Thats the digital board
Thanks. I can see clearly now. (tribute to Jimmy Cliff)If they not clear will send you to your email..cheers
Test 2A pass.....now testing3ATwo separate tests to perform with DSP board removed:
Test 2A -Jumper from 1A to 2A via 10μF cap.
Test 3A - Jumper from 1A to 3A via 10μF cap.
View attachment 131755
Test 3A pass..Test 2A pass.....now testing3A
Both test passed successful..Test 3A pass..
So the problem is on the DSP board. It could also be a bad U3, WM8569 on the preamp board.Both test passed successful..
Cool...had a guy pick up his phonic speaker from me and was mentioning to him about the mackie..he says he has a busted one similar model giving a distorted funny output...he asked me if i wanted parts from it...hoping his dsp board is ok..what you reckon Mr Chips..??So the problem is on the DSP board. It could also be a bad U3, WM8569 on the preamp board.
Do you have access to an oscilloscope?
Even with an oscilloscope this is not a simple problem to diagnose.
The quickest solution is to purchase a replacement DSP board.
If its working then could buy it off him..Cool...had a guy pick up his phonic speaker from me and was mentioning to him about the mackie..he says he has a busted one similar model giving a distorted funny output...he asked me if i wanted parts from it...hoping his dsp board is ok..what you reckon Mr Chips..??
Will try with the other chaps dsp board...if not..not sure if its worth the effort ...building another circuit...not much of a designer i am.... would the crossover sit between 1A and 3A or 1A and 2A? ...maybe i might find online schematics.. if i do manage to get my hands on the other dsp board and it works will let you know...thanks again Mr Chips for all your help...should call you Mr Guru from now...hope we catch up again ..let me know where the crossover would sit between ???? Cheers and God bless mate. You are a legend.If you just want to get the THUMP running without the DSP board, you can design and build an electronic crossover with opamps and just bypass the DSP board.
Get it from him for parts (for a reasonable price, under AUD$50? What is a used working TH-15A worth, AUD$400?).Cool...had a guy pick up his phonic speaker from me and was mentioning to him about the mackie..he says he has a busted one similar model giving a distorted funny output...he asked me if i wanted parts from it...hoping his dsp board is ok..what you reckon Mr Chips..??
Yes would be around $400AUD....just sent him a text...hehehe..Get it from him for parts (for a reasonable price, under AUD$50? What is a used working TH-15A worth, AUD$400?).
If you get lucky you just might get both working again.
Okie.....hmmm.. lets see what comes up ...we done our best thanks to you.. keep up the good work you doin..cheersActually, you wouldn't need U4.
The crossover would fit between TP1 and TP6 and TP7 on the schematic shown on post #30.
The crossover frequency is 3kHz.
The drawback is the EQUALIZER control would be ineffective since this is done by the DSP. Only the LEVEL control would work.
Thread starter | Similar threads | Forum | Replies | Date |
---|---|---|---|---|
Tapco Thump TH-15A Amplifier repair (2) | Technical Repair | 2 | ||
Tapco Thump TH-15A Amplifier repair | Technical Repair | 3 | ||
H | Tapco Thump TH-15A Amplifier repair | Technical Repair | 19 | |
B | Mackie Thump TH-12A Amplifier repair | Technical Repair | 1 | |
Mackie Thump TH-12A Amplifier repair | Technical Repair | 1 |
by Jake Hertz
by Jake Hertz
by Jake Hertz
by Jake Hertz