So I've had the C4S and iron upgrades for a long time, and some other upgrades for Seduction too. They have just been sitting waiting to be installed. I finally decided it was time, and tackled the C4S. I built up both boards, one right after the other, not at the same time. I installed one C4S board into the first amp, and checked the voltage like the manual says. Here are the measurements I got.
15 - .58 vdc - should be 390
left terminal of new terminal strip - .58 vdc - should be 295
B6 - .64 vdc - should be 155
B8 - .66 vdc - should be 2
I grounded out on pin 8, where the ac ground meets the chassis ground.
So I figured I had a bad solder connection, so I double checked everything, and reread the instructions looking for the problem. Nothing found. So I installed the second one in the second amp, and I get the exact same results. So I figured it wasn't a bad solder joint, since both amps were measuring the same. I rechecked my work again, and can't see any issues. The LED's light up, and all the board connections look good. Any ideas where to start? The only common item between the 2 amps was the power cord and the DVM. I check the incoming power where it attaches to the terminal strip, and it was good (114 ish)
Pfenning
Pfenning
Paramour 1's with c4s and iron upgrade, Foreplay II, Seduction with c4s, Crack (stock) and Foreplay III (waiting to be built), DIY turntable with Rega RB250 arm with Incognito wiring, Oppo DVD, Pi Stage 4's and DIY subs