.eteonline.com/ballympu.html

[forbes]

thanks for the info....
considering this is my first one.. i think ill pay

[Ratt]

By the way. There is a huge pinball event here in Texas next month, March 23-25th
at the Hilton DFW Lakes Executive Conference Center in Grapevine. http://texaspinball.com/tpf/
\

Hey I used to work at that hotel. Maybe my old manager can score me some tickets.

[Mark04]

thanks for the info....
considering this is my first one.. i think ill pay

New Replacement MPU's are available here.http://www.flippers.com/UltimateMPU.htm
Repaired originals are usually all over ebay.

[forbes]

Hey I used to work at that hotel. Maybe my old manager can score me some tickets.

get me one.. i plan on going

[Mark04]

If you go early on Saturday, they have a big swap meet in the parking lot and I'm sure you can find a good MPU for cheap.

[forbes]

If you go early on Saturday, they have a big swap meet in the parking lot and I'm sure you can find a good MPU for cheap.

i plan on it.. i just not sure if that is what it is..
the pin smith is suppose to call me.
i contacted those that were listed above, and that is who they recomended

[Mark04]

If you plan on keeping it - you will need a spare MPU.

[forbes]

way cool.. thanks.. i appreciate the info.. now i am on the search for a good funhouse machine

[Stoner]

Looks like you got this covered way better than I could have. Good luck.

Older pinball machines are much more fun to play then the newer ones IMO.

[forbes]

Looks like you got this covered way better than I could have. Good luck.

Older pinball machines are much more fun to play then the newer ones IMO.

i need more than luck... if you are in the plano area, i'll pay u to take a look at it andf help me out