kante1603
Well-known member
Aaaaahhhh.......think I gotcha now!
You said the 24v led went off and the fuse wasn´t broken,that´s why I thought the voltage came back somehow.
O.K.,what you can do is check the 24vdc regulator,from what I remember it is an LM350,yes?
First check if continuity from the M3 screw that holds the reg in place to the metall plate around it (on the reg,not the floorbox metal).
What do you get?
There should be no short or zero ohms readings here (same on all regulators btw.),if yes then you might have overtightened it and damaged the silicone foil behind which must act as on isolator and thermal transfer part.Or the pastic ring surounding the screw is broken.Or both,hahaha......
If this is o.k. then let´s check through the 24v circuit at the basic points:
1.:Set dmm to ac reading.Measure if the transformer is giving you 24vac (ca.27 to 28vac unloaded).
2.:Set dmm to dc reading now.Check the rectified dc voltage prior to the LM350 at its input.For this attach the black probe to a 0vdc point,not safety earth.Measure the input of the regulator on pin 3 (seen from front it is the right pin).You should have a rectified dc voltage here roughly around +33 to 39vdc here.
3.:Check its output at pin 2 which is the middle pin.Should be in the +24vdc area,depends on the trim pot setting.
Up to here so far,please report back.
---------------------------------------------------------------------------------------------------------------------------------------------------------------
Your extender cable question:
You can do them yourself:Get a 51x protoboard and a card edge connector (18 pin version)
from Volker (silent arts) in Berlin or maybe Cemal (sahib) in Glasgow has them too.
Just wire them up,it takes just some minutes,refer to the pinout table for the 51x standard,can be found on the last page of Jeff´s floorbox build manual.
I did three of them meanwhile,the advantage is that you can make them as long as needed and attach different plugs if you want,e.g. I did one version with 4mm banana jacks,one with a 7pin xlr connector etc.
Best regards,
Udo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------
Edit:Here´s a LM350T pinout for your orientation.
You said the 24v led went off and the fuse wasn´t broken,that´s why I thought the voltage came back somehow.
O.K.,what you can do is check the 24vdc regulator,from what I remember it is an LM350,yes?
First check if continuity from the M3 screw that holds the reg in place to the metall plate around it (on the reg,not the floorbox metal).
What do you get?
There should be no short or zero ohms readings here (same on all regulators btw.),if yes then you might have overtightened it and damaged the silicone foil behind which must act as on isolator and thermal transfer part.Or the pastic ring surounding the screw is broken.Or both,hahaha......
If this is o.k. then let´s check through the 24v circuit at the basic points:
1.:Set dmm to ac reading.Measure if the transformer is giving you 24vac (ca.27 to 28vac unloaded).
2.:Set dmm to dc reading now.Check the rectified dc voltage prior to the LM350 at its input.For this attach the black probe to a 0vdc point,not safety earth.Measure the input of the regulator on pin 3 (seen from front it is the right pin).You should have a rectified dc voltage here roughly around +33 to 39vdc here.
3.:Check its output at pin 2 which is the middle pin.Should be in the +24vdc area,depends on the trim pot setting.
Up to here so far,please report back.
---------------------------------------------------------------------------------------------------------------------------------------------------------------
Your extender cable question:
You can do them yourself:Get a 51x protoboard and a card edge connector (18 pin version)
from Volker (silent arts) in Berlin or maybe Cemal (sahib) in Glasgow has them too.
Just wire them up,it takes just some minutes,refer to the pinout table for the 51x standard,can be found on the last page of Jeff´s floorbox build manual.
I did three of them meanwhile,the advantage is that you can make them as long as needed and attach different plugs if you want,e.g. I did one version with 4mm banana jacks,one with a 7pin xlr connector etc.
Best regards,
Udo.
---------------------------------------------------------------------------------------------------------------------------------------------------------------
Edit:Here´s a LM350T pinout for your orientation.
Where do I find a 0VDC point? CHASSIS or GND on the output or something like that? Just want to avoid messing it up.
![[silent:arts]](https://cdn.imagearchive.com/groupdiy/data/avatars/m/0/172.jpg?1620371656){kind=avatar}
