Road Kings
Williams, 1986You're currently viewing posts by Pinsider nihonmasa.
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Hi guys,
Recently got a Road kings.
MPU had some battery damage right above the holder; and I have the below issue on the displays:
P1 & P2 "y" segments are all on, all the time.
How can I check the cause? If it's located on the MPU or on the display board?
Many thanks in advance for your help!
20210224_181550 (resized).jpgmany thanks to both.
I did check the schematics, reflowed the solder, tried the cables...
Corrosion was not too bad, only component which look damaged was a cap which I replaced.
Neutralized the corrosion with vinegar, and cleaned.
Grumpy: I read 0 in CMOS and 1 in TTL. So I recon it's bad? Do you have an example of a ref I can order to replace it?
Quoted from ChrisHibler:You need a 4.7K bussed 9 pin resistor SIP. The original SRCs are no longer available. They integrated a pull-up resistor and a noise filtering capacitor into the same package. In practice, you won't notice a difference by not having the capacitor in the circuit.
But you really should properly abate the alkaline corrosion which means removing parts, sanding to bare copper, replace parts, conformal coating bare copper. It's tedious but doable on System 11 MPUs. The sooner you abate the damage, the better the chances of success.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact ... for board repairs
http://www.PinWiki.com - The Place to go for Pinball Repair Info
Many thanks for the info!
Will remove those and work on the traces.
This should be ok then?
https://www.ebay.co.uk/itm/363297062189
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Chénens
