AIWA HS EM50 Service Manual

HS-EM50

Y

SERVICE MANUAL

STEREO CASSETTE PLAYER

• This Service Manual is for HS-EM50 (Y1SC) Silver color and
HS-EM50 (Y1LMC) Metallic Blue color.

BASIC TAPE MECHANISM : 4ZM-2 P3NC2

S/M Code No. 09-009-427-3N1

DATA

SPECIFICATIONS

Maximum output: 4 mW + 4 mW (EIAJ 16 ohm)
Power source: DC 3 V using two R6 (size AA) batteries
Maximum dimensions: 116.4 (W) x 92 (H) x 34.9 (D) mm

(45/

x 35/

x 13/

8

Weight: Approx. 114.2 g (4 oz) (excluding batteries)

in.)

8

8

• Design and specifications are subject to change without

notice.

• Dolby noise reduction manufactured under license from Dolby

Laboratories Licensing Corporation.

“DOLBY” and the double-D symbol are trademarks of Dolby

Laboratories Licensing Corporation.

ACCESSORIES / PACKAGE LIST

PART NO.

DESCRIPTIONREF. NO. KANRI

NO.

1 8A-HK9-908-010 IB,Y(EGFSI)C EM50
1 8A-HK9-909-010 IB,Y(EDPOHCZ)C EM50
2 84-447-019-310 CLIP,BELT
3 87-B30-155-210 HEADPHONE,HP-M006 BL(T)
3 87-B30-401-010 HEADPHONE,HP-M006 (K2)

- 2 -

ELECTRICAL MAIN PARTS LIST

PART NO. DESCRIPTION

IC

87-A21-638-040 IC,MM1336CF
87-017-805-080 IC,AN7375NS(OP AMP)

TRANSISTOR

87-026-264-080 C-TR,RN1411

DIODE

87-020-027-080 C-DIODE, 1SS184

MAIN C.B

C1 87-010-179-080 CAP,CHIP S 1200P-50
C2 87-010-179-080 CAP,CHIP S 1200P-50
C3 87-010-178-080 CHIP CAP 1000P
C4 87-010-178-080 CHIP CAP 1000P
C5 87-015-676-040 CAP,E 47-6.3

C6 87-015-676-040 CAP,E 47-6.3
C7 87-015-676-040 CAP,E 47-6.3
C8 87-010-196-080 CHIP CAPACITOR,0.1-25
C9 87-010-213-080 C-CAP,S 0.015-25 B
C10 87-010-213-080 C-CAP,S 0.015-25 B

C11 87-010-805-080 C-CAP,S 1-16 F
C12 87-010-194-080 CAP, CHIP 0.047
C13 87-015-681-040 E/CAP 10-16
C14 87-010-196-080 CHIP CAPACITOR,0.1-25
C15 87-010-805-080 C-CAP,S 1-16 F

C16 87-010-805-080 C-CAP,S 1-16 F
C17 87-010-180-080 C-CER 1500P
C18 87-010-180-080 C-CER 1500P
C20 87-A10-489-040 CAP,E 220-4 7L SR
C21 87-A10-489-040 CAP,E 220-4 7L SR

C22 87-010-805-080 C-CAP,S 1-16 F
C23 87-010-197-080 CAP, CHIP 0.01-25 K B
C24 87-010-197-080 CAP, CHIP 0.01-25 K B
C25 87-010-805-080 C-CAP,S 1-16 F
C26 87-010-805-080 C-CAP,S 1-16 F

KANRI
NO.

DESCRIPTIONREF. NO.

