Pioneer SX-950 recap question

Hello I have recapped all the boards except the Power amp board. It sounds really good. But I am anxious to complete the project and do the amp board
I have couple of questions. I used the following list. Is this list correct? Anything else that should be done? My other question is that the power amp board on the list is noted as (AWH 059) and my amp board says AWH 050? is there a difference? Also I have matched Q1 & Q3...and Q2 and Q4 within 10 HFE will that be good?
Also VR1 & Vr2 multi offset on the list below say 1K ohm and in the manual say 1K but on the board there are 66Z 10K ohm B. Vr3 & Vr4 match the board and this list and the manual.
I corrected the BOM list below which worked out great for me. Except did not include the additional parts for the AWH 050 - or AWH 059 (same thing) but I did include the additional parts near the end of AWH -059 section below. Worked great for me - with no issues.

Thanks in advance for your comments


Pioneer SX-950 recap list (Updated 7/31/14)

Equalizer Amp Assembly (AWF-011)

AWF-011: C1: 1uF 25v CSSA: 647-UKL1H010KDDANA 1uF 50v
AWF-011: C2: 1uF 25v CSSA: 647-UKL1H010KDDANA 1uF 50v
AWF-011: C7: 330uF 6.8v CEA: 667-EEU-FM1C331 330uF 16v
AWF-011: C8: 330uF 6.8v CEA: 667-EEU-FM1C331 330uF 16v
AWF-011: C11: 3.3uF 25v CEANL: 647-UKL1H3R3KDDANA 3.3uF 50v
AWF-011: C12: 3.3uF 25v CEANL: 647-UKL1H3R3KDDANA 3.3uF 50v
AWF-011: C17 100uF 35v CEA: 667-EEU-FM1H101 100uF 50v
AWF-011: C18 220uF 25v CEA: 667-EEU-FM1V221 220uF 35v

AWF-011: Q1: 2SA725: 512-KSA992FBU
AWF-011: Q2: 2SA725: 512-KSA992FBU
AWF-011: Q3: 2SC1313: 512-KSC1845FTA
AWF-011: Q4: 2SC1313: 512-KSC1845FTA
AWF-011: Q5: 2SC1313: 512-KSC1845FTA
AWF-011: Q6: 2SC1313: 512-KSC1845FTA

If the B version:

AWF-011: C??: 100uF 6.3v CEA: 667-EEU-FM1A101 100uF 10v
AWF-011: C??: 100uF 6.3v CEA: 667-EEU-FM1A101 100uF 10v

Switch Assembly Board (AWS-094)

AWS-094: C1: 220uF 6.8v CEA: 667-EEU-FM1V221 220uF 35v

Flat Amp Board (AWG-038)

AWG-038: C1: 2.2uF 50v CEANL(NL): 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-038: C2: 2.2uF 50v CEANL(NL): 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-038: C5: 4.7uF 50v CEANL(NL): 647-UKL1J4R7MDD 4.7uF 63v
AWG-038: C6: 4.7uF 50v CEANL(NL): 647-UKL1J4R7MDD 4.7uF 63v
AWG-038: C13: 220uF 35v CEA: 667-EEU-FM1V221 220uF 35v
AWG-038: C14: 220uF 35v CEA: 667-EEU-FM1V221 220uF 35v
AWG-038: C17: 10uF 25v CSZA: 647-UKL1E100KDDANA 10uF 25v
AWG-038: C18: 10uF 25v CSZA: 647-UKL1E100KDDANA 10uF 25v
AWG-038: C23: 4.7uF 50v CEANL(NL): 647-UKL1J4R7MDD 4.7uF 63v
AWG-038: C24: 4.7uF 50v CEANL(NL): 647-UKL1J4R7MDD 4.7uF 63v
AWG-038: C25: 100uF 10v CEANL(NL): 647-UKL1A101KEDANA 100uF 10v
AWG-038: C26: 100uF 10v CEANL(NL): 647-UKL1A101KEDANA 100uF 10v
AWG-038: C27: 100uF 50v CEA: 667-EEU-FM1H101 100uF 50v

