Wells gardner K4616 help needed

[menace]

As part of my free stuff I picked up a dead K4616 (mfg. by laniel)  On one of the daughter boards where the red, grn blu etc. pins are--there are a bunch of traces cut and wires going from the P205 pins. Its a P302 board and was wondering if anyone had one they could tell me what pin is supposed to connect to where on this board.  the schematics for a P302 board are no where to be found so I'm hoping someone else has one.

here's a pic (front)

[menace]

and the back...

[Ken Layton]

Boy, that's what I call hacked!

I looked around on the internet too and can't find anything for the k4616 model let alone the P302 interface board. I recall seeing that board in a couple of cabinets I converted a few years ago and I don't remember seeing all that hacked up crap on it.

Does the tech support dept. at Wells have a schematic they could fax you?

[Rocky]

Well, that looks somewhat different from the daughter card on my 4606.

The pins on the left in the picture are for connecting to the PCB signal to the monitor.

Top to Bottom:
Red
Green
Blue
Ground
Pos V Sync
Pos H Sync


Ground
Neg V Sync
Neg H Sync


Good luck,

Rocky

[Ken Layton]

Fortunetely, all versions of the video interface card are interchangeable between the various versions of the 4600 series monitor.

The lower the "P" number the earlier the version the board is. Here are the versions I know of:

P297 has composite negative sync only. There is only one video input connector. Originally installed on 19K4601. Video input (P205) connector pinout:
1 - Video green
2 - Video blue
3 - No connection
4 - Video red
5 - Ground
6 - Composite negative sync

P298 has seperate positive sync only. Originally installed on 19K4603 & 19K4653. Video input (P205) connector pinout:
1 - Video red
2 - Video green
3 - Video blue
4 - Ground
5 - Vertical + sync
6 - Horizontal + sync

P302 has composite negative sync only. Originally installed on 19K4602 and 19K4604. Video input (P205) connector pinout:
1 - Video green
2 - Video blue
3 - No connection
4 - Video red
5 - Ground
6 - Composite negative sync

P306 has positive and negative seperate sync. Originally installed on 19K4615. Video input (P205) connector pinout:
1 - Video red
2 - Video green
3 - Video blue
4 - Ground
5 - Vertical + sync
6 - Horizontal + sync

Sync  connector (P204) pinout:
1 - Ground
2 - Vertical - sync
3 - Horizontal - sync

P317 has positive and negative seperate sync. This is the latest version and has the desirable "horiz. centering" pot mounted at the edge of the board right where you can easily get to it. The "black level" (a.k.a. brightness) is also mounted next to this pot. Originally installed on 19K4625, 19K4626, and 19K4675. Video input (P205) connector pinout:
1 - Video red
2 - Video green
3 - Video blue
4 - Ground
5 - Vertical + sync
6 - Horizontal + sync

Sync connector (P204) pinout:
1 - Ground
2 - Vertical - sync
3 - Horizontal - sync

Edit:

Oh, hold the fort----I just found one of my Wells manuals and found the P302 schematic. Wells-Gardner manual number 69X0942-100 dated 9-80 has the info for this board in it. This is the manual for the 4601, 4602,4603,4604, and 4653.

I think this board was used on Galaxian games originally.

I can see now that someone hacked your board to swap the color input terminals to match standard wiring and they added the 3 pin connector which would normally be the negative sync input. I bet they probably had a couple of transistors mickey-rigged on the foil side of the board for using negative sync. Looks like that part of the mod has been removed.

[menace]

Again ken you save the day!  1980 you say?  judging by the sedimentary layers of grime on this thing, that should be about right .  So if I de-hack the board and return all the traces to normal, and hook it up properly it should work correct?  What would positive sync hook to do you think --horizontal+ and vertical+ twisted together?--I guess I can't wreck it too badly from this point.

[paigeoliver]

Anybody know a good source for those boards? I have two monitors (a 13" and a 19" that are missing those cards), and are all the WG plug in cards compatible, or is it only for certain ones?

And in a related note. Grrr, if you are going to leave the monitor in a game fine, but don't jack the daughterboards off the monitors at the last minute.

[Ken Layton]

These boards show up on ebay all the time. Here's where to look on ebay: "All Categories" -> "Collectibles" -> "Coin-op, Banks & Casino" -> "Coin Operated" -> "Arcade" then type monitor into the search box to narrow things down.

Yes all versions of the video interface cards and the horiz/vert deflection cards are interchangeable in the various 4600 models. The P317 board with the "horiz centering" pot feature only works in the 4625, 4626, and 4675 chassis. All other functions of the P317 will work in older monitors like the 4601, but the horiz centering feature won't work as the main board is not wired for the feature.

[Ken Layton]

There is also the P318 board. Mainly the same as the P317 except some resistor values were changed in the color amplifier section for improved operation. Also the black level control and the horiz centering control are mounted at the outer edge of the board where they are easy to get to.

[fa001]

I am having what appears to be a sync problem with a WG 19K4601.  I am trying to connect it to a JAMMA board which has composite neg sync.
I read this post but can not find any board number on the interface board.
There is a label on the CRT which suggest a pinout but looking at the traces on the board pin 4 looks to be ground.

Any suggestions?

[Ken Layton]

You have a P298 board. It accepts positive sync only so it won't work with Jamma gameboard video.

[fa001]

Thanks for confirming that. Someone must have changed the interface board and not marked out or removed the decal showing the connections. Way to cause confusion.

However all does not seem to be lost. I found in my Cabal game manual Star Tech Tips which suggest two cures. One uses the 74LS04 method to invert the sync. The other uses a modification to the interface board. The modification is for the WG 85x140B interface. My board has 85x140C etched on it. So I must be close.

It also appears that all the traces are on the board so that one could add the original parts to add the neg sync connections.

I think that I will try a quick 74LS04 circuit to confirm the monitor works.  Then go for the hack to the interface.

[Ken Layton]

I have started a picture ID thread of the various video interface boards used in the Wells-Gardner K4600 series monitors:

http://forums.arcade-museum.com/showthread.php?t=204208

[Ken Layton]

BUMP

This thread has been updated with pictures/schematics/layouts/parts lists for all known 4600 series video interface boards:

http://forums.arcade-museum.com/showthread.php?t=204208

[Ken Layton]

and the back...

I know this is an old thread Menace, but that P302 board you pictured has been modified from it's original pinout of the P205 connector:

Green
Blue
No Connection
Red
Ground
Composite negative sync

They cut traces, added jumper wires, and replaced connectors to give a modern pinout for use with JAMMA games. Because the original P205 connector had a terminal chopped off, someone replaced it with a new 6 pin right angle connector plus added a 3 pin right angle connector where there was not one before.