Panasonic RX-CT900 - Measurements and Adjustments; General Alignment Instructions; Radio Frequency and IF Alignment

Penne
RX-CT900 RX-CT900
MEASUREMENTS AND ADJUSTMENTS
@ ALIGNMENT INSTRUCTIONS
READ CAREFULLY BEFORE ATTEMPTING ALIGNMENT
5. Set power source voltage to 15 V DC.
6. Set G.E.Q. control to center.
7. Output of signal generator should be no higher
than necessary to obtain an output reading.
. Set volume control to maximum.
. Set FM mode selector switch to FM ST.
. Set band switch to AM/FM/LW.
. Set function selector to TUNER or TAPE.
koh =
@ AN-IF ALIGNMENT
SIGNAL GENERATOR or INDICATOR
SWEEP GENERATOR RADIO DIAL (ELECTRONIC
—|
“seTTING
VOLTMETERor
|
(Noter
to
ala
REMARKS
CONNECTIONS
FREQUENCY
OSCILLOSCOPE)
9.
9
Headphones Jack
Fashion a loop of : Point of non- (32Q)
several turns of wire ene interference Fabricate the pl
a i abricate the plug as . 3
and
radiate
a
signal
into
30%
Mod.
(on/about
shown
in
Fig.
1.
and
then
T3
(AM
IFT)
Adjust
for
maximum
output.
;
at
400
Hz
connect
the
lead
wires
of
the loop ant. of receiver. 600 kHz the plug to the measuring
instrument.
m@ MW-RF ALIGNMENT
m@ FM-RF ALIGNMENT
ADJUSTMENT
(Refer to Fig. 5.)
REMARKS
3.041.0V
7.041.0V
L3 (FM ANT
* Coil)
SIGNAL GENERATOR or INDICATOR
SWEEP GENERATOR RADIO DIAL (ELECTRONIC
SETTING VOLTMETER or
CONNECTIONS
FREQUENCY
OSCILLOSCOPE)
te to test point
aiag through FM : Macys...(+)
dummy
antenna.
87.50
MHz
Tune
to
signal
ry
(-)
Negative side to test
point fied.
Headphones Jack
(32Q)
u 90.00 MHz Seine, ee
connect the lead wires of
the plug to the measuring
instrument.
; hues ie i
(*2)
Four
output
responses
will
be
present;
proper
tuning
is
the
center
frequency.
m@ SEPARATION ALIGNMENT
EQUIPMENT
FM SIGNAL GENERTOR
SOURCE CONNECTION
CONNECTION
ELECTRONIC
COUNTER
(*1) Fix antenna coil with wax after completing alignment.
98 MHz, 60 dB (CW) Connect to
test point [GXI through FM
dummy antenna.
Negative side to fy.
m@ LW-RF ALIGNMENT
ADJUSTMENT
(Refer to Fig. 5.)
CT1 (FM ANT
Trimmer)
SPECIFICATION
(*2) Adjust for maximum
output.
REMARKS
Fashion
a
loop
of
:
several
turns
of
wire
520
kHz
Tuning
capacitor
er
...(+)
L6
(MW
OSC
Adjust
L6,
for
1.2+0.3
V
and
radiate
a
signal
into
fully
closed.
a4
...(—)
Coil)
reading
on
DC
voltmeter.
the
loop
ant.
of
receiver.
"
4.710
kHz
Tuning
capacitor
i
CT5
(MW
OSC
Adjust
CT5,
for
9+0.3
V
,
fully
open.
Trimmer)
reading
on
DC
voltmeter.
Headphones
Jack
(32Q)
.
F
;
A
Adjust
for
maximum
output.
”
.
f
1
oS
.
.
A
600
kHz
Tune
to
signal
coke.
anche
ean
TANT
Adjust
L9-1
by
moving
coil
along
connect
the
lead wires
of
the
ferrite
core.
the
plug
to
the
measuring
instrument.
"
"
;
CT2
(MW
ANT
.
‘
1,400
kHz
Trimmer)
Adjust
for
maximum
output.
@ FN-IF ALIGNMENT
SIGNAL GENERATOR or
SWEEP GENERATOR
CONNECTIONS FREQUENCY
Connect to test point
EE-ZEM through ceramic
capacitor (0.001 JF).
Negative side to test
point iG.
10.7 MHz
(SWEEP)
RADIO DIAL
SETTING ©
Point of
interference
(on/about
90 MHz)
m@ FM DC BALANCE ALIGNMENT
FM SIGNAL GENERTOR
SOURCE CONNECTION
98 MHz, 60 dB (CW) Connect to
test point GX] through FM
dummy antenna.
Negative side to fiigd.
EQUIPMENT
INDICATOR
(ELECTRONIC
VOLTMETER or
OSCILLOSCOPE)
Connect vert. amp.
scope to test point
Biixa- Negative side
to test point GK.
T1 (FM 1st)
T2 (FM 2nd)
ADJUSTMENT
(Refer to Fig. 5.)
CONNECTION
ELECTRONIC
COUNTER
Enzd..(-+)
fad -..(-)
ADJUSTMENT
(Refer to Fig. 5.)
SPECIFICATION
0+30 mV
=17=
REMARKS
Adjust for maximum
amplitude. (Refer to Fig. 2.)
Adjust for maximum
amplitude. (Refer to Fig. 3.)
REMARKS.
Adjust T2, for 0+30 mV reading on.DC
voltmeter.
Connect to test point
Eisi through FM
dummy antenna.
Negative side to test
point fia.
"
288 KHz
Tune to signal
146 kHz
162 kHz
270 kHz
@ HEAD AZIMUTH ALIGNMENT
TEST TAPE
QZZCFM
(8 kHz, —20 dB)
EQUIPMENT CONNECTION
ELECTRONIC COUNTER
Headphones Jack (320)
Fabricate the plug as shown in Fig. 1.
and then connect the lead wires of the
plug to the measuring instrument.
INDICATOR
Adjust VR1, for 19 kHz +50 Hz reading
on frequency counter.
Headphones Jack
(32Q)
Fabricate the plug as
shown in Fig. 1. and then
connect the lead wires of
the piug to the measuring
instrument.
”
q
bo
(*3) Four output responses will be present; proper tuning is the center frequency.
ADJUSTMENT
L7
(LW OSC Coil)
L9-2 (LW ANT
Coil)
CT3 (LW ANT ”
Trimmer)
SIGNAL GENERATOR or
SWEEP
GENERATOR
RADIO
DIAL
(ELECTRONIC
:
SETTING
VOLTMETER
or
|
(Heterte
hig
5)
REMARKS
CONNECTIONS
FREQUENCY
OSCILLOSCOPE)
oy
' 8.0 V+0.5 V
(*3) Adjust for maximum
output.
1. Test equipment connection is shown in Fig. 7.
Azimuth screw
(Shown in Fig. 4)
~18—
2.
Playback
the
azimuth
adjusted
part
(8
kHz,
—-20
dB)
of
the
test
tape
(QZZCFM)
and
regulate
the.
angle
adjusting
screw
so
that
the
outputs
of
L-CH
and
R-CH
are
maximized.
(When
the
adjusting
positions
are
different
with
L-CH
and
R-CH,
find
a
position
where
the
outputs
of
L-CH
and
R-CH
are
balanced,
and
then
make
the
adjustment.)
3.
At
the
same
time,
draw
a
lissajous
waveform
and
eliminate
phase
deflection.
(Shown
in
Fig.
7.)
. After the adjustment, apply screw-lock to the angle
adjusting value.