AWG-038: Q1: 2SC1885: 512-KSC2383YTA
AWG-038: Q2: 2SC1885: 512-KSC2383YTA
AWG-038: Q5: 2SA725: 512-KSA992FBU
AWG-038: Q6: 2SA725: 512-KSA992FBU

Tone Amp Board (AWG-039)

AWG-039: C13: 2.2uF 25v CSZA: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-039: C14: 2.2uF 25v CSZA: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-039: C15: 2.2uF 25v CSZA: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-039: C16: 2.2uF 25v CSZA: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-039: C19: 100uF 10v CEANL(NL): 647-UKL1A101KEDANA 100uF 10v
AWG-039: C20: 100uF 10v CEANL(NL): 647-UKL1A101KEDANA 100uF 10v
AWG-039: C21: 47uF 35v CEA: 667-EEU-FC1V470 47uF 35v
AWG-039: C22: 47uF 35v CEA: 667-EEU-FC1V470 47uF 35v
AWG-039: C23: 2.2uF 25v CSZA: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-039: C24: 2.2uF 25v CSZA: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-039: C25: .22uF 35v CSZA: 667-ECQ-V1H224JL2 .22uF 50v
AWG-039: C26: .22uF 35v CSZA: 667-ECQ-V1H224JL2 .22uF 50v
AWG-039: C29: 10uF 25v CSZA: 647-UKL1E100KDDANA 10uF 25v
AWG-039: C30: 10uF 25v CSZA: 647-UKL1E100KDDANA 10uF 25v

AWG-039: Q1: 2SC1312: 512-KSC1845FTA
AWG-039: Q2: 2SC1312: 512-KSC1845FTA

Power Amp Board (AWH-059 -SX 850 & AWH 050 -SX 950) (Q1 and Q3 & Q2 and Q4 should be gain matched)

AWH-059: C1: 2.2uF 25v CSSA: 647-UKL1H2R2KDDANA 2.2uF 50v
AWH-059: C2: 2.2uF 25v CSSA: 647-UKL1H2R2KDDANA 2.2uF 50v
AWH-059: C3: 1uF 25v CSSA: 647-UKL1H010KDDANA 1uF 50v
AWH-059: C4: 1uF 25v CSSA: 647-UKL1H010KDDANA 1uF 50v
AWH-059: C5: 33uF 16v CEA: 667-EEU-FM1V330 33uF 35v
AWH-059: C6: 33uF 16v CEA: 667-EEU-FM1V330 33uF 35v
AWH-059: C11: 330uF 10v CEA: 667-EEU-FM1C331 330uF 16v
AWH-059: C12: 330uF 10v CEA: 667-EEU-FM1C331 330uF 16v

AWH-059: Q1: 2SA726: 512-KSA992FBU
AWH-059: Q2: 2SA726: 512-KSA992FBU
AWH-059: Q3: 2SA726: 512-KSA992FBU
AWH-059: Q4: 2SA726: 512-KSA992FBU

I also ordered theses parts as per TSD71's schematic below in this thread. Just follow the diagram. My thought was might as well get it all while I was in there. The times two or four is how many you will need since there are two sides. that are the same. It worked out very well.
Q5: 512 KSA 1381 (x2)
Q9: 512 KSC2073 (x2)
Q7: 512 KSC3503 (x2)
Q11: 512 KSA940 (x2)
Diode - 1N4004 (x4)
Diode - 1N 4148 (x4)
MJ21193g (x4)
MJ21194G (x4)

VR1: 10K ohm multi offset: 652-3266P-1-103LF VR1,2 offset 10k 12 turn - correct
VR2: 10K ohm multi offset: 652-3266P-1-103LF VR1,2 offset 10k 12 turn - correct
VR3: 100 ohm single bias: 652-3386H-1-101LF 100 ohm single turn
VR4: 100 ohm single bias: 652-3386H-1-101LF 100 ohm single turn

Protection Circuit Assembly (AWM-062)

