Ok then, let's get to work, this could be fun.... having a well equipped EE on the other end of the line....
(I was an Embedded Software / Hardware guy most of my career - where the software / hardware line blurs )
I have been working with excel spreadsheets for parts specifications. Transistors are covered below, but we have to do the caps. While I could generate the spreadsheet myself in an hour or three, I;m using the time to bring a SX-1980 back from the dead, a real basket case.... and it's just about ready for the world... including NEW outputs.
So, since I have saved you a lot of "transistor time". perhaps you can save me some "capacitor time"...
The information used below comes off the parts lists in the service manual.
first cell is the aaa-nnn board number
second cell is the parts designation c1,q4 etc...
third cell for transistors would be the 2s..... part number.
third for capacitors would be microfarads
fourth for capacitors would be voltage
fifth would be the special designation
(examples:
cea radial general purpose - replaced by nichicon upw, uhe Panasonic .. and ..
ceb axial general purpose nichicon tvx
ceanl low leakage electrolytic (lower noise) nichicon ukl
cssa the UBER dreaded sky blue sanyo capistor solid aluminum electrolytics
csza the dreaded tantalum caps, nichicon ukl
and others)
using those specs in the excel file as my input data (which REALLY speeds things up for me and are GREATLY appreciated) I come up with Nichicon cap parts numbers in stock at mouser.com. A LOT of my recent posts (1050,1080,1250 etc) in threads can supply examples of this.
you will notice that to post an excel spreadsheet, zipping it is the way to get the board software to accept the post.
read these, especially:
in this thread :
http://www.audiokarma.org/forums/showthread.php?t=322650
this post:
http://www.audiokarma.org/forums/showpost.php?p=4042555&postcount=15
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now here is an accumulated file that was probably posted somewhere else already, it is mainy EchoWar's comments then some of my own:
Normally, you'd be correct to properly troubleshoot the problem first, but the Spec 2 runs the VAS stage so hard that those transistors are almost always fried from years of use. When I rebuild a Spec 2, every transistor on the driver board gets replaced.
Q1 to assure good offset,
Q4, Q5, Q6, and Q12 with new MJE15032G's,
Q7 & Q13 with new MJE15033G,
Q8, Q9, Q10 & Q11 with Fairchild equivalents
(especially if the amp has ever been blown and had shorted outputs),
and Q2 & Q3 just because everything else was done
(I use Fairchild KSA992 here). D2 is a 34V 1W zener, and I use a series'd
pair of 17V 500mW zeners to replace, since a 34V 1W zener is an oddball,
and lastly I replace the bias interrupt relay as outlined here.
When the transistors in the VAS stage (Q4~Q7) go wacky, it's not unusual to see the power meter going silly buggers. But failures of one or more of the meter driver transistors (Q1~Q8 on the meter amp assy) are also common.
I simply replace them all with new Fairchild KSC945 and KSA733,
same transistors used in the V/I limiter on the amp board.
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mtf
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Ok, just want to get a quick warning about the ksa733's and ksc945's
(Q8 - Q11 & meters) in here for the record:
The ksa733 has an ebc pinout
the ksa733C has a center collector pinout: ecb
mouser.com
512-KSA733LBU to-92 eBc 50v .15a .25w 180mhz 40-700hfe $0.05 ea
512-KSC945LBU to-92 eBc 50v .15a .25w 300mhz 40-700hfe $0.05 ea
....
512-KSA733CLTA to-92 eCb 50v .15a .25w 180mhz 40-700hfe $0.05 ea
512-KSC945CLTA to-92 eCb 50v .15a .25w 300mhz 40-700hfe $0.05 ea
bu = bulk
ta = ammo strip
and the mje15033 has been out, with a 4/19 (703 quan) ship date at mouser.
been waitin for that one to get back in stock.
863-MJE15033G pnp to-220 bce 250v 8a 50w 30mhz 70hfe $0.87
863-MJE15032G npn to-220 bce 250v 8a 50w 30mhz 70hfe $0.87
512-KSA992FBU (ln)to-92 ecb 120v .05a .5w 100mhz 150-800hfe $0.05 ea
512-KSC1845UBU (ln)to-92 ecb 120v .05a .5w 100mhz 150-800hfe $0.05 ea
512-1N5247B Fairchild 17 V, 0.5W Zener
and just for grins, outputs:
........534-4662 to-3 mica insulators $0.16 each.................
863-MJ21193G pnp to-3 250v 16A 250W 4mhz 8-75hfe $3.83
863-MJ21194G npn to-3 250v 16A 250W 4mhz 8-75hfe $3.83
here's a quote you may find, BUT there are obsoleted numbers on it, which have been corrected
Quote:
Originally Posted by donberry View Post
For what it is worth.
Was thinking it might be nice to have all of these in one place.
Here is a list of all of the replacement transistors.
All I did was go thru old posts and copy those down -
mostly compliments of Markthefixer and echowars.
I was not 100% sure about Q12 on the meter board.
Amp Board
Q1 – 2SA798
Q2 - 2SA872 - 512-KSA992FBU
Q3 - 2SA872 - 512-KSA992FBU
Q4 – 2SD610A - MJE15032G
Q5 - 2SD610A - MJE15032G
Q6 - 2SD610A - MJE15032G
Q7 - 2SB630A = MJE15033G
Q8 - 2SA733 - 512-KSA733CLTA
Q9 2SC945 - 512-KSC945CLTA
Q10 - 2SC945 - 512-KSC945CLTA
Q11 - 2SA733 - 512-KSA733CLTA
Q12 - 2SD610A - MJE15032G
Q13 - 2SB630A = MJE15033G
Meter Board
Q1 -2SC1312 - 512-KSC1845EBU
Q2 - 2SC1312 - 512-KSC1845EBU
Q3 – 2SA725 - 512-KSA992FBU
Q4 - 2SA725 - 512-KSA992FBU
Q5 - 2SA725 - 512-KSA992FBU
Q6 - 2SA725 - 512-KSA992FBU
Q7 - 2SC1312 - 512-KSC1845EBU
Q8 - 2SC1312 - 512-KSC1845EBU
Q9 - 2SC1312 - 512-KSC1845EBU
Q10 - 2SC1312 - 512-KSC1845EBU
Q11 - 2SA733 - 512-KSA733CLTA
Q12 – 2SC1384 - 512-KSC2682YSTU to-126 ecb 180v .1a 1.2/8w 200mhz 100-320hfe $0.31 ea obsoleted!!!, current dump for turnoff
Q12new - 2sc1384 - 512-KSC2383YBU to-92L ecb 160v 1a .9w 50mhz 160-320hfe $0.17
Q13 - 2SC945 - 512-KSC945CLTA
Q14 - 2SC1384 - 512-KSC2682YSTU to-126 ecb 180v .1a 1.2/8w 200mhz 100-320hfe $0.31 ea obsoleted!!!, relay drive
Q14new - 2sc1384 - 512-KSC2383YBU to-92L ecb 160v 1a .9w 50mhz 160-320hfe $0.17
Q14mtf - 512-KSC2690AYS to-126 ecb 120/a160 1.2a 20w 155mhz 35-320hfe $0.40
Q15 - 2SC1384 - 512-KSC2682YSTU to-126 ecb 180v .1a 1.2/8w 200mhz 100-320hfe $0.31 ea obsoleted!!!, lamp drive
Q15new - 2sc1384 - 512-KSC2383YBU to-92L ecb 160v 1a .9w 50mhz 160-320hfe $0.17
Q15mtf - 512-KSC2690AYS to-126 ecb 120/a160 1.2a 20w 155mhz 35-320hfe $0.40
Q16 - 2SD313 - 512-KSC2073TU
Q17 - 2SB507 - 512-KSA940TU_Q
RL-1 Reed Relay - Hamlin HE3300 Series 24V SPST relay. Part #HE129-ND(amp board) (this is a digikey number)
(notice no capacitors, I await your posting of an excel spreadsheet, as a ZIP file)
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