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SX-626 re-cap, and a couple of questions

Uncle Bambi

Uncle Bambi

Funky Tut
A while ago I rescued a pretty little SX-626 from the recycler's pile. I figured that, if nothing else, I could use the amp/preamp jumpers and the two (:)) speaker plugs that were still installed on the back panel.

At first it was scratchy and didn't have any output on the left side, but De-Oxit fixed all of that. Since the lights pulse with the music (weak main filter cap?) and it has a few bulging caps as well as a handful of the light blue Sanyo caps, I decided to give it a re-cap and restore it to full health. I notice on the schematics that there are a pair of 725 transistors in there, so I'll be replacing them too.

A couple of questions -

1) any other "problem" transistors that I should replace will I'm tearing into it? I see some 2sc497, 2sa497, 2sc732, 2sc945, 2sc983, 2sa1312, and 2sc1344 transistors scattered about, as well as the output 2sc793's and the power supply d313's. I'm inclined to leave them all alone (save the 2sa725's, those are getting replaced)), unless you guys think some of the others might be problem children.

2) I'm going to re-cap the tuner, as many of the caps are light blue Sanyo's. Interesting anomaly, though - the SM shows the tuner board as an AWE-031, but my tuner is an AWE-011. I cannot find any schematics or other documentation for this board...... can anyone point me in the right direction?

Below is my parts list (sans transistors), in case anyone is interested. I'll be replacing the 2sa725's with ksa992's, and have the replacements already doped out for the other transistors if someone thinks it would be wise to replace them, too..

equalizer amp
W21-004 C1 10 16 CEA 10 25 647-UPW1E100MDD6
W21-004 C2 10 16 CEA 10 25 647-UPW1E100MDD6
W21-004 C7 0.47 25 CSSA 0.47 50 667-ECQ-V1H474JLW
W21-004 C8 0.47 25 CSSA 0.47 50 667-ECQ-V1H474JLW
W21-004 C9 3.3 25 CEA 3.3 50 647-UKL1H3R3MDD1TA
W21-004 C10 3.3 25 CEA 3.3 50 647-UKL1H3R3MDD1TA
W21-004 C15 100 35 CEA 100 50 647-UPW1H101MPD
W21-004 C16 100 35 CEA 100 50 647-UPW1H101MPD

control amp
AWG-008 C3 47 50 CEA 47 50 647-UPW1HR47MDD
AWG-008 C4 47 50 CEA 47 50 647-UPW1HR47MDD
AWG-008 C7 47 6 CEA 47 50 647-UPW1HR47MDD
AWG-008 C8 47 6 CEA 47 50 647-UPW1HR47MDD
AWG-008 C11 4.7 25 CEA 4.7 50 647-UPW1H4R7MDD
AWG-008 C12 4.7 25 CEA 4.7 50 647-UPW1H4R7MDD
AWG-008 C19 10 25 CEA 10 25 647-UPW1E100MDD6
AWG-008 C20 10 25 CEA 10 25 647-UPW1E100MDD6
AWG-008 C23 100 6 CEA 100 50 647-UPW1H101MPD
AWG-008 C24 100 6 CEA 100 50 647-UPW1H101MPD
AWG-008 C25 47 50 CEA 47 50 647-UPW1HR47MDD
AWG-008 C26 47 50 CEA 47 50 647-UPW1HR47MDD
AWG-008 C27 2.2 25 CSSA 2.2 50 647-UKL1H2R2MDDANA
AWG-008 C28 2.2 25 CSSA 2.2 50 647-UKL1H2R2MDDANA

