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9090 won't power up

T

tjmarrone

Member
I recently aquired a 9090 that does not power up. In a quick check, there does not appear to be any ac voltage coming back from the power switch.

1) is this common?
2) are there replacements available?
3) if 2 is no, anyone succesfully repaired one?
4) can anyone tell me the best approach to get to it, looks kinda buried in there a ways?

Thanks in advance, T. J.
 
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Did you check your fuses? Mains fuse F701 on the rear panel. Check it with a meter. 10 amp fuse.
 
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Did you try jumpering the switch? You can gain access to the switch by seperating the tuner assembly from the main chassis about 6 or 8 small screws.These switches are rather unique.Theres a few real sansui buffs here that may be able to help you out with a switch from a parts unit.
 
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If it is indeed the switch.You could hard wire it in the closed position and use a switched power strip until you find a replacement.:scratch2:
 
No, haven't tried anything yet, looking for advice first. Access looks really tough, I'll look at you sugestion in the AM of removing the tuner assembly. Thought to ask first and not break something.
 
Easy enough way to test the switch..Unplug the unit from the wall and attach your meters test leads to the power plugs two prongs. Engage the power switch and you should read around 1 ohm,disengage you should read and "open"..If its working correctly..
 
Is this a european model or US model? Does it have a international power selector plug or switch on the rear panel?

1.Open power cord.
2.broken wire(s)/cold solder connections
3 Open fuse/fuse holder contacts corroded or broken
4 (bad power switch contacts)
5 open mains transformer primary winding.
 
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I get power at the reciever where the power cord connects, I get power post the fuse at the wire headed to the power switch, I can't get my teater down to the contacts at the switch itself, but I can't belive thee wire from the rear panel to the switch is bad or that the wire from the switch back to the rear panel is bad. I know I am not getting power to the switched recptacle regardless of what I do. I am really thinking this is a bad power switch, I guess I will bypass it in the AM and see.
 
I know I am not getting power to the switched recptacle regardless of what I do
Click to expand...
1.The switch or..
2 broken wire
only thing it can possibly be.
 
I was afraid someone would ask because I don't have a part number reference but I have seen them in the catalogs. CDfixer gave me a couple he salvaged out of modern computer gear. They are nearly exact replacements right down the the screw mounting holes and plastic tang for the push button cover. Mouser or Digikey should have them. If I have time later I'll do a little digging.

The 0x0x series all use the same one. They are double pole switches with only one pole wired. In most cases you can just swap the wires to the other side. What kills them is too much stuff plugged into the "switched" outlet on the back of the unit.

- Pete
 
Anorher way to check is to measure the AC at the rear utility plugs-one for unswitched and the other switched AC power.

sui-san
 
I have a little desk lamp that I use on the bench. It has a 40watt bulb. Just plug it in to the outlets on the back and it tells you right away what's working.

- Pete
 
What LB says about only using one side is correct, I usually wire both sides together to reduce the load on the switch contacts. If you need one send me a PM and donate $15 to AK and I will send one your way (one switch per member) and I'll pay the shipping. These are new switches that were removed from computer power supplies before they were installed (the computer cases had there own switches).
(I hope it is alright to solicit donations to AK this way)
 
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