Install The Optoisolator; Figure 3-Pin 1 Of The Opto-Isolator Is Indicated By The Dot And The Ridge In The Package; Figure 4-Although More Subtle, Notice That The Q4 Has A Square Side And A Round Side - DYNACO PWRAMP80 Assembly Manual

Install the optoisolator

The opto isolator comes in a 6-pin DIP (Dual Inline Package). Pin 1 on the PCB is
indicated by the square pad. Pin 1 on the opto-isolator package can be identified by the
dot on the package, refer to Figure 3. Make sure to install the opto with the correct
orientation.

Figure 3-Pin 1 of the opto-isolator is indicated by the dot and the ridge in the package

Opto isolator installation – watch the orientation!
Designation Type, Package
U1 4N35, 6 pin DIP

Figure 4-Although more subtle, notice that the Q4 has a square side and a round side

Rating, Marking, Description
4N35 opto-isolator
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