Vectronics VEC-1016K, Руководство пользователя

Страница: 14 / 23

Tie-wrap
Stress Relief
Finally, install receiver ICs U1 and U2. Before doing this, inspect both devices carefully
and straighten any bent or crooked pins. Use extreme care during insertion, and move
slowly. It's very easy to miss a pin opening and fold a IC pin underneath the body of the
device.
Locate U2, the MC34119 audio-amplifier IC (8 pins). Position its keyed (or notched) end
to correspond with the key marked on the pc board at U2. Carefully align the pins with
the U2 mounting holes before inserting.
[ ] Install the MC34119 IC at U2, checking carefully that all 8 pins enter their respective
mounting holes. Solder each pin in place.
Locate the MC13135 Receiver IC (24 pins). Position the keyed end to correspond with
the key marked on the pc board at U1. Carefully align the pins with the U1 mounting
holes before inserting.
[ ] Install the MC13135 IC at U1 and solder each pin in place.
Inspect the pads under both ICs carefully for solder bridges and cold-solder (use a
magnifying glass, if available). Correcting any problem before proceeding. This
concludes the construction phase of your receiver. You deserve a break! When you
come back, be ready to give your work a thorough "QC" quality control check before
moving on to the testing and alignment section.
(9 Testing and Alignment)
PC Board Inspection: Even the most experienced builders make mistakes! Before
applying power to your kit, give it a thorough QC (quality control) inspection. This will
help you find inadvertent assembly errors that might prevent the radio from working or
cause damage to sensitive parts. Follow this procedure: