I've got a Sansui 2000 that I picked up cheap last year. I actually got a working unit with an identical parts unit, manual, and original papers for $100
. The working unit was 100% untouched. I cleaned all the pots and switches and it quickly became my daily listener. However, I began to notice that during longer sessions, the left channel would begin to distort the low end. The louder I would listen, the quicker the issue would happen. Overall, that channel seemed weaker and flat too. So i figured it was time for a recap and any other repairs. I'm actually very thankful for the information I found in this forum on common issues and transistor subs and such. So here is what I've done so far:
Chassis:
C004 -> 2200mfd, 100V Nichicon LGU (2000mfd 75v listed, 2000mfd 75v removed)
C822 -> 2200mfd, 50v Nichicon LKG (2000mfd 50v listed, 2000mfd 50v removed)
C811 -> 2200mfd, 50v Nichicon LKG (2000mfd 50v listed, 2000mfd 50v removed)
Diode Stack: F-1021A
C003 -> 1000mfd 50v Nichicon UPW (1000mfd 25v listed, 1000mfd 25v removed)
Ripple Filter: F-1018A
C005 -> 220mfd, 50V Nichicon UPW (200mfd 50v listed, 220mfd 50v removed)
C006 -> 220mfd, 50V Nichicon UPW (200mfd 35v listed, 220mfd 35v removed)
C007 -> 220mfd, 50V Nichicon UPW (200mfd 35v listed, 220mfd 35v removed)
C008 -> 560mfd, 50V Nichicon UPW (200mfd 25v listed, 470mfd 25v was removed and is also in the parts unit)
C009 -> 220mfd, 50V Nichicon UPW (200mfd 25v listed, 220mfd 25v removed)
C010 -> 220mfd, 50V Nichicon UPW (200mfd 15v listed, 220mfd 15v removed)
Equalizer Amp: F-1037
C603 -> 33mfd 35v Elna Silmic II (30mfd 6v listed, 33mfd 6v removed)
C604 -> 33mfd 35v Elna Silmic II (30mfd 6v listed, 33mfd 6v removed)
C606 -> 47mfd 25v Elna Silmic II (50mfd 6v listed, 47mfd 6.3v removed)
C607 -> 10mfd 100v Elna Silmic II (10mfd 25v listed, 10mfd, 25v removed)
C611 -> 2.2mfd 100v Elna Silmic II (1.5mfd 15v listed, 1.5mfd, 15 removed)
C613 -> 33mfd 35v Elna Silmic II (30mfd 6v listed, 33mfd 6v removed)
C614 -> 33mfd 35v Elna Silmic II (30mfd 6v listed, 33mfd 6v removed)
C616 -> 47mfd 25v Elna Silmic II (50mfd 6v listed, 47mfd 6.3v removed)
C617 -> 10mfd 100v Elna Silmic II (10mfd 25v listed, 10mfd, 25v removed)
TR601 -> BC548CTA ON Semi (2SC-650 listed, 2SC-650 removed)
TR602 -> KSC1845FTA ON Semi (2SC-281 listed, 2SC-281 removed)
TR603 -> BC548CTA ON Semi (2SC-650 listed, 2SC-650 removed)
TR604 -> KSC1845FTA ON Semi (2SC-281 listed, 2SC-281 removed)
Control Amp: F-1016A
C704 -> 33mfd 35v Elna Silmic II (30mfd 16v listed, 33mfd 16v removed)
C705 -> 33mfd 35v Elna Silmic II (30mfd 10v listed, 33mfd 16v removed)
C706 -> 1mfd 50v Elna Silmic II (1mfd 25v listed, 1mfd 25v removed)
C710 -> 10mfd 100v Elna Silmic II (10mfd 25v listed, 10mfd 25v removed)
C712 -> 33mfd, 35v Elna Silmic II (30mfd 10v listed, 33mfd 10v removed)
C713 -> 1mfd 50v Elna Silmic II (10mfd 25v listed, 10mfd 25v removed)
C717 -> 33mfd 35v Elna Silmic II (30mfd 16v listed, 33mfd 16v removed)
C718 -> 33mfd 35v Elna Silmic II (30mfd 10v listed, 33mfd 16v removed)
C719 -> 1mfd 50v Elna Silmic II (1mfd 25v listed, 1mfd 25v removed)
C723 -> 10mfd 100v Elna Silmic II (10mfd 25v listed, 10mfd 25v removed)
