Panasonic RX-C45LS - Measurements and Adjustments

=> Ger TRS RX-C45LS RX-C45LS
MEASUREMENTS AND ADJUSTMENTS NDERTOR m ALIGNMENT
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BAND
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area:
ADJUSTMENT
REMARKS
MAIN
CIRCUI
FM-RF ALIGNMENT
Variable Output meter L7 (FM OSC (*2) Adjust for maxi-
capacitor across Coil) mum output.
fully closed. voice coil.
Connect to test point Variable
WV through FM dummy capacitor ” CT3 (FM OSC
antenna. Negative fully open. Trimmer)
LW ANT
285kHz
LW Osc
Lw osc
136kHz 297kHz
un pac (S|, @
Lg
Be le
ausse O©)
READ CAREFULLY BEFORE ATTEMPTING ALIGNMENT
. Set volume control to maximum. . Set fine tuning to center.
. Set graphic equalizer to center. . Set mode switch to stereo.
. Set band switch to LW, MW, SW or FM. . Set power source voltage to 12 V DC.
. Set balance control to center. . Output of signal generator should be no higher than
. Set function switch to radio. necessary to obtain an output reading.
m@ LW, MW and SW ALIGNMENT
side to test point Y .
Tune to signal. L5 (FM ANT
Coil)
i
2) Adjust for maxi-
SIGNAL GENERATOR or INDICATOR ft
i CT2 (FM ANT mum output. Sw OSC
SWEEP GENERATOR RADIO DIAL (ELECTRONICS ‘ 5.75 MHz
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CONNECTIONS FREQUENCY or SCOPE) :
AM IFT
455kHz
AM-IF ALIGNMENT
Fashion loop of
several turns of 455 kHz Point of non- Output meter Adjust for maximum
wire and radiate 30% Mod. interference. (on/ across voice coil. T2 (AM IFT) output.
signal into loop of at 400 Hz about 600 kHz)
receiver.
LW-RF ALIGNMENT
i 136 kHz Tuning capacitor a L8 (LW OSC 7
fully closed. Coil)
7 297 kHz Tuning capacitor CT7 (LW OSC i
fully open. Trimmer) antenna.
Adjust for maximum Reed side to test
145 kHz Tune to signal. (*1) L2 (LW output. Adjust L2 by P :
ANT Coil) moving coil bobbin
Se @ AUDIO ADJUSTMENT
Adjust
for
maximum
ITEM
INPUT
MEASUREMENT
|
SPECIFICATION
ADJUSTMENT
REMARKS
CT5
(LW
ANT
output.
POINT
POINT
Trimmer) Repeat steps
(9) QZZCAC Maximum
MW-RF ALIGNMENT Azimuth (10 kHz, EXT SP output. Azimuth screw Playback mode
511 kHz i L9 (MWOSC Adjust for maximum 208)
luliotsed cll allel Playback QZZCLA oe VR101 (Lch) Playback mode
1,650 kHz Tuning capacitor 7 CT4 (MW OSC 7 level (315 Hz, 0 dB) Sen 420 mV VR201 (Rech)
fully open. Trimmer) at
Adjust for maximum ;
550 kHz Tune to signal. (*1)L3(MW ANT | output. Adjust L3 by Bias Record mode
2)~(5
Coil) moving coil bobbin oscillation ie 66.2+0.5 kHz Beat proof switch—|
(*1) Cement antenna bobbin with wax after completing alignment.
(1)
=
el
FM SIGNAL EQUIPMENT
GENERATOR CONNECTION ADJUSTMENT SPECIFICATION REMARKS
SOURCE ELECTRONIC
CONNECTION COUNTER
Adjustment of | 98 MHz, 60 dB (CW) Sac Adjust VR1, for 19 KHz
pilot signal. Connect to test point ae VR1 (+100 Hz) reading on
WV through FM dummy electronics counter.
along ferrite core. frequency Tape switch— Metal
Adjust for maximum Record mode
140 +10 mv VR301 Beat proof switch—|
Tape switch— Metal
Use metal
tape
CT1 (MW ANT output.
Trimmer) Repeat steps
(6)~(9).
= = =| =
Metal
SW-RF ALIGNMENT Bias Use metal Metal 4.0+9-2MV | vR102 (Lch) Record mode
current tape 0.4 VR202 (Rch) Beat proof switch |
(10)
(11)
Normal Normal VR304 Tape switch—> Metal
5.75 MHz Tuning capacitor L10 (SW OSC Adjust for maximum
fully closed. Coil) output.
- - 2.0+0.2 mV
: 18.8 MHz Tuning capacitor 7 CT8 (SW OSC
Connect to test point fully open. Trimmer)
VW through ceramic
capacitor (10 pF)
Negative side
to test point Y . ; :
Adjust for maximum
(12) 5.9 MHz Tune to signal. L4 (SW ANT output.
Coil) Repeat steps
(10)~(12).
Qn! on
| 2
. Apply a —57 dB (1.4 mV) 1 kHz
signal from the DIN input
terminal.
2. Measure the output voltage of
pins © and @ of IC5.
3. Then, with the unit in the record
in the level.
(Adjust to obtain 0+1 dB.)
*Output voltage reference value of
iit, | “Guat a, Playback ocd par
Overall
gain
—57
dB
Pin@...(+)Lch
|
Output...
+Omv
Gan
ny
End
measure
the
cumeutvoliage
@
FM
ALIGNMENT
ut,
(+)
Leh
Pin®...
{3}
Reh
of
pins
©
and
@
of
IC5.
BAND
SYEEE
GENE
NATOR
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ee:
|).
SONS
|
apdusTMeENt
REMARKS
pee
easl)
adjust
so
there
is
no
difference
FM-IF ALIGNMENT.
High side thru. ; Connect vert. IC5 pins ®@ and @... 380 mV.
(1)| FM 0.001 .F to test — 10.7 MHz Point of non- amp. of scope to Adjust for maximum
point YW , Negative (SWP). | interference. (on/ | test point ©. T1 (FM 1st IFT) amplitude. @ LED METER ALIGNMENTS
side to test point Y . about 90 MHz) Negative side to (Refer to fig. 19).
test
point
YY.
ITEM
ADJUSTMENT
REMARKS
(2) VR303
Adjust for maximum
FM
t
"
”
T3
(FM
2nd
IFT)
amplitude.
Level
check
1.
Play
back
the
test
tape
(QZZCLA).
(Refer to fig. 20). 2. Adjust VR303 so that the 4th LED from the left begins to iltuminate.
[8] 9 (10