power amp
AWH-002 C1 3.3 10 CEA 3.3 50 647-UKL1H3R3MDD1TA
AWH-002 C2 3.3 10 CEA 3.3 50 647-UKL1H3R3MDD1TA
AWH-002 C3 100 50 CEA 100 50 647-UPW1H101MPD
AWH-002 C4 100 50 CEA 100 50 647-UPW1H101MPD
AWH-002 C5 3.3 25 CEA 3.3 50 647-UKL1H3R3MDD1TA
AWH-002 C6 3.3 25 CEA 3.3 50 647-UKL1H3R3MDD1TA
AWH-002 C7 100 50 CEA 100 50 647-UPW1H101MPD
AWH-002 C8 100 50 CEA 100 50 647-UPW1H101MPD
AWH-002 C11 100 6 CEA 100 50 647-UPW1H101MPD
AWH-002 C12 100 6 CEA 100 50 647-UPW1H101MPD
AWH-002 C13 2200 25 ACH-004 2200 35 UPW1V222MHD
AWH-002 C14 2200 25 ACH-004 2200 35 UPW1V222MHD
AWH-002 C21 100 50 CEA 100 50 647-UPW1H101MPD

power supply
AWR-006 C5 100 35 CEA 100 50 647-UPW1H101MPD
AWR-006 C9 330 25 CEA 330 50 647-UPW1H331MPD6
AWR-006 C10 330 25 CEA 330 50 647-UPW1H331MPD6
AWR-006 C12 100 16 CEA 100 50 647-UPW1H101MPD

tuner
AWE-011 C23 4.7 25 CEA 4.7 50 647-UPW1H4R7MDD
AWE-011 C27 1 50 CEA 1 50 UKL1H010MDDANATD
AWE-011 C29 4.7 25 CEA 4.7 50 647-UPW1H4R7MDD
AWE-011 C30 1 50 CEA 1 50 UKL1H010MDDANATD
AWE-011 C33 100 16 CEA 100 50 647-UKL1H3R3MDD1TA
AWE-011 C36 10 16 CEA 10 25 647-UPW1E100MDD6
AWE-011 C38 0.47 50 CEA 0.47 50 667-ECQ-V1H474JLW
AWE-011 C45 10 16 CEA 10 25 647-UPW1E100MDD6
AWE-011 C53 0.47 25 CSSA 0.47 50 667-ECQ-V1H474JLW
AWE-011 C54 4.7 25 CEA 4.7 50 647-UPW1H4R7MDD
AWE-011 C55 3.3 16 CSSA 100 50 647-UKL1H3R3MDD1TA
AWE-011 C57 3.3 16 CSSA 100 50 647-UKL1H3R3MDD1TA
AWE-011 C58 1 50 CEA 1 50 UKL1H010MDDANATD
AWE-011 C61 0.47 50 CEA 0.47 50 667-ECQ-V1H474JLW
AWE-011 C65 100 16 CEA 100 50 647-UKL1H3R3MDD1TA
AWE-011 C66 2.2 16 CSSA 2.2 50 647-UKL1H2R2MDDANA
AWE-011 C67 2.2 16 CSSA 2.2 50 647-UKL1H2R2MDDANA
AWE-011 C73 47 16 CEA 47 50 647-UPW1HR47MDD


main power cap 3300 63v 6800 63 647-LLS1J682MELC
 
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Ok.... Almost done. I've pulled the 2sa725 transistors from the tone control board and I've recapped everything but the amplifier board, and this little receiver is sounding very nice.

I was very happy to see some good results with doing the tuner. It was chock-full of the little pale blue Sanyo's, and wasn't pulling stations in too well. Now it's nice and strong.

I know that re-capping a tuner is fraught with danger if you don't have the skills and equipment to align if necessary, but reading archived posts about the blue Sanyo caps led me to believe I didn't have too much choice..... besides, this little guy really is isn't worth much so I wasn't risking a whole lot. Did I get lucky? Yeah, probably. But I'm sure glad I did it. :)
 
Hello everyone!

is it just me or is there an Error for the UKL1H3R3MDD1TA in the tuner awe-011???

I ordered this list, I am recapping and I do not have any 100uf capacitors like on my board but 2x UKL1H3R3MDD1TA.

below you can see that UKL1H3R3MDD1TA is, at the same time 3.3uf and 100uf.

