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Author Topic: Req: Schematic or Service manual for technics(panasonic) SA-EX140 Receiver  (Read 1832 times)
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Alienbeing
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« on: August 12, 2008, 05:56:30 05:56 »

Looking for a schematic or service manual for a Technics(Panasonic) SA-EX140 stereo receiver. It does not completely turn on. I hear the relay inside switch on and have as far as I can tell all supply voltages. But no digital display on front panel and no sound output. I did find a burned resistor and can probably find what caused it to burn up by I don't know what the value of that resistor is. So, maybe some here can help if the have a schematic of this thing. I know it's old but it did provide good sound for the outdoor parties. Looks like it could be a easy fix. The hybrid IC Power amp module I think is OK as there is no DC on the output channels. I think the problem was one of the driver transistors to it failed.
Well anyway if anyone can help it would be greatly appreciated. I checked most of the free schematic/user manual site I have and had no luck.

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Alienbeing
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marty.markoh
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« Reply #1 on: December 18, 2008, 06:59:57 18:59 »

R U still looking for upp specified schematics(Service Manual)?There it is in attach!-Enjoy
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Regards...
mARTy
« Last Edit: December 18, 2008, 07:52:46 19:52 by marty.markoh » Logged
Alienbeing
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« Reply #2 on: December 19, 2008, 01:51:27 01:51 »

Thanks,
I ran across a service manual for it acouple weeks ago on ebay. Strange I searched on there and someone actually had one for bidding. Paid $9.00 for it but was worth it I guess. Fixed the stereo but not completely as now I find it's not receiving FM. Gets AM fine and both use the same PLL for tuning. So looking like the RF amplifier (FET) is blown but not sure yet. Between the source and drain I measuring about 90 ohms. It's not connected across any coils or transformers so thats not causing the low resistance. Just not sure whether 90 ohms is normal or not.  Seems way to low to me. I'll download these anyways as it's good to have them in a format for computer viewing.

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Alienbeing
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