Panasonic RX-5500LS Serviceanleitung Seite 8

ALIGNMENTS
ALIGNMENT INSTRUCTION
READ CAREFULLY BERORE ATTEMPTING
5. Set tape/ radio/ sleep selector to radio.
1. Set volume control to maximum.
6. Set power source voltage to 12V DC.
2. Set balance control to center.
7. Output of signal generator should be no higher than
3. Set bass and treble control to center.
4. Set band switch to MW, LW, SW or FM.
LW, MW, AND SW ALIGNMENT
SIGNAL GENERATOR or
RADIO
SWEEP GENERATOR
BAND
FREQUENCY
CONNECTIONS
AM
Fashion loop of
455kHz
several turns of
Point
Mod.
wire and radiate
(1)
interference.
signal into loop of at 400 Hz
receiver.
LW-RF
(2) 145kHz
LW
(3)
285 kHz
LW
(132.0mm
(*1) Cement antenna bobbin with wax afetr completing alignment.
MW-RF
(4) 550kHz
MW
(15.8mm(5/8"))
(5) 1500kHz [132.0mm
MW
(*2) Cement antenna bobbin with wax after completing alignment.
SW-RF
5.9MHz
(6) SWI
[139.3mm
(7) 18MHz
SWI
FM IF & DETECTOR ALIGNMENT
EQUIPMENT REQUIRED
Signal generator that provides 10.7 MHz marker.
OSCILLOSCOPE
Set sweep selector of oscilloscope to "EXTERNAL SWEEP"
Apply 60Hzsweepsignalfrom sweepgeneratorto horizontalinput terminalsof oscilloscope.
I. Set band selector to FM.
2. Set volume control to maximum.
3. Set bass control to center.
RADIO
SWEEP SIGNAL
GENERATOR DIAL
GENERATOR
COUPLING SETTING
COUPLING
High side thru. Point of non-
High side thru.
0.001 F to interference
0.001 F to
point ICI (j)
point ICI (C) (on / about
90MHz)
Common to Common to
(2) Same as above. Same as above. Same as above.
RX-5500LS
Adjustment parts location is shown in Fig. 13 and Fig. 14.
ALIGNMENT
necessary to Obtain an output reading.
INDICATOR
DIAL (ELECTRONICS
REMARKS
ADJUSTMENT
VOLTMETER
SETTING
or SCOPE)
IF ALIGNMENT
Outout meter
Adjust
T3 (AM 1st 1ST)
of non-
across voice
T4 (AM 2nd IF T) output.
coil
ALIGNMENT
Adjust
L7 (LW OSC
Output meter
output.
coil)
145 kHz
across voice
(LW ANT moving
coil
coil) along ferrite core.
Adjust for maximum
CT6 (LW OSC
Trimmer) output.
285kHz
CT3 (LW ANT Repeat steps (2)
Trimmer) and (3).
ALIGNMENT
L8 (MW OSC Adjust
Output meter
coil) output.
550kHz
across voice
moving coil bobbin
coil
along ferrite core.
ANT coil)
CT7 (MW OSC Adjust
1500kHz
Trimmer) output.
Repeat Steps (4)
CT4 (MW ANT
Trimmer) and (5).
ALIGNMENT
L9 (SW OSC
Output meter
coil) Adjust
5.9MHz
across voice
L3 (SW ANT
output.
coil
coil)
CT8(SW OSC Adjust
18MHz
Trimmer)
output.
CT5 (SW ANT Repeat steps (6)
(5-112"))
Trimmer) and
Sweep generator that provides 10.7 MHz with 400kHz sweep width.
4. Set treble control to center.
5. Maintain line voltage at 12 volts DC.
6. Set balance control to center.
INDICATOR REMARKS
ADJUSTMENT
Adjust for maximum amplitude
and proper linearity.
Connect vert.
amp. of scope
Tl (FM 1st IF)
to JP29.
Common to
To obtain proper linearity.
T2(FM 2nd IF)
Same as above.
(Secondary)
RX-5500LS
FM RF ALIGNMENT
SIGNAL
SIGNAL
GENERATOR GENERATOR
COUPLING FREQUENCY
Connect to EXT FM
antenna terminal
87.5MHz
(3)
through FM dummy
(400Hz Mod.)
antenna.
Common to chassis.
90MHz
(4)
(400Hz Mod.)
106 MHz
(5)
(400Hz Mod.)
for maximum
SEPARATION ALIGNMENT
• EQUIPMENTS REQUIRES
I) Stereo modulator... ...Connect stereo modulator output to EX Mod. terminal of signal generator.
for maximum
..Modulator
2) Signal generator .
Adjust L2 by
Modulation
coil bobbin
Output level .
Frequency
3) Oscilloscope
4) Dummy antenna
5) Electronics voltmeter
6) Low pass filter (15kHz)
• MEASURING CONDITION
Band selector to FM, dial setting to approx. 98MHz, bass control to CENTER, treble control to CENTER, balance
for maximum
control to CENTER, volume control
Adjust L2 by
ALIGNMENT PROCEDURE
for maximum
SIGNAL
SOURCE
ITEM
CONNECTION
Adjustment of
90MHz, 60dB
pilot signal.
for maximum
Signal generator
for maximum
Dummy
antenna
37.50:
to FM antenna
RADIO
DIAL INDICATOR ADJUSTMENT
SETTING
Output meter
L5 (FM OSC
87.5MHz across EXT SP
jack (L).
L4 (FM DET
90 MHz
CT2 (FM OSC
trimmer)
106 MHz
CTI (FM DET
trimmer)
rate by left signal..
rate by left signal... .
..60dB
.Approx. 98 MHz
should be no higher than necessary to Obtain output reading.
EQUIPMENT
ADJUSTMENT SPECIFICATION
CONNECTION
...(+) side
VRI
19kHz
...(—) side
Oscilloscope
Stereo modulator
VTVM
'
Low ass filter (15kHz)
750
OUTPUT
INP T
1Kn 80
Jack board
o
terminal
EXT sp jack
Equipment connection for separation alignment
Fig. 12
REMARKS
Adjust for maximum
coil) output.
coil)
Adjust for maximum
output.
Repeat steps (3), (4) and
REMARKS
Set stereo (L + R)
modulation to zero.
80