C725 -> 33mfd, 35v Elna Silmic II (30mfd 10v listed, 33mfd 10v removed)
C726 -> 1mfd 50v Elna Silmic II (10mfd 25v listed, 10mfd 25v removed)
TR701 -> KSC1845FTA ON Semi (2SC693 listed, 2SC693 removed)
TR702 -> KSC1845FTA ON Semi (2SC-536 listed, 2SC-536 removed)
TR703 -> KSC1845FTA ON Semi (2SC-871D listed, 2SC871D removed)
TR704 -> KSC1845FTA ON Semi (2SC693 listed, 2SC693 removed)
TR705 -> KSC1845FTA ON Semi (2SC-536 listed, 2SC-536 removed)
TR706 -> KSC1845FTA ON Semi (2SC-871D listed, 2SC871D removed)
Driver Amps: F-1001C
C803 -> 47mfd 25v Elna Silmic II (50mfd 10v listed, 47mfd 10v removed)
C804 -> 4.7mfd 50v Elna Silmic II (5mfd 25v listed, 4.7mfd 25v removed)
C805 -> 4.7mfd 50v Elna Silmic II (5mfd 50v listed, 5mfd, 50v removed)
C807 -> 47mfd 25v Elna Silmic II (50mfd 10v listed, 47mfd 10v removed)
C808 -> 33mfd 35v Elna Silmic II (30mfd 35v listed, 33mfd 35v removed)
C810 -> 33mfd 35v Elna Silmic II (30mfd 35v listed, 33mfd 35v removed)
C814 -> 47mfd 25v Elna Silmic II (50mfd 10v listed, 47mfd 10v removed)
C815 -> 4.7mfd 50v Elna Silmic II (5mfd 25v listed, 4.7mfd 25v removed)
C816 -> 4.7mfd 50v Elna Silmic II (5mfd 50v listed, 5mfd, 50v removed)
C818 -> 47mfd 25v Elna Silmic II (50mfd 10v listed, 47mfd 10v removed)
C819 -> 33mfd 35v Elna Silmic II (30mfd 35v listed, 33mfd 35v removed)
C821 -> 33mfd 35v Elna Silmic II (30mfd 35v listed, 33mfd 35v removed)
TR801 -> KSC1845FTA ON Semi (2SC-458LG listed, 2SC-458LG removed)
TR802 -> KSC1845FTA ON Semi (2SC-826 listed, 2SC-826 removed)
TR803 -> KSC2690AYS ON Semi (2SC-708 listed, 2SC-708 removed)
TR804 -> KSC1220AYS ON Semi (2SC-537 listed, 2SC-537 removed)
TR807 -> KSC1845FTA ON Semi (2SC-458LG listed, 2SC-458LG removed)
TR808 -> KSC1845FTA ON Semi (2SC-826 listed, 2SC-826 removed)
TR809 -> KSC2690AYS ON Semi (2SC-708 listed, 2SC-708 removed)
TR810 -> KSC1220AYS ON Semi (2SC-537 listed, 2SC-537 removed)
I did caps and transistors on 1 board at a time (ripple filter, diode stack, equalizer, control, chassis, driver amps in that order). Each board provided improvement, but the remaining issues would change (if that makes sense). I'm assuming because I went in somewhat of an order that would cascade any change into the next board and so on. After all the changes, the right channel output bias was very low at 16mA, the left channel was very high at 125mA!. So I adjusted Output Bias to 25mA on each channel.
So where I am at now; the right channel is beautiful! But the left channel now has slight distortion all the time, and through out all frequencies, and remains flat-ish, especially low end. It almost seems like all my work didn't really address the underlaying issue. So I'm thinking maybe the output transistors next? I know new equivalents aren't cheap and can be hard to find. I have no idea if my parts unit has good ones or not, but maybe I should start there? I'd love to hear any other thoughts on where to look first. Maybe I fried a transistor somewhere during my install? Maybe there is a film cap bad somewhere that I should look for? BTW, I don't have a scope if that make any difference in how I should go about diagnosing.