REF. NO. KANRI

C51 87-010-178-080 CHIP CAP 1000P
C52 87-010-196-080 CHIP CAPACITOR,0.1-25
C53 87-010-805-080 C-CAP,S 1-16 F
C54 87-A10-489-040 CAP,E 220-4 7L SR
C351 87-016-087-080 C-CAP,S 0.47-16 F Z

C352 87-016-087-080 C-CAP,S 0.47-16 F Z
C353 87-010-196-080 CHIP CAPACITOR,0.1-25
C354 87-010-196-080 CHIP CAPACITOR,0.1-25
C355 87-010-186-080 CAP,CHIP 4700P
C356 87-010-186-080 CAP,CHIP 4700P

C357 87-010-193-080 CHIP CAPACITOR,0.033
C358 87-010-193-080 CHIP CAPACITOR,0.033
C359 87-010-186-080 CAP,CHIP 4700P
C360 87-010-186-080 CAP,CHIP 4700P
C361 87-010-805-080 C-CAP,S 1-16 Z F

C362 87-010-805-080 C-CAP,S 1-16 Z F
C363 87-010-805-080 C-CAP,S 1-16 Z F
C364 87-010-805-080 C-CAP,S 1-16 Z F
C365 87-015-676-040 E/CAP 47/6.3
C367 87-010-188-080 CAP,CHIP 6800P

C368 87-010-188-080 CAP,CHIP 6800P
J1 85-HRL-623-010 JACK,3.5 ST BLK
R54 87-022-657-080 RES,0.68-1/8W G 4300 PPM
SFR1 87-A90-789-080 C-SFR,470 RH03AXA12X
SFR2 87-A90-789-080 C-SFR,470 RH03AXA12X

SFR51 87-024-197-010 SFR,1K H VZ066L3
SW1 87-A90-133-110 SW,LEAF LSA1120JAU
SW2 87-A90-917-010 C-SW,SL 1-1-2 SS-350
TH51 87-026-256-090 THERMISTOR, HT-100
VR1 87-A91-724-010 VR,RTRY 20KAX2

FRONT C.B

C401 87-016-083-080 C-CAP,S 0.15-16 KR
C402 87-016-083-080 C-CAP,S 0.15-16 KR
C403 87-010-805-080 C-CAP,S 1-16 ZF
SW351 87-036-304-080 C-SW,SL 1-1-2 SS-350
SW401 87-A90-330-080 C-SW,SL 1-1-2 SSSS81 T1.4

PART NO.

NO.

CHIP RESISTOR PART CODE

Chip Resistor Part Coding

88

A

Resistor Code

Chip resistor

Wattage Type Tolerance
1/16W 1005 5% CJ

1/16W
1/10W

1/8W

1608
2125

3216

5%
5%

5%

Symbol

CJ
CJ

CJ

Figure

Value of resistor

Form

L

– 3 –

Dimensions (mm)

t

W

0.55

Resistor Code

108
118

128

LW t

1.0 0.5 0.35 104

1.6 0.8 0.45
2 1.25 0.45

3.2

1.6

: A
: A

TRANSISTOR ILLUSTRATION

C

B

E

RN1411

– 4 –

WIRING

101112131415161718192021222324

1234567892526272829303132

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

– 5 –

R

S

T

U

SCHEMATIC DIAGRAM

– 6 –

ADJUSTMENT

A

MAIN C.B

P HEAD

FWD

3

TP1

(L-CH)

A

*

B

C

SFR 51

Note :

* : On the other soldering pattern side.

4 2

1

*

TP2

(R-CH)

2

SFR 2

*

*

SFR 1

2

VOLUME

PHONES

VR1

J1

1

1. Tape Speed Adjustment
Settings : • Test tape : TTA – 100

(Tape center)

• Test point : Phones Jack (J1)

• Adjustment location : SFR51

• Tape selector : NORM

• Volume : Non – clip
(MAX – 10 dB down)

Method : Play back the test tape and adjust SFR51 so that the

frequency becomes 3000 Hz ± 10 Hz. Then confirm
WOW is less than 0.52%.

2. Dolby Level Adjustment
Settings : • Test tape : TTA – 200

• Test point : TP1 (L – CH)
TP2 (R – CH)

• Adjustment location : SFR1 (LCH)
SFR2 (RCH)

• Dolby NR : OFF

• Tape selector : NORM

Method : Play back (FWD) the test tape and adjust SFRs so that

the test point becomes 100 mV ± 1 dB.

3. Head Azimuth