TKG3-06 Donkey Kong repair log: special 'Jehuie' edition

smalltownguy2

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TKG3-06 Donkey Kong repair log: special 'Jehuie' edition

Thanks to Jehuie, I'm now the proud owner of an 'untested' 4 board DK stack. I'll try to keep this thread as a way to document my attempt to get this board set going. Since I already have a working 4 board set, I have something to go on.

I'm by no means an arcade repair expert, but I'm learning.

Received the board well packed - thanks. Yes, the board was VERY VERY dirty.

6970105691_ee20e0855d_b.jpg


Mouse nest between the board stack, turds stuck to the board, all kinds of nastiness. Why did I take this on??

I donned some rubber gloves and took apart the 4 boards, removing them from the frame. I removed every socketed chip and set them aside. I will test them in my eprom reader later, to make sure the data on them is OK. Interesting thing I noted on this board set - on the clock board, 2N, 2P, 2R, and 2S are all socketed. On my working 4 board set, these 4 chips are not socketed. Does that mean that this board set has been worked on before? Not sure.

After a quick bath in the dishwasher, things are already beginning to look a bit better:

IMG_9366.jpg


As I was disassembling the board stack, here are the other things I noticed:

1. The ribbon cables are all shot. Chewed up. How hungry do you have to be to eat a ribbon cable? I don't know, but try asking the mouse that took THIS bite:

IMG_9362.jpg


The other 3 cables are all damaged as well. I'll need to replace them.

I also noticed a ceramic capacitor on the clock board is damaged. Not sure if that will affect things, but it would be a good idea to replace it:

IMG_9367-1.jpg


There's also a leg on eprom 4S from the clock board that's about to fall off. I'm not sure if it's a leg that's redundant or n/c, but I'll figure that out later. The leg is barely hanging on by a thread right now, so I'll try to repair it. Unfortunately the near break in the chip leg is about half way down, so to repair the chip I'll probably have to clip the leg off a bit higher and splint on a donor leg from a junk chip. Not sure that's worth doing to an eprom chip that I can replace for a couple bucks. Does anyone have a quick jpeg of the eprom pins and what they do? That way I could determine if my problem chip leg is an issue or not.

Also, I seem to be missing a chip on the clock board. It's the one at 2S. Google search tells me the chip is an 8 bit universal shift/storage register - Texas Instruments. Anyone know where I can get this chip? I don't think I can test the board without this chip in place.

IMG_9363.jpg
 
All of the pins on a 2716 are going to be important :)

But, for reference, here's the pinout:

Code:
    +-----+--+-----+
 A7 |1    +--+   24| VCC
 A6 |2           23| A8
 A5 |3           22| A9
 A4 |4           21| VPP
 A3 |5           20| /OE
 A2 |6           19| A10
 A1 |7    2716   18| /CE
 A0 |8           17| D7
 D0 |9           16| D6
 D1 |10          15| D5
 D2 |11          14| D4
GND |12          13| D3
    +--------------+

-Ian
 
ok I'll send you out the 4 ribbon cables the 74LS299 ic and a new 2716 eprom also I'll give you a new 103 ceramic cap that is missing.
 
Dk chips

Let me know if you dont get the small chip for the clk board . I have an extra one.
 
Okay - replaced the 299 ram, the 4 ribbon cables, and the board now boots.

It goes directly from the boot scrambled characters to the high score screen and stays there. I never see the title screen. It looks like the board tries to switch away from the HS screen, but it just blinks and goes right to the high score again. It's an endless loop.

Any ideas on this, before I start swapping boards?
 
The 299 is not ram but an 8 bit shift register I believe but any way check your Eprom data the chip in your picture missing was eprom 2716 4S but I would verify all chip data.
 
Pulled out my own 4 board stack to troubleshoot this board set. I started swapping boards from Jehuie's board set into my own to narrow down the problems. I found issues on the clock and CPU boards. Clock board had 2 eproms that had bit rot, and I had to replace the one missing eprom too - all required erasure and programming.

The CPU board had bad eproms at 5F, 5G, 5H, and 5K. I had to erase and reprogram them all.

So, in total:


  • A bath in the dishwasher
  • New shift/storage 74LS299 register inserted on CLK board.
  • 4 replacement ribbon interconnect cables.
  • 1 replacement eprom (broken leg)
  • 6 other eproms needed reprogramming
  • Service switch connector damaged - repaired
  • Damaged sync pot - repaired
  • Damaged ceramic cap - no repair needed
And, yes, video proof:




 
Small update to this thread. I was able to repair the damaged eprom today. I bridged the weak spot in the leg with a trail of solder and it stiffened the leg enough to get it socketed again. I re-programmed it and placed it back into the board.

Why bother repairing a busted leg on an eprom that could have replaced for a few bucks? Well, because I can, for one. Also, now all of the orginal roms (with the original labels) are back together again on the boardset.

And I get to keep another spare eprom around for future repairs. Because I'm a cheap bastard.

:D

IMG_9387.jpg
 
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