Re: Wico XY Pattern Generator - Decoding Switches

David,
Many thanks. I’ll put a shorting block to the R3 topside so it can be disconnected – I’m pretty sure it should be there; even tho TTL generally defaults to “high” if unconnected.

I found the problem I discovered – It wasn’t with the 7490; but all the 7493s. For some reason your pinouts via PADS appear wrong.
http://www.ti.com/lit/ds/symlink/sn7493a.pdf
Fortunately; the QA is right ... but QB/C/D are incorrect . On the 93; they are not wired as in the 92... 90 and 93 do share the same pinouts tho.
So; are the pin NAMEs right; or are the pin numbers? looks like the same “mistake” is present on U3/U4/U5.

I’ll go ahead and wire up the opamps – thanks for the info.

John

From: David Fish
Sent: Monday, November 07, 2011 8:43 PM
To: vectorlist@vectorlist.org
Subject: RE: VECTOR: Wico XY Pattern Generator - Decoding Switches
John,

>>@A-7 on page 1; R3 topside is listed as a NC.

Weird but that’s the way it is on my board. Maybe they forgot to add a +5V jumper.

>> I think you had Q2 and Q3 pins swapped

The pinout for the 7490 is correct QA=12, QB=9, QC=8 and QD=11. The PADS library part used Q0-Q3 instead of QA-QD.

>> The Power supplies weren't pictured for U14, 15, and 16.

Good catch. They’re powered by +/-12V, but that’s not shown on the schematic.

I think the connector issue stems from the fact that they have the two identical connectors numbered opposite of each other. The main board 8-pin connector is 1 thru 8 L->R while the switch board is 1->8 R-L. I wonder if I plugged my cable back in wrong? There’s no labels and the keys are symmetric (stupid). Will look into this more tomorrow.

Dave

From: owner-vectorlist@vectorlist.org [mailto:owner-vectorlist@vectorlist.org] On Behalf Of Zitt Zitterkopf
Sent: Monday, November 07, 2011 5:37 PM
To: vectorlist@vectorlist.org
Subject: RE: VECTOR: Wico XY Pattern Generator - Decoding Switches

Dave - You rock! Thanks to everyone else too.
I've schematic captured based upon your schematics; Dave - many thanks. The only peices I haven't captured are the PSU, the 2nd page, and diode switch matrix.
 
Some questions came up while "re-engineering" the schematics.
 
@A-7 on page 1; R3 topside is listed as a NC... I'm guessing this is incorrect as why would anyone put a resistor without a second conection?
My Guess is that R3 ties to +5V like the other two (R4, R5).
 
IIRC; something was "off" when I wired U2 @ D-6. I think you had Q2 and Q3 pins swapped. I'll look for sure when I get home.
 
The Power supplies weren't pictured for U14, 15, and 16. These Opamps are tied to the +12 and -12 rails?
I plan on simulating the opamps to try to gain insight as to what they are doing.
 
Seems odd that the DAC08s are driven from a non-linear voltage rail. IE V+ is 5V and V- is -12V. I'd have thunk they rails would be symetrical. IE +/-12V. Maybe the opamps linearize it?
 
Can anyone get me some rail power measurements?
I'm going to try and do away with the transformer and linear regulators in favor of a more complex (yeah; I know K.I.S.S) PWM psu which puts our all three rails.
If I knew what the average current was for each rail; a small PWM might be nice and cheap.
 
I *so* wish this was an opensource hardware project ... I'd so like to release my PCB and schematics (assuming it works) to the public.
<sigh>
 
John

--------------------------------------------------------------------------------

From: dfish_1@comcast.net
To: vectorlist@vectorlist.org
Subject: RE: VECTOR: Wico XY Pattern Generator - Decoding Switches
Date: Mon, 7 Nov 2011 17:05:13 -0500

John,

I already have mine apart on my desk. I’m looking at it now. I’m taking lots of pictures.

Dave

From: owner-vectorlist@vectorlist.org [mailto:owner-vectorlist@vectorlist.org] On Behalf Of John Robertson
Sent: Monday, November 07, 2011 4:49 PM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Wico XY Pattern Generator - Decoding Switches

David Fish wrote:

John,

Before you mirror the schematics let me take a look at them in depth. It was a looooooong time ago when I drew them.

Unfortunately, I no longer have the schematic source file or access to PADS schematic cap even if I did. I looked at them online and yes, something looks screwy about the switch board to main board connector pinout. I’m thinking there’s a reversed connector involved here. I’ll let everyone know what I find.

Dave

I have a working WICO XY Pattern Generator if you need any pictures (either of you) just let me know and I'll crack it open...

John :-#)#

From: owner-vectorlist@vectorlist.org [mailto:owner-vectorlist@vectorlist.org] On Behalf Of Mark Shostak
Sent: Monday, November 07, 2011 2:44 PM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Wico XY Pattern Generator - Decoding Switches

You can mirror the schematics from ionpool

On Mon, Nov 7, 2011 at 12:43 PM, John Robertson <pinball@telus.net> wrote:

Zitt Zitterkopf wrote:

I’m looking at the schematics for the Wico XY Pattern Generator; and can seem to figure out how the Front panel PCB connects to the Main Board.

At A-8 on the main schematics page; it shows P3-1-8 as connected to the D Flip Flops and the A10 of the U7/U8 pattern generating roms.

However, P3 doesn’t seem to connect correctly to the “cable” connected to the front panel board at B-8 on the second page.

It appears that the diode matrix appears to drive set/clear to Dflip flop U6-A which controls A9 on the ROMs.

But I’m unsure of the encoding given I can figure out how “P3” connects to the Front panel board.

Anyone have an idea?

John

Do you have a copy of the schematics so I can put them up on TTL? The manual (such as it is) is there along with images of the Eproms.

ftp://ftp.flippers.com/TTL/TestEquipment/WICO

Thanks,

John :-#)#

-- John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames) www.flippers.com "Old pinballers never die, they just flip out"

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Received on Mon Nov 7 22:49:01 2011