Search results

Got it, thanks for helping me locate one.

This one on your Amazon link is a 15 amp thermal fuse. Shouldn't it be a 10 amp? My Pioneer schematic shows it as being a 10 amp thermal fuse. Is the schematic wrong?

What I am saying is with your drawing it is impossible to know what base goes to what transistor and same with the collectors. There are 2 transistors and one is NPN and the other is PNP. In your drawing, there is no way to tell which is which. Anyway, the drawing is very confusing. LesE's...

Well now that is more like it. The other drawing is not correct. Thank you LesE

Yes, but looking at the transistors, why are the bases connected directly to the collectors? Makes no sense to me.

If you look at my post again, you can see that it was addressed to 'kevzep" not to you. Where did you find those heat sinks? I might try them.

Turning the volume up won't affect the temperature of the regulators. Very very little if any at all. Is there room for 2 more regulators on each heat sink? I am going to relocate all 6 of the power supply regulators in my SX-1980.

In your photos, are those heat sinks on the back panel?

Looking at your drawing of the perfboard layout. Doesn't make sense to me. Why are the transistors base and collectors connected together. And are those diodes or led's? What am i missing here? Is it possible to post a better schematic of this mod?

mattsd, Apparently you have never looked at the schematic or the inside of a SX-1980, because had you looked, it is clear that C43 and C46 are identical caps. Both of those caps are CEANL. C43+ to pin 12 of PA1002A left channel out....C46+ to pin 5 of PA1002A right channel out!! Your list is...

I find that using these cap lists is too time consuming because there are too many mistakes. I will just have to compare the caps in the manual to the caps on the unit. For instance, on the tuner board cap list, C43 and C46 are identical caps but the list gives them different part numbers...

Do you have a list of caps for the AWE-093 tuner board?

Mark, thank you sir!

mattsd, about the 22,000 @ 100 volts filter capacitors, which caps did you replace them with? Mouser has them but the only ones I see are 65X105 mm. I need the 76x105 mm caps which are 3 inch diameter.

Yes I did a search in the Pioneer forum, din't find anything with a BOM.

Sorry, I meant to say SX-1980

Looking for a B.O.M. Any of you have one or know where to find one?

Make any progress yet?

You can get 5 of them on the bay for $6.34 Includes shipping. https://www.ebay.com/itm/5Pcs-2SK30A-Transistor-US-Stock-n/132669899155?hash=item1ee3be0193:g:GCoAAOSwP7JbPfoA:rk:1:pf:1&frcectupt=true

Let me know if your fix doesn't work. I can private message you with the link on Ebay.

The 2SK30 transistors are available on ebay. And yes they are reliable.

Yes, a faulty or bad 2sk30 would affect audio in that channel. What makes you think the 2sk30 is bad? If you are referring to the flat amp, I would replace those 2SA725 transistors immediately! Those are definitely a problem. Are the voltages on the two 2sk30 transistors the same?

You must be confusing the 50 series with the 80 series units. The SX-1050 and SX-1250 do not use this chip.

Just make sure you put a 40 watt incandescent light bulb in series with the 120 volt power cord before you turn on the power.

My unit was made April 1977.