eentegra
New Member
Well I think its time to recap the ole SX-1050. I have perused through many threads on this topics but i want a second opinion as always. You guys are experts in my book. I just don't want to make a mistake that somebody else had made. I do have soldering background. I am familiar with electronics. I have the service manual as well. So here are some background and questions i have on the unit under test.
- Looks like somebody else had gone in and changed some caps on some boards from stock to Nippon ChemiCons. I’ll change them anyway.
- DBT is done and have been tested and is working properly.
- On the power amp board. Do I need to remove the rear panel? Looks like im going to have to move this board around to get to pwr board A.
- Are the power amp transistors only ones with micas?
- How difficult is it to remove/work on pwr supply B? it’s buried in there
- I do notice a static-ish pop on the 5-second delay turning on. Hoping to resolve this after a recap and driver swap (Q6,Q7).
- I dont plan on recapping the tuner right now.
- I’ll work in this order: protection, pwr a, pwr b, then pwr amp. Once I get that going, then I’ll plan on the eq, filter, flat and control. After each board I’ll test with DBT to verify.
- Thermal grease application on trans being replaced. I’ll be using GC silicone type.
- I will not change the 2 filter caps as they look good. Nippon ChemiCon types. Again may have been changed previously.
- I am only planning to change some transistors and not all. Good idea?
Here is the parts list,with spares, I plan on ordering (gathered from previous MTF threads):
source
http://www.audiokarma.org/forums/showthread.php?t=342822
http://www.audiokarma.org/forums/showthread.php?t=640549
Mouser
Mfr Value Volts Qty Spares Ref Part No
Protect
470 6 2 3 C3,C4 647-UPW1A471MPD
2.2 50 1 2 C5 647-UPW1H2R2MDD
47 50 1 2 C6 647-UPW1H470MED
0.22 25 2 3 C1 C2 598-DSF050J224
2SC945A 1 5 Q6 512-KSC2383YTA
2SC1384 1 2 Q7 512-KSC2690AYS
A 220 80 2 3 C1 C9 647-UPW2A221MHD
47 16 2 3 C3 C12 647-UPW1V470MED
47 35 2 3 C6 C14 647-UPW1V470MED
10 35 1 2 C7 647-UPW1H100MDD
1 50 1 2 C8 647-UPW1H010MDD
100 35 1 2 C15 647-UPW1V101MPD
220 25 1 2 C16 647-UPW1E221MPD
47 10 2 3 C17 C22 647-UPW1V470MED
100 25 1 2 C20 647-UPW1V101MPD
220 16 1 2 C24 647-UPW1E221MPD
2.2 50 1 2 C23 647-UPW1H2R2MDD
2SB507P 1 2 Q5 512-KSA940TU
2SD325R 1 3 Q9 512-ksc2073TU
Surge 10 63 1 2 C1 647-UPJ2A100MED
B 470 80 2 3 C9 C10 647-UPW2A471MHD
2200 25 1 2 C11 647-UPW1V222MHD
AMP 0.68 25 2 4 C1 C2 ECQ-V1H684JL
10 16 2 3 C5 C6 647-UPW1H100MDD
470 6 4 5 C25:28 647-UPW1A471MPD
2SD381A 2 3 Q19 Q20 512-KSC2073TU
2SB536A 2 3 Q17 Q18 512-KSA940TU
EQ
4.7 25 2 3 C1 C2 647-UKL1E4R7KDDANA
220 35 2 3 C5 C6 647-UPW1V221MPD
220 10 2 3 C9 C10 647-UPW1E221MPD
33 35 2 3 C17 C18 647-UPW1V330MDD
10 35 2 3 C21 C22 647-UKL1H100KDDANA
2SA841S 4 5 Q1:4 512-KSA992FBU
2SA726 4 5 Q1:4 "OR" 512-KSA992FBU
2SC1775A 4 5 Q5:8 512-KSC1845FTA
2SC872A 2 5 Q9:10 512-KSA992FBU
Filter 4.7 25 2 3 C3 C9 647-UKL1E4R7KDDANA
10 25 2 3 C6 C12 647-UKL1H100KDDANA
2SC1313 2 3 Q1:2 512-KSC1845FTA
Flat 1 25 4 5 C1:C4 647-UKL1H010KDDANAtd
4.7 25 2 3 C5:6 647-UKL1E4R7KDDANA
220 35 4 5 C7:8 C25:26 647-UPW1V221MPD
2.2 25 2 3 C13:14 647-UKL1H2R2KDDANA
100 10 4 5 C15:16 C23:24 647-UKL1A101KEDANA
2SA725 2 3 Q7:8 512-KSA992FBU
2SC1775A 4 5 Q1:2 512-KSC1845FTA
2SC872A 2 5 Q3:4 512-KSA992FBU
Control
4.7 25 4 5 C1:4 647-UKL1E4R7KDDANA
2.2 25 12 13 C11:14, C19:20 C27:30, C35:36
647-UKL1H2R2KDDANA
100 16 6 7 C17:18 C37:40 647-UPW1V101MPD
100 10 2 3 C33:34 647-UPW1V101MPD
10 25 2 3 C43:44 647-UKL1H100KDDANA
2SC1312 4 5 Q1:4 512-KSC1845FTA
Any other lessons learned from all of you who had done this recap/restoration? Anything I should watch out for?
Thanks in advance and i'll update this and take some before and after pics.
/Ron
- Looks like somebody else had gone in and changed some caps on some boards from stock to Nippon ChemiCons. I’ll change them anyway.
- DBT is done and have been tested and is working properly.
- On the power amp board. Do I need to remove the rear panel? Looks like im going to have to move this board around to get to pwr board A.
- Are the power amp transistors only ones with micas?
- How difficult is it to remove/work on pwr supply B? it’s buried in there
- I do notice a static-ish pop on the 5-second delay turning on. Hoping to resolve this after a recap and driver swap (Q6,Q7).
- I dont plan on recapping the tuner right now.
- I’ll work in this order: protection, pwr a, pwr b, then pwr amp. Once I get that going, then I’ll plan on the eq, filter, flat and control. After each board I’ll test with DBT to verify.
- Thermal grease application on trans being replaced. I’ll be using GC silicone type.
- I will not change the 2 filter caps as they look good. Nippon ChemiCon types. Again may have been changed previously.
- I am only planning to change some transistors and not all. Good idea?
Here is the parts list,with spares, I plan on ordering (gathered from previous MTF threads):
source
http://www.audiokarma.org/forums/showthread.php?t=342822
http://www.audiokarma.org/forums/showthread.php?t=640549
Mouser
Mfr Value Volts Qty Spares Ref Part No
Protect
470 6 2 3 C3,C4 647-UPW1A471MPD
2.2 50 1 2 C5 647-UPW1H2R2MDD
47 50 1 2 C6 647-UPW1H470MED
0.22 25 2 3 C1 C2 598-DSF050J224
2SC945A 1 5 Q6 512-KSC2383YTA
2SC1384 1 2 Q7 512-KSC2690AYS
A 220 80 2 3 C1 C9 647-UPW2A221MHD
47 16 2 3 C3 C12 647-UPW1V470MED
47 35 2 3 C6 C14 647-UPW1V470MED
10 35 1 2 C7 647-UPW1H100MDD
1 50 1 2 C8 647-UPW1H010MDD
100 35 1 2 C15 647-UPW1V101MPD
220 25 1 2 C16 647-UPW1E221MPD
47 10 2 3 C17 C22 647-UPW1V470MED
100 25 1 2 C20 647-UPW1V101MPD
220 16 1 2 C24 647-UPW1E221MPD
2.2 50 1 2 C23 647-UPW1H2R2MDD
2SB507P 1 2 Q5 512-KSA940TU
2SD325R 1 3 Q9 512-ksc2073TU
Surge 10 63 1 2 C1 647-UPJ2A100MED
B 470 80 2 3 C9 C10 647-UPW2A471MHD
2200 25 1 2 C11 647-UPW1V222MHD
AMP 0.68 25 2 4 C1 C2 ECQ-V1H684JL
10 16 2 3 C5 C6 647-UPW1H100MDD
470 6 4 5 C25:28 647-UPW1A471MPD
2SD381A 2 3 Q19 Q20 512-KSC2073TU
2SB536A 2 3 Q17 Q18 512-KSA940TU
EQ
4.7 25 2 3 C1 C2 647-UKL1E4R7KDDANA
220 35 2 3 C5 C6 647-UPW1V221MPD
220 10 2 3 C9 C10 647-UPW1E221MPD
33 35 2 3 C17 C18 647-UPW1V330MDD
10 35 2 3 C21 C22 647-UKL1H100KDDANA
2SA841S 4 5 Q1:4 512-KSA992FBU
2SA726 4 5 Q1:4 "OR" 512-KSA992FBU
2SC1775A 4 5 Q5:8 512-KSC1845FTA
2SC872A 2 5 Q9:10 512-KSA992FBU
Filter 4.7 25 2 3 C3 C9 647-UKL1E4R7KDDANA
10 25 2 3 C6 C12 647-UKL1H100KDDANA
2SC1313 2 3 Q1:2 512-KSC1845FTA
Flat 1 25 4 5 C1:C4 647-UKL1H010KDDANAtd
4.7 25 2 3 C5:6 647-UKL1E4R7KDDANA
220 35 4 5 C7:8 C25:26 647-UPW1V221MPD
2.2 25 2 3 C13:14 647-UKL1H2R2KDDANA
100 10 4 5 C15:16 C23:24 647-UKL1A101KEDANA
2SA725 2 3 Q7:8 512-KSA992FBU
2SC1775A 4 5 Q1:2 512-KSC1845FTA
2SC872A 2 5 Q3:4 512-KSA992FBU
Control
4.7 25 4 5 C1:4 647-UKL1E4R7KDDANA
2.2 25 12 13 C11:14, C19:20 C27:30, C35:36
647-UKL1H2R2KDDANA
100 16 6 7 C17:18 C37:40 647-UPW1V101MPD
100 10 2 3 C33:34 647-UPW1V101MPD
10 25 2 3 C43:44 647-UKL1H100KDDANA
2SC1312 4 5 Q1:4 512-KSC1845FTA
Any other lessons learned from all of you who had done this recap/restoration? Anything I should watch out for?
Thanks in advance and i'll update this and take some before and after pics.
/Ron