Is the list ok or am I missing something?

thanks

tuner
AWE-011 C23 4.7 25 CEA 4.7 50 647-UPW1H4R7MDD
AWE-011 C27 1 50 CEA 1 50 UKL1H010MDDANATD
AWE-011 C29 4.7 25 CEA 4.7 50 647-UPW1H4R7MDD
AWE-011 C30 1 50 CEA 1 50 UKL1H010MDDANATD
AWE-011 C33 100 16 CEA 100 50 647-UKL1H3R3MDD1TA
AWE-011 C36 10 16 CEA 10 25 647-UPW1E100MDD6
AWE-011 C38 0.47 50 CEA 0.47 50 667-ECQ-V1H474JLW
AWE-011 C45 10 16 CEA 10 25 647-UPW1E100MDD6
AWE-011 C53 0.47 25 CSSA 0.47 50 667-ECQ-V1H474JLW
AWE-011 C54 4.7 25 CEA 4.7 50 647-UPW1H4R7MDD
AWE-011 C55 3.3 16 CSSA 100 50 647-UKL1H3R3MDD1TA
AWE-011 C57 3.3 16 CSSA 100 50 647-UKL1H3R3MDD1TA
AWE-011 C58 1 50 CEA 1 50 UKL1H010MDDANATD
AWE-011 C61 0.47 50 CEA 0.47 50 667-ECQ-V1H474JLW
AWE-011 C65 100 16 CEA 100 50 647-UKL1H3R3MDD1TA
AWE-011 C66 2.2 16 CSSA 2.2 50 647-UKL1H2R2MDDANA
AWE-011 C67 2.2 16 CSSA 2.2 50 647-UKL1H2R2MDDANA
AWE-011 C73 47 16 CEA 47 50 647-UPW1HR47MDD
 
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good catch!! got past me HOW? many times....

my only defense, I didn't write that list,
nor have I come up with appropriate replacement transistors
replacement transistors are POSITION specific.
One location could be needing gain'
while another location (SAME Pioneer transistor part number) needs current drive
or heat dissipation - it depends ENTIRELY upon what that position is DOING.

tuner
AWE-011 C23 4.7 25 CEA 4.7 50 647-UPW1H4R7MDD
AWE-011 C27 1 50 CEA 1 50 UKL1H010MDDANATD
AWE-011 C29 4.7 25 CEA 4.7 50 647-UPW1H4R7MDD
AWE-011 C30 1 50 CEA 1 50 UKL1H010MDDANATD


AWE-011 C33 100 16 CEA 100 50 647-UPW1H101MPD


AWE-011 C36 10 16 CEA 10 25 647-UPW1E100MDD6
AWE-011 C38 0.47 50 CEA 0.47 50 667-ECQ-V1H474JLW
AWE-011 C45 10 16 CEA 10 25 647-UPW1E100MDD6
AWE-011 C53 0.47 25 CSSA 0.47 50 667-ECQ-V1H474JLW
AWE-011 C54 4.7 25 CEA 4.7 50 647-UPW1H4R7MDD
AWE-011 C55 3.3 16 CSSA 100 50 647-UKL1H3R3MDD1TA
AWE-011 C57 3.3 16 CSSA 100 50 647-UKL1H3R3MDD1TA
AWE-011 C58 1 50 CEA 1 50 UKL1H010MDDANATD
AWE-011 C61 0.47 50 CEA 0.47 50 667-ECQ-V1H474JLW


AWE-011 C65 100 16 CEA 100 50 647-UPW1H101MPD


AWE-011 C66 2.2 16 CSSA 2.2 50 647-UKL1H2R2MDDANA
AWE-011 C67 2.2 16 CSSA 2.2 50 647-UKL1H2R2MDDANA
AWE-011 C73 47 16 CEA 47 50 647-UPW1HR47MDD
 
