Vectronics VEC-131K - Manual (Page 19)

VEC-131K Owner's Manual Aircraft Receiver Kit
17
Important Note: If you do not wish to use sockets with your kit, you may omit
them and mount the ICs directly into the board (an option experienced builders
may prefer). Sockets make IC removal easier in the event of an installation error
or component failure. If you elect to omit the sockets, mount the ICs with their
keys aligned as shown on the PC board.
! ! 15. Find the location for U1, and orient a socket so its keyed end
corresponds with the key marked on the PC board. Install carefully,
making sure all 8 pins clear the mounting holes. When the socket is
seated, tack solder (apply just enough solder to hold the part) a pin in
each of the two rows to hold the socket in place. Turn the board over
and confirm the socket is flush against the surface (if not, correct it).
When fully seated, solder all eight pins.
! ! 16. Using the above procedure, install and solder a socket at U2.
! ! 17. Install and solder a socket at location U3. Refer to step 15.
! ! 18. Install and solder a socket at location U4. Refer to step 15.
! ! 19. Carefully check all solder connections on the IC sockets. Watch for
unwanted solder bridges between adjacent pins.
! ! 20. Locate the NE602 IC. This part may be marked with “NE602N”, or
similar markings such as “SA602” or NE612, depending on the
source.
The IC body has a small notch, or key, molded at one end, indicating pins 1 and
8. A small dimple-like body-molding is often found adjacent to pin 1. Some IC
packages may include both key indicators.
1 2 3 4
8 7 6 5
Installation
Key
Key
Installation
Pin Numbers
! ! 21. Align the body of the NE602 to correspond with the key of socket U1.
Loosely insert the NE602 pins into socket U1. All 8 pins should fit
freely into the socket openings. If not, straighten the IC pins until
they do. Using firm and steady pressure, fully seat the IC into the
socket. The socket and IC keys both face capacitor C10.