AWM-062: C1: .22uF 10v CSSA: 667-ECQ-V1H224JL2 .22uF 50v
AWM-062: C2: .22uF 10v CSSA: 667-ECQ-V1H224JL2 .22uF 50v
AWM-062: C3: 330uF 6.8v CEA: 647-UPW1A331MPD 330uF 10v
AWM-062: C4: 330uF 6.8v CEA: 647-UPW1A331MPD 330uF 10v
AWM-062: C5: 4.7uF 25v CEA: 647-UPW1V4R7MDD 4.7uF 35v
AWM-062: C6: 100uF 16v CEA: 647-UPW1V101MPD 100uF 35v

AWR-062: Q1: 2SC869: 512-KSC1845FTA
AWR-062: Q2: 2SC869: 512-KSC1845FTA
AWR-062: Q6: 2SC945: 512-KSC2383YTA
AWR-062: Q7: 2SC1318: 512-KSC2690AYS
1N4004 flyback diode is added between pins 9 (anode) and 10 (cathode)

Power Supply Board (AWR-101)

AWR-101: C10: 470uF 80v ACH-038 (Snap-in): 667-ECO-S1KP681BA 680uF 80v
AWR-101: C11: 470uF 80v ACH-038 (Snap-in): 667-ECO-S1KP681BA 680uF 80v
AWR-101: C12: 2200uF 35v ACH-039 (Snap-in): 667-ECO-S1HA222BA 2200uF 35v
AWR-101: C13: 1000uF 25v CEA: 647-UPW1V102MHD 1000uF 35v
AWR-101: C14: 220uF 10v CEA: 647-UPW1C221MPD 220uF 16v
AWR-101: C15: 470uF 63v CEA: 647-UPW2A471MHD 470uF 100v
AWR-101: C16: 47uF 16v CEA: 647-UPW1E470MDD 47uF 25v
AWR-101: C18: 47uF 50v CEA: 647-UPW1J470MPD 47uF 63v
AWR-101: C19: 47uF 35v CEA: 647-UPW1H470MED 47uF 50v
AWR-101: C20: 100uF 63v CEA: 647-UPW2A101MHD 100uF 100v
AWR-101: C21: 47uF 16v CEA: 647-UPW1E470MDD 47uF 25v
AWR-101: C23: 100uF 35v CEA: 647-UPW1H101MPD 100uF 50v

AWR-101: Q1: 2SD313: 863-MJE15032G
AWR-101: Q2: 2SB507: 863-MJE15033G
AWR-101: Q3: 2SC1318: 512-KSC2383YTA
AWR-101: Q4: 2SA720: 512-KSA1013YBU
AWR-101: Q5: 2SC1318: 512-KSC2690AYS
AWR-101: Q6: 2SA720: 512-KSA1013YBU
AWR-101: Q7: 2SC1318: 512-KSC2383YTA
AWR-101: Q8: 2SD313: 863-MJE15032G
AWR-101: Q9: 2SD313: 863-MJE15032G
AWR-101: Q10: 2SC869: 512-KSC2383YTA

BOM List:

647-UKL1H2R2KDDANA | 10
647-UKL1H010KDDANA | 4
647-UKL1H3R3KDDANA | 2
647-UKL1J4R7MDD | 4
647-UKL1A101KEDANA | 4
647-UKL1E100KDDANA | 4
667-EEU-FM1C331 | 4
667-EEU-FM1H101 | 2
667-EEU-FM1A101 | 2
667-EEU-FM1V221 | 4
667-EEU-FM1V330 | 2
667-EEU-FC1V470 | 2
667-ECQ-V1H224JL2 | 4
667-ECO-S1KP681BA | 2
667-ECO-S1HA222BA | 1
647-UPW1A331MPD | 2
647-UPW1V4R7MDD | 1
647-UPW1H101MPD | 1
647-UPW1V101MPD | 1
647-UPW2A101MHD | 1
647-UPW1V102MHD | 1
647-UPW1C221MPD | 1
647-UPW2A471MHD | 1
647-UPW1E470MDD | 2
647-UPW1J470MPD | 1
647-UPW1H470MED | 1
863-MJE15032G | 3
863-MJE15033G | 1
512-KSA992FBU | 8
512-KSC1845FTA | 8
512-KSC2383YTA | 6
512-KSA1013YBU | 2
512-KSC2690AYS | 2
652-3386H-1-101LF | 2
652-3266P-1-103LF | 2

My other question is that the power amp board on the list is noted as (AWH 059) and my amp board says AWH 050?

