Punchout Help

Phetishboy

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Got a Punchout in a trade recently that I was told had 'graphic glitches'. I plugged it in, turned it on and both screens were white, no game play, video or audio. Reseated all cables, tried again, still white. Bought another tested/ working PCB, plugged it in, still white. Checked the video cables, the top one was disconnected, plugged it in, still white. Can I try a DK style power supply in here to see if the PSU is bad? What else should I check? What is the big gray cylinder on the bottom of the cab? Transformer? This blows. I set my meter to the lowest setting on DC, checked pin one on a few random chips and they were all pulsing between 2.3 and 2.4 V. Does that mean anything to you folks? Where are the 5V tp's on these boards?
 
As for the power supplies, from our own Ken Layton, short answer is no unless modified -

Nintendo "Punch Out" Power Supply "PP-1000A" (CHPU-88-01)

AC power input is 100 vac


3 pin connector

1 100vac
2 no connect
3 100vac

12 pin connector

1 no connect
2 no connect
3 no connect
4 no connect
5 Green Ground
6 Blue Ground
7 Purple Ground
8 Gray Ground
9 White +5v
10 Black +5v
11 no connect
12 no connect

9 pin connector

1 Brown Ground
2 Red Ground
3 Orange Ground
4 No connect
5 No connect
6 Blue +5v
7 Purple +5v
8 No connect
9 White +24 v (meter)


Nintendo "Donkey Kong" Power supply "PP-7A" & "PP-7B"

10 pin connector to Video

1 Brown –5v
2 Red –5v
3 Orange –5v
4 Yellow –5v
5 Green Ground
6 Blue Ground
7 Purple Ground
8 Gray Ground
9 White +5v
10 Black +5v

9 pin connector to CPU

1 Brown Ground
2 Red Ground
3 Orange Ground
4 Yellow +12v
5 Green +12v
6 Blue +5v
7 Purple +5v
8 Gray –5v
9 White +24v (meter)

7 pin connector to sound

1 Brown +16v
2 Red +16v
3 Orange Ground
4 Yellow Ground
5 Green +12v
6 Blue +5v
7 Purple –5v

AC power input is 100 vac


Donkey Kong Jr. uses PP-7A (TKGU-08-00)

Donkey Kong 3 uses PP-7B (TKGU-18-01)
6 pin connector

1 Ground
2 Ground
3 +12v
4 +5v
5 +5v
6 –5v
 
It's most likely a low or missing +5V follow the pinout Joe provided and check all +5V lines after the edge connector on the PCB. When I got mine it had a similar issue but someone had hacked in a switcher and just twisted the 5V line together instead of soldering or crimping it causing a bad connection.
 
That confuses me. 12pin? 3pin? My Punchout has a 9 and a 10 pin.

Take a pic. You should have a 3 pin coming from the transformer on the bottom of the cab. Then the 12pin and 9 pin from the Power supply to the rest of the harness.

If those are the voltages coming from the power supply, then it probably needs to be recapped. Personally if I decided not to recap it, then I'd throw a switcher in there instead of a 20+ yr old switcher that works now, but hasn't been capped. PO only needs +5V, the coin counter uses +24 if you decide you need it.
 
Alright, I just double checked and there is a PP-900A PSU in the machine. I had a PP-1200A PSU sitting on my bench, so I decided to try it. I plugged the 9 pin molex connector into it, and whattaya know, the game fired right up, played the opening ditty and everything. The top monitor was just black and white shapes, no discernable image, but the bottom monitor showed the attract mode just fine. What's weird is that this was with only the 9 pin connector plugged in, the 12 pin was just hanging there. How would I use this pp1200 in this machine? It only has one 9 pin output molex, while the harness has 2 molexes for input, 12 pin and a 9 pin? Me confused, and am still looking for a pp-1000A.
 
+5v is put out on both the 9pin and 12pin connectors. I forget what the current rating for the PP-1000A is compared to the PP-1200A. With a PP-1000A you would have 4 wires for +5 and about 7 for GND with the 2 connectors. With the PP-1200A you have about half that many wires. You should check the +5 to see what you are getting to make sure you are sending enough current to the board as that may be what is causing your board problem.
 
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