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#1 |
Registered User
Join Date: Aug 2008
Location: Salisbury
Posts: 768
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A600 Audio Filter Always On!
Hope you guys can help. Basically I was trying to setup my A600 and A1200 as a DJ setup using the PT-1210 software I wrote (as previously shown by Akia, hi mate).
I finally got around to setting it up today and the first thing I noticed is the A600 sounds like the filter is on. Direct comparison between the A600 and A1200 playing the same tune definitely sounds like it thats the case. I know for a fact the code is disabling the filter (standard PT-Replay). Also the A1200 just simply sounds like it should! Firstly has anyone else ever had this problem? Secondly, there is a thread on here somewhere which says I can hard disable it by removing the Q341 transistor. I've located it (far right side of the mobo, last in a line of 3) Has anyone ever done this mod? Any info would be awesome. Cheers |
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#2 |
The show must go on.
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Did you recap the 2 audio caps? because music will sound dull with old caps.
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#3 |
Registered User
Join Date: Aug 2008
Location: Salisbury
Posts: 768
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nope, bugger.. that will be what the problem is then as there seem to be leakage! F@*K sticks!
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#4 |
Registered User
Join Date: Aug 2008
Location: Salisbury
Posts: 768
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looks like new caps then
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#5 |
Unregistered User
Join Date: Sep 2012
Location: Copenhagen / DK
Age: 44
Posts: 4,190
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Does the power LED changes intensity when you enable/disable the filter (or just reset the machine)? Because they are hardwired together.
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#6 |
Registered User
Join Date: Aug 2008
Location: Salisbury
Posts: 768
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yep. definetly does dim when changing the filter. There was crap on the motherboard right around the capacitors so its gotta be that.
Gutted ![]() |
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#7 |
Unregistered User
Join Date: Sep 2012
Location: Copenhagen / DK
Age: 44
Posts: 4,190
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Sounds very likely yes. But when you take them out, be sure to check all the connections before soldering in the new ones as it is likely that something's broken.
Just replacing the caps with new ones will probably not fix the problem. |
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#8 |
Registered User
Join Date: Aug 2008
Location: Salisbury
Posts: 768
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Bugger, I need a professional to fix this then
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#9 |
Registered User
Join Date: Jun 2010
Location: PL?
Posts: 2,878
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connect U15 (LF347/TL084) pins 8 and 5 for Right Channel and pin 14 and 3 for Left Channel - if audio sounds like Filter OFF then issue is located somewhere around FET transistors (for example issue with U28 MC1488, CIA etc).
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#10 |
Registered User
Join Date: Jun 2012
Location: UK
Age: 44
Posts: 748
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Also going by my already recapped A600, even with the filter off the audio is a fair bit muddier/duller than an A1200. The difference is not noticeable on a TV but with a Hi-Fi it's obvious.
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#11 |
Registered User
Join Date: Aug 2008
Location: Salisbury
Posts: 768
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Seems I've found a sollution, a friend of mine is going to do a like for like A600 swap with me. He needs it more for ASCII art than sound
![]() btw all this is leading up to Sundown Demoparty this weekend..... i'll post another thread |
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#12 | |
Registered User
Join Date: Jun 2010
Location: PL?
Posts: 2,878
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Quote:
This will not fix problems with dry/leaking caps. |
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#13 |
Junior Member
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I suspect the same here with an A600 Rev1.5. Audio caps and some around the power input all smell fishey and look a bit off!
Im going to send over to the guys at Amigakit, not sure when but re-capping is something I will not even attempt without the correct stuff! Those two audio caps are so close to the keyboard ribbon slot... how can somebody replace them without causing damage? |
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#14 | |
The show must go on.
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Quote:
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#15 |
Registered User
Join Date: Aug 2008
Location: Salisbury
Posts: 768
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well I tested another working A600 at the weekend and finally found at that basically, the a600 has shit sound circuits compared to the A1200. While at the demo party someone overheard me and said, "I have a spare A1200, you want it? I don't want any money for it" :O so I have two now, and they both sound great.
Aparently its well knows the 600 sound isn't great and there is a way to make it better, but I dont need to now ![]() |
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#16 |
Registered User
Join Date: Sep 2006
Location: Thunder Bay, Canada
Posts: 4,323
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There is a way to change the gain on the A600 audio circuit similar to the hack for the A500, it can be increased or decreased by swapping out 2 resistors of different value
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