Timber Pcb problems

scr33n

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Hi guys,

I'm testing a Timber pcb ... here the problems:

Sound board - board timeout:



but sound works perfectly ...

in test mode under PLAYER INPUT I see this:



player 1 logger down always active (I don't touch the joystick down)

and sometimes with garbage on screen:



and in title screeen:



and in game:




any ideas ?

Voltage from power supply it's perfect 5.1v

Thanks!!!
 
Last edited:
Yes.... no luck

What does the board do in a RAM/ROM (mainly RAM) check through the DIPs?

And does it do the same thing EVERYTIME you run the test. I had a bad RAM on the SSIO board on my Tron (pretty much the same as your Timber) and it would give me crazy results in the RAM test. Different blinking speeds, sometimes didn't blink, sometimes didn't come on, etc etc.
 
What does the board do in a RAM/ROM (mainly RAM) check through the DIPs?

And does it do the same thing EVERYTIME you run the test. I had a bad RAM on the SSIO board on my Tron (pretty much the same as your Timber) and it would give me crazy results in the RAM test. Different blinking speeds, sometimes didn't blink, sometimes didn't come on, etc etc.

Here my tests - always the same result:

Switch N.3 pin 1 ON (sound I/O diagnostic mode): SOUND BOARD INTERFACE ERROR (Led steady on)

Switch N.3 pin 2 ON (RAM/ROM test): SOUND BOARD TIMEOUT (Led off)

????
 
Here my tests - always the same result:

Switch N.3 pin 1 ON (sound I/O diagnostic mode): SOUND BOARD INTERFACE ERROR (Led steady on)

Switch N.3 pin 2 ON (RAM/ROM test): SOUND BOARD TIMEOUT (Led off)

????

Taken from: The MCR FAQ

For any of the test modes to be operational, SW3/SW#1 must be ON. To test
RAM/ROM, set SW3/SW#1 to ON, and SW3/SW#2 to ON and power up the board. A
steady "ON" LED #3 (in the lower left hand corner of the PCB) indicates
proper operation. A slow blinking LED #3 indicates a RAM error, a fast
blinking LED #3 indicates a ROM error. LED #3 is normally not lit during
game operation.

Check with 1 and 2 put to on to do the RAM/ROM test.
 
Last edited:
Thanks for the interest Scucci

Ok here the result:

Sw1 + Sw2 Led slow flash (bad ram)

and on screen SOUNDBOARD INTERFACE ERROR

Well, there you go. Try the RAM on the SSIO board, that'll probably be your bad guy. It's a very common type RAM (whose numbers slip my mind right now...) but if you have more than 3 arcade boards laying around anywhere, you'll probably find it socketed on a board to test out.
 
sound board board timeout is normal on a timber board when you boot it. If you press the reset button it goes away. It has no effect on the game or sounds, even if you don't reboot it.

When you put it in test mode, getting a sound board interface error is normal, too. If it says bad ram, check the 6116 and or 58725 on the cpu. IIRC, it would be the ram at the top-ish part of the pcb - the one thats closest to the cpu being bad will keep the game from booting at all.
If that still doesn't fix it, i'd change the interconnect cables if you haven't already, that in itself might be the real issue.
 
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