I guess I'll resurrect an old thread...wouldn't be the first time. I'm trying to put together a comprehensive parts list for the 626. I have several threads saved with pretty much the same parts list, but for caps only. I've read some comments that point to the replacing of a couple of known-to-be-noisy transistors. And I've read about the .47uF vs 47 uF controversy. But I haven't been able to figure out a working parts list. The one(s) included in this thread help the confusion, but only include caps. Is there, as of now, a current parts list? I cannot find one that doesn't include a bunch of caveats after it is posted. Surely someone has this already?
 
hey tmab I'm about to work on one too. In comparing the different models it seems like most parts are similar, with later parts (1973) getting beefed up a bit in voltages. Raising cap voltage tolerance is common practice here. I havent found any glaring changes in cap values yet. There is discussion about transistors, but most are stock stuff. I have a note to raise the trimmers V1,2 to 50k. Dlucy added many resistors to his list, although it might be for reasons of getting quieter with metal films. I like to boost the wattage of any power resistors that get hot. I guess it boils down to just how comprehensive you want to be.
 
Hey, tusntuk2, yes dlucy's list is very comprehensive, and everything is not necessary unless you're going for a thorough overhaul. I ordered the whole list, fully expecting that some things (for the tuner, for example) just won't be done.
 
tusntuk2 said:
Why not do the tuner? Those caps are just as old.
Click to expand...

When recapping, you should definitely include the tuner. Just stick to the original capacitance values. Returning the capacitance values to stock condition should not necessitate re-aligning the tuner.
 
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tusntuk2 said:
I was also going to increase the output (coupling) caps to 3300uf
Click to expand...

Increasing the capacitance of the output caps will alter or can the frequency response. In the hk 330B that I first tried that on, the bass response got emphasized. FYI
 
From other threads I had read it seemed like a good idea. i don't have the receiver yet, so it has not been tried yet. General consenus was favorable,
 
dlucy said:
Increasing the capacitance of the output caps will alter or can the frequency response. In the hk 330B that I first tried that on, the bass response got emphasized. FYI
Click to expand...

tusntuk2 said:
From other threads I had read it seemed like a good idea. i don't have the receiver yet, so it has not been tried yet. General consenus was favorable,
Click to expand...

Yep, that's one of the best parts of AK: numerous opinions and plenty of interesting ideas to try out or improve on. Give it a try an d report back with how you like it. Rock on!
 
I have a 626 in my current rotation, and it already has plenty of bass. I have bumped up input caps wjen I recap a KA-3500 to get more bass, but my little 626 already has more then plenty. ( Well, I can't help it, I'm a bass player!)

Think I should stick with the 2200uf spec output caps?
 
For me, I would be considering:

  • 2200 uF 25 V (low) Nichicon KL series (best for audio) 647-UKL1E222KHD $2.13 each
  • 2200 uF 35 V (safer) Nichicon KL series (best for audio) 647-UKL1V222KHD $3.22

If you wanted to try more capacitance, you're only risking a little money:

  • 3300 uF 25 V (low) Nichicon KL series (best for audio) 647-UKL1E332KHD at $3.22 each
  • 3300 uF 25 V (low) Nichicon KA series 647-UKA1E332MHD at $2.24 or Nichicon KW series 647-UKW1E332MHD $1.84 each
  • 3300 uF #5 V (safer) Nichicon KA series 647-UKA1V332MHD $2.74 each
So, worst case, if you buy a set of 2200 and a set of 3300, you're out ~$6-$7.
 
Hey great, thanks Doug! Sometimes I do try things, like my very first project - recapping a Pioneer SX-727. I got it for $25, new parts were about $20, and I figured that even if I totally screwed up and it burned on the bench, that the education was cheap! It started this wonderful hobby. Oh, the 727 turned out to be awesome, and a great education, to boot.

I think I did jot down the 3300/35v UKA. Another AK'er had said it fit the PCB.

Thanks to your advice, I'll get another set of 2200's for comparison. Cheap education, right?
 
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