Yes I was confused on the model.
That unit is nice.
That unit is nice.
I just finished assembled all the circuit parts, unfortunately the amp won't turn on except only those six tubes light up, also can't take the DC voltage result as unstable reading.Yes I was confused on the model.
That unit is nice.
Check the electrolytic capacitors by the AC input.unfortunately the amp won't turn on except only those six tubes light up,
So far Only tubes light up as normal, the amp and meter are not active at all. I m still figure out what's went wrong. Do You have schematic of mk8se?Check the electrolytic capacitors by the AC input.
If you changed them for higher capacitance OR higger voltage, then it will take longer for cap to charge up to turn on.
Does one meter light up?
How to test the PSU? Do I need replace the new one?So none of the meters light up?
The left should have turned on immediately.
You may have similar Problem as another here who had lost connection of PSU center ground to other side of board under area where the big caps and zener diodes are.
The power was at the first big caps, but missing further down.
I most likely the PSU area your Problem.
No, in most cases this is either a board trace open or a single component issue, like the power transistors or the wiring to the board is of, like the transformers.Do I need replace the new one?
Yeah! I suspect PSU problem, will check later. I also found NPN transistor Collector short with ground, cant find out why?No, in most cases this is either a board trace open or a single component issue, like the power transistors or the wiring to the board is of, like the transformers.
If you disconnected the transformer, then you may have reversed one of the primary windings, so that they are in parallel instead of series.
I did that by mistake when swapping out a transformer..
So check that the transformer primary are in series, if you disconnected them from board.
Also, be careful to not get shock when testing. check the bridge rectifiers if you replaced them wrong way..
Check for power at the PSU.
Use the PSU schematic in beginning of thread as it shows the estimated proper voltages.
Transistors washers has been replaced brand new earlier, both have no problem after diodes reading checked several times.The power transistors have tiny washers on the metal case which prevent the body to touch.
It may have broke if you ddn replace.
Or they may be fine as you can only find out by checking voltages .
Checking for short may not be correct if another conpocomp like the diodes are connected.
Plus caps charging.
So best way is to test unit upside down, for checking voltages with unit on & tubes installed.
Must be careful to not cause a short when testing.
If your components are installed correctly and not higher value electrolytics by the delay circuit , then it would be the board trace.
Only way to check it to use volt meter for proper voltages and see where the power stops.
Read back on the PSU issues.
Transformer at last fixed, amp meter light work normal however 0 reading and no sound LOLI never checked the ohm of the transformer so I dunno.
I forgot what the green was for but you can check the schematic that SonicTrance posted.
Observe if you hear relay click when second meter turns on.Transformer at last fixed, amp meter light work normal however 0 reading and no sound LOL