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Does anyone (probably someone who is Marshall authorized) have a PDF schematic for the last revision (issue 20) of the TSL100 mainboard? This is the drop-in replacement you can get from AES for $225.
I have a TSL 100 here from '04 that has had the board replaced with an Issue-20. It has some changes from all the earlier boards, most obviously that the LDR has been swapped for a relay. There are other changes to the channel-switching circuit too -- which is what's acting up in this amp. The old schematics (most recent I found online is issue 7) aren't really useful because so much has changed.
I have a TSL 100 here from '04 that has had the board replaced with an Issue-20. It has some changes from all the earlier boards, most obviously that the LDR has been swapped for a relay. There are other changes to the channel-switching circuit too -- which is what's acting up in this amp. The old schematics (most recent I found online is issue 7) aren't really useful because so much has changed.