4 SLOT SOUND PROBLEM

L

lill-c

Dodgeball Yakuza
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Oct 22, 2003
Posts
625
I have a 4 slot that has no sound. it looks like the sound amp chip was changed and I reflowed the solder on the chip but no luck. What else could it be? It did one time come up with an Z80 error.
 
Neodogg

Neodogg

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hey where is the sound amp chip? my 4 slot has the faintest sound when the volume is all the way up


:buttrock:
 
L

lill-c

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Neodogg said:
hey where is the sound amp chip? my 4 slot has the faintest sound when the volume is all the way up


:buttrock:
Click to expand...
It is on the bottom board and it has 2 phillips head screws with nuts on the underside of the board it has the numbers HA13001
 
ttooddddyy

ttooddddyy

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Neodogg said:
hey where is the sound amp chip? my 4 slot has the faintest sound when the volume is all the way up


:buttrock:
Click to expand...

Maybe your 12 volt rail is missing
 
ttooddddyy

ttooddddyy

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Neodogg said:
hey where is the sound amp chip? my 4 slot has the faintest sound when the volume is all the way up


:buttrock:
Click to expand...

bottom LHS on this pic
MV-4FallopenSm.jpg
 
ttooddddyy

ttooddddyy

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lill-c said:
Still looking for some help!
Click to expand...

If youve had Z80 errors, check for continuity probs around that area, the Z80 is the sound proc for the audio (along with the YM 2610) the associated memory may be a problem , thats location ram 6116 and rom SM1, remember the board may have three layers of track, ie one sandwiched in the center, so its difficult to confirm visually. Some members have gone in with blanket chip replacements and still had problems- or fucked the board in the process (it can be difficult even with the right equipment)- its a tricky one im afraid.
 
L

lill-c

Dodgeball Yakuza
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Oct 22, 2003
Posts
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ttooddddyy said:
If youve had Z80 errors, check for continuity probs around that area, the Z80 is the sound proc for the audio (along with the YM 2610) the associated memory may be a problem , thats location ram 6116 and rom SM1, remember the board may have three layers of track, ie one sandwiched in the center, so its difficult to confirm visually. Some members have gone in with blanket chip replacements and still had problems- or fucked the board in the process (it can be difficult even with the right equipment)- its a tricky one im afraid.
Click to expand...
Thanks. I guess I will let this board sit.
 
L

lill-c

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I have 12 VDC comming out of the power supply because my other 4 slot works in the same cab. I will check at the chip. Thanks.
 
MKL

MKL

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ttooddddyy said:
remember the board may have three layers of track, ie one sandwiched in the center, so its difficult to confirm visually.
Click to expand...

As far as I've seen in the multi-layered PCBs the internal layers are just for power/ground. All the data traces that disappear from either parts side or solder side reappear in the same point on the opposite side. Have you actually seen a case of a trace running hidden in an internal layer?
 
ttooddddyy

ttooddddyy

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Good point MKL, I will check a MVH-MV1 that had Z80 probs in this area, but it may have been ground and vcc continuity and not address/data connections come to think of it.
 
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