exploded capacitors!

[spudulike]

No problem, glad to help

[no one ever]

the part numbers on the service sheet (with the schem, in the top left) aren't available with mouser... i'm guessing these are really outdated, as the  sheet says DEC. 26, 1980.

IC- TA7136P
D1- RD11eb  3
D2- RD5JEB
and the q's all start with 2sc...

even the no.'s stamped on the trannies in the box already don't check out with mouser, just finds completely absurd cross references. anybody recommend anything for a complete semiconductor overhaul? 1n1948's for all diodes? and recommend some trannies, pleeease (i recognize there are several diferent types in the schem)

[PenPen]

Ok, first off, please list what parts are in YOUR box, on the transistors and opamp. The older DS-1's used the TA7136P, which is a single opamp, the later ones used a dual. I recommended a dual opamp to replace the m5223 because the m5223 is a dual opamp. I'm not sure what service sheet you are referencing, but it sounds like an older one, vs the new design DS-1 you have there in your hands. List out the transistors you have in your particular box, and lets forget what the sheet says for a sec.

[no one ever]

Ok, first off, please list what parts are in YOUR box, on the transistors and opamp. The older DS-1's used the TA7136P, which is a single opamp, the later ones used a dual. I recommended a dual opamp to replace the m5223 because the m5223 is a dual opamp. I'm not sure what service sheet you are referencing, but it sounds like an older one, vs the new design DS-1 you have there in your hands. List out the transistors you have in your particular box, and lets forget what the sheet says for a sec.

yes sir... may i ask, however, why boss switched to a dual ic? that TA chip seems somewhat sought-after, for some reason...

Q's:
k30aY3e
k30agr3l
c2240gr4b
c2240gr4c
c2458gr4a

diodes:
mystery-- all that's visible is "5"
all others are 1n1948

IC- m5223AL

[PenPen]

Boss switched I believe because the old chip was getting scarce, and they are sought after now for the same reason. Out of production chips are expensive and hard to source, therefore Boss couldn't produce the DS-1 cheaply, so they likely then switched to a part that is easier to find for a cheaper price. Happens all the time.

Now, we need to look up those transistors to get their characteristics, so you can put in some replacements. Or, you can just get some 2N5088's and put those in there. I am basing my info from the layout at tonepad.com. Here is the link in case you want to reference this doc yourself:
http://tonepad.com/project.asp?id=37

[no one ever]

got 3 of each polar cap, "low esr". should be good.

also have plenty of diodes, save the "5" mystery one.


ok...2 2n5088's... but there are 8 q's  and 3 diff types in this current ds-1...


sorry, dyslexic moment (my favorite 50 cent song's 12 questions), i meant 1n9148's.

[no one ever]

anyone know any replacements for the transistors?

how do i look up these transistors?

i found a diode that is marked 'H 48'... any ideas?

[PenPen]

Go to the NTE site and look up the part numbers to get a cross reference, then look at the datasheet. Will tell you a bit about the part.
http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search?OpenForm

K30A looks like an N-Channel JFet (replace with J201?)
C2240 is an NPN transistor with a gain of around 150 (replace with 2N5088?)
C2458GR is an NPN transistor with a high gain, around 400 (replace with 2N5088?)

I don't have subs for those just yet, got some work come in and I have to get this done this weekend. I'll post again when I've had time to find the subs. Though you could look up the parts and determine some replacements with what I've given you so far.

Don't worry too much about the diodes, just get ones that are similar. It won't make too much difference really. But, if one of them is a power diode make sure you replace it with another power diode.

[no one ever]

thank you very much, pen pen. i'll check that.


oh, and i assume by power diode you mean the rectifying diodes (black)?