Panasonic RF-542 User manual

$ | ? ? ORDER NO. 1D&7100270C2
Service
Manual
FM/AM
Portable
Radio
RF-
5
4
2
(WHITE) (Black)
This is the Service Manual for
the following areas.
[Z]. ..For all European areas
except United Kingdom,
F.R. Germany, France,
Italy and Finland.
[ZE] ...For United Kingdom.
[Z]] ...For Italy and Finland.
[ZG] ...ForF.R. Germany.
[ZY ] ...For Spain and
Greece.
Panasonic
B SPECIFICATIONS
Frequency
Range:
FM
87.5
~—
108MHz
Power
Requirement:
AC;
[Z}
[Zl]
[ZG]
[ZY]---220V,
50h
AM
520
~
1610kHz
(577
~
186m)
(Ze)
eer
240V,
SOH:
Intermediate
Frequency:
FM
10.7MHz
Battery;
6V
(Four
“AA”
Penlight
Batteries)
AM
455kHz
(470KHz:::{(ZE]
Only)
(Panasonic
UM-3
or
equivaient)
Sensitivity:
FM
4.0uV
for
50mW
Output
Power
Consumption:3W
(AC
only)
(—3dB
Limit,
Sens)
Speaker:
8cm
PM
Dynamic
Speaker
42
AM 159uV/m for 50mW Output Dimensions: 212(W) x 161(H) x 56(D)mm
Power Output: 720mW RMS. (Max) Weight: 610g Without Batteries
Impedance: Earphone/EXT SP Jack:::--:::: 8043.5
Design and specifications are subject to change without notice.
Matsushita Electric Trading to., Ltd.
PO. Box 288, Central Ogk.a Japan
Panasonic

LOCATION
OF
CONTROLS
AND
COMPONENTS
aa =
tt ania) °°
@ Speaker (8cm, 4°)
@ Tuning Control (TUNING)
©
On-
Off/Volume
Control
(VOLUME)
@
External
Speaker/Earphone
Jack
([>
¢)
IMP
8O
ONLY)
© Handle
@ Telescopic Antenna
@ Battery Compartment
© AC Socket
©
Band
Selector
(BAND)
DISASSEMBLY INSTRUCTIONS
Remove
the
Battery
Compartment
Cover
(Fig.
1)
HiRemove
the
Front
Cabinet
(Fig.
2)
1.Remove
the
Battery
Compartment
Cover
(A)x1
1.Remove
screws
(B)
(8x20)mmx
5
—____
|
|
_
|
BS
©
ee
Fig. 1

mRemove
the
PC.
Board
(Fig.
3)
1.Remove the Socket (C)x1
2.
Pull
out
the
PC
Board
with
a
driver
in
the
direction
of
arrow
(D)
as
shown
in
(Fig.
3)
3. Remove screws (E) (8x12)mm xX 3
Notes:
_
Set
the
variable
capacitor
to
minimum
position.
_
Turn
the
tuning
knob
clockwise
until
reaching
end
scale
position.
|
.
Before
inserting
the
radio
PWB
into
the
rear
cabinet
be
(C)
sure
to
insert
completely
the
variable
capacitor
shaft
into
the
tuning
knob
cabity.
(E
[Z]
-:-For
all
European
areas
except
[ZE]
[Z1]
[ZG]
[ZY]
[ZE]---For
United
Kingdom.
[Z|]
---For
Italy.
Fig.
3
[ZG]---For
F.
R.
Germany.
[ZY]:--For
Spain
and
Greece.
@ ALIGNMENT POINTS
°
Please
refer
to
Circuit
Boara
and
Wiring
Connection
Diagram
to
locate
the
test
points.
AM
ANT
(1628kHz---
Sar
ac
SEOks
|
(21)
(26)
Only)
LTA)
19
a
anH2
511kHz
(87.3MHz:---
(Z1}
(ZG)
Only)
(Z!) (ZG) Only)
| D | ~ (470kHz---
(ZE) Only)
FM 2nd
10.7MHz
AM ANT AM OSC
1500kHz 1650kHz
cra FM ANT.
106MHz
FM ANT
90MHz
AM
2nd
CT1 455kHz
FM OSC (470kHz:::
109.3MHz
(ZE}
Only)
(108.3MHz---
(ZI) (ZG) Only)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
MEASUREMENTS AND ADJUSTMENTS
@ ALIGNMENT INSTRUCTIONS
READ CAREFULLY BEFORE ATTEMPTING ALIGNMENT
Notes:
1. Set volume control to maximum.
2. Set band switch to AM or FM.
3. Set power source voltage to 6 volts DC.
4. Output of signal generator should be no higher than
necessary to obtain an output reading.
INDICATOR
ADJUSTMENT REMARKS
T3 (AM 1st IFT) ‘Adjust or
T4
(AM
2nd
IFT)
maximum
output.
