It should NOT come out of protection with the left channel amplifier output at 54 volts. Check your transistor lead id's.
Pioneer sx1010 troubles
- Thread starter Oscar23
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It should NOT come out of protection with the left channel amplifier output at 54 volts. Check your transistor lead id's.
On the protection board, I found that weird to
yes I know that post
I was originally talking about checking the amp board, but the protection also bears inspection, the picture asked more questions than it answered.
from an old post, about installing a transistor:
from an older post:
there's a trick to align them into a triangular hole arrangement
get the layout fixed in your mind - ecb-
get the first lead, in this case the emitter (leftmost lead when leads are pointing down, and lettering (and flat) are facing you.)
then find the emitter hole, and stick the emitter lead in
then find the END lead on the opposite side of the transistor's body,
in this case the base
rotate the transistor using the emitter lead in the hole as the pivot point
rotate until the base lead is lined up on it's hole
put the base lead in the hole
then bend the collector lead in the direction of the leftover (center) collector hole.
insert the collector lead and then while leaving all three leads in their holes
bend all the leads to locate the transistor body towards the center of the triangle
voila...
from an old post, about installing a transistor:
from an older post:
there's a trick to align them into a triangular hole arrangement
get the layout fixed in your mind - ecb-
get the first lead, in this case the emitter (leftmost lead when leads are pointing down, and lettering (and flat) are facing you.)
then find the emitter hole, and stick the emitter lead in
then find the END lead on the opposite side of the transistor's body,
in this case the base
rotate the transistor using the emitter lead in the hole as the pivot point
rotate until the base lead is lined up on it's hole
put the base lead in the hole
then bend the collector lead in the direction of the leftover (center) collector hole.
insert the collector lead and then while leaving all three leads in their holes
bend all the leads to locate the transistor body towards the center of the triangle
voila...
I'd fix the protection board 1st, so that when you fix the railed circuit the protection doesn't cause it to rail again.
Here's my SX-939 board. It's the same board as used in the 1010. I did replace a few of the transistors in it as I remember. I marked the "E" holes with a White Dot, and the line is the direction of the flat face of the transistor. Triple check the Data sheet for a "Center Collector" or "C" suffix on any and all of them. This would make the pinout left to right ECB Instead of EBC. Look at the part # on the bag and cross check that against the data sheet. You can also check them on your DMM if it has a transistor checker. It won't work if you inadvertantly installed a transistor as an EBC vs an ECB. BTDT a couple times.
Here's my SX-939 board. It's the same board as used in the 1010. I did replace a few of the transistors in it as I remember. I marked the "E" holes with a White Dot, and the line is the direction of the flat face of the transistor. Triple check the Data sheet for a "Center Collector" or "C" suffix on any and all of them. This would make the pinout left to right ECB Instead of EBC. Look at the part # on the bag and cross check that against the data sheet. You can also check them on your DMM if it has a transistor checker. It won't work if you inadvertantly installed a transistor as an EBC vs an ECB. BTDT a couple times.
what did you use to replace the 2sc869's with (2 in the center)? Did you replace all of the transistors on the board??? I can't tell other than the "E" leg is correct on the two center transistors. If you used the board diagram, note that it is the bottom of the board in orientation and you'll need to take that into consideration.
The face orientations look right, but you can get that with the B & C reversed too. So make sure one more time, and if correct, solder them up. I can't see the B & C legs well enough to tell.
buffdriver
Active Member
Your ksc2690 looks correct, as does the polarity of all of your caps. Q1 & Q2 (ksc1845) also look to be in correctly. I noticed that you didn't change out c1 & c2. Probably not the issue, but these are solid aluminum and should be replaced with 0.22uF film caps.
I tried hard to see which transistors you replaced on the edge of the board away from the wire connections, but I couldn't make it out. You said that you replaced Q6 with ksc2383. That should be the transistor adjacent to the 4.7uF cap. Is it possible that you soldered the ksc2383 in somewhere other than Q6 by mistake?
I've uploaded an identical protection board in my SX-737 with the same parts that you used. The ksc2383 is highlighted.
Hope this helps!
I tried hard to see which transistors you replaced on the edge of the board away from the wire connections, but I couldn't make it out. You said that you replaced Q6 with ksc2383. That should be the transistor adjacent to the 4.7uF cap. Is it possible that you soldered the ksc2383 in somewhere other than Q6 by mistake?
I've uploaded an identical protection board in my SX-737 with the same parts that you used. The ksc2383 is highlighted.
Hope this helps!
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I found a pic of my 1010 board after all was said and done. I did NOT replace Q1 & Q2. I did replace Q3-4-5-6-7.
