SX1010 Static Issue

[RuairiMutt]

I've been slowly working though getting this SX1010 back to life, it was run pretty hard. I've already recapped and replaced out the transistors on the power supply to get that set straight. I also had to replace all the outputs on the left channel as there was a short, which was causing all kinds of issues.

Replacing the outputs brought it semi back to life. It has output again and sounds decent, and the relay no longer kicks itself in and out endlessly.

The issue is, even with no volume, there is a nasty popping, scratching and static sound on the left channel, which I presume is a transistor.

The questions is, which transistor on the driver board would be causing this nasty static scratching and crashing sound?

 

[goat67]

I would replace Q1 and Q3 on the Equalizer amp Assembly

Here is a Parts list.

Muting Assembly (AWM-039-A)


AWM-039-A: C1: .47uF 50v CEA: 667-ECQ-V1H474JL .47uF 50v

AWM-039-A: C2: 47uF 50v CEA: 647-UPW1H470MED 47uF 50v


Q1: 2SC945 ECB 512-KSC2383YTA ECB

Q2: 2SC945 ECB 512-KSC2383YTA ECB

Q3: 2SC1318 ECB 512-KSC2383YTA ECB


Equalizer Amp Assembly (AWF-013-0)


AWF-013-0: C1: 2.2uF 25v CSSA: 647-UKL1H2R2KDDANA 2.2uF 50v

AWF-013-0: C2: 2.2uF 25v CSSA: 647-UKL1H2R2KDDANA 2.2uF 50v

AWF-013-0: C5: 470uF 6.3v CEANL: 647-UKL1C471KPD 470uF 16v

AWF-013-0: C6: 470uF 6.3v CEANL: 647-UKL1C471KPD 470uF 16v

AWF-013-0: C9: 100uF 6.3v CEANL: 647-UKL1E101KPDANA 100uF 25v

AWF-013-0: C10: 100uF 6.3v CEANL: 647-UKL1E101KPDANA 100uF 25v

AWF-013-0: C11: 10uF 10v CEANL: 647-UKL1C100MDDANA 10uF 16v

AWF-013-0: C12: 10uF 10v CEANL: 647-UKL1C100MDDANA 10uF 16v

AWF-013-0: C19: 100uF 25v CEANL: 647-UKL1E101KPDANA 100uF 25v

AWF-013-0: C20: 100uF 25v CEANL: 647-UKL1E101KPDANA 100uF 25v

AWF-013-0: C21: 220uF 16v CEANL: 647-UKL1C221KPDANA 220uF 16v


Q1: 2SA725: BCE 512-KSA992FBU ECB

Q2: 2SA725: BCE 512-KSA992FBU ECB

Q3: 2SA725: BCE 512-KSA992FBU ECB

Q4: 2SA725: BCE 512-KSA992FBU ECB

Q5: 2SC1313: BCE 512-KSC1845FTA ECB
Q6: 2SC1313: BCE 512-KSC1845FTA ECB
Q7: 2SC1313: BCE 512-KSC1845FTA ECB
Q8: 2SC1313: BCE 512-KSC1845FTA ECB


Control Amp Assembly (AWG-027-0) (Check C49-52, can be 100uF 16v instead of 47uF 16v like the manual states)