Click to expand...

the service manual says AWH-050, so AWH-059 is a mistake
the service manual says 10k for vr1,2
652-3266P-1-103LF VR1,2 offset 10k 12 turn
check your pcb, what does it say on the part?

The one currently in place pcb part says 10k - so then I need to order
652-3266P-1-103LF VR1,2 offset 10k 12 turn instead of the one I have
652 -3296F correct?

Is there anything else on the amp board that should be replaced while I am at it? I have only replaced whats on the list as instructed

Pics awh 050

Here is a pic of AWH 050 Power amp board. Like I said anything else I should replace on other than whats on the list. I would also like ot buy a manual from one of the members who sells them or a sponsor. Looked on the site but cannot find one - any directional help would also be grateful

950 Manual

Here is a pic of the 950 manual so it must be a misprint - I looked at other threads on AK that have the manual and they show the same 1K at VR 1 & 2. My question is when I order the correct part - is there anything else I should replace while I am in there, other that whats on the list above under Power amp board. Thanks - Please respond (132) looks and one response?

Replace everything that I have notated on the schematic, don't nickel and dime a great receiver with potential for years of enjoyment. Both left and right sides are the same, the 850 is the same as the SX-950 on the amp board. Gain match the KSA992's on both sides. Replace the variable resistors also with:

VR1: 10K ohm multi offset: 652-3386P-1-103LF multi turn
VR2: 10K ohm multi offset: 652-3386P-1-103LF multi turn
VR3: 100 ohm single bias: 652-3386H-1-101LF 100 ohm single turn
VR4: 100 ohm single bias: 652-3386H-1-101LF 100 ohm single turn

Gain match

I will follow your schematic TY. I matched the HFE within 10 HFE for the KSA992's is that considered within specification and is HFE a good way to match? - Thanks again

pthielen said:

I will follow your schematic TY. I matched the HFE within 10 HFE for the KSA992's is that considered within specification and is HFE a good way to match? - Thanks again

Click to expand...

yes, good luck

Thank you

Will let you know how it works out - Thanks Phil

I matched the HFE within 10 HFE for the KSA992's is that considered within specification and is HFE a good way to match?

Click to expand...

match by Vbe!! to minimize dc offset for a differential pair. use your dmm set for the diode test function, to test the b/e junction

SX 950 up and running

Thanks for your help. Followed your schematic. The SX-950 found in the Garbage bin is up and sounding nice. Thanks for all your help Pictured attached

Nice!

pthielen said:

Thanks for your help. Followed your schematic. The SX-950 found in the Garbage bin is up and sounding nice. Thanks for all your help Pictured attached

Click to expand...

Love it great news!

pthielen;
You said;
"My other question is that the power amp board on the list is noted as (AWH 059) and my amp board says AWH 050?"

The AWH-59 Power Amplifier Assembly board is found in a SX-850 has the same stuff (minus the finals) as the AWH-050 Power Amplifier Assembly board does in the SX-950.
Bob Helms

Thanks for all your help guys the 950 truly sounds great. During my rebuild. There were a few things that could confuse someone. Such as in my 950 manual (& on the above BOM list) its say 1k for the potentiometer at VR1 & VR3 when it should be 10k ( glad I checked). Everything else is easily found searching AK using the search feature found here. I also noticed when setting VR3 & VR4 for 20MV. When I first hooked up the leads from my VM to the amp board. I hooked up VM + red lead to to the neg (13) and VM - black to the Pos (12) well this of course gave a neg reading on the VM. I was puzzled for about 5 minutes until I went back and checked. Reversed the VM leads and it was fine. But by taking my time, reading AK Posts about the rebuild and double checking my work after a board was complete worked out well. Also asking questions no matter how I felt about it and finally getting a good solid answer. Thanks again AK members for you help