all the sound control lines sound 1,2,4,8,16 and 32 if used must be a 5v high for the reset to work. I would check all the lines for 5v if one is low the card the reset line will not reset the card
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all the sound control lines sound 1,2,4,8,16 and 32 if used must be a 5v high for the reset to work. I would check all the lines for 5v if one is low the card the reset line will not reset the card
exactly black on ground red on lead on the line.....I don't have your particular machine but all system 80B s use the same architecture the MA766 and the 886 use the same type commands. they use pull up resistors on the sound card and negative triggers to control the music and sounds ...most machines use lines labeled sound 1,sound 2,sound 4 ,sound 8 and sound 16 to create 31 possible triggers. During the game there is also a sequence that resets the board ......look on your schematics for these lines and they should all read 5 volts the triggers are so fast that you can only see them with an O-scope and you wont pick them up with a meter other then sound 16 which is controlled by the driver board under certain conditions so during the game it will be high or low but at the start it should be high. The same goes for sound 32 but it is not used in most games
right if one of the lines is shorted to ground the board will not reset at the beginning of the game only when you reset the card manually like you spoke of earlier....you can turn on the game and hit the start button and then do you checks before you shoot the ball
without having the schematics for the game its hard to tell, on most games, sound 16 which looks like pin 9 on A6P1 ...black black green usually comes from the driver board ....usually a transistor on that board and on most games it goes from the driver board thru P9 and then to the sound card.
Pin 10 looks like it is the NOT/Reset Not is designated by the line over the word reset ....from the looks of the and gate its tied to and the pull up resistor it should be normally high 5 .....my guess is that it comes directly from the MPU .....understand here that without the schematics I'm kinda pissing in the wind. That line may supposed to be held low on purpose . The reset of the 6502 chip on the sound board happens on a positive pulse ....that line may go positive for a millisecond at the start of the game to initiate a reset but you will never see it without an O-SCOPE
for now I would concentrate on pin 9 and check for a shorted transistor on the driver board or something mis-wired
i thought about this after the last post ....I would just disconnect and insulate sound 16 off the sound board and then fire the game up and see if the sound card works normally ....with sound 16 disconnected you will be missing some sounds but the card should still work. if it does you need to find out where the short is on that line and it can be the Z2 flip flop chip holding Q5 on which is holding sound 16 low
on the driver board on the schematic and yes I would just pull the pin and tape it back just to test it
z2 provides a high to turn on Q5 which grounds output sound 16 ......so the question is if you open that line does the sound card reset normally on the start of the game ....then you have to figure out is Q5 on or is it shorted .....if it is on there will be a positive voltage on the base you can check it on either side of R5....if there is not then Q5 is bad
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