Panasonic RX-5120LS Service Seite 5

RADIO CIRCUIT
RST
CTS
C25
C22
cza
R33 Rd5 _ =
vc53
IC3
FM STEREO POSITION
5.sv,äi 2.6V g 2.6v 1.3v/
20.77V 1.3V\14' l¯.évi
1 1.31/
i 4, 2.6vi8, 0.21/!12 c.iVM6i2.68v;
BOARD
;3.42V
2
9
3
Titch
4.41 Vi
7 '3.49
Rs
ctf
•Cfi
23
C2T.T3
0.46v
CF2'
R27
+ C29
-t R29
R25
CmA
RZE
23
.02
IC2
FM
AM
AM.
AM 0.6V
0.7 V
FM
AM 0.75V c.7Vi
, FM OV
AM 5.16V AM s.l€v
3.3 v
; AM'.17V. -6170
RX.5120LS
ALIGNMENT INSTRUCTION
READ CAREFULLY BEFORE ATTEMPTING ALIGNMENT
1. Set volume control to maximum,
2. Set tone control to center.
3. Set band switch to MW, LW, SW or FM.
• LW, MW, AND SW ALIGNMENT
SIGNAL GENERATOR
SWEEP GENERATOR
BAND
CONNECTIONS
FREQUENCY
Fashion loop of
i5V
several turns of
(1)
wire and radiate
signal into loop of
receiver.
V
(2) LW
(3) LW
1)Cement a ntenna bobbinwithwaxaftercompleting alignment.
(4)
(5)
1,500 MHz
*2) Cementantennabobinwith wax after completingalignment.
(6) SW Connect to EXT
ant. terminal
through ceramic
capacitor (10 PF),
Negative side
(7) SW
!
to earth.
FM ALIGNMENT
SIGNAL GENERATOR or
SWEEP GENERATOR
BAND
CONNECTIONS FREQUENCY
Connect to test
point
through
(1) FM
10.7 MHz
O.OOI„F. Negative
side to earth.
(2) FM
Connect to test
pointV through
(3) FM
FM dummy 87.5 MHz
antenna. (Refer to
fig. 14.)
(4)
90MHz
(5)
106 MHz
(*3) Threeoutput responses will be present; proper tuning is the center frequency.
ALIGNMENTS
4, Set tape/radio/sleep selector to radio.
5. Set power source voltage to 12V DC.
6. Outputof signal generatorshouldbe no higherthan
necessary to obtain an output reading.
or INDICATOR
RADIO DIAL (ELECTRONICS
ADJUSTMENT
SETTING
VOLTMETER
or SCOPE)
AM IF ALIGNMENT
455 kHz
Output meter
Point of non- T3 (AM 1st IFT)
Mod.
across voice
interference. T4 (AM 2nd IFT)
at 400 Hz coil
LW-RF ALIGNMENT
L7 (LW OSC
Output meter
145 kHz
145 kHz
across voice
[11.2mm
coil
CT6 (LW OSC
285 kHz
Trimmer)
285 kHz
[136 mm
CT4 (LW ANT
(617/32
Trimmer)
MW-RF ALIGNMENT
1.8 (MW OSC
Output meter
550 kHz
550 kHz
across voice
(12.9 mm PIZ"))
(*2) 12 (MW
coil
ANT coil)
CT7 (MW OSC
1,500 kHz
Trimmer)
[171.1 mm
CT3 (MW ANT
(6ZJ/32 M))
Trimmer)
SW-RF ALIGNMENT
L9 (SW OSC
Output meter
6 MHz
6 MHz
across voice
[8 mm (s/16")] L3 (SW ANT
coil
CT8 (SW OSC
18 MHz
trimmer)
18 MHz [188 mm
CT5 (SW ANT
(712/32
Trimmer)
RADIO DIAL
INDICATOR
ADJUSTMENT
SETTING
(VTVM or SCOPE)
Connect vert. amp.
Point Of non-
of scope to test point Tl (FM FT)
interference.
Negative side
(primary)
to test point
T2 (FM FT)
(Secondary)
FM-RF ALIGNMENT
Variable
Output meter
capacitor
L5 (FM OSC coil)
across voice coil.
fully closed.
90 MHz
[26.Imm (11/32"))
TUNE coil)
CT2 (FM OSC
106 MHz
Trimmer)
[168mm
CTI (FM TUNE
Trimmer)
RX-5120LS
REMARKS
Adjust for maximum
output.
Adjust for maximum
coil) output. Adjust L2 by
moving coil bobbin
coil)
along ferrite core.
Adjust for maximum
output.
Repeat steps (2)
and (3).
Adjust for maximum
coil) output. Adjust L2 by
moving COII bobbin
along ferrite core.
Adjust for maximum
output.
Repeat steps (4)
and (5).
coil) Adjust for maximum
output.
coil)
Adjust for maximum
output.
Repeat steps (6)
and (7).
REMARKS
Adjust for maximimum
amplitude.
(Refer to fig. 12.)
Adjust for maximum
amplitude.
(Referto fig. 13.)
(*3) Adjust for maxi-
mum output,
(*3) Adjust for maxi-
mum output.
*3) Adjust for maxi-
mum output.
Repeat steps.