Author Topic: [Restauration] Crazy Kong fase 1  (Read 55452 times)

Laschek

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Re: [Restauration] Crazy Kong fase 1
« Reply #15 on: October 11, 2010, 09:49:33 AM »
I also measured the voltage on the connector that was 5,1 v without the board connected and 4,6 with the board connected, but i think thats fine since i got that result on both boards and one is fuctioning so i guess the power is good

4.6 V is normally way too low, even if it works on the other board. Don't expect two boards to behave the same.

Etienne MacGyver

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Re: [Restauration] Crazy Kong fase 1
« Reply #16 on: October 11, 2010, 10:15:57 AM »
Looks like i need to modify the connector again then...

I am thinking the folowing:
since i dont have a spare powersupply,   use a PC powersupply and take the 5v & 12v line for a test, leaving the powerlines from the cab disconnected
i think that should work right ?

then measure again the power at the board, and see what happens
« Last Edit: October 11, 2010, 04:04:03 PM by Etienne [NL] »

Laschek

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Re: [Restauration] Crazy Kong fase 1
« Reply #17 on: October 11, 2010, 02:23:04 PM »
A normal PC power supply has one big disadvantage: you can't regulate +5V (no pot). And often those old arcade boards do need a little more juice.

Etienne MacGyver

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Re: [Restauration] Crazy Kong fase 1
« Reply #18 on: October 11, 2010, 03:43:47 PM »
This zaccaria does not have a regular powersupply, i dont see a pot to ajust voltages here..



you think that the board suck more than 30 amps on the 5v line  :o

specs of a regular 300w PC powersupply :

RED +5V 30A
YELLOW +12V 14A

I will measure the amps first on the original powersupply to be sure..

ps, you where right about the twist in the two connectors, the top edge connector has the solder and part side inverted
it was clear since pin 1 and 18 where marked on the board  ;)

also you can see the location of the diodes and the resistors:

« Last Edit: October 11, 2010, 03:49:22 PM by Etienne [NL] »

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Re: [Restauration] Crazy Kong fase 1
« Reply #19 on: October 11, 2010, 07:54:33 PM »
Do you have the schematics for the PSU ?

The problem with a PC power supply is not that the old board will draw too much current but that you can't set it a little bit higher than exactly 5Volts.
The voltage decreases over the PCB from front (where the connector is) to the end because of the IC's that suck relatively large amounts of current. (Compared to modern day stuff, except the CPU's that is).

By upping the +5V on the PSU side (let's say to 5.4 V) you will get about 4.8 or so on the end and 5.2/5.3 on the beginning which should be within the range of TTL IC's.

Now a modern day PC PSU is very good at regulating the voltage at EXACTLY 5V even when rather large amps are drawn.

However, because you will input 5V at the "front" of the PCB, you will end up with something like 4.6 at the "end"....that's what Lascheck meant.

Etienne MacGyver

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Re: [Restauration] Crazy Kong fase 1
« Reply #20 on: October 12, 2010, 10:24:23 AM »
No sir, i dont have the schematics, but i will do a search for zaccaria powersupply..

i get what you mean now, you are saying that i have 5.1 volts in the connector and in the end of the circuit it could be that it has dropped to 4,6 volts

but i measure 5,1 without anything connected, and 4,6 when the board is connected

if the PC powersupply delivers 5volts and regulates that in combination with the current drawn from it, it should theoreticly mean that i will have 5volts on the board while its connected, wich is more than the 4,6 that i have now.

so i like to try it just to see what happens, it does not harm anything i guess ?

If that does not satisfy can i remove all the IC's and can you read and check them for me ?
Im curiouse if its a rom / ram or other problem..

@ robinholland:
If everything fails do you want to take a look at the boards ?
It looks like you are an expert on PCB's and you are the person more close to me

Laschek

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Re: [Restauration] Crazy Kong fase 1
« Reply #21 on: October 12, 2010, 11:10:52 AM »
I while back I did a scan of a Zaccaria Crazy Kong manual, it's available here: http://www.antelopearcade.com/manuals/Crazy%20Kong.pdf

Etienne MacGyver

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Re: [Restauration] Crazy Kong fase 1
« Reply #22 on: October 12, 2010, 02:23:37 PM »
Thanx, downloading it now  :)

EDIT:

In the technical manual there is the schematics of the power supply
I see a trimmer (T1) in the way to the +5 voltage regulator (RG1)...

Could it be that i need to cranck that up a little ?
I havent seen it in the cab , because;
a. its dirty inside
b. i did not put my head in the cab yet ;D
« Last Edit: October 12, 2010, 03:05:57 PM by Etienne [NL] »

level42

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Re: [Restauration] Crazy Kong fase 1
« Reply #23 on: October 12, 2010, 05:56:03 PM »
Hey, you ICT guy, remember this golden rule:

Garbage in = Garbage out

 ;D ;D

Let me dl the schematics too...

Superully

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Re: [Restauration] Crazy Kong fase 1
« Reply #24 on: October 14, 2010, 11:07:15 PM »
would that be something for you, etienne?
all i need is ... PONG - and a select few others: TOUCH ME, DRAGON'S LAIR, JOUST, ROBOTRON, MR DO, SAN FRANCISCO RUSH THE ROCK!!!

Etienne MacGyver

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Re: [Restauration] Crazy Kong fase 1
« Reply #25 on: October 15, 2010, 07:14:06 AM »
thanx for the link !

I see it stands still 9 days so i will follow it..  
although i still have muerto's offer and bela needs one too, so maybe he is the bidder ?

Belike

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Re: [Restauration] Crazy Kong fase 1
« Reply #26 on: October 15, 2010, 08:20:42 AM »
thanx for the link !

I see it stands still 9 days so i will follow it..  
although i still have muerto's offer and bela needs one too, so maybe he is the bidder ?

Not me, but if you don't need it, I'll try to catch it! ;)

Etienne MacGyver

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Re: [Restauration] Crazy Kong fase 1
« Reply #27 on: October 15, 2010, 09:13:19 AM »
i just checked, and its now on 1,50 there is a second bidder..
I'll take muerto's offer, and you go for thisone, then we are both happy
just put 24 oktober 18:00 in your schedule  ;)

still thanx to superully for the link !

level42

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Re: [Restauration] Crazy Kong fase 1
« Reply #28 on: October 15, 2010, 10:09:22 AM »
So....did I miss something ? Are you now sure that the boards have problems ? Did you adjust the voltage ?

I have a feeling you're going to end up with 3 working boards..... ;)

Robinholland

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Re: [Restauration] Crazy Kong fase 1
« Reply #29 on: October 15, 2010, 10:33:13 AM »
I can repair the pcb's for a nice price if you want