manual: fw23a sm sharp en

Service Manual Mode|]

FW -23(A)

SPECIFICATIONS GENERAL DESCRIPTION Frequency Range This portable has 17 transistors, 6 diodes and 2 BPCACCASE wars cxxes eon mene AM 530-1650 KC thermistors.

ae et A bar antenna feeds the AM, MB or SW broadcast

signal to the converter. FM 86.5-108 MC Af ; h

Intennediate’Enenuenoy...ANl 259 KO ter going tl rough 2 IF amplifiers and 1 diode

MB 455 KC detector, the signal then passes through a 6 transistor

SW 455 KC audio amplifier circuit.

. FM 10.7 MC A rod antenna feeds the FM broadcast signal to the Transistor Complement . RF amplifier, 3 FM IF amplifiers and FM detector OL ZOAZSICA) cc scesne snesees FM RI Amplifier (2. diodes).

Q2 25A235(C) weer FM Converter Audio signal then passes through a 6. transistor Q3 2SA234(B) wo... AM Mixer i i FM IF Amplifier audio amplifier circuit.

O4 2SA234(B)/(C) we... WM. Osctllavee An AM AGC voltage is fed back to 1st IF amplifier.

O5 2SA234(B) .........0. AM FM IF Amplifier An AFC voltage is fed back to the FM converter.

O06 25A234(B)/(C) ...... AM FM IF Amplifier | Q7 2SA234(A) oo... eee FM IF Amplifier CHASSIS REMOVAL

OS ZOB TOLD ) ws: sams semex AF Amplifier | 1. Remove battery compartment cover. O09) ZS 750) emeccaaws veer Audio Driver 2. Remove battery holder OLD! ZoAIZS cxsassaess vas AFC id

3. Remove 2 cabinet back retaining screws and 50 area aera soe remove cabinet back.

O13 2SB155( Ay... luke | A, Set dial pointer at low frequency end of dial. O14 2SB155(A)............ Output 5. Pull off the A control knobs located on the front

QI5 2SA12C veces. Color Indicator of the cabinet. | O16 2SB77(B) .....ceceeee Color Indicator 6. Insert the tip of a narrow bladed screwdriver

OTF 2SBI7 CB) co cimcn a nina» Color Indicator through the opening in the chassis and disengage Power Output the dial cord from the dial pointer. Undistorted.................. 450 mW 7. Lift the Earphone/Ext. Power jack out of its Maximum ..........c0se0e0e 700 mW slot in the side of the cabinet.

Speaker ...........s.eseeeee 0 DIR” X 314” PM 4 ohms 8. Remove the five chassis mounting screws and Bt ror Jock Ag ; gently lift the chassis out of the cabinet.

OWEPr DUDE secawssas cecuws se 4 size atteries

HAYAKAWA ELECTRIC CO., LTD. OSAKA, JAPAN

ear are Pe a et acer ea SA MR

GENERAL ALIGNMENT INSTRUCTIONS

Should it become necessary at any time to check the alignment of this receiver, proceed as follows;

1)

2)

3)

4)

5)

Connect an output meter across the speaker voice coil lugs.

Set volume control for maximum.

Use lowest setting of signal generator capable of producing adequate indication on the lowest scale of

output meter.

Use a non-metallic alignment tool.

Repeat adjustments to insure good results.

FM ALIGNMENT CHART

Signal generator

Step | Band | Connect to receiver

1 | FM. Connect signal generator

|

through a 10KQ dummy

to converter emitter, test

point 1, of Q2 ground lead

to the receiver chassis.

F.M.|Same as step 1.

: F.M. | Connect signal generator

through a 100Q, including

output impedance of

ternal antenna coil lug.

Ground lead to the re-

ceiver chassis.

| F.M. | Same as step 3.

; P.M. | Same as step 3.

signal generator to the ex-

| Exactly 10.7MC. (400%,

| Receiver

Input signal frequency | Dial setting

30%, AM modulated) closed.

Exactly 10.7 MC,

(Unmodulated)

Same as step 1.

