2
PR-40A PC Board Assembly
NOTE: Since all of the holes on the PR-40A PC board have been plated thru,
it is only necessary to solder the components from the bottom side of the board,
unless otherwise noted. The plating provides the electrical connection from the
"BOTTOM" to the "TOP" foil of each hole. Unless otherwise noted it is important
that none of the connections be soldered until all of the components of each
group have been installed on the board. This makes it much easier to interchange
components if a mistake is made during assembly. Be sure to use a low wattage
iron (not a gun) with a small tip. Do not use acid core solder or any type of
paste flux. We will not guarantee or repair any kit on which either product has
been used. Use only the solder supplied with the kit or a 60/40 alloy resin core
equivalent. Remember all of the connections are soldered on the bottom side of
the board only. The plated-thru holes provide the electrical connection to the
top foil.
( )
Before installing any parts on the PR-40A circuit board, check both
sides of the board over carefully for incomplete etching and foil
"bridges" or "breaks". It is unlikely that you will find any but should
there be one especially on the "TOP" side of the board it will be very
hard to locate and correct after all of the components have been
installed on the board.
( )
Attach all of the resistors to the board. As with all other components
unless noted, use the parts list and component layout drawing to locate
each part and install from the "TOP" side of the board bending the
leads along the "BOTTOM" side of the board and trimming so that 1/16"
to 1/8" of wire remains. Solder. You should have one 1M ohm resistor
left over.
( )
Install all of the capacitors on the board. Be sure to orient the
electrolytic capacitors correctly. The polarity is indicated on the
component layout drawing. Solder.
( )
Install integrated circuits IC3 thru IC17 on the circuit board. The
integrated circuits must be turned to match the outlines shown on the
component layout drawing. Solder.
( )
Install fuses F1 thru F7 on the circuit board. Solder.
( )
Install the diodes and transistors on the circuit board. Transistors Q1
thru Q7 must be mounted vertically with the bottoms of the transistors
about 3/16" above the top of the board. These components must be turned
to match the outlines shown on the component layout drawing. Solder.
( )
Insert the twelve male PC mount pins into the 12 pin Molex female
connector shell. The pins are inserted from the back or numbered side
of the connector. Orient the shell as shown in the component layout
drawing and mount it in the J1 connector position. Solder.
( )
Insert female receptacle J2 into the PC board making sure to orient it
as shown in the component layout drawing. The small notches on the
inside of the connector must point toward the edge of the board as
shown in the component layout drawing. Solder.
( )
Insert Molex receptacle J3 into the PC board making sure to orient it
as shown in the component layout drawing. The notches on the connector
must point toward the edge of the PC board as shown in the component
layout drawing. Solder.