Luxman l-100 adjustment help

[quadmatrix82]

Hi all wondering does anyone know the correct procedure to set the Luxman l-100 power supply voltage? I couldn’t find anything in the service manual or here on AK? Thanks for your help!

 

[cademan]

What is it that you need to set? Are you in a 120 volt or 240 volt country?

 

[sanjib]

Have you looked at this thread?
https://audiokarma.org/forums/index.php?threads/luxman-l-100u-power-supply-issues.556631/

 

[quadmatrix82]

What is it that you need to set? Are you in a 120 volt or 240 volt country?

240v vac I did read that thread, there are 4 pins for c07s-c10s, is it black and red prone on first two and then repeat on third and fourth probe?

 

[quadmatrix82]

Also im

240v vac I did read that thread, there are 4 pins for c07s-c10s, is it black and red prone on first two and then repeat on third and fourth probe?

assuming the plug that sits on those pins is removed when taking measurements?

 

[sanjib]

I never worked on L-100. You are measuring DC voltages on these pins so for each pin you should measure with respect to the chassis ground. You red probe on the pin and black probe on the chassis.

 

[sanjib]

There are four pins 2 pins for +ve rail and the other 2 pins for -ve rail.

 

[sanjib]

Check the attachments in post #3 of the above link and it should be clear to you.

 

[quadmatrix82]

Ok thanks I’ll measure them that way and adjust to 58v, Thankyou

 

[quadmatrix82]

Here is the board waiting on new caps before reassembly rest of the amp is now recapped and freshened up

 

[sanjib]

As I see in the SM, pins 7 & 8 supply the +ve rails and pins 9,10 -ve rails to the input stages of 2 power amps. Output stage rail voltages come directly from the filter caps.

 

[quadmatrix82]

As I see in the SM, pins 7 & 8 supply the +ve rails and pins 9,10 -ve rails to the input stages of 2 power amps. Output stage rail voltages come directly from the filter caps.

I tried to measure the adjustment today and have zero volts at the first left pin 7, none of the relays click with or without the pre in-main out jumpers in. The protection light just flashes so far amp isn’t recapped I couldn’t find any transistor or diodes shorts so will keep looking to see what else could be stray to cause this