Matsushita Electric NATIONAL PANASONIC R-238W User manual

\,____
NATIONAL
anua
•
erv1ce
RAD ID
PANASONIC
"
AM 2-BAND PORTABLE RADIO
MODEL R-238W / R·238R
• SPECIFICATIONS
• SERVICING PROCEDURES
(Printed resistor circ uit )
1. When repairing the chassis .conn ect DC pow er source (4.5V)
to E
XT power jack and speaker to earphone jack too.
2. Th is is a high rel iability pr int ed resistor board.
Spec
ia l care should be exercised when using this resistor
board to
ass ure that the va l ues of the resistors are adequate.
and will
not be damaged w he n used in the circuit.
A) Operation notes:
1. Don't f le x the printed board exc ess ive, ly.
2. Be careful not to damage the printed resistors (black).
conductive paint or feed-through eyel.ets.
3. Avoid applying unnecessary amounts of heat to the
printed resistors. conductive paint or especially to the
f
P.e d-through eyelets.
B) How to check the resistance values
of the p ri nted re -
sistors:
Cut the printed
conductor of the reverse side of the printed
re sistor required to be checked so that the resistor will be
completely isolated.
Then. check the resistance value in the normal manner.
C)
How to replace a printed resistor:
When a printed resistor becomes faulty,
cut out that re-
sistor portion and solder a normal resistor to the printed
conductor on the back of the circuit.
Frequency Hange:
MW 525,....,1605 kHz (571,....,187 m)
SW 3.9,....,12.0
MHz (76. 9,....,25 m) W
Intermediate Frequency: 4.75,....,18.0
MHz (63.2,....,16.7 m): ·R
455 kHz
Se nsitivity:
Po w er Ou tput:
Batteries:
Speaker:
Dimensions:
Weight:
Impedance:
MW 50µV /m for 50 mW Output
SW 7 µV for 50 mW Output
700 mW Max imum
4.5V (Three
"D" Size Fl ashlight Bat-
teries)
(NA TIONAL UM-1 or equivalent)
8 cm (
3") PM Dynamic Speaker
203(Wide) x 132(High) x 45(D eep) mm
(
8"x5K'x 1%")
700 g. (1 lb. 8. 7 oz.)
Speaker ........... . ........
.... 8.n
Ea rphone Jack .... ... .......... 8.n
• TO REMOVE CHASSIS
1. Remove a tuning control knob from cabinet.
2. Remove a cabinet back cover screw.
3. Remove a red chassis screw as i l.l ustrated in fig. 1.
4. To rem ove chassis completel y, unsolder t wo l ea dwires to the
printed circuit board.
5. To reassemble. reverse the above procedure.
Note:
When removing the chassis. keep to push the part
of @ direction
of the arrow mark and pull out the part of @direction of the
arrow mark. (
Fi g. 2 & Fig. 3)
®
F
·-· -El 19. 1
@
Fig. 3
· MATSUSHITA
ELECTRIC
II
.-:;,
ORDER NO. RD-890
MATSUSHITA ELECTRIC TRADING CO., LTD .
P. 0. Box 288, Central Osaka. Japan

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Schematic Diagram~ Model R-238W/R-238R
I
I
I
I
I
I
I
I
I
TR 1
2SC829
RF AMP
I ya:
/Sj_ Cf
-"
N
N
Q!
TR 2
2SC829
CONV
01 TR 3
TR < 0 2
1Kl10 2SC828"
2SC829
1Kl10
D.AGC I
sl IF AMP
2nd IF AMP
DET & AGC
I I
I I
L--------- -- - -- - ~ ----- ~ z
c 7 I
R'
2
s
8 3 10
3312 I/
/j/4 J'i/6
20
21
4 2
.s 6 n .jt/.
3 5 7 'I 10
II
12 13
4 30 6
Notes:
1. S 1~S6 : Band se lector sw it ch in " MW" position.
2. S
7: Power so ur ce sw itch in "OFF" position.
