Donkey Kong +5v test points

andrewuts1

Active member
Joined
Nov 5, 2007
Messages
397
Reaction score
53
Location
Bettendorf, Iowa
Can anyone tell me where to test the +5v on my donkey kong pcb. I have a switching power supply in the cabinet and want to make sure I have it turned up to the appropriate voltage. Thanks, Andy
 
Can anyone tell me where to test the +5v on my donkey kong pcb. I have a switching power supply in the cabinet and want to make sure I have it turned up to the appropriate voltage. Thanks, Andy

Always best to check at the ICs. Pins are counted counter-clockwise. The last pin on the "left" will be GND, the last pin on the "right" (as you're counting) will be VCC (+5V).

The chips are marked with an indent on the "top" of the chip. That marks where you should start counting.

01 \/ 24
02 -- 23
03 -- 22
04 -- 21
05 -- 20
06 -- 19
07 -- 18
08 -- 17
09 -- 16
10 -- 15
11 -- 14
12 -- 13

For the example above. Pin 12 is GND, pin 24 is VCC. It continues the same way for other chips. If it was a 28 pin EPROM, then pin 28 would be VCC, pin 14 would be GND.

The pattern continues on pretty much every IC out there (processors and customs aside).

Measuring at the chips is the best (IMO) way to to get a "real" measurement of voltage. While there won't be too much of a drop from the edge connector to the chips, it's just easier to measure at the chips since you don't have to memorize (or even really think about) the pinout of the game. And I say "real" because it doesn't matter what you have from the power supply, at the edge connectors, etc etc... the game is only concerned with what the actual chips are getting. If it's 5.15V at the PS, but only 4.8V at the chips on the board... then you're really only getting 4.8V.

That's only for +5V. For -5V and +12V you're going to have to check at the power supply and edge connector.
 
Last edited:
Back
Top Bottom