WP-20 CONSTRUCTION DETAILS
It will be assumed at this point that you
have gathered all of the parts necessary to com-
plete construction.
The first phase of construction will in-
volve inserting and soldering parts onto the
printed Circuit Board (PCB). Before any sol-
dering is done, it is recommended that the cop-
per traces on the board be cleaned with an abra-
sive type household cleanser and thoroughly
rinsed and dried. This will insure that the
solder will adhere to the copper.
Start at the top left of the parts list
with the resistors. Notice that the first re-
sistor has a value of 330 ohms and that it's
part number is R20. Locate a 330 ohm resistor
and insert it at the point marked as R20 in
white letters on the PCB. Solder it in place
and trim off the excess leads with diagonal
cutters. proceed down the parts list in the
same manner. Some values will be used at sev-
eral different locations. For example, three
4.7K resistors are used at R21, R23, and R43.
IMPORTANT! Two resistors (R41 and R43),
one capacitor (C18) and one diode (D3) are not
to be mounted to the PC8.. These will be moun-
ted directly on the lugs of controls as shown
on the wiring pictorial.
After all resistors have been inserted and
soldered to the board, insert and solder the disc
capacitors, diodes, IC sockets, transistors and
electrolytic capacitors in that order. Be care-
ful to observe proper polarity for diodes and
electrolytic caps. Also be sure to properly
orient transistors and IC sockets according to
the letters and marks on the PCB.
The next step of construction will involve
laying out and drilling the holes in the case
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