Let's Get Technical > Troubleshooting Problems
MP1 1.38 - Is my Chorus failing???
skarkowtsky:
It's actually considered normal operation by Roland. It gets ripping hot!
Sticker that on the casing below.
MarshallJMP:
Like Harley already said, the tubes have nothing to do with the chorus, so very strange.
As for the pcb, that's normal with older pcb's. Seen this a lot with the older mp-1's and other older equipment, it came out of the factory looking like that. It has to do with HASL or hot air solder leveling, where a layer of tin is applied on the traces before the solder mask is applied. When it was not applied smoothly you got this wrinkling, it could also happen during the wave soldering if tin was drawn under the solder mask. Nothing to worry about.
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