Sorcerer won't start a game, help!

[Matt Adams]

I have a Sorcerer here that played fine but now it boots up and just sits there with all the lights on and nothing comprehensible on the displays, also the flippers work when its just in attract mode, press the start button and nothing happens.

I pressed the test button on the CPU and 5 flashes up which (according to the manual) should be fault - Blanking-signal stuck, coin door closed, memory protect circuit faulty or U18 CMOS ram faulty.

Does this fault sound like any of the above could be the culprit and which should I start with?

Any pointers gratefully received!

Thanks in advance.

Matt.

 

[Moonraker]

deleted to avoid confusion with incorrect information.

 

[Jay Walker]

Isn't the above for Bally/Stern games using the pre-'85 boards?.

 

[Moonraker]

Isn't the above for Bally/Stern games using the pre-'85 boards?.

You're right... D'oh

Here's the correct link:
http://www.pinwiki.com/wiki/index.php?title=Williams_System_9_-_11#MPU_Boot_Error_Codes

which confirms what Mat has said already - Blanking signal stuck, coin door closed, memory protect circuit faulty, or the U18 CMOS RAM faulty

 

[Matt Adams]

So do you think I should get a new chip as a first guess, the link (thanks for that by the way) doesn't seem to indicate how to fault find.