SIGNAL GENERATOR or
SWEEP
GENERATOR
RADIO
DIAL
|
(ELECTRONICS
SETTING
VOLTMETER
or
(DISTANCE)
|
SCOPE)
AM-IF & RF ALIGNMENT
Point of non-
interference.
(on/about
600 kHz)
CONNECTIONS FREQUENCY
Fashion loop or 455kHz
Several turns of wire (470kHz:-:-
and radiate signal --[ZE] only)
into loop of receiver. 30% Mod
at 400Hz
511kHz Tuning
” (S14kHz ---- capacitor "
(Z!] [ZG] only) | fully closed.
1650 kHz Tuning
" (1628kHz-:-- capacitor i,
[Z1] [ZG] only) | fully open.
es Adjust for maximum
; *1)L1 (AM output. Adjust Ll by
" 550 kHz Tune to signal. ” ANT Coil) | moving coil bobbin
along ferrite core.
Adjust for maximum
” 1500 kHz Tune to signal. " oe aes output.
Repeat steps (2)~(5)
(*1) Cement antenna bobbin with wax after completing alignment.
. Connect vert.
Pea amp. of scope to Adjust for maximum
10.7 MHz | (on/about point 7 T1 (FM 1st IFT) | amplitude.
90 MHz) Negative side to (Refer to fig. 1).
; point WY
Adjust for maximum
” ” ” ” T2 (FM 2nd IFT) amplitude.
: (Refer to fig. 2).
Connect point W
Output meter
across
voice coil.
CT3 (AM OSC .
Trimmer)
High. side thru.
0.001uF to point
Negative side to
point Vv
86.2MHz
through FM dummy Tuning . 2
antenna
Negative
side
(87.3MHz
capacitor
Output
meter
_
L4
(FM
OSC
Goil)
(*2)
Adjust
for
maxi-
(ZI)
(ZG)-:-
fully
closcd.
across
voice
coil
mum
output.
Only)
109.3 MHz
(108.3MHz
(ZI (ZG)---
Tuning
capacitor
fully open.
CT1 (FM OSC
| Trimmer)
Adjust for maximum
output.
Repeat steps (8)~(11).
to point Vv
WwW
“1
Ww
Only) poe
(*2) Three output responses will be present; proper tuning is the center frequency.
CT2 (FM ANT
Trimmer)
Fig. 1 Fig. 2

RF-542 RF-542
SCHEMATIC DIAGRAM IC2_TA8100N
Bp Se ere Sg ae ae ate eee, eee, ae eee ee ee Sea, ea ae, Se eee ae ae ee ee er en 7
|
IC1 nol festa KF PO 7 .
RVITA7358P
022-7
a
a
FM
ANTENNA
oy
RZ
=
ae
pee
J3
5 -10V3
2SC829BNCTA | =| cag L8 | EARPHONE
7 dsedbaale | ny eee
| SPEAKER Notes:
| gcm(3”)4Q 1.S1-1~S1-2: Band switch in “FM” position
oe Gonnins FM, 3---- AM)
2.82: Power select switch in “DC” position
S200; ~ Power switch in “OFF” position
4.DC Voltage measurements are taken withan electronic
— BATTERY voltmeter based on negative terminal of Battery.
---FM position, ( ):--AM_ position.
5. Battery Current no signal--- 20mA
Maximum output -----:------225mA
6. VR1--- +--+ +--+ Volume Control.
7 ome (B) Voltage Line
meee FM Signal Line.
C18 M0.047
7
8.
The
mark
(W)
Shows
test
point.
e.g.
C3
JI5P
(
W
--Test
point
1
(J24P
|
C6
|
O
A
9.
Important
safety
notice
[Z1][ZG]
MO.001
C7
C9
K22P
0
=p
S
Components
identified
by
the
symbol
A
have
special
Only)
|
|
|
K20P
(k27P
aS
:
Sy
|
S+
J1
AC
IN
characteristics
important
for
safety.
|
|
(K24P
=
[ZI
[ZG]
680
~
rite
=
220V50Hz
When
replacing
any
of
these
components,
use
only
|
|
[ZI][ZG]
Only)
IB
i
=k
=
(ZI[ZI[ZG]
On!
manufacturer's
specified
parts.
|
|
Only)
|
/
T3
7
|
nly
Peeps
os
ie
Ser
ce
She
eyes
eee
ds
|
(240V50Hz
Fc
ee
i
a
et
ee
E
;
iE]
Only)
™
REPLACEMENT
PARTS
LIST
(T) Indicates parts that are supplied by TAMACO.
IC2 D1,2 Important safety notice
TA8IO0N
RVDIN4002
|
Components
identified
by
the
symbol
A
have
special
char-
, actristics important for safety.
