Author Topic: magic castle help needed  (Read 615 times)

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Offline Retropin

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Re: magic castle help needed
« Reply #15 on: September 18, 2010, 10:34:13 PM »
LOL!!!

 Be careful when reading Zac schematics.. they dont show what is in front of you.. they show the logic of operation, this MIGHT be the case in the coil you are scratching your heads over.
The flippers are shown clearly as dual winding coils... your gate isnt. Its possible that the THEORY of this is that this coil is a holding coil and so a single winding is shown. In reality, a dual winding is used to achieve this.

If you go and look at your CPU schematics and compare to what you have on your boards, youll find AND gates on the schematics but NAND gates etc on the board, and so your inputs will not read as the high and high displayed etc or vice versa.

You cant read ZAC diagrams like you can GTB or WMS for example... you only read them as theory of operation.
Zac games can really screw with your head when fixing them... The ZAC website by David gersic doesnt always help either... he is very keen to put at fault the dual RAM chips as common fault... ive fixed 3 Zac games so far.. the first really hurt my head.. all 3 had CPU faults and on none of them were the RAM chips at fault... diagnosing what was in front of me was.

Good luck!!!!