Heathkit IT-12, Assembly Manual, Page: 9 / 30

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In the step-by-step procedure the abbreviation "NS" indicates that the connection should not be soldered as yet, for other
wires will be added. "When the last wire is installed, the terminal should be soldered and the abbreviation "S" is used to
indicate this. Note that a number appears after each solder (S) instruction. This number indicates the number of leads
connected to the terminal in question. For example, if the instructions read, "Connect one lead of a 47 KO resis-tor to lug
1 (S2)" it will be understood that there will be two leads connected to the terminal at the time it is soldered. This
additional check will help avoid errors.
Use lockwashers under all 6-32 and 8-32 nuts. Lockwashers should be placed between controls and the chassis.
Whensolder lugs are mounted under 6-32 nuts, the use of lockwashers is unnec-essary.
Don't apply too much solder to the solder joint. Don't apply the solder to the iron only, expecting that it will roll down to
the connection. Try to follow the instructions and illustrations as closely as possible.
Don't bend a lead more than once around a connecting point. If it should have to come off due to a mistake or for
maintenance it will be much easier to remove.
Keep your soldering iron clean. Wipe it quickly from time to time with steel wool or a rag.
When two or more connections are made to the same solder lug a common mistake is to neglect soldering the connections
on the bottom. Make sure all the wires are soldered.
HOW TO MAKE PROPER SOLDER CONNECTION
Take these precautions and use reasonable care during assembly of the kit. This will insure the wonderful
satisfaction of having the instrument operate perfectly the first time it is turned on.