Exactly 86MC. (400%, 30%,| Tuning gang fully | Adjust for maxi-

FM modulated)

FM modulated)

|

| {

FM. Same as step 3.

|

Exactly 108 MC. (400%,

| 30%, FM modulated)

closed.

(maximum capacity)| speaker voice coil

open.

(minimum capacity)

Exactly 88MC. (400%, 30%,| 88 MC.

Remarks Adjust

|Tuning gang fully | Connect VTVM Detune IFT4B.

between TP4 and! Tune, IFT4A, IFT3,

((maximum capacity)| chassis ground. IFT2 and IFT1 for

maximum indication.

mum output

lugs.

Exactly 110MC. (400%,; Tuning gang fully | Same as step 3.

| 30%, FM modulated)

C6

Same as step 1. | Tune IFT4B for null

| point (0 volt).

L4

105 MC.

|

i FM. Repeat steps 3, 4,5 and 6 until no further improvement is obtained.

| Same as step 3. ‘12

Same as step 3. C5

NOTE

(A) Check alignment of receiver antenna coil by bringing a piece of powdered iron (such as a coil slug) near the antenna

(B)

loop stick, then a piece of brass. If powdered iron increases output, loop requires more inductance. If brass increases

output, loop requires less inductance. Change loop inductance by sliding the bobbin toward the center of ferrite core to

increase inductance, or away to decrease inductance. This adjustment should not be required unless L6 has been replaced.

1) Connect VTVM (0.1 volts range D.C. scale) across volume control of receiver. (Grounded terminal to high side of control.)

2) Adjust discriminator Sec. core for VTVM 0 volt.

3) Change signal generator frequency 10.7 MC+100KC and —100KC approximately.

4) Adjust discriminator Pri. core for balanced peaks. Peak separation should be approximately 200 KC.

AM, MB, SW ALIGNMENT CHART

Signal pencrator | Receiver ee ee eee een ee eS ae eee

Saas | Band| Connection to receiver fe signa) frequency | Dial Poin Remarks

1 AM. Connect geal Senora React 455 KC. (400%, rnin gang fully Adjust for maximum IFT?

through a 10KQ dummy | 30%, AM modulated) open. output on speaker| IFT6

to the antenna tuning (minimum capacity)| voice coil lugs. IFT5

condenser.

Connect ground lead of

generator to the receiver

chassis. a |

2 | A.M.) Use radiating loop. ‘Exactly 520KC. (400%, Tuning gang sfally Sani as step 1. L7

Loop of several turns of | 30%, AM modulated) closed.

(maximum capacity) wire, or place generator

lead close to receiver for

adequate signal pickup. {

| Connect generator output | | 5

| Me.

jto one end of radiating

| loop.

3 AM. Sane: as step 2. Beactls 1680 KC. (400%, | Paniae gang aie oe as step 1. C9

30%, AM modulated) open.

eo. eapaciy)

4 |AM. Sieh as giep 2. Badly: “600 KC. (400%, 600 KC See NOTE A. L6

30%, AM modulated)

5s |AM. one as step 2 Exactly 1400 KC. (400%, | 1400 KC iSee NOTE A. C7 io 130%, 4 AM i madulated).

6 AM Repeat steps 2,3,4 and 5 until no further improvement is obtained.

7 MB. oe as ste 2 Exactly 1. SMC. (400% 30%, amraes gang tag Sais as step 1. L8

AM modulated) closed.

a I maximum mica pacity)

8 MB. Sao as tee 2. Exactly 4.5MC. (400%,30%, Tiine: gang fully ee as step 1. | C12

| AM modulated) closed. |

meena Capacity)

9 | M.B.|\Same as step 2 ‘| Exactly 1.7MC. (400%,30%, 1.7 MC See NOTE A. LG AM modulated) |

10 | M.B.| Same as step 2. | Exactly 3.7MC. (400%,30%,,| 3.7 MC See NOTE A. C8

| AM modulated)

11 | M.B.| Repeat steps 7, 8, 9 and 10 until no further improvement is obtained.