3.
Sa: Tone sw it ch in "HIGH" position.
4. Sg: Light sw itch in "ON" positio n.
5. DC volt age measurements are t ake with circ uit t es ter 1 Okn/V from positive
terminal of battery.
6. R es istors are shown by* mark and printed re sistance h as no* ma rk .
7. The currents of TR10 and TR11 s how no signal in the radi o.
TR ,
2SC945
Isl AF AMF
llNT CO IL
22 23
25
3)
24- 32
TR o
2SC945
2nd AF AMP
I H1 u& 1 1 ~ 11
2SC945
INDICA TOR
TR 1
2SC945
3rd AF AMP
SW
s, Sz
MW
S3
~~~6~5
QAB~S~S
Cl4
Ss S&
TR s & TRo
288324
POWER AMP
BOTTOM VIEW
36 28
3031
37
27
29
CJ
SP g.n_
1~ 8on<;'l")
T 1. 2. 3
L3 .4
3004
20
I 0 0 6
14
17 18 !'I 21
20
24
25
2J 2B
29
IS
;c
22 SI 26
- Pos1 l 1v c Voltage L in c - Neqa1 ··<' \:)IJ,1;1,.

~
::0
'
N
w
~
,
::0
;..,
w
co
::0
IVH IP
ANTE NNA
Circuit Board Wiring View- Model R-238W/R-238R
L1
MWAN TEN NA COIL
TR I
le
EXT I
AN T ENNA
JAC k
TR&
1R1
T i< L L1
TR 2
c - 0.
83 V
8 -3. 3V
E - 3.
9V
l e 0.
5mA
EJ\T PO WER J/\Ck
TU N ING GAN 6
W/ JR IMME R
c
B
l o
0 - 4 . 5 V
8 · O: 14 V
E ov
~
BATTERY 4.5V
TR I I
c
B
- 4. 5V E
l e I 0 .2m A
le
TR 10
- 4 . 5 V
Om A
31 2
Sa T O\IE SW ITCH
EAR PHO N OR
EX T SPE Al<E R
JACk
~ -- --<1/ 1/ r-------- - -------'
TRi
Ls L2 l 4 L3
-Printed Re sistor Conductive Paint
TR 7
c
-0 . 93V
B -
3.25V
E -
3.9 V
le
2.2 mA
Printed Conductor

j
.
_j
N
_j
:i
0
0
:::J
"O
c
0
u
"O
Q)
c
· .:::
()_
+-'
c
ro
()_
Q)
>
· ~
:::J
"O
c
0
u
I
R-238W /R-238R
• DIAL CORD INSTALLATION GUIDE
1. Dial co rd leng·h is 10 0 cm (39 %").
2. Turn dial d U"i ·o le ft fully.
3. Arrows
(1 ~ 8) indi ca te correct order and direction of installation dial cord.
4. Ce me n di& ~ ·d end s.
5.. Turn dial ~- -· -,g gang to right fully.
6. Insert he ;::~_~ ~ o . th e dial tuning gang.
•TO MOU T DIAL POINTER
1. Tu rn d· c. :.-_- :: ··ght fully.
2. Se t die : : -:=· :: 5 ~ ar t mark of the d ia l ;:: :.:.·:..
3. Attach :. :o : : ·: :: di al pointer.
• ALIGN ME
STRUCTIONS
Notes:
1. Set vo lurr:o::--: · :- axi mum.
2. Set to ne_ _
3. Set ba n ds===·:· =- ::- :o MW or SW.
4. Set po er s:_·:= : ·=;=to 4.5 volts D C.
5. Output ofs · g-= :=-==·: ·sh ould be no hi ghe·:-= --=== ss ary to obtain
an output ·2=:. -;:
SW AN-
3-2 MHz
CL:;:
SW OSC
12MHz
§]
:_,9~
? £?'?]
MW 1st
455kH7_ -;::;:-
~ E.
MW 2nd
455k Hz -- -
~ 1-":: ~ '3 1
~5~ ~~~ _-: 2
B
MODEL
::
-238W
L
:SA OSC
~ :vH z
~
SWAN T
4.8MHz
cg
0 Pulley
SWA T
18. 0UH z
@;:
MW ANT
1500 kH z
[§]
MWOSC
MW ANT
550kHz
cg
550kH z ~----"
~~
SWOSC'
4.8MHz
cg
MODEL R-238R
R-238W/R-238R

ti TO REMOVE THE SPEAKER
1. Remove the ch ass is from the cabinet.
2. Remove the to ne sw itch.
3. Then remove the speaker.
• CABINET PARTS LOCATIONS
CA3
• PACKING PARTS LOCATIONS
P2
p4
•CAUTION
Do not push dow n the termi na l s. bec au se bad conn ec tions
w ill be happen. (Fig. 4)
RJT378A l
~ Donotpush
L Fig.4
• CHASSIS PARTS LOCATIONS
C Hg
CH 2
CH
a
CH 3
CH1 CH4 CH 1
CH1s
I~~ I -- -~~~······ . -..
··1rf
c~--~-•-C..=~--'.. >,fl
CH6
•ACCESSORY
R-238W /R-238R

•REPLACEME NT PARTS LIST
NOTES: 1. Par t numb ers are indicat ed on most me c ha nical pa rts. Ref.No.
Part No. Description Per
Se t Remarks
(P cs. )
Pl ease u se this pa rt num be r for pa rt s or de rs.
C22 ECAG1 6ER1-Y
O. lµ F, 16WV, E lectrolytic 1 y
2. ® in dic at es th e N ew Parts.
C25
ECAGI 6ER22-Y
0. 2 2µ F -, 16WV, Elec tr olytic 1 y
3.X - Z rank: X rank parts wi
ll c ov er 80% of repair needs. C
28.33 , 36.37
ECEA6V33 33 µF , 6.3WV.
El ectrolytic 4 y
X+ Y r an k par ts will cover 95% of repair need s.
C29 ECEA6V 470 4 70µF,
6.3W V, E !ec t roly t ic
1_
y
Z rank pa r ts are less necessar y.
Cl 3 ECEA 25V4R7 4
.7µ F,
25WV, El ectrolytic 1 y
C23 E
CEA5 0V1 I µF,
5 0W V, Elec tr olytic 1 y
C24 E CEA6V 4 70
4 70µ F,
6.3WV, Electrolyt ic ··R- 238R
]. y
Per S et C24 EC
EA 6 Vl 000 1OOO
µF , 6.3W V, Elec tr olytic··· R-23 8W
1 y
Re f.N o. Part No. Description (Pcs. Reirar-s 1
TRANS I STORS
AND
DIODES
TR1,2,3,4 2SC8 29
1st RF Amplifier, Converter 4 x
1st & 2nd IF Amplifier
VARIABLE
CAPACITOR
TR5 .6, 7,10, 11 2SC9 45
1st. 2nd & 3r d AF Amplifier 5 x
I nd1cator Amplifier
Cl. 2 PVC2K 20 TM
T uning Gang, W/ Tr immer ( C3,4, 5,6) 1 x
TR8 ,9 •2SB324
Powe r Amplifier 2 x
Dl,2
OA90 0 . AGC , Detector & A
GC
2 x
COMPONENT
COMBINATION
THERMISTORS
I'.' I EXAF
203Z 4 71 R 0.01µF X 2, 470!1 1 y
Th! · RRT 1 71
Tempe ra ture Compensator 1 x I
SWITCHES
Th2 RR Tl 03 Temperature Compensator 1 x
Va EYV3 20DI R2J2
Opera t ion Compensator 1 x
Sl -6
RSS70A Band Selector Switch
1 ® X
RSS43 -1 Tone Switch 1 x
COILS AND
TRANSFORMERS
I
SPEAKER
L 1.2 R LF 5F 56- 0 MW &
SW Antenna Coil(M ode l R-238R) 1
~
x
L 1,2
RLF5 F 58 -0 MW &
SW Antenna Coil(Model R-238W) 1
~
x " EA
S8P70S C
Som (3") PM Dy na mic S pea k e~. I mp. 8!l
1
<SJ x
L3 RL 02 B 86- M MW Oscillator Coil
1 x
L4
RL03B61 -M SW Oscillator Coil (Model R-238R) 1
~
x
CHASSIS
L4 RL 03B66 -M
SW Oscillator Coil (Model R-238W) 1 x
L5
RLQY75S -5 Choke Coil (Mo
del R-238R) 1 y XAM21 T
50 light. Di a! & Tuning Indicator 2 x
T1
R L/2 8 124-M
1st IF Transformer 1 x C- 1
RJCl 02-1 T
erm i nal, Battery EE, Side 3 z
T2
R L/ 28250 -M 2nd
IF Transformer I x c 2 RJC502A Spr
ing, Battery8 S ide
3 @ z
T3 RLl2B450-M 3rd IF Transformer 1 x C- 3
RJ J 19A Jack, Earphone 1 y
T4 RL
T3F33-W
Input Transformer, P = 1 .4k0: S-1.4 k0 I x C
i-..;.
RJJ49A Jack, EX T. Power 1 y
T5 RLT2F32 -W
Output Transformer. P =- 60!1 : s~so
I x RJT377A
Termi nal, Light Button 1 ® Y
-
RJT30 5A Ter mina l, l ight Button 1 y
RESISTORS
c ~;;
RJT378A Terminal, Conecti on
6 @ Y
C- 6 RMS30 8 racket, Speak
er M ' tg
1 z
R29
ERDl 4VJ2R2 2.2!l .
Y.l' Watt. ± 5%.
Carbon 1 y C- 7
RMY54 -I
Heat Smk, Tr a ns istor ( TR8 & TR9) 1 z
R26
ERDI 4VJ101 IOO!l ,
J..i Watt, ±5% , C ar bon
1 y c- RB T3 5B Knob , Volume 1 x
R30
ERDl 4VJ471
4700,
){ Watt,
± 5 %, Carbon ··· R- 238R 1 y
RDZ05A Cord, Di a l. I OO cm( 39 Ys ") 1 z
R5
ERD14VJ l2 2 1.
2k!l , ){ Watt, ± 5
%, C ar bon ··· R-238R 1 y RDD4 81A
Drum. Dial 1 @ x
R5
ERD14V J821
8200, }:j' Watt, ± 5
%, Carbon ··· R-238W I y
RDS30 9 Sp r ing, Di al
2 y
Rl ERD1 4VJ564 56
0k !l, Y. Watt, ± 5 %. C ar bon
1 y C- 9 RD T90 2 8A Shaft, Tuning 1
<S x
R24 ERD14VJ182
1.8k0,
}{ Watt, _l_ 5 %, Carbon
1 y
R1 2, 22 ERD14VJ 103 1Ok!l. XWatt, ± 5
%, C ar bon 2 y
R15 ERD1 4 VJ273 27k!l , XWatt, J_ 5 %, Carbon 1 y
R1 3, 16 ER D1 4 TJ823
82k0 ,
){ Watt, + 5
%, Car bon
2 y
ACCESSORIES
R7
ERD14 TJ561 56
00. Y.I Watt, ± 5
%. Carbon 1 y
ROK34A Shoulder Case (Complete) 1
<SJ x
Al EA
El OM01 AA Ea rphone, M agn etic, 8 fl 1 x
A2 ROC7101 Belt 1 y
VARIABLE RESISTOR
A3 R
JP39
P l ug, Antenna 1 y
R14 EVL53B851D 14 1 Ok!l (D), Volume Control 1 x
CAPACITORS
PACKING
cs ECC
D05050CC
5P F, 50WV, ± 0.25 µ F, Cer amic 1 z Pl I RPF
5A
P ol yethyle ne Cover 1 z
C12 ECKE05 472 MY 0.004 7 µF, 50WV, ±
20%,
Ceramic 1 z P2
RPP30A
P oly et hyl e ne Cover 1 z
Cl0,21
ECKE05103MY
0.01 µF, 50WV, ±
20%.
Ceramic 2 z - • P 9 133A Gi ft Box(Complete) 1 @ Y
C1
9,20, 27,34 ECKE05223P
0.0 2 2µF. 50WV. J:
1g0
%, Ceramic 4 z P3 < p 1
76A
Gift Box f (1)
<S: z
C7 ECMS05101 K-H 1
00P F, 50WV, ±
10% . Mica 1 z P4
~::i,g45A
Pad (R) Order R PK9133A
(1)
:S> z
C1 4
ECMS05180K-H 18PF,
50WV, ± 1 0%, Mica 1 z P5
'--._ °'" 946A
Pad (L ) (I )
()9 z
C16
ECQS1361 JZ 360P F, IOOWV, ±
10%, Sty ro l 1 z P6
::J> =i 95 7
Pad 1
<S
z
C11 ECOS05152JZ-T 1500PF, 50WV, ± 1
0%.
Styrol 1 z P7 R 536 1A Instructi on 8 ook
I
<;, ; y
C17
ECOS05182KZ -T
1800PF, 50WV, ±
10% . Styrol ·· R-238W 1 z
C17 ECOS05272KZ-T 270 0 PF , 50WV, ±
10%,
Styrol· ·R -238R 1 z
C,30,31
ECQG05472M Z -N 0.0047µ F, 50WV, ± 20%, Po ly es ter
I 2 z
C32,35
ECOG05682MZ-N
0.0 068µF , 50WV, ± 20%. Polyester 2 z
CABINET
Ref.N o. Part No. De
scripti on P
er Set
Rem a rks
(P cs. )
CA1
RKM 1 68A
Cabinet Only 1 @ z
CA2
XEAR B Vl 1SHBS Whip Antenna
1 y
CA3 RGBBOA Badge, Nat ional &
NA T IO AL PANASONI C M ar k 1 z
CA4 RGC31 A Ornament I ® y
CA5 RD P 76A Po inter, 0 ia/
1
<SJ
x
RYMR238WX
Ca~inet Front (C ompl e te )··· Mode l. R-238W 1 ® x
RYMR238RX Cab in et Front ( Compl ete) ... Model R-238R 1 ® x
CA6 RGK25
6A
I nd icating Plate 1 @ Y
CA7
RGL I 6A Panel, T uning Indicator light
I @ Y
CAB RGM69A Metal Grille 1
<SJ y
CA9 RKDI 85A Seate, 0 ia l Panel· ·Model R-238R 1 @ x
CA9 R KD185B
Scal e, Dial Panel ··Model R-238W 1 @ X
CA 10 R
BC3 -1
./
Button, L ight
1 y
RYA R238WX Cabinet(Complete) ···Model R-238W I @ X
RYAR238RX Cabinet (Complete) ·· ·M
odel R-238R 1 <SJ x
CA11
RKF115A
Cover Only, Cabinet Back 1 @ Y
CA12 RKK52A Cover, Battery
Compartm en t 1 ® Z
RYFR238WX
Cover (Complete), Cabinet Back· ·Mo del R-23 8W
1 <SJ y
RYE R238RX Cover (Comµlete), Cabinet Back··· M ode l R- 238R
1 · ~ · Y
CA13 RG T 276A
Nam e, Plat e"' Model R-23 8W On ly 1
<SJ y
CA1 4 RBD38A Knob, Tone
Sw itch 1 @ X
CA1 5 RBN16A
Knob , Tuning
1 x
R-238W /R-238R
720421 Q ® Printed
in Japan _