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Confirm that the optocoupler is a NSL-32 and that the dot is in the correct position.  I cannot tell from the photo.

Report all pin voltages using the standard numbering format as stated in the guides.  Pin 4 should be ground (0V) and pin 7 about 9V.

The LED should be blinking at a rate controlled by the SPEED pot.

The KILL switch SW2 should pass a fixed voltage set by the BLEVEL trimmer.  This should be close to 9V at the NSL-32.  When SW2 is in the operating position, the voltage at NSL-32 should be varying.

WIthout a photo of the back, we cannot see if you have a bad solder joint.  You can remove power and the ICs and resolder all joints including switches and pots.