FM IF/AM RF IF/POWER AMP RECT When replacing any of these components, use only
manufacturer’s specified parts.
[Z]
---For
all
European
areas
except
[ZE]
[Z!]
[ZG]
[ZY]
iad
RESISTORS
&
CAPACITORS
PARTS
LIST
:
:
!
,
Ref.
No.
Part
No.
Part
Name
&
Description
[ZE]---For United Kingdom.
[Zl] ---For Italy. INTEGRATED CIRCUIT; TRANSISTOR AND DIODES
IC1 RVITA7358P LS:
Numbering
System
of
Resistor
Numbering
System
of
Capacitor
IZG]:-For
F.
R.
Germany.
i
UE
oS
Example:
Example:
[ZY]
-«-For
Spain
and
Greece.
Q1
2SC829-B
Transistor
ERD 25 F J 101 ECKD 1H 102 Z F . D1,D2(T) RVD1N4002 Diode
Type
Wattage
Shape
Tolerance
Value
Type
Voltage
Value
Tolerance
_Peculiarity
eres
peices
AM
(1009)
(1000
pF)
'
Ref.
N
Part
N
l
i
silo vin arene: RLO2B113 Oscillator Coil AM
_ERJ
_
66
ae
HC
a
ae
__2R2
ECEA
50
M
R47
RESISTORS
ECCD1H220KC
RLO4Y19
Antenna
Coil
FM
Type
_-
Wattage
Shape
_‘
Tolerance
Value
Type
Voltage
Peculiarity
Value
ERDS2TJ560
ECCD1H270KC
RLO4Y70
Oscillator
Coil
FM
(2.2) (0.47 pF) : ERDS2TJ101 ECFD1C223MD
ERDS2TJ220 _ ECFD1C103MD
ERDS2TJ331 ECEA1AS221
ERDS2TJ472 ; RCBS1H681KB
ERDS2TJ680 RCBSOJ153MY
ERDS2TJ392 18, ECFD1C473MD
ERDS2TJ473 RCBS1C103MY
ERDS2TJ470 ECEA1CS100
ERDS2TJ273
L4(ZI)(ZG) RLO4N148 Oscillator Coil FM
L5(ZN (ZG) RLQY10S3 Choke Coil
RLQY50S5 Choke Coil
RLQZB100K Choke Coil
RLI4B153 © |. F. Transformer FM
RLI4B158 . F. Transformer FM
RLI2B465 |. F. Transformer AM
RLI2B215 |. F. Transformer AM
RLT5I2G4A Power Transformer A
>: +10%
: +20%
< ae
: +5%
: +2%
: +1%
: +0.25pF
: +0.5pF
: t1pF
: Carbon Resistor
Solid Resistor
Incombustible
Box-Shaped
Wire-Wound
Resistor
: Metal Oxide-Film
Ceramic Capacitor (ECCD, ECKD Type)
(Chitacon) 1H : 50V 0C 2H
Ceramic Capacitor (ECFD Type)
(Chitabari) C :12V0C D
Semiconductor : 50V DC
Ceramic Capacitor
Electrolytic Capacitor
Tantalum Fixed
Electrolytic Capacitor
ECEAOJS471
ERDS2TJ102 ECEA1AS331
ERDS2TJ681 ECEA1AS471
ECEA1AS102
CAPACITOR ECKD1H223ZF
ECCD1H470KC ECCD1HO30CC
ECCD1HO50CC ECEAOJS 221
RCBS1H150JC
C3(Z1) (ZG) RCBS1H240JL
RCBS1H102KB
ECKD1H102MD
ECCD1H200KC
C7(ZI) (ZG) ECCD1H240KT
C8 ECCD1H120KC
(Z) (21) (ZG)
T5(T)(ZE) RLTS5I2ZA2A Power Transformer A
VARIABLE RESISTOR
VR1(T) RVV5C6A14 V. R. Volume (With Power
in V. R. $3)
VARIABLE CAPACITOR
VC1-4 RCV4LC2V1K —=_ Tuning Capacitor, W/Trimmer
Capacitor (CT1~ 4)
CERAMIC FILTER
RVFSFE107MAZ Ceramic Filter
SWITCHES
Resistor
: Wire-Wound
Resistor
: Superstable
Metal Film
Resistor
Metal-Film
Resistor
Chip Resistor
NOONHO N Sx
Polystyrenc Film : 10V
Capacitor : 25V
Polystyrene Film : SOV
Capacitor : 100V
Polypropylene Film
Capacitor —
T.F Capacitor
RSS139 Switch, Band
SPEAKER
Chip Capacitor
Cylindrical Ceramic
x Capacity are in microfarads (iF) unless specified Capacitor
SP 1(T) EAS8P307TZ — Speaker
otherwise,
P=Pico-farads.