12 |! S.W. | Same as step 2. Exactly 5.85 MC. (400%, | Tuning gang fully ; Same as step 1. Lo

| 80%, AM modulated) closed.

j [maximum eapeeiy)|

13 | S.W.}| Same as step 2. Pebeily 18.5 MC. (400%, ee gang fully r Samed as seb 1. C11

30%, AM modulated) closed.

(maximum eapecty))

14 | S.W.i Same as step 2. Exactly 6.5MC. (400%, 30%, 6.5 MC iss NOTE A. L6

AM modulated)

15 | S.W.| Same as step 2. Exactly 16 MC. 16 MC "ieee as step 1. C10 eee ae USTED Ee eee, EEO a rs Pa ee le boca 1d ieee

16 | S.W.| Repeat steps 12, 13,14 and 15 until no further improvment is obtained.

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Figure 2 - Bottom View of PC Board

ROD. AN T. | =AM 530 -— 1650 KE | | 2=MB k6 — 43 #MC

| Ql Q2 | Os. | Q5 : Q6 Q7 £=%3=8SW 60 — 180 MC B 25A235(A) 2SA 235 (C¥ 2SA 234 (B) 250234 (B) 250234 (B/C) | 2saeza(apt =FM 86:5 — 108 MC(AFC OFF) 3

: . hasb | R28 15K mcP 1) | | sk R29

5K cia 4P 7 cl344P

IN6O

jf FM (JAFC OFF)

SW—IF,

R46 500 c 1l69

QI5Q16 QI7 2SAI2C 28877(B) 25877(8)

ny COLOR TUNING

INDICATOR

EXT. POW. J2

BATTERY

6 VOLTS

R26 FM a 1.6k arc ON)

FH-1,2 = O-1E (BLY)

Q4 2S5A234 (Bp f( cC)

TUNING 1.F AM FM

455 KC 10-7 MC

Figure 3 - Schematic Diagram

S=FM 865 — 108 MC(AFC ON)

oS FM {AFC ON)

ZZ GY—200 © +.

J]

SP]

M (AFTON ) { TONE 2S875(8) 25875 (B) SW IL

R51 500 | AM 7 , |

TRANSISTOR VOLTAGES , ee , Q 11,12,13, . |COLL,) BASE es C68 .02 4,

4,8 ov | 288155(A&) X4

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PARTS

| REF. NO. | PART NO. | DESCRIPTION |

CAPACITORS

'VC-318 C1,C2,C3,Ca, Variable, Tuning C5,C6,C7,Cg,

Cs, Cio, C11,' TO-824 Trimmer Assembly 12

Cog : D-5-509D 5 MMtd, 50V, Discap

C30,C52,C57 | ML-5-105M | .01 Mfd, 50V, 20%, Mylar Cai, Cos “ML-5-205M | .02 Mfd, 50V, 20%, Mylar Cs2,Ca3,C37,' D-2.5-205Z | .02 Mfd, 25V 42,44, 55,

76

Cs4,Ces | DU-03-302X , 30 Mfd, 3V, Electrolytic Cs5,Cao.Cas, D-5-109C 1 MMfd, 50V, Discap

39 |

Cao, Css , K-3-405Z 04 Mfd, 30V, Discap Cat _ T-5-507 J 500 MMfd, 50V, Discap

Cas -D-5~-209C 2 MMfd, 50V, Discap Cas ~D-5-309C 3 MMfd, 50V, Discap C46 'D-5-106P | 1000 MMfd, 50V, Discap Caz -ML-5-505M._ | .05 Mfd, 50V, 20%, Mylar Cag | S-5-306 J 3000 MMfd, 50V, 5%, Styrol

Cag 'S-5-507J | 500 MMfd, 50V, 5%, Styrol Cz; ~S$-5-106J :1000 MMfd, 50V, 5%, Styrol Css | T-5-307J. =, 300 MMfd, 50V, 5%, Discap C53 ML-5-506M j .005 Mfd, 50V, 20%, Mylar orn 'D-5-108F | 10 MMfd, 50V, Discap Cre -CU-06-101X | 100 MMfd, 6V, Electrolytic C59, Cr —CU-03-503X | 5 Mfd, 3V, Electrolytic Ceo | CU-03-203X | 2 Mfd, 3V, Electrolytic Coe1, Coz ~CU-06-501X : 500 Mfd, 6V, Electrolytic

