Panasonic RX-FS400 - Measurements and Adjustments; General Alignment Setup; FM and AM Alignment Procedures; Tape Speed and Head Azimuth Adjustment

RX-FS400 RX-FS400
MEASUREMENTS AND ADJUSTMENTS
@ ALIGNMENT INSTRUCTIONS
READ CAREFULLY BEFORE ATTEMPTING ALIGNMENT
1. Set volume control to maximum.
2. Set tone control to TREBLE.
3. Set band switch to AM or FM ST.
5. Set power source voltage to 9 V DC.
6. Output of signal generator should be no higher
than necessary to obtain an output reading.
4. Set function selector to RADIO or TAPE.
@ AM-IF ALIGNMENT
SIGNAL GENERATOR or
—_ SWEEP GENERATOR RADIO DIAL
SETTING
455 kHz Point of non-
Fashion a loop of
Ciena | eee: foe
g at 400 Hz
the loop ant. of receiver. 600 kHz)
@ AM-RF ALIGNMENT
Fashion a loop of
several turns of wire 511 kHz
and radiate a signal into
the loop ant. of receiver.
fully closed.
1,500 kHz
(*1) Fix antenna coil with wax after completing —_
@ FM-IF ALIGNMENT
SIGNAL GENERATOR or
SWEEP GENERATOR RADIO DIAL
SETTING
Connect
to
test
point
Point
of
interference
(on/about
through ceramic
capacitor (0.001 LF)
Negative
side
to
test
90
MHz)
point Suz.
Adjust for maximum
Lf Lt. tf! oe amplitude. (Refer to Fig. 3.)
@ FM-RF ALIGNMENT
10.7 MHz
(SWEEP)
Tuning capacitor
1.753 kHz Tuning capacitor
fully open.
INDICATOR
(ELECTRONIC
VOLTMETER or ADJUSTMENT REMARKS
OSCILLOSCOPE)
Headphones Jack
(32)
oun dea a nainan | T2(AMIFT) Adjust for maximum output.
connect the lead wires of
the plug to the measuring
instrument.
L4 (AM OSC
Coil)
CT1 -4 (AM OSC ”
Trimmer)
Adjust for maximum output.
oe
ae
Adjust
L3
by
moving
coil
along
the ferrite core.
cm -3 ANT
Adjust for maximum output.
Adjust for maximum output.
INDICATOR
(ELECTRONIC
VOLTMETER or
OSCILLOSCOPE)
ADJUSTMENT REMARKS
Connect vert. amp.
scope to test point
BiZJ. Negative side
to test point [G2
Adjust for maximum
T1
(FM
1st)
amplitude.
(Refer
to
Fig.
2.)
Connect to test point
through FM
dummy antenna.
Negative side to test
point fiz.
Variable
109.2 MHz capacitor fully
open.
Variable
capacitor fully
closed.
86.2 MHz
(*2) Three output responses will be present; proper tuning is the center frequency.
Headphones Jack
(32Q) L2 (FM OSC (*2) Adjust for maximum
Fabricate the plug as coil) output.
shown in Fig. 4. and then
connect the lead wires of
the plug to the measuring
instrument.
CT1-2 (FM OSC
Trimmer)
CT1-1 (FM ANT
Trimmer)
ore
m@ SEPARATION ALIGNMENT
EQUIPMENT
CONNECTION
ELECTRONIC
COUNTER
GGZ3...(+)
bied...(-)
FM SIGNAL GENERTOR
SOURCE CONNECTION
ADJUSTMENT SPECIFICATION REMARKS
98 MHz, 60 dB (CW) Connect to
test point through FM
dummy antenna.
Negative side to §G¥.
Adjust VR1, for 19 KHz +50 Hz reading
on frequency counter.
@ HEAD AZIMUTH ALIGNMENT
EQUIPMENT CONNECTION
TEST TAPE ELECTRONIC COUNTER ADJUSTMENT | SPECIFICATION _ REMARKS
Headphones Jack (32Q)
fetes the plug shown in Fig. 4. and
(0)
Azimuth screw
(Shown in Fig. 5)
. QZZCFM |
(8
kHz,
—20
dB)
Maximum
output
Playback mode.
then connect the lead wires of the plug t y
the measuring instrument.
@ TAPE SPEED ADJUSTMENT
EQUIPMENT CONNECTION
TEST TAPE ELECTRONIC COUNTER ADJUSTMENT SPECIFICATION REMARKS
Headphones Jack (32Q) 1. Playback mode.
QZZCWAT Fabricate the plug shown in Fig. 4. and Motor VR 3000+70 Hz 2. Adjust motor VR, for 3000+70 Hz
(3 kHz) (er connect the lead wires of the plug to | | (Shown in Fig. 6) reading on frequency counter
the measuring instrument. .
m@ ALIGNMENT POINT
ePlease refer to Circuit Board and Wiring Connection Diagram for test point locations.
FM OSC FM ANT AM ANT AMIFT AM ANT
1O9.2MHz IOGMkH I5OOkHz 455kHz 600 kHz
AM OSC \ At
1753 kHz
CTI-4
CT
1-4)
WN
y
Fig.
2
“0 UI
FM ist iar
10. 7MH FM VCO
I9kHz+50Hz
TI ® %,
®| @)
AM OSC
SilikHz
Fig. 3
~ Motor
—- To Measuring
— Instrument
Azimuth Screw
Fig. 5 Motor VR
Fig. 6
ee eee