Speed Selector Switch On SQ TL 542s
I did not say not to change speeds when the machine is running, and I dough that it will make much difference if you do, often when we have seen these switches fail the customer reports that they never change this switches setting at all. I suppose that if you sat there and flipped the switch from setting to setting constantly it might shorten its life, but even if it is never changed a lot of current is going through the contacts and terminals of this switch and it could fail anyway.
I did not say not to change speeds when the machine is running, and I dough that it will make much difference if you do, often when we have seen these switches fail the customer reports that they never change this switches setting at all. I suppose that if you sat there and flipped the switch from setting to setting constantly it might shorten its life, but even if it is never changed a lot of current is going through the contacts and terminals of this switch and it could fail anyway.