Are there Taito Troubleshooting Guides?

scamp

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Are there any Taito troubleshooting guides?

I recently picked up a Jungle King which isn't working and I was hoping to find a troubleshooting guide. I know Midway had there sort of guides, I wasn't sure if Taito had something similar...

Also if there are any sites or blogs where Taito repairs are documented, please forward as well!

Thanks!!

-S
 
As with all companies, you start with the basics:

1) First look up the manual and pinout.

2) Then start checking power - fuses, voltages, etc.

3) Then see if the monitor works - power to it? Turn up the brightness and see raster?

4) Does it coin up and play blind?

These steps will lead you to others, depending on what you find out....
 
Yes I've done this stuff:

1) First look up the manual and pinout.
Done..I have the manual...

2) Then start checking power - fuses, voltages, etc.
Replaced fuses..new switching supply..power reaches the boards at connector..

3) Then see if the monitor works - power to it? Turn up the brightness and see raster?

Yes there is glow and some scrolling, but not discernible image

4) Does it coin up and play blind?

No..no sounds.no coin up that I can tell..not sure whats happening and cannot tell from display..


These steps will lead you to others, depending on what you find out....

...not sure where to go next....I know Ive seen manuals where there are flow charts and stuff..was curious if there was something like this for these boards...

thanks!
 
I know you said power reaches the board, but do all of the required power levels reach the board and are they within the correct ranges? In my experience the weakest link in Taito cabs is the power supply.
 
Well, once you have the pinout, you start checking to make sure the +5 is on the board where it should be.

Another thing to do is to resocket all chips (that are in sockets :D). If your board has ribbon cables, disconnect them and reconnect. Inspect the board for anything that looks damaged or burnt (especially small parts along the edges). Make sure all chips are in properly (no bent legs or reversed polarity). Check to make sure nothing is missing from the board.

After that, unless you are an experienced PCB repairer, you should probably find a way to test the PCB in another cab or on a test bench, just to see if it is definitely bad...
 
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I know you said power reaches the board, but do all of the required power levels reach the board and are they within the correct ranges? In my experience the weakest link in Taito cabs is the power supply.


I replaced the power supply with a new switching supply....I can see the power reaches the board at the white connector but I'm not sure the chips are getting all the rights voltages on the board itself. I tried checking the Z80A but it didn't seem as though it was getting a full 5v on its pin...
 
I replaced the power supply with a new switching supply....I can see the power reaches the board at the white connector but I'm not sure the chips are getting all the rights voltages on the board itself. I tried checking the Z80A but it didn't seem as though it was getting a full 5v on its pin...

How much are you getting? Sometimes there is a power loss thru the connector to the board. If you're reading 4.8 or so, you can turn the voltage up on the switcher to compensate...
 
Another thing to consider - The pinout:

http://www.crazykong.com/pins/Jungleking.pin.txt

shows that there is a master reset line that must be tied low at the board in order for the board to work. This was most likely done thru the original power supply. If you replaced it with a switcher, then you probably need to tie that pin to ground...
 
Well, once you have the pinout, you start checking to make sure the +5 is on the board where it should be.

Another thing to do is to resocket all chips (that are in sockets :D). If you board has ribbon cables, disconnect them and reconnect. Inspect the board for anything that looks damages or burnt (especially small parts along the edges). make sure all chips are in properly (o bent legs or reversed polarity). Check to make sure nothing is missing from the board.

After that, unless you are an experience PCB repairer, you should probably find a way to test the PCB in another cab or on a test bench, just to see if it is definitely bad...


One of the things I had noticed was that there was corrosion on the resistors...I'm not sure what effect that may have on the operation of the boards...I'll have to pull the boards again and reseat things...

My best bet will be to pickup a working set of boards and then systematically determine what boards are having issues. I did this with a Tron set and it worked out pretty well....
 
Another thing to consider - The pinout:

http://www.crazykong.com/pins/Jungleking.pin.txt

shows that there is a master reset line that must be tied low at the board in order for the board to work. This was most likely done thru the original power supply. If you replaced it with a switcher, then you probably need to tie that pin to ground...


Wouldn't the switching adapter take care of this? It was made for Jungle King....Otherwise how would I "tie it low at the board"?
 
How much are you getting? Sometimes there is a power loss thru the connector to the board. If you're reading 4.8 or so, you can turn the voltage up on the switcher to compensate...

For some reason I thought it was really low..like 2-something..I'll need to check again and take notes...
 
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