Pioneer SX 1980
 

Does anyone still have the schematic for this old beast laying around?
What i am looking for is a resistor value. There is a 25 watt resistor
just after the power switch on the power supply board. It has a thermal
fuse under it. What i need is the value of the 25 watt resistor.
The one that was in there (and open) was 5 ohms) . It looks like
it was not original and i am suspicious that the value is too high.
Can anyone confirm this resistor value?

Bob


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Hi Bob,

I have an SX-980, and the service manual for it. It only has about 80W
per channel, so the PA and PS must be different. I can check if there is
a similar resistor and what value it has.
BTW, there is a service manual for the SX-1980 on e-bay right now. Are
you the one bidding on it?

Regards, Peter

BOB URZ wrote:

Does anyone still have the schematic for this old beast laying around?
What i am looking for is a resistor value. There is a 25 watt resistor
just after the power switch on the power supply board. It has a thermal
fuse under it. What i need is the value of the 25 watt resistor.
The one that was in there (and open) was 5 ohms) . It looks like
it was not original and i am suspicious that the value is too high.
Can anyone confirm this resistor value?

Bob


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Peter Orban wrote:

Hi Bob,

I have an SX-980, and the service manual for it. It only has about 80W
per channel, so the PA and PS must be different. I can check if there is
a similar resistor and what value it has.
BTW, there is a service manual for the SX-1980 on e-bay right now. Are
you the one bidding on it?

Regards, Peter


No, i am not currently bidding on it. The 1980 is one of those HUGE
beasts that weight a ton and were too big to fit in a standard stereo
cabinet. I think it was 120-160w/ch or so as i recall. Its all working
fine now. But i would like to verify the value of the resistor if i could.
I doubt your unit has the same set up. I think this resistor was put in
line to prevent massive current surge during start up. The unit is so
heavy one guy can barely pick it up.

Bob


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That was 3.3 ohms, 20 watts for the US market, 6.2 ohms, 20 watts for 220
volt markets.

Mark Z.


"BOB URZ" wrote in message
...


Peter Orban wrote:

Hi Bob,

I have an SX-980, and the service manual for it. It only has about 80W
per channel, so the PA and PS must be different. I can check if there is
a similar resistor and what value it has.
BTW, there is a service manual for the SX-1980 on e-bay right now. Are
you the one bidding on it?

Regards, Peter


No, i am not currently bidding on it. The 1980 is one of those HUGE
beasts that weight a ton and were too big to fit in a standard stereo
cabinet. I think it was 120-160w/ch or so as i recall. Its all working
fine now. But i would like to verify the value of the resistor if i could.
I doubt your unit has the same set up. I think this resistor was put in
line to prevent massive current surge during start up. The unit is so
heavy one guy can barely pick it up.

Bob


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