Velleman-Kit K4500 Mode D'emploi page 18

TEST AND ADJUSTMENT
Mount the fuse (0.25 A) in the fuse holder and cover it with the special cap.
Connect the tuner to the network.
VERY IMPORTANT: When the tuner is connected to the mains, all components
on the base board receive live voltage, even when the start/stop switch is on
the "stop" position! NEVER FORGET TO CUT THE MAINS when you replace
components.
ADJUSTING THE INTERMIDIATE FREQUENCY
- Push the start/stop switch; normally the display should light up and indicate a
frequency.
- Attach an antenna or cable to one of the antenna inputs.
- Select the desired antenna (Y or C) using the antenna selector. You will hear
the switching of the relay.
- Turn the RV1 "STOP SENSITIVIY" potentiometer as far as it will go,
clockwise (seen from the rear).
- Push "auto" until the MONO indication lights up.
- Select a known frequency from a powerful transmitter around 97 MHz, and
regulate using the "SEEK" pushbuttons. The LD14 diode should normally
extinguish.
- Attach a measuring device (preferably a digital device intended for
continuous voltage) between points TP1 and TP2.
- Screw the LC2 coil entirely in, using a screwdriver (preferably with a plastic
handle).
- Turn LC1 until the meter indicates 0 V (take the smallest measurement range
possible); the LD 15 diode should normally light up.
- Now cut the JSTP jumper.
- Turn the LC2 until the LD15 diode is extinguished; continue turning until the
LD15 diode lights up again and the voltometer indicates 0 V.
- Remove the measurement device. If you must adjust the intermidiate
frequency regulation again for any reason, you must make the
interconnection at the jumper.
ADJUSTING THE STEREO PILOT-TONE
-Select a known stereo transmitter.
-Turn the RV2 "PILOT TONE ADJUST" regulation potentiometer as far as it will
go, COUNTER CLOCKWISE.
-Push "auto" until the MONO indication is extinguished.
-Turn the RV2 carefully until the stereo indicator just lights up.
Mark the position of the trimming potentiometer with a pencil.
-Push "AUTO" until the MONO indication lights up.
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