Im adding regs to the dac cpu and servo,Im struggling at the pins i need to add regs on at the dac brent says anything with 5v+ that ok ?
thanks alan
thanks alan
Check the service manual alan. There is a pin description for the dac chip. I think there are 5 or 6 supplies for the dac. Most important will be to pick up a link for digital (L&R) and then analogue (L&R). I can't remember the links but you can follow the tracks to get wire links on the board that can be removed to isolate the ana and dig supplies. I'll try and post a pic later 😉
Bikeral, remove RD04, CD07 & CD06.
Fit a new electrolytic (I recommend Oscon SEPC) in CD06.
Bend the input pin of the 7805 (pin1) or whatever reg up and use the space from CD07 to fit the reg. This gives you the gnd and out.
Run a wire from raw +10v supply and connect to the input of the reg.
That sorts the digital supply for the dac.
Lee.
Fit a new electrolytic (I recommend Oscon SEPC) in CD06.
Bend the input pin of the 7805 (pin1) or whatever reg up and use the space from CD07 to fit the reg. This gives you the gnd and out.
Run a wire from raw +10v supply and connect to the input of the reg.
That sorts the digital supply for the dac.
Lee.
Thanks ian lee,
I am picking +12v from u161 near main 5v reg and feed u200 for analog and rd 04 for digital this ok ?.
alan
I am picking +12v from u161 near main 5v reg and feed u200 for analog and rd 04 for digital this ok ?.
alan
Lee what value cap in cd06 and where do i get an oscon from have a few elnas in the parts bin?.
alan
alan
Just a quick update. Yesterday I fitted most of the regs to the board and improved a lot of caps. I also swapped some resistors in the HF feed for some low-noise types (don't know if that did anything, so don't ask).
Today I installed the driver IC regs.
This was sounding great, very detailed and dynamic as expected.
Lee.
Today I installed the driver IC regs.
This was sounding great, very detailed and dynamic as expected.
Lee.
Next I hooked up that big psu for the servo, and what a difference. I was shocked by how much the sound improved. Bass became more full and the whole frequency range just became more balanced.
You definitely need to add good sized psu's to the driver ic section. 50va tx and 10,000uF+ smoothers make a huge difference.
Lee.
You definitely need to add good sized psu's to the driver ic section. 50va tx and 10,000uF+ smoothers make a huge difference.
Lee.
