gslettum

The Brown glue most come off all over the amp. You have a pwr board next to two main capacitators? This can also be faulty, and mayby two mosfet transistores. Located next to the main transformer. On the pwr board you have a Black og blue db6 diac. This has been broken on a few amp's that i have worked on, an the mosfet on the primary side. This pcb board can be tricky to work on if you don't have a good soldersucker. Best to use vacuumtype. The eylets breaks easy and it's two layer board.

Check the 7805 regulator, U13. I had all the correct voltages. Still no display, just flashes when i turned the sub off.

Found at last the fault. 7805 V regulator in pre board was putting out only 1,5 V. New regulator and the display come alive and the rest followed😁

Hello I have a klipsch rw10d with no sound or light om the display. I have changed the db6 diac and the mosfet. And now the Powerboard has 08.1 V output. I put the plateamp together. I have changed all the caps om outputboard and inputboard. Still no light om the displayet or signal on the scoope from the outputboard. Any idea off what else can be wrong? Bashboard maybe?

Getting there

I have recaped the whole secondary side of the board all ready, small caps too the big one. So next on the agenda is the bash. Not sure what kind of UC3842 i can order. https://no.mouser.com/Semiconductors/Power-Management-ICs/Voltage-Regulators-Voltage-Controllers/Switching-Controllers/_/N-41fau?P=1z0z7ptZ1z0vnjaZ1z0z7v5&Keyword=uc3842&FS=True

Changed then anyway, for smd soldertraining😁. And all the diodes. I got power too the secondary side now, but have unstable 13-15 unstable volt at the CD+ and -. And the Q4 2sn4401 made some noise, and broke down. Any idea? Bashboard?

Thanks. So many different subwoofer brands used this amp, and now schematics around. Good kept secret, more secret then some gouverment documents😁

I have changed the IC and the bas16 D3. Still nothing. So for the fun of it and usefully experience, i will rebuild the board. Have all the parts on hand, except the cap's and resistors. I will check the datasheet for the IC.

Nobody knows the vdc on theese small caps. I can't get power too the secondary side. I think i have too rebuild the whole board. Everything else on the primary side is changed.

Theese small smd caps.

Any idea what the dc are on theese caps? Glenn

Work in progress. I don't have fully working power supply, so take some time for a beginner like me. This belongs to a svs pc13 ultra, Bash 750w amp. Same supply as my polk dsw3000 micropro sub. Only difference is the inrushboard.

Anyone knows the vdc on the capacitors on the pwr board 660541-01?

This is from my indigo 640047, rev 3 board. Glenn