JACK
%
Resistance
are
in
ohms
(Q),
unless
specified
J1(T)
RJJIA4Y
Jack,
AC
IN
(With
Battery
otherwise,
1K=1,000Q,
1M=1,000KQ
(Z)
(20
(ZG)
in
Jack
$2)
A
;
J1(T)(ZE)
RJJ1A5Z
Jack,
AG
IN
(With
Battery
in
Jack
S2)
A
.
.
J2
RJP3G1TZ
3P
Plug
5
|
6
J3
RJJD3M6Z
Jack,
Headphones

CIRCUIT
BOARD
AND
WIRING
CONNECTION
DIAGRAM
|
|
|
|
|
|
BAT
TERY
|
er
|
|
|
|
|
|
|
|
| [ZI [ZG] Only
Da ai es, ee ce eet: Ga el eee
PM
DYNAMIC
:
:
>
meal
:
ie
[Z]
-:-For
all
European
areas
except
SPEAKER
Ne
|
5
a:.4
|
[
ZE}
[Zl]
[ZG]
[ZY]
[ZE]---For United Kingdom.
[Z|] ---For Italy.
[ZG]---For F. R. Germany.
[ZY]---For Spain and Greece.
CAUTION
RISK OF ELECTRIC SHOCK
AC voitage line. Pleasedo not
touch this portion.
Anode
Cathode
Cao—4q--—0 A
D1,2

i
!
CABINET AND ELECTRICAL PARTS LOCATION
Panasonic
[Z] ---For all European areas except
M REPLACEMENT PARTS LIST [ZE] [Zl] [ZG] [ZY] |
(T) Indicates parts that are supplied by TAMACO. [ZE]---For United Kingdom. NOTES:
Important safety notice 7 (BK) .... Black
Components identified by the symbol A have special char- [21] For Italy. (WT) .... White
actristics important for safety. [ZG]---For F. R. Germany.
When replacing any of these components, use only [ZY]---For Spain and Greece.
manufacturer's specified parts.
CABINET PARTS F2(T) RBT238TZ8 Knob, Tuning (WT)
K1(T)(Z)(ZE) RYMF542ZKT Front Cabinet Ass’y (BK) JE3(T) RBT239TZ Knob, Volume (BK)
K1(T)(Z)(ZE) RYMF542ZKT8 Front Cabinet Ass’y (WT) JE3(T) RBT239TZ8 Knob, Volume (WT)
K1(T)(ZI) (ZG) RYMF542ZiIKT Front Cabinet Ass’y (BK) |E4(T) RJT235TZ Terminal
K1(T)(Z1) (ZG) RYMF542ZIKT8& Front Cabinet Ass’y (WT) [E5(T) RJC263TZ Battery Terminal (+)
K2(T)(Z) RYFF542ZKT Rear Cabinet Ass'y (BK) |E6(T) RJC264TZ Battery Terminal (—)
K2(T)(Z) RYFF542ZKT8 Rear Cabinet Ass’y (WT) [E7(T) M17+4 Screw
K2(T)(ZE) RYFF542ZEKT Rear Cabinet Ass’y (BK) |E8 XYN3 +F8FN Screw
K2(T)(ZE) RYFF542ZEKT8 Rear Cabinet Ass’y (WT) |E9 XSN26+5 Screw
K2(T)(Z0) RYFF542ZIKT Rear Cabinet Ass’y (BK) |E10 XTV3+12C Screw
K2(T)(Z0) RYFF542ZIKT8 Rear Cabinet Ass’y (WT)
XWA26B Washer
K2(T)(ZG) RYFFS42ZGKT Rear Cabinet Ass’'y (BK) [E12(T) QEFO75TY Souce Wire Ass’y
K2(T)(ZG) RYFF542ZGKTS8 Rear Cabinet Ass’y (WT) [E13 RMC163 Shield Cover
K3(T) RYNF542XKT ~—— Battery Cover Ass’y (BK) ACCESSORIES
K3(T) _ RYNF542ZKT8 Battery Cover Ass’y (WT) JA1(Z) (ZI) (ZG) RJA20Z Power Cord, AC A
K4(T) RJC262TZ Battery Terminal (+&—) [A1(ZE) RJA86Z Power Cord, AC &
K5(T) RMS202TZ Spring A2(T) RQX578TZ Instruction Manual
K6(T) RKH211TZ Handle (BK)
K6(T) RKH211TZ8 Handle (WT)
XTN3 + 20C Screw
PACKING MATERIALS.
P1(T) RPK388TZ Carton Box
P2(T) RPP264TZ Polyethylene Cover
P3(T) RPNA1033TZ = Polylon
ELECTRICAL PARTS
E1(T) XEARK162DAY Telescopic Antenna
RBT238TZ Knob, Tuning (BK)
TD[ZI/[ZEV{ZW/ZG)/[ZY] T.Y
Printed in Taiwan