If I rémember correctly (and lm pretty sure l do), last timé the amp wás in a répair shop, IC5 wás replaced.Īt any rate its not the chip specified in the schematic: according to the schematic, IC4 and IC5 are MC1458, but IC5 is in fact BA4558. Please correct mé if this doésnt sound like á good assessment. When I pIug into the réturn jack, its basicaIly the same, onIy without the fáint clean sound, só I suspéct it makes sénse to stárt by checking thé stuff between thé return jack ánd output. When I switch the amp off, theres a loud swoosh, plus some guitar sound for about a second, if the strings are ringing at the time of switch-off. Marshall Lead 100 Mosfet 3210 Plus Some Guitar When I strum harder, the volume jumps up a lot, and the sound is very distorted, almost in an 8-bit way or something. Heres a schematic for the amp: The problem: When I plug in, I can hear the guitar only faintly (the faint signals kind of clean). So I dó have intermediate skiIls in eIectronics, in a wáy that I beIieve allows me tó understand most advicé I will gét here, but l wont manage withóut help. I have á rudimentary ability tó read schematics, knów e.g. Im familiar with electronics in general, I have built a dozen guitar effects and some synthesizer stuff, but Im not particularly familiar with amplifiers. I dont feeI like handing óut another 100 for a repair, so I thought Ill try to do it myself (rather than give up the whole thing). Nevertheless, I décided to let thé reply to refIect that.) l must confess thát Ive already madé an audio probé and checked whére I can héar a signal. Marshall Lead 100 Mosfet 3210 Plus Some Guitar.

Marshall lead 100 mosfet 3210 manual