Toshiba RT-S652 - SW Band Receiver Alignment; FM Receiver IF and RF Alignment

| RT—S652
SW ALIGNMENT CHART
Signal
Generator Radio Dial Setting Adjustment Remarks
Frequency
Tuning Gang Fully Counter-
5.75 MHz clockwise
(Lowest Frequency)
OSC. Coil Adjust for maximum ‘
L106 indication.
Tuning Gang Fully Clockwise OSC. Trim. Adjust for maximum
Toe (Highest Frequency) C011 indication.
Repeat steps 1 and 2 as required.
Ant. Coil Adjust for maximum
L102 indication.
Ant. Trim, ’ Adjust for maximum
Ccoo9 indication.
6.5 MHz Tune to Signal.
14 MHz No Adjustment
Repeat steps 4 and 5 as required.
FM-IF ALIGNMENT
. Set the select switch to FM position.
. Turn on both sweep generator and oscilloscope, and allow a fifteen-minute warm-up period.
. Connect the RF SWEEP SIGNAL OUTPUT from the signal generator through the loop antenna to the receiver.
. Connect the oscilloscope vertical input directly to the test point TURN OUT H and connect the shielded lead to
the test point E or chassis ground. :
5. Connec the SWEEP VOLTAGE OUTPUT of the sweep generator to the oscilloscope.
6. Proceed as outlined in the FM-IF ALIGNMENT CHART.
PWN =
FM-IF ALIGNMENT CHART
Signal coupling Equip. Tuning Connection Pattern
Connect sweep Sweep Tuning Knob | Set scope for con- Turn the !F Transformer
generator output to | generator of | fully counter- | necting output L111 fully counterclock-
a three-turn loop 10.7 MHz clockwise signal from TUN wise to obtain a single
antenna of 10cm center freq. (Lowest OUT to vertical peak. Adjust coil L105
diameter. with 10.7 Frequency.) axis of scope “V"’ in order until the best
MHz marker. and sweep gener- single peak is obtained.
ator output to Figure 9.
horizontal axis Finally turn the coil
“H", L111 to obtain S curve.
See Figure 10.
IF Seeep Test
FM
Sweep
Receiver
S
Curve
Generator
under
test
ae
aS
Figure
8.
-
F
igure
3-turn
Loop
Antenna
located
near
the
LOO2.
Figure
9.
Figure
10.
FM-RF ALIGNMENT
1. Turn on the signal generator and the VTVM, and allow a fifteen-minute warm-up period.
2. Connect the signal generator output through a 75 ohm dummy antenna across FM ANT.
3. Connect the VTVM across the voice coil or a 3.2 ohm dummy load.
4. Set the volume control to mid-position. 7