![]() Do you have a Marshall guitar or bass tube amp that needs repair. The schematic for the FX loop buffer circuit is shown below with the same component designations as on my amplfier. The DSL 50/100 amplifiers use a number of dual op-amp integrated circuits to reduce total chip count and cost of the PCBs. JCM2000 Marshall DSL 50 / 100 FX Loop Modification. All the downloadable content on this website has been scanned thoroughly for viruses. We make every effort to ensure the information contained here is as accurate as possible, but we will not be responsible for any errors or omissions, or anything resulting thereof.Īll information on this website is supplied free of charge, in good faith and without warranty. ![]() This Website contains a compilation of information already available elsewhere on the internet and therefore considered to be in the public domain. ![]() We have 558 Marshall Diagrams, Schematics or Service Manuals to choose from, all free to download! Disclaimer Brand names and product names are the property of their respective owners. The other difference I noticed are C6 and C37 are on the board both electrolytic (they have been replaced with 10uf 450v) which I guess is incorrect as C37 on the schematic states 47uf 63v so again too many inconsistencies to be able to rely on any versions of the schematic.Sponsored Links Please select your desired model below. There are other proven factory differences between the board and the earliest schematics so for that side of things I think everything is fine. am I getting the right AC readings off the PT? If so, since the amp has obviously been tampered with in the past by someone else, did they solder the PT LV wires to the right lugs on the board? W9, W10 and W11 are the lugs used on the board but on the schematic these lugs are denominated W11, W12 and W13. So I replaced them but still the same readings. On the other sides of D8 and D9 I'm getting around -58vDC and on the other side of D6,D7 I'm getting 0. So tracking from the PT LV lugs I'm getting around 21vAC through to the rectifier diodes D6, D7, D8 and D9. HT, heaters and bias voltage seem to be ok. I tried powering up the amp just to see if it was working at all.it does sound very flimsy and bad so powered off and proceeded to do some tests. Anyways I'll state my findings, initial problem is that the channel switching doesn't work at all, the LED doesn't turn on either.so basically its stuck on the clean channel. I have an early version of the DSL50 jcm2000 amp to which there is no reference anywhere.printed out the schematics I could find but there are too many differences in denomination of the components and wiring lugs. ![]()
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