K4600 Video Interface board information

KenLayton

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I thought I would start a thread detailing the various "Pxxx" Video Interface boards used in the Wells-Gardner K4600 (19 inch) and K4700 (13 inch) color video monitors.

First up is the P297 (composite negative sync) board. Pictures of the front and rear of it.

Parts list:

http://www.arcade-museum.com/manuals-monitors/Wells Gardner P297 parts list.pdf

Schematic:

http://www.arcade-museum.com/manuals-monitors/Wells Gardner P297 schematic.pdf

Board Layout:

http://www.arcade-museum.com/manuals-monitors/Wells Gardner P297P302 layout.pdf
 

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P317 board (has connectors for positive and negative sync). Pictures of the front side of the board. First picture is of an early version in which the locations for the horizontal centering parts are there, but were never installed. Second picture is of a complete P317 with the black level pot on back of the board and only the horizontal centering pot at the edge. Third picture is the later P317 which has BOTH the black level pot and the horizontal centering pot at the edge of the board making them easy to adjust.

Parts list and board layout:

http://www.arcade-museum.com/manuals-monitors/Wells Gardner P317 parts layout.pdf

Schematic:

http://www.arcade-museum.com/manuals-monitors/Wells Gardner P317 schematic.pdf

Only the later production of the K4600's main board was modified to take advantage of the P317 and P318 board's "horizontal centering" pot. Older main boards did not have these mods. If you want to modify your K4600's main board to be able to use the horizontal centering feature of the P317 and P318 boards, this thread will show you how:

http://forums.arcade-museum.com/showthread.php?t=176509&highlight=4600+horizontal+centering
 

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P317 board. Sorry no pictures of it.

You're welcome to use my P317 pics (linked in the horiz. centering thread) if you wish.

They're not straight-on, because I got terrible flash reflection if I did. I suppose I could try getting better ambient lighting and taking a straight-on shot w/o flash...
 
Adding pics for P305 since Ken didn't have any. Big thanks to Ken for this thread as well as uploading to the klov manuals site. This is all great documentation!
 

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If you have an early P317 board you'll notice the two parts for the horizontal centering feature were not installed on the board. The locations are there, just no parts installed.

Here are the two parts that are missing:

VR202 Horizontal centering control, 10k vertical mount style trimpot, Jameco Electronics # 94714

C204 Capacitor, 680 pf @ 100v or higher, ceramic disc, Jameco Electronics # 2162732
 
Ken requested that I send some photos of my P308 board. Here goes! Thanks
 

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Thanks for posting those pictures. :)

I think this covers every version now of the video interface boards.

By the way, the P308 accepts positive sync only.
 
I've got a chassis that a P307 works on but none of my three different P317 work on it?

I find it hard to believe all three are shot but could be. Do the P317 not work on the same chassis as the P307?

Thoughts, anyone?
 
Please specify what doesn't work on the P317.

Just get a blank screen on all three - turning up the juice on them gets a solid white screen. I've reflowed pins, etc. on each of them to no avail.

May just shotgun the diodes and transistors but it looks like TR204 through TR209 are just for color, so those are likely not the issue - unless all those are blown, hence no colors, or anything else, on the screen. :(
 
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You want to concentrate on transistors TR201 and TR202. Both are type 2N3904. Either one or both of them being bad can cause no video to come through. You can even buy them at Radio Shack:

http://www.radioshack.com/product/index.jsp?productId=2062609

Of course I'm assuming you have tested the black level pot with an ohm meter to be sure it does not have a hairline break in the resistance element.
 
You want to concentrate on transistors TR201 and TR202. Both are type 2N3904. Either one or both of them being bad can cause no video to come through. You can even buy them at Radio Shack:

http://www.radioshack.com/product/index.jsp?productId=2062609

Of course I'm assuming you have tested the black level pot with an ohm meter to be sure it does not have a hairline break in the resistance element.

Okay, will swap those as well as the black pot but the pot DOES change the intensity of the screen; would that indicate that it's working correctly?

X203 and 204 - could they be an issue as well since they are in the +SYNC circuit?

It also looks like TR203 and 210 are not an issue as they are in the -SYNC circuit and Centipede is +SYNC, right.
 
I would not worry about any sync transistors.

You should replace TR201 and TR202 in the black level circuit first. I have seen those fail over the years and they are dirt cheap to replace.
 
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