Coe _K-TOK-CON .2 Mfd, 6V, Electrolytic Cés _CU-06-503K | 5 Mfd, 6V, Electrolytic Cas, Cos -ML-5-106M 001 Mfd, 50V, 5%, Mylar C69 C U-06-201 X . 200 Mfd, 6V, Electrolytic

C79 C U-03-502X 50 Mfd, 3V, Electrolytic

C73 ~ VC-903 | Variable, Fine Tuning

C74 _CU-06-602X . 60 Mfd, 6V, Electrolytic Crz T-5-157J =|: 150 MMfd, 50V, 5%, Discap Cirs K-3-205Z | .02 Mfd, 50V, Mylar Cizs,Cizo D-5-408J = 40 MMfd, 50V, 10%, Discap Ciso,Cisg_ =. D-5-509D ~—s- 5 MMfd, 50V, 10%, Discap Cis1,Cis9 | D-5-106P —-.001 Mfd, 50V, 10%, Mylar Cise D-5-108D ——- 10 MMfd, 50V, 5%, Discap Ciss3, Cis4 | D-5-409D 4 MMfd, 50V, Discap

Ciss T-5-307J =: 300 MMfd, 50V, 5%, Discap Cie _D-5-708J |: 70 MMfd, 50V, 5%, Discap Cis7 ~CU-06-502X | 50 Mfd, 6V, Electrolytic Cig ~D-5-508J 50 MMfd, 50V, 5%, Discap

RESISTORS

Ri, SW-2 | 8V-748 ok oliacPen: Volunic | ' Control With Switch

Ro : 8V-776 | 5K ohm, Pot., Tone Control

Rs 8V-775 20K ohm, Pot., Indicator | .Contol

R12R 1s,Ro9,/1/4M-5KK = 5K ohm, 1/4W, 10%, Carbon 37> 42

Ris, Ras .1/4M-30KK ‘30K ohm, 1/4W, 10%, Carbon Ris (1/4M-40KK 40K ohm, 1/4W, 10%, Carbon

i | i ee,

1 Mio

LIST

REF. NO.

Ria Res,Raz,, Rs3,R55,R56

R38

Ris, Rae

Ri7z,Reg,R30

Ri9,Re0,Rae, 51, R57

Roi,Re4,Ras, 30

Roe

R31

Rge2, R34

R39,R53,Re6o0

R40

Rai, R54

Rag

R44,R47,R50

Ras

Rag, Rag

R52, Riag

R58

R59

Ret

Rios, Riss

Rios, Rios

Rios

Rios

Rio8

Riga

|

Mi Me Ms M4, Mg, Mg

M;, Mi 1

M, My

011, O 1:2,

13, Qia4 !

Qis | |

| 1/4M-50K K

| 1/4M-3K K

| 1/4M-30K K

| PRC-325 PRC-344 PRC-343 - PRC-315

—PRC-333

| 2S A-235(C) |

PART NO.

V/AM-1KK

1/AM-15K K

1/4M-500K

1/4M-10K K

1/4M-~1.6K K 1/4M-300K 1/4M-20K 1/4M-100K 1/4M-1.2K K | 1/4M-2K K 1/4M-25K K 1/4M-200K 1/4M-10K 1/2K-1K 1/4M-50K 1/4M-20K K 1/4M-100K K 1/4M-2.2K K

