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Old 1st December 2006, 08:20 PM   #1
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Question Pioneer amplifier SA-1270?

Looking for a schematic. Can anyone help me?

I was told it is working, but volume control is (ribbon cable, plus one more) disconnected and RCA input is connected directly to the amp. input socket on the main board , so it is running at full power.

My guess that all is missing - two plastic buttons/extenders on front panel for Volume Control and one for Right Balance. The actual tiny pushbuttons/switches on the board (I can see them) are OK.

No remote control supplied...
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Old 3rd December 2006, 03:22 PM   #2
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Steve
Sounds like a real top-notch tech wannabe got to the unit before you. Did this unit come from Georgetowne Ontario...Just joking....I'd be scoping out ebay for a parts donor. I have no idea if OEM parts are still available??Is it a motorized volume control?
If you need one check this out.http://www.altronics.com.au/index.as...=item&id=K5026
Well keep your stick on the ice we are all in this together.LOL

Dave
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Old 6th December 2006, 07:55 PM   #3
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Dave,

The volume control is pushbuttons (up/down), no motor.
Parts, I beleive, are still available from Pioneer service center, but very expensive (Google for SA-1270).

The amp uses one pair 2SA1302/2SC3281 per channel, all transistors, 2 Mitsubishi chips (maybe opamps) and
input selector TC9164N (Toshiba). On the negative side, it has only 2 electrolytics in the power supply - Elna 8,200 mkf, 71 V.
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Old 6th December 2006, 10:19 PM   #4
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Steve
So have you tried putting it back to original configuration to at least check if the volume control still functions?

Dave
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Old 6th December 2006, 10:43 PM   #5
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Yes, I reconnected the ribbons to the main board. The VC is functional, because I see bargraph power meter is progessing. Apparently, PM is controlled by pushbuttons - not by actual input signal, because embedded Spectrum Analyzer is barely moving. No signal out to speaker. All LEDs are functional.
I suspect, I need to probe signal around input selector IC. Someone on Internet was asking about this chip too.
But, it is just a toy for me, not a priority.
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