AWG-027-0: C1: .33uF 25v: CSSA: 667-ECQ-V1H334JL .33uF 50v

AWG-027-0: C2: .33uF 25v: CSSA: 667-ECQ-V1H334JL .33uF 50v

AWG-027-0: C7: 100uF 10v CEA: 647-UPW1E101MED 100uF 25v

AWG-027-0: C8: 100uF 10v CEA: 647-UPW1E101MED 100uF 25v

AWG-027-0: C13: 2.2uF 25v CSSA: 647-UKL1H2R2KDDANA 2.2uF 50v

AWG-027-0: C14: 2.2uF 25v CSSA: 647-UKL1H2R2KDDANA 2.2uF 50v

AWG-027-0: C15: 4.7uF 35v CEA: 647-UPW1V4R7MDD 4.7uF 35v

AWG-027-0: C16: 4.7uF 35v CEA: 647-UPW1V4R7MDD 4.7uF 35v

AWG-027-0: C23: 4.7uF 25v CEANL: 647-UKL1H4R7KDDANA 4.7uF 50v

AWG-027-0: C24: 4.7uF 25v CEANL: 647-UKL1H4R7KDDANA 4.7uF 50v

AWG-027-0: C25: 10uF 16v CEA: 647-UPW1E100MDD 10uF 25v

AWG-027-0: C26: 10uF 16v CEA: 647-UPW1E100MDD 10uF 25v

AWG-027-0: C29: 100uF 10v CEA: 647-UPW1E101MED 100uF 25v

AWG-027-0: C30: 100uF 10v CEA: 647-UPW1E101MED 100uF 25v

AWG-027-0: C31: 4.7uF 35v CEA: 647-UPW1V4R7MDD 4.7uF 35v

AWG-027-0: C32: 4.7uF 35v CEA: 647-UPW1V4R7MDD 4.7uF 35v

AWG-027-0: C39: 4.7uF 25v CEANL: 647-UKL1H4R7KDDANA 4.7uF 50v

AWG-027-0: C40: 4.7uF 25v CEANL: 647-UKL1H4R7KDDANA 4.7uF 50v

AWG-027-0: C41: 10uF 16v CEA: 647-UPW1E100MDD 10uF 25v

AWG-027-0: C42: 10uF 16v CEA: 647-UPW1E100MDD 10uF 25v

AWG-027-0: C45: 100uF 10v CEA: 647-UPW1E101MED 100uF 25v

AWG-027-0: C46: 100uF 10v CEA: 647-UPW1E101MED 100uF 25v

AWG-027-0: C47: 2.2uF 25v CSSA: 647-UKL1H2R2KDDANA 2.2uF 50v

AWG-027-0: C48: 2.2uF 25v CSSA: 647-UKL1H2R2KDDANA 2.2uF 50v

AWG-027-0: C49: 47uF 16v CEA or 100uF 16v CEA: 647-UPW1E470MDD 47uF 25v or 647-UPW1C101MED 100uF 16v

AWG-027-0: C50: 47uF 16v CEA or 100uF 16v CEA: 647-UPW1E470MDD 47uF 25v or 647-UPW1C101MED 100uF 16v

AWG-027-0: C51: 47uF 16v CEA or 100uF 16v CEA: 647-UPW1E470MDD 47uF 25v or 647-UPW1C101MED 100uF 16v

AWG-027-0: C52: 47uF 16v CEA or 100uF 16v CEA: 647-UPW1E470MDD 47uF 25v or 647-UPW1C101MED 100uF 16v


Q1: 2SA725: BCE 512-KSA992FBU ECB

Q2: 2SA725: BCE 512-KSA992FBU ECB


Power Amp Assembly (AWH-032-0) (Times two) (Check board number, the D version does not have the 1.5uF cap.)


AWH-032-0: C1: .68uF 25v CSSA: 667-ECQ-V1H684JL .68uF 50v

AWH-032-0: C2: 1.5uF 25v CSSA: 647-UKL1H1R5MDD1TA 1.5uF 50v

AWH-032-0: C4: 10uF 16v CEA: 647-UPW1E100MDD 10uF 25v

AWH-032-0: C8: 330uF 6.3v CEA: 647-UPW1A331MPD 330uF 10v


Q1: 2SA726: BCE 512-KSA992FBU ECB

Q2: 2SA726: BCE 512-KSA992FBU ECB

Q3: 2SA726: BCE 512-KSA992FBU ECB

Q5: 2SC1451: 512-KSC3503ESTU ECB

Q6: 2SC1451: 512-KSC3503ESTU ECB


Protection Assembly (AWM-062-0)


AWM-062-0: C1: .22uF 10v CSSA: 667-ECQ-V1H224JL2 .22uF 50v

AWM-062-0: C2: .22uF 10v CSSA: 667-ECQ-V1H224JL2 .22uF 50v

AWM-062-0: C3: 330uF 6.3v CEA: 647-UPW1A331MPD 330uF 10v

AWM-062-0: C4: 330uF 6.3v CEA: 647-UPW1A331MPD 330uF 10v

AWM-062-0: C5: 4.7uF 25v CEA: 647-UPW1V4R7MDD 4.7uF 35v

AWM-062-0: C6: 100uF 16v CEA: 647-UPW1E101MED 100uF 25v


Q7: 2SC1384: ECB 512-KSC2690AYS ECB


Power Supply Assembly (AWR-054-0)


