Marshall DSL40CR schematic needed

[xtian]

I downloaded the DSL40C schematic that's everywhere, but the component labels are completely wrong for the new DSL40CR model. Anyone have?

BTW, main board has number DSL100M2-60-00-V6A, and plate resistor on V1A is numbered R115.

Anyone have luck asking Marshall directly? I emailed them, and I'll try calling Bletchley tomorrow.

[SoulFetish]

DSL40-60-02-v02.pdf

[SoulFetish]

DSL100-60-02-v02.pdf
iss7&iss10.pdf

[xtian]

Thanks, man...still, those don't match my PCB. Makes tracing the signal tough.

[xtian]

Marshall will not release the schematic to me, nor even to Guitar Center (I'm a "registered repair station" for GC). BUT, the nice tech at US MUSIC (800) 877-6863, helped me find an open cathode resistor R80 on the V3B cathode follower, and that solved the problem!

[the3secondrule]

Hey Xtian,

I realise this an older post, but I currently have 2 DSL40CR's on my bench with an open R80 resistor. Will replace them shortly but wondering if that was all it took to bring your amp back?

Cheers,

J

[g1]

R80 is the cathode resistor (100K) for the cathode follower stage. That resistor going open would kill the signal completely.
If the Marshall tech suggested it to xtian, then it is a known problem. I would guess that it does not have a sufficient voltage rating. A larger physical part will usually have a higher voltage rating (and wattage). Not sure if this is surface mount type parts or standard through-hole? Suggest using a 1W part that is physically larger than the stock item.

[xtian]

R80 is the cathode resistor (100K) for the cathode follower stage. That resistor going open would kill the signal completely.
If the Marshall tech suggested it to xtian, then it is a known problem. I would guess that it does not have a sufficient voltage rating. A larger physical part will usually have a higher voltage rating (and wattage). Not sure if this is surface mount type parts or standard through-hole? Suggest using a 1W part that is physically larger than the stock item.

Very good. Nothing to add.