Sansui 9090 panel lights

[mainexile]

Help please. I have a Sansui 9090 that works perfectly...except that none of the panel lights or meter lights (except power meters) illuminate. I have 6.5VAC at the power supply and on the equalizer board (F-2541) where the Selector Switch is located, but no voltage on any of the lamps. Any Sansui experts out there?

 

[grateful]

Check fuses and check the source selector switch wafers. The lamps are switched on and off through the selector switch. The high lamp current often burns the contacts.

 

[avionic]

Help please. I have a Sansui 9090 that works perfectly...except that none of the panel lights or meter lights (except power meters) illuminate. I have 6.5VAC at the power supply and on the equalizer board (F-2541) where the Selector Switch is located, but no voltage on any of the lamps. Any Sansui experts out there?

Usually a boat load of bad solder connections.

 

[ryuuoh]

As said, I had bad solder connections on the lamp panel. Reflowed, and I have lights~
Helpful thread:
http://www.audiokarma.org/forums/showthread.php?t=117552

 

[mainexile]

There appear to be no fuses in the path (according to the schematic), and I have voltage coming off the selector switch. Are you familiar with the wiring?

 

[ryuuoh]

Try pressing on the ends of the lamp panel. If your lamps are good, they should light up.

 

[mainexile]

OK. Thanks everyone. I'l try those fixes and hope for the best. Good day to all. Whitey

 

[gonzothegreat]

As suggested by everyone, resolder all suspect solder joints. Add fresh good quality lead solder with plenty of flux - don't just touch up the joints and hope for the best. You may want to take a photo of the area you're working on just in case a tack-soldered wire pops off the PCB.

After that, generously apply deoxit red to the aforementioned switch wafers and spin the selectors until the crud works itself loose. Lather-rinse-repeat.