1/4M-100K 1/4M-1K K 1/AM-5KK | 8V-799 1/4M-200K K |

DESCRIPTION

1K ohm, 1/4W, 10%, Carbon

50K chm, 1/4W, 10%, Carbon



500 ohm, 1/4,W, 5%, Carbon


1.6K ohm, 1/4W, 10%, Carbon

_ 300 ohm, 1/4W, 10%, Carbon

20 ohm, 1/4W, 10%, Carbon

100 ohm, 1/4W, 10%, Carbon




200 ohm 1/4W, 5%, Carbon

10 ohm, 1/4W, 10%, Carbon

} 1 ohm, 1/2W, 10%, Winding

' 50 ohm, 1/4W, 10%, Carbon





100 ohm, 1/4W, 10%, Carbon | 1K ohm, 1/4W, 5%, Carbon


15K ohm, Semi-variable


PACKAGED CIRCUITS ee

rye yay

, Giiz, Rios : Ciio, Rioz

~Cie7, Riga

PR C-306

PR C-303 Cis, Rio : Cis, Ciz, Re

! Coo, Cai, Rg, Ro

Coo, Rii & Cys, Rs & 18, Reo

Cis, Ra & Co, Ry

SEMICONDUCTORS

2S A-235(A) |

2S A-234(B) |

-2SA-12C | | 2S B-155(A) |

+

25 A-12C :

| IF Amp.

2S A-234(B\(C) 2S A-234(B). | 2S A-234(B) - 2S A-~234(A) |

2S B-75(B) | Transistor,

FM RF Amp.

FM Conv. |

AM Mixer, FM |}

Transistor,

Transistor,

Transistor,

Transistor, AM Osc.

Transistor, AM-FM IF Amp.

Transistor, AM-FM IF Amp.

Transistor, FM IF Amp.

AF Amp, and Drive.

AFC

Transistor, Audio Output (Matched Pair)

Transistor, Color Indicator

Transistor,

| REF. NO.

Q16, Qur

Dg, Da

IFT;

IFT?

D1,D2,Ds5{/De

TH,, THe

PART NO. |

28 B-77

IN-34A

1N-60

D-1E

71 F-808

71 F-767

71 F-767

7 I F-739

71 F-748

71 F-765

71 F-734

6T-782

7L-284A

7L-573C

| 7L-937

7L-057B

7L-911

7L-253A

7L-392B

7L-462B

7L-452B

DESCRIPTION

Transistor, Color Indicator

Diode,

Diode, FM Detector (Matched Pair)

Thermistor

TRANSFORMERS AND COILS

REF. NO. PART NO. DESCRIPTION

MISCELLANEOUS

ROD-ANT-71

D P-733

D P~-732

Antenna, Telscoping Rod

Cabinet (Complete)

Drum, Dual Drive

Drum, Tuning

MR-19 Earphone

ee ae Handle, Bottom

TOTTE- COVER-A | Handle, Top

ee, Handle, Bracket (Metal)

Transformer, Ist FM IF B-PIPE Holder, Battery (Plastic)

Transformer, 2nd FM IF R-A~HOLD Holder, Rod Antenna

Transformer, 3rd FM IF J ~931 Jack, Earphone/Ext. Power

Transformer, 4th FM IF OK -234 Knob, Band Switch

Transformer, lst AM IF OK -188 Knob, Lamp Switch

Transformer, 2nd AM IF 9K-181 Knob, Tuning

Transformer, 3rd AM IF OK -230 Knob, Volume, Tone and Transformer, Audio Input Fine Tuning

Coil, FM Antenna

Coil, FM RF

Coil, FM RF Choke

Coil, FM Oscillator

Coil, FM Power Choke

Coil, AM, MB, SW Antenna

Coil, AM Oscillator

Coil, MB Oscillator

Coil, SW Oscillator

PL, Pla

PL, PL2

SPi

P L-520

PL-5il

138 P-15A

2-45 9S -63 F MT-516

Lamp, Dial

Lamp, Indicator

Pointer, Dial

Speaker

Spring, Battery

Spring, Dial;Cord (A)

Spring, Dial Cord (B)

Switch, Band

Switch, Dial Lamp

FM Front End Unit

DIAL CORD STRINGING

POINTER CORD-B. eo

—~ B4 a

PULLEY

B3._

Overall length of dial cord. stringing is A: 17 1/2 B: 25 1/2 inches.

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manual: fw23a sm sharp en

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