Pioneer amplifier SA-1270?

StevenOH · 1st December 2006, 08:20 PM

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...

XEAGLEKEEPER · 3rd December 2006, 03:22 PM

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

StevenOH · 6th December 2006, 07:55 PM

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.

XEAGLEKEEPER · 6th December 2006, 10:19 PM

Steve
So have you tried putting it back to original configuration to at least check if the volume control still functions?

Dave

StevenOH · 6th December 2006, 10:43 PM

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.

1st December 2006, 08:20 PM	#1
StevenOH diyAudio Member Join Date: Jun 2004 Location: USA	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...

3rd December 2006, 03:22 PM	#2
XEAGLEKEEPER diyAudio Member Join Date: Jan 2006 Location: central Iowa	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 __________________ Ret. USAF... AKA- Avionic * Solder slinger for hire...*

6th December 2006, 10:19 PM	#4
XEAGLEKEEPER diyAudio Member Join Date: Jan 2006 Location: central Iowa	Steve So have you tried putting it back to original configuration to at least check if the volume control still functions? Dave __________________ Ret. USAF... AKA- Avionic * Solder slinger for hire...*

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6th December 2006, 07:55 PM	#3
StevenOH diyAudio Member Join Date: Jun 2004 Location: USA	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.

6th December 2006, 10:43 PM	#5
StevenOH diyAudio Member Join Date: Jun 2004 Location: USA	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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