Panasonic RX-F20L Service Manual Seite 14
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RX-F20L
MEASUREMENTS AND ADJUSTMENTS
@ ALIGNMENT INSTRUCTION
READ CAREFULLY BEFORE ATTEMPTING ALIGNMENT
. Set volume control to maximum.
. Set tone control to treble.
. Set band switch to LW, MW, SW or FM.
. Set balance control to center.
. Set function selector to radio.
6. Set fine tuning to center.
7. Set power source voltage to 9V DC.
8. Output of signal generator should be no higher than
necessary to obtain an output reading.
oOhwWND—
m LW, MW, and SW ALIGNMENT
SiO GENERATOR" | napio oa. | ELECTRONS |
ENERATOR
BAND
SETTING
VOLTMETER
| ADJUSTMENT
REMARKS
CONNECTIONS
FREQUENCY
or SCOPE)
|
|
AM-IF ALIGNMENT
| Fashion loop a
:
é
;
-
if
:
-—
several turns o
455
kHz
oint of non-
utput meter
|
:
:
(1)|
AM | wire and radiate
30% Mod. | interference. (on/| across voice
TOME,
" | alee Richinesiaym
signal into loop of
at 400 Hz.
about 600kHz).
| coil.
|
put.
| receiver.
|
|
LW-RF ALIGNMENT
T
T
T
Fi
gee a
act
eee,
= T
L7 (LW OSC
Adjust for maximum
|
Output meter
|
.
H
"
145 kHz
:
Coil)
output. Adjust L4 by
(2);
LW
145 kHz
[9.5mme/,")]_
| Bross voice
| (#1) L4 (LW
moving coil bobbin
.
|
ANT Coil)
along
ferrite core.
|
apeun
| CTS i A sean
Adjust for maximum
i
Zz
"
rimmer
output.
(3)
iw
285kHZ
| 1g0.69mm(33/;,')]
| CT3 uw ANT
| Repeat steps (2)
Al
L
|
Trimmer)
and (3).
MW-RF-ALIGNMENT
7
ave
| L8 (MW OSC
Adjust for maximum
Output meter
J
:
i
550kHz
:
Coil)
output. Adjust L5 by
Oy)
MS
|
mobikhlz
[aSmmey-
| actos voice
| (1) LS (MW
moving coil bobbin
L
:
ANT Coil)
along
ferrite core.
ect
| CT IMW OSC | Adjust for maximum
7
;
z
"
rimmer
output.
(5)| MW
1,500kHZ | [g0.69mm(32/¢°)]
CT4 (MW ANT | Repeat steps (4)
|
rimmer)
and (5).
1
Ear DUO
(* 1) Cement antenna bobbin with wax after completing alignment.
[
SW-RF ALIGNMENT
| L9 (SW OSC
Output meter
H
.
F
5.9MHz
:
|
Coil
Adjust for maximum
y/o
DOI
theca
agMel2
scemmenal || corse vole
L6 (SW ANT
output.
|
eamic capacitor
:
|
Coil)
|
:
10pF).
:
Adjust for maximum — |
|
sw_
| Negative side
Rein
18MHz
CT8 (SW ANT | output.
to test pointy.
[85.34 mm(3#4/3,")]
Trimmer)
Repeat steps (6)
|
|
and (7).
= FM ALIGNMENT
SWEEP GENERATOR ©
| RADIO DIAL
(ELECTRONICS |
WEEP GENERATOR
BAND
SETTING
VOLTMETER
| ADJUSTMENT
REMARKS
CONNECTIONS
FREQUENCY
or SCOPE)
j
FM-IF ALIGNMENT
Connect to test
Connect vert.
poiney through
10.7MHz
Point of non-
amp. of scope to
Adjust for maximum
(1)
FM
0.001
u F .
:
interference. (on/|
test point Y.
T1 (FM 1st IFT) | amplitude.
:
:
(SWP.)
:
Negative side to
:
about 90MHz).
Negative side to
(Refer to fig. 13.)
test point.
test point WY
Adjust for maximum
(2)
FM
T3 (FM 2nd IFT) | amplitude.
(Refer to fig. 14.)
FM-RF ALIGNMENT
|
L3 (FM OSC
Output meter
;
'
Connect to test
SOMHz
Coil
Adjust for maximum
By
OM
ee oint Sy through
valde
[11.03mm(/,,") | 267088 voice
L2 (FM NT,
output.
FM dummy
;
Oi
ener ba: Tegan?
CT2 (FM OSC
(* 2) Adjust for maxi-
(4)
EM
p
106MHz
106MHz
Trimmer)
mum output.
Ww.
[75.81 mm(231/,.')]
CT1 a see
a
steps (3) |
rimmer
and
(4
[ (* 2) Three output responses will be present; proper tuning is the center frequency.
VG a4) &
a SEPARATION ALIGNMENT
| —_
cM SIGNAL
|
EQUIPMENT
[To
[|
|
|
ENERATOR
CONNECTION
PEN
tart
Ba diunanedon
ITEM
BCURGE
SECHRONIO
ADJUSTMENT
| SPECIFICATION
REMARKS
CONNECTION
|
COUNTER
Adjustment of | 98MHz,60dB.
| W...(+)
Adjust VRi, for 19kHz
:
:
Su
VR
i9kKHz
(+0.1kHz) reading on
| pilot signal.
| (Mod CW)
Soa gee ) ee.
ff
electronics counter. _
m@ AUDIO ADJUSTMENT
ITEM
—
INPUT
MEAOINT
"SPECIFIC [hon sae
|
REMARKS
Azimuth
(kHz, ~20dB)
EXTSP
Magiinium ouipui. | Azimuth sorew.
| Playback mode.
Bias
;
W.. (+)
Record mode
|
oscillation
_——
wi)
/0+0.5KHAZ
L301
Beat proof switch > |
Frequency.
|
Tape selector > Metal
UES UG
eae) Ore
eee
*cawBieeden
Seales S e e
the 2
stds) (OPE ee ene
oC taD
4 Len (+)
iVieial.. YEO
10GRA |
AeeardiGiede
Bias current
Use metai iape 2g aa i
Ste
ade SULA | vRigs
Beat proof switch > |
ee
eT
x ise
a
Tape selector > Metal |
@ ALIGNMENT POINTS
FM ANT
MWANT MW ANT
LW ANT
9OMHz
S550kHz
I500kHz
145kHz
9
rts]
[cra]
TL |
_———
i
a
W
CO)
4
a
G
FM ANT LW ANT
SW ANT MW OSC
BIAS
FM ist
IO6MHz
285kHz
5.9MHz 550kHz
CURRENT
pelle
VRIOS
FM OSC
IO6MHz
[99.900]
cT2
aR5
10144201
W
LW Osc
MW
OSC
/SW ANT
285kHz
ISOOkHz
/ 18MHz
(Fig. 12]
[Fig. 13]
[Fig. 14]
RX-F20L