AWR-054-0: C8: 470uF 80v CEA: 647-UPW2A471MHD 470uF 100v

AWR-054-0: C9: 470uF 80v CEA: 647-UPW2A471MHD 470uF 100v

AWR-054-0: C10: 100uF 63v CEA: 647-UPW1J101MPD6 100uF 63v

AWR-054-0: C11: 100uF 63v CEA: 647-UPW1J101MPD6 100uF 63v

AWR-054-0: C12: 100uF 35v CEA: 647-UPW1V101MPD 100uF 35v

AWR-054-0: C13: 100uF 35v CEA: 647-UPW1V101MPD 100uF 35v

AWR-054-0: C14: 47uF 50v CEA: 647-UPW1H470MED 47uF 50v

AWR-054-0: C18: 1000uF 35v CEA: 647-UPW1H102MHD 1000uF 50v

AWR-054-0: C19: 220uF 16v CEA: 647-UPW1V221MPD6 220uF 35v

AWR-054-0: C20: 2200uF 10v CEA: 647-UPW1C222MHD 2200uF 16v

AWR-054-0: C21: 2200uF 10v CEA: 647-UPW1C222MHD 2200uF 16v


R1: 3.3K 2 Watt 594-5083NW3K300J

R2: 3.3K 2 Watt 594-5083NW3K300J

R11: 10 Ohm 1/4 watt: 660-MFS1/2DCT52R10R0 10 Ohm 1/2 watt

R12: 10 Ohm 1/4 watt: 660-MF1/4DCT52A10R0F 10 Ohm 1/2 watt

R20: 3.3 Ohm 1/4 watt: 660-MF1/2DCT52R3R32F 3.32 Ohm 1/2 watt

R21: 10 Ohm 1/4 watt: 660-MFS1/2DCT52R10R0 10 Ohm 1/2 watt


Q1: 2SD313: BCE 863-MJE15032G BCE

Q2: 2SC869: BCE 512-KSC2383YBU ECB

Q3: 2SC869: BCE 512-KSC2383YBU ECB

Q4: 2SB507: BCE 863-MJE15033G BCE

Q5: 2SA628A: BCE 512-KSA1013YBU ECB

Q6: 2SA628A: BCE 512-KSA1013YBU ECB

Q7: 2SD313: BCE 863-MJE15032G BCE

Q8: 2SC1384: ECB 512-KSC2690AYS ECB


BOM List:


647-UPW1A331MPD | 4

647-UKL1H2R2KDDANA | 6

667-ECQ-V1H474JL | 1

647-UPW1C101MED | 4

647-UKL1H4R7KDDANA | 4

647-UPW1E101MED | 7

667-ECQ-V1H334JL | 2

667-ECQ-V1H224JL2 | 2

647-UPW1V101MPD | 2

647-UPW1V221MPD6 | 1

647-UPW1J101MPD6 | 2

647-UPW2A471MHD | 2

647-UPW1C222MHD | 2

647-UPW1H102MHD | 1

647-UPW1H470MED | 2

647-UPW1V4R7MDD | 5

647-UPW1E100MDD | 6

667-ECQ-V1H684JL | 2

647-UKL1H1R5MDD1TA | 2

647-UKL1E101KPDANA | 4

647-UKL1C471KPD | 2

647-UKL1C221KPDANA | 1

647-UKL1C100MDDANA | 2

512-KSA992FBU | 12

512-KSC3503ESTU | 4

512-KSC2690AYS | 2

512-KSA1013YBU | 2

863-MJE15032G | 2

863-MJE15033G | 1

512-KSC2383YBU | 2

 

[zebulon1]

I would say, more likely the 725's in the control amp if it's popping all the time.
No matter they all need to go. Even the 2SC1313. The 992's and 1845's are far superior.
Often - once the set is operational, you will find many other issues that need to be addressed.
Your working your way through it and hitting all the right processes.
The wonky 725's in the tone board will influence the amp settings. Best to remove the "pre out, main in" jumpers to set the amps correctly.
I'll horse in "on hand" components while I'm troubleshooting to get the set operating. This saves time and keeps the orders to a minimum. After repairing the different circuits I'll match up the paired circuits with the same components. Like matching the amps for equal and shared operation.

Control Amp Assembly (AWG-027-0) (Check C49-52, the A version of this board has them as 100uF 16v CEA instead of 47uF 16v CEA like the manual states)

AWG-027-0: C1: .33uF 25v: CSSA: 505-MKS20.33/63/5 .33uF 63v
AWG-027-0: C2: .33uF 25v: CSSA: 505-MKS20.33/63/5 .33uF 63v
AWG-027-0: C7: 100uF 10v CEA: 667-EEU-FM1E101 100uF 25v
AWG-027-0: C8: 100uF 10v CEA: 667-EEU-FM1E101 100uF 25v
AWG-027-0: C13: 2.2uF 25v CSSA: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-027-0: C14: 2.2uF 25v CSSA: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-027-0: C15: 4.7uF 50v CEA: 667-EEU-FC1H4R7 4.7uF 50v
AWG-027-0: C16: 4.7uF 50v CEA: 667-EEU-FC1H4R7 4.7uF 50v
AWG-027-0: C23: 4.7uF 25v CEANL: 647-UKL1H4R7KDDANA 4.7uF 50v
AWG-027-0: C24: 4.7uF 25v CEANL: 647-UKL1H4R7KDDANA 4.7uF 50v
AWG-027-0: C25: 10uF 16v CEA: 667-EEU-FC1H100L 10uF 50v
AWG-027-0: C26: 10uF 16v CEA: 667-EEU-FC1H100L 10uF 50v
AWG-027-0: C29: 100uF 10v CEA: 667-EEU-FM1E101 100uF 25v
AWG-027-0: C30: 100uF 10v CEA: 667-EEU-FM1E101 100uF 25v
AWG-027-0: C31: 4.7uF 50v CEA: 667-EEU-FC1H4R7 4.7uF 50v
AWG-027-0: C32: 4.7uF 50v CEA: 667-EEU-FC1H4R7 4.7uF 50v
AWG-027-0: C39: 4.7uF 25v CEANL: 647-UKL1H4R7KDDANA 4.7uF 50v
AWG-027-0: C40: 4.7uF 25v CEANL: 647-UKL1H4R7KDDANA 4.7uF 50v
AWG-027-0: C41: 10uF 16v CEA: 667-EEU-FC1H100L 10uF 50v
AWG-027-0: C42: 10uF 16v CEA: 667-EEU-FC1H100L 10uF 50v
AWG-027-0: C45: 100uF 10v CEA: 667-EEU-FM1E101 100uF 25v
AWG-027-0: C46: 100uF 10v CEA: 667-EEU-FM1E101 100uF 25v
AWG-027-0: C47: 2.2uF 25v CSSA: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-027-0: C48: 2.2uF 25v CSSA: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-027-0: C49: 47uF 16v CEA or 100uF 16v CEA: 667-EEU-FM1E101 100uF 25v or 667-EEU-FM1E470 47uF 25v
AWG-027-0: C50: 47uF 16v CEA or 100uF 16v CEA: 667-EEU-FM1E101 100uF 25v or 667-EEU-FM1E470 47uF 25v
AWG-027-0: C51: 47uF 16v CEA or 100uF 16v CEA: 667-EEU-FM1E101 100uF 25v or 667-EEU-FM1E470 47uF 25v
AWG-027-0: C52: 47uF 16v CEA or 100uF 16v CEA: 667-EEU-FM1E101 100uF 25v or 667-EEU-FM1E470 47uF 25v

Q1: 2SA725: 512-KSA992FBU
Q2: 2SA725: 512-KSA992FBU
Q3: 2SC1313: 512-KSC1845FTA
Q4: 2SC1313: 512-KSC1845FTA
Q5: 2SC1313: 512-KSC1845FTA
Q6: 2SC1313: 512-KSC1845FTA
Q7: 2SC1313: 512-KSC1845FTA
Q8: 2SC1313: 512-KSC1845FTA