Sony CRF-230B - Page 25

CT408 CT407 CT405
Mw SW1 ose :
Mid tiamer MW rf trimmer
CT404
SW1 rf ‘lFT401
trimmer
iY
L404
SW1 rf coil
L401 \
SW1
ant
coil
=
trimmer
L409
L402
LW
osc
coil
LW
ant
coil
LW ant eee D,
L406 trimmer &
LW rf coil L403
: hs oS L405 MW ant coil
trimmer MW ff coil
Fig. 3-13 Adjusting parts location
3-8. SW2-SW19 1st IF ALIGNMENT, FREQUENCY COVERAGE AND TRACKING ADJUSTMENT
Preparation: yeu cee oy?
: . I na osc na asc
Rf Signal Modulation: trimmer trimmer coil :
1-kHz 30% amplitude-modulation 1 tional CT301 i. cP305 loc
Rf Signal Generator Coupling:
To hermetic terminal HT304 with 0.01uF
ceramic capacitor
VTVM Connection:
Across the coaxial cable (to cp circuit
board) through the 455-kHz amplifier
DC 4.5V Supply:
To feed-through capacitor CP305
generator
455 kHz
© amp
Fig. 3-14
Rf Signal
Generator Adjust Remarks
Frequency
Adjustment
Item
2nd osc coil
1.6 MHz L317
Frequency - Adjust for maximum meter
Coverage 2.2 MHz “a Bees aoe reading.
IFT 301
6 MMe IFT 302
Tracking CT301 - ditto -
1.6 MHz IFT 303
~ 2.2 MHz IFT 304
I-f Alignment