. The working unit was 100% untouched. I cleaned all the pots and switches and it quickly became my daily listener. However, I began to notice that during longer sessions, the left channel would begin to distort the low end. The louder I would listen, the quicker the issue would happen. Overall, that channel seemed weaker and flat too. So i figured it was time for a recap and any other repairs. I'm actually very thankful for the information I found in this forum on common issues and transistor subs and such. So here is what I've done so far:Chassis:
C004 -> 2200mfd, 100V Nichicon LGU (2000mfd 75v listed, 2000mfd 75v removed)
C822 -> 2200mfd, 50v Nichicon LKG (2000mfd 50v listed, 2000mfd 50v removed)
C811 -> 2200mfd, 50v Nichicon LKG (2000mfd 50v listed, 2000mfd 50v removed)
Diode Stack: F-1021A
C003 -> 1000mfd 50v Nichicon UPW (1000mfd 25v listed, 1000mfd 25v removed)
Ripple Filter: F-1018A
C005 -> 220mfd, 50V Nichicon UPW (200mfd 50v listed, 220mfd 50v removed)
C006 -> 220mfd, 50V Nichicon UPW (200mfd 35v listed, 220mfd 35v removed)
C007 -> 220mfd, 50V Nichicon UPW (200mfd 35v listed, 220mfd 35v removed)
C008 -> 560mfd, 50V Nichicon UPW (200mfd 25v listed, 470mfd 25v was removed and is also in the parts unit)
C009 -> 220mfd, 50V Nichicon UPW (200mfd 25v listed, 220mfd 25v removed)
C010 -> 220mfd, 50V Nichicon UPW (200mfd 15v listed, 220mfd 15v removed)
Equalizer Amp: F-1037
C603 -> 33mfd 35v Elna Silmic II (30mfd 6v listed, 33mfd 6v removed)
C604 -> 33mfd 35v Elna Silmic II (30mfd 6v listed, 33mfd 6v removed)
C606 -> 47mfd 25v Elna Silmic II (50mfd 6v listed, 47mfd 6.3v removed)
C607 -> 10mfd 100v Elna Silmic II (10mfd 25v listed, 10mfd, 25v removed)
C611 -> 2.2mfd 100v Elna Silmic II (1.5mfd 15v listed, 1.5mfd, 15 removed)
C613 -> 33mfd 35v Elna Silmic II (30mfd 6v listed, 33mfd 6v removed)
C614 -> 33mfd 35v Elna Silmic II (30mfd 6v listed, 33mfd 6v removed)
C616 -> 47mfd 25v Elna Silmic II (50mfd 6v listed, 47mfd 6.3v removed)
C617 -> 10mfd 100v Elna Silmic II (10mfd 25v listed, 10mfd, 25v removed)
TR601 -> BC548CTA ON Semi (2SC-650 listed, 2SC-650 removed)
TR602 -> KSC1845FTA ON Semi (2SC-281 listed, 2SC-281 removed)
TR603 -> BC548CTA ON Semi (2SC-650 listed, 2SC-650 removed)
TR604 -> KSC1845FTA ON Semi (2SC-281 listed, 2SC-281 removed)
Control Amp: F-1016A
C704 -> 33mfd 35v Elna Silmic II (30mfd 16v listed, 33mfd 16v removed)
C705 -> 33mfd 35v Elna Silmic II (30mfd 10v listed, 33mfd 16v removed)
C706 -> 1mfd 50v Elna Silmic II (1mfd 25v listed, 1mfd 25v removed)
C710 -> 10mfd 100v Elna Silmic II (10mfd 25v listed, 10mfd 25v removed)
C712 -> 33mfd, 35v Elna Silmic II (30mfd 10v listed, 33mfd 10v removed)
C713 -> 1mfd 50v Elna Silmic II (10mfd 25v listed, 10mfd 25v removed)
C717 -> 33mfd 35v Elna Silmic II (30mfd 16v listed, 33mfd 16v removed)
C718 -> 33mfd 35v Elna Silmic II (30mfd 10v listed, 33mfd 16v removed)
C719 -> 1mfd 50v Elna Silmic II (1mfd 25v listed, 1mfd 25v removed)
C723 -> 10mfd 100v Elna Silmic II (10mfd 25v listed, 10mfd 25v removed)
C725 -> 33mfd, 35v Elna Silmic II (30mfd 10v listed, 33mfd 10v removed)
C726 -> 1mfd 50v Elna Silmic II (10mfd 25v listed, 10mfd 25v removed)
TR701 -> KSC1845FTA ON Semi (2SC693 listed, 2SC693 removed)
TR702 -> KSC1845FTA ON Semi (2SC-536 listed, 2SC-536 removed)
TR703 -> KSC1845FTA ON Semi (2SC-871D listed, 2SC871D removed)
TR704 -> KSC1845FTA ON Semi (2SC693 listed, 2SC693 removed)
TR705 -> KSC1845FTA ON Semi (2SC-536 listed, 2SC-536 removed)
TR706 -> KSC1845FTA ON Semi (2SC-871D listed, 2SC871D removed)
Driver Amps: F-1001C
C803 -> 47mfd 25v Elna Silmic II (50mfd 10v listed, 47mfd 10v removed)
C804 -> 4.7mfd 50v Elna Silmic II (5mfd 25v listed, 4.7mfd 25v removed)
C805 -> 4.7mfd 50v Elna Silmic II (5mfd 50v listed, 5mfd, 50v removed)
C807 -> 47mfd 25v Elna Silmic II (50mfd 10v listed, 47mfd 10v removed)
C808 -> 33mfd 35v Elna Silmic II (30mfd 35v listed, 33mfd 35v removed)
C810 -> 33mfd 35v Elna Silmic II (30mfd 35v listed, 33mfd 35v removed)
C814 -> 47mfd 25v Elna Silmic II (50mfd 10v listed, 47mfd 10v removed)
C815 -> 4.7mfd 50v Elna Silmic II (5mfd 25v listed, 4.7mfd 25v removed)
C816 -> 4.7mfd 50v Elna Silmic II (5mfd 50v listed, 5mfd, 50v removed)
C818 -> 47mfd 25v Elna Silmic II (50mfd 10v listed, 47mfd 10v removed)
C819 -> 33mfd 35v Elna Silmic II (30mfd 35v listed, 33mfd 35v removed)
C821 -> 33mfd 35v Elna Silmic II (30mfd 35v listed, 33mfd 35v removed)
TR801 -> KSC1845FTA ON Semi (2SC-458LG listed, 2SC-458LG removed)
TR802 -> KSC1845FTA ON Semi (2SC-826 listed, 2SC-826 removed)
TR803 -> KSC2690AYS ON Semi (2SC-708 listed, 2SC-708 removed)
TR804 -> KSC1220AYS ON Semi (2SC-537 listed, 2SC-537 removed)
TR807 -> KSC1845FTA ON Semi (2SC-458LG listed, 2SC-458LG removed)
TR808 -> KSC1845FTA ON Semi (2SC-826 listed, 2SC-826 removed)
TR809 -> KSC2690AYS ON Semi (2SC-708 listed, 2SC-708 removed)
TR810 -> KSC1220AYS ON Semi (2SC-537 listed, 2SC-537 removed)
I did caps and transistors on 1 board at a time (ripple filter, diode stack, equalizer, control, chassis, driver amps in that order). Each board provided improvement, but the remaining issues would change (if that makes sense). I'm assuming because I went in somewhat of an order that would cascade any change into the next board and so on. After all the changes, the right channel output bias was very low at 16mA, the left channel was very high at 125mA!. So I adjusted Output Bias to 25mA on each channel.
So where I am at now; the right channel is beautiful! But the left channel now has slight distortion all the time, and through out all frequencies, and remains flat-ish, especially low end. It almost seems like all my work didn't really address the underlaying issue. So I'm thinking maybe the output transistors next? I know new equivalents aren't cheap and can be hard to find. I have no idea if my parts unit has good ones or not, but maybe I should start there? I'd love to hear any other thoughts on where to look first. Maybe I fried a transistor somewhere during my install? Maybe there is a film cap bad somewhere that I should look for? BTW, I don't have a scope if that make any difference in how I should go about diagnosing.
