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Blitz 99 4 Player 49-Way Control
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MonMotha:
Clean off your existing board with some rubbing alcohol and a toothbrush or q-tip.  Should give you a good idea of what parts are dead, if any.  Looks like you have 3 toasted resistors at the left of that bank near the 4th player connector.  They could be easily replaced at a parts cost of a few cents, and you'd probably have a working board.
Cenzo:
Well its 2:30am so I'm going to bed.  I cleaned the board lightly with rubbing alcohol and a few q-tips.  See attached pics. 

Thanks MonMotha!  I very much appreciate your time.

Vince
Cenzo:
Good Morning,


I went back in and used a toothbrush as you had suggested.  It definitely cleaned up better.  After making sure it was dry I turned the machine on and played a game.  I now can go down and left & up and left a very little bit but direct left goes direct right still.  I think a few those surface mount passives that you had mentioned earlier are truly bad.  Is there way to test them individually with a multimeter?  I don't solder much but may be able to try it if I could get the new working surface mount passives in town somewhere.  I put in a lowball offer on the untested board on ebay.  He wanted $80 and I put in an offer for $20 and he came back with an offer of $40.  I'm just nervous about paying $40 for a untested board.

See the new pics:
MonMotha:
Most of those resistors around the edge will have one end open if you disconnect all the cables, so you could test them on the board with a multimeter.  Put it on the 20k setting and check right across both sides of each one.  Expected resistance is written in a code on the top where the first 2 numbers are the "significant digits" and the last number is the number of zeros to add (so 472 is 4700 or 4.7k).

0805 passives (the size used on that board, IIRC) are probably not available at retail in your area, but digikey or mouser will happily sell them to you in small quantity at reasonable prices.  Digikey will even just dump them in an envelope and mail them to you 1st class mail for a buck or so.  May just be that you need to reflow some of the joints.
u_rebelscum:

--- Quote from: Cenzo on October 26, 2009, 11:46:03 am ---...I now can go down and left & up and left a very little bit but direct left goes direct right still. 
--- End quote ---

Check you 49-way joystick first.  Cheaper and easier to replace, and easier to test too.  With straight all the way left resulting in right, propably one, repeat 1, connection somewhere is not working: most likely the X axis "direction" pin.

Quick 49-way overview:
Four pins/cables per axis.
Three optical sensors per axis, each with its own pin & cable connection to the board.
The fourth pin/cable is the "direction" pin.
Centered stick, all optical sensors are blocked.
Full left & full right, all optical sensors are open, so the only difference is the direction pin.
The direction pin is set from the joystick board by the order the sensors are unblocked.

So test the four pins for the X axis on the joystick, and make sure each make a connection correctly.

If all test good on the joystick, then you'll know the problem is on the I-40.  If the joystick doesn't pass with flying colors, then fix it first before worrying about the I-40.

(Very quick test: test same joystick on player 3, and test a working joystick on player 4.)
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