Anyone bother to redraw a Marshall DSL 2000 schematic?

[plexibreath]

I've never seen a more confusing schematic in my 25 years in electronics than the one for this amp as drawn by Marshall. The confusion lies with all those CON# two pin connectors, the text such as CON3->CON2 defines connections that don't make much sense.

Has anyone here redrawn a schematic of this amp that forgoes these connectors?

Thanks,
John Kelley Brown

[tubeswell]

Dunno but I found an interesting article about a common problem with the DSL201 here;

http://www.historiclespauls.com/musi...d=22&Itemid=48

[plexibreath]

Thanks for the link. I'm going to try to decode this schematic, then draw a simplified version. I'll give it to the forum when I'm done, but it may take a while.

Kelley

[Enzo]

The schematics are for boards, not the entire system. SO when the signal leaves for example the main tube board to go to the front panel controls, it leaves via CON1 which is conected to CON14 (or whatever) on the front panel board. Usually there is also a reference to the board number

Unless someone removed all the various jumper cables inside, I rarely need to sort all that out. Once in a while I do when trying to find a break in the signal path.

I am looking at the DSL100 drawing for the main tube board, JCM2-60-00 and just to the right of V1 are CON13,CON3,CON14. Note just below those is a legend stating:
CON14->COIN6
CON13->COIN2
(etc)
All above on JCM2-61-00

That shows the matching connector on the 61-00 board, which is the preamp control panel board.

yes, it is clumsy.

[plexibreath]

The schematics are for boards, not the entire system. SO when the signal leaves for example the main tube board to go to the front panel controls, it leaves via CON1 which is conected to CON14 (or whatever) on the front panel board. Usually there is also a reference to the board number

Unless someone removed all the various jumper cables inside, I rarely need to sort all that out. Once in a while I do when trying to find a break in the signal path.

I am looking at the DSL100 drawing for the main tube board, JCM2-60-00 and just to the right of V1 are CON13,CON3,CON14. Note just below those is a legend stating:
CON14->COIN6
CON13->COIN2
(etc)
All above on JCM2-61-00

That shows the matching connector on the 61-00 board, which is the preamp control panel board.

yes, it is clumsy.

Enzo,
Yeah I know why they do it that way, but they don't do it well, it must have been a nightmare for the PCB layout guy. I don't need a schematic for repair, there are some aspects of the tone I like so I was trying to see what was going on in the design.
Kelley

[Hardtailed]

Yeah, I'm pretty curious too as to what the "basic" circuit is in the different modes.

Hopefully the 1987/2204 hybrid I'm building can get me what I like about the DSL... and then some!

[Enzo]

Probably wasn't a nightmare for anyone. No one sat down with a pad and pencil and drew these things during design. These are drawn after the fact to document the design. A lot of this will be cut and paste from similar previous models anyway.

I would prefer one large drawing of the whole amp, sure, but once you understand what they are doing, I find them darn consistent.

COnsider the Peavey 5150 and their 5150-2 (the current 6505 and 6505+) The 5150 drawing set is like this Marshall (sorta) while the 5150-2 is one large schematic.

[plexibreath]

Probably wasn't a nightmare for anyone. No one sat down with a pad and pencil and drew these things during design. These are drawn after the fact to document the design. A lot of this will be cut and paste from similar previous models anyway.

I would prefer one large drawing of the whole amp, sure, but once you understand what they are doing, I find them darn consistent.

COnsider the Peavey 5150 and their 5150-2 (the current 6505 and 6505+) The 5150 drawing set is like this Marshall (sorta) while the 5150-2 is one large schematic.

It's not the multipage schematics, I've done layouts from 130+ page schematics with several 1300 pin BGAs, but at least they were drawn well. This thing is just a mess. Well, I'm about half way through drawing up something clean in Orcad.

[Enzo]

Please don;t pull a Joe Piazza on us and leave out the part numbers. I appreciate the effort Joe put in redrawing all those scjhematics, but it is maddening not to have the part numbers. SO much easier to refer to R132 and C125 than "the resistor between the plate of the third triode and the upper end of the treble control."

[plexibreath]

Please don;t pull a Joe Piazza on us and leave out the part numbers. I appreciate the effort Joe put in redrawing all those scjhematics, but it is maddening not to have the part numbers. SO much easier to refer to R132 and C125 than "the resistor between the plate of the third triode and the upper end of the treble control."

I always use reference designators when drawing a scumatic, I'm also using the same ref-des the Marshall schematic is using so it's easy to cross-reference to that schematic, which will make it a lot easier for others to check what I may miss. I'm using regular switch symbols to show the switching rather than LDRs and what-not, as this will strictly be for a theoretical understanding of the amp.

Kelley

[Enzo]

How about a little circle around such a switch, with an L next to it, or something to indicate its LDR form. Can't recall where, but some shcematic I bumped into use basic switch symbols for switches and relays (OK so far), but labelled them all with S numbers instead of S and K numbers. Was very hard to determine which switch was what form there.

[plexibreath]

I'm going to show switches, wherever possible, that are multi-pole packages, linked by dashed lines. Past that the switching system doesn't interest me, but I will let anyone who wants it to have a copy of the OrCAD file so they can edit it to show more detail if they want to. I'm going to have to put this schematic on the back burner for about a week because I'm under the gun on a different project, but it won't be long before I get back to it.

Kelley

[CRU JONES]

Hi Kelley,

I agree with you on those schematics. I have a TSL100 and still am a bit confused how it goes. Let me know if you share the OrCAD files. Maybe you would not mind if I edited them for a simplified version of the TSL.
Cru

[strat1953]

i have a jcm 200 dsl 60 and the jump cables have been removed anyone have pics or instructions as to where they go?? the 100 watt schematics i see online are different. it list s a connector 14 for example and this amp does not have that numbering ?/ help/

[g1]

As far as I know, if it is a DSL it is 50 or 100. 60 is a TSL. You will not be able to figure out without the correct schematics. Try here, under JCM2000DSL, : Marshall Amps Info & Schematics , or below this section is the TSL schematics.