Vectronics VEC-1012K User Manual
Page 18
VEC-1012K Owner’s Manual
18
If your radio didn't pass the turn-on test, don't despair. Odds are, you've
overlooked something minor that's easy to correct. Take a break, come back
fresh, and carefully repeat the QC inspection. If no undiscovered errors turn up
during your second inspection, proceed to the "In Case of Difficulty" section of
this manual for troubleshooting advice.
Pre-Alignment:
You'll need the following items to adjust your receiver:
•
6-32 screw, at least 3/4" long, to check the shaping of L1, L2.
•
Insulated hex-head tuning wand to adjust L4.
•
Small flat-blade screwdriver or tuning wand to adjust L5.
•
Voltmeter, digital or analog, to adjust L5.
•
Antenna to receive off-air signals.
The instructions below describe how to pre-adjust each of the radio's coils for a
ballpark setting. This procedure will make final alignment easier.
1. Locate coils L1 and L2. Thread a 6-32 screw inside the windings of each
coil to check for sizing and spacing. If each winding conforms to the 6-32
diameter and thread-pitch, the coil is wound correctly. If not, make any
needed adjustments. Spread the turns so they are exactly 1 wire-width apart.
2. Make a small flag from a scrap of tape and install it on the hex-head tuning
wand. This will help you count revolutions as you adjust L4.
3. Locate tunable-oscillator coil L4. Insert the tuning wand and rotate the slug
counter-clockwise so the top surface is perfectly flush with the top of the
metal shield can. Now, watching the tape flag and counting revolutions,
rotate the slug 4 turns clockwise down into the body of the coil.
4. Set your voltmeter range to 10 Volts dc and connect the black (-) lead to a
ground point on the PC board. Locate pin # 17 on U1 (see the following
diagram). This is the test point for adjusting L5.
FL1
Test Point, 2.3 V
U1, MC13135
5. Set all front-panel controls on the radio counter clockwise, install a 9-volt
battery on the battery snap clip, and apply power via the OFF/ON switch. No
antenna should be connected during this test. With power applied, touch the