(Topic ID: 270868)

Solenoids issue with Williams system 9 CPU MPU

By Theonlylilo

3 years ago

Topic Stats

5 posts
2 Pinsiders participating
Latest reply 3 years ago by Inkochnito
No one calls this topic a favorite

You

You are not signed in!

Find in topic

Linked Games

Sorcerer Williams, 1985
Space Shuttle Williams, 1984

Topic Gallery

View topic image gallery

15920787266664914417937829289755 (resized).jpg

15920786532665699151361626581251 (resized).jpg

You're currently viewing posts by Pinsider Inkochnito.
Click here to go back to viewing the entire thread.

OP
Quoted from Theonlylilo:
I replaced two missing tip102 but no activity on the 1J19 connector grounding the respective input pin of 1J18. No activity except for pin 4 of 1J19 Always lit...

From the looks of the schematics, this board does not have cpu controlled Special Solenoids.
The special solenoids at J19 are only switch activated.
You will need to ground each pin on J18 to get a signal to J19.
If pin 4 lights up the test-led, most likely one component for that output is bad.
Check Q77, Q76, U7 (in that order).

OP
Quoted from Theonlylilo:
With the test rom I need to have the pins on 1J11 pulsating (the LED probe never lies ), but in this case all are always lit. The outputs from the 74ls374 now are high after it substitution.. but probably the issue was not only that.

Are you sure you used the correct and working IC?
If all outputs are high, all solenoids get activated at J11.
Another option can be the IRQ signal coming from U16.
If the output at U16 pin 8 is high, the output at U46 will be high all the time the data lines are high.

OP
Quoted from Theonlylilo:
To avoid confusion in my head..
For special solenoids, during the test I suppose to have a pulsating signal once the pin is tied on gnd.
Following the schematics: EN u6-11is High, blanking u6-12 is High (Is tied to +5V to have a strong signal). Output u6-13 Is low.
It goes through u58-5 low then is inverter High in u58-6.
Again another 7402 in u7.. pin 8 & 9 are High. Output u7-10 is low.. the relay doesn't click.

I think that is correct.
U7-10 low, the transistor does not open, relay does not activate.
U7-10 has to high for the relay to work.

OP
Quoted from Theonlylilo:
And for all the other special solenoids, the input Is High from u58-6 so, once triggered the correspective pin, the output on u6 or u7 is always low. What am I doing wrong?

The output of U58-6 has to be low for the relay and the special solenoids to work.
The special solenoids switches connect to ground to activate a coil.
As U6 is an inverted AND gate, both have to be low for the output to go high and activate the transistor.

OP
Quoted from Theonlylilo:
About solenoids on connector 1j11, all the output on u46 are high, also the blanking.. so it means that the output of u56 & u57 are High and the pin of 1j11 are always high (and with the test led, I have not a blinking led as like the output readings of 1j12)

I'm at a loss with this problem....

Promoted items from Pinside Marketplace and Pinside Shops!

You're currently viewing posts by Pinsider Inkochnito.
Click here to go back to viewing the entire thread.

Reply

Wanna join the discussion? Please sign in to reply to this topic.

Hey there! Welcome to Pinside!

Donate to Pinside

Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!

Help – Contact – About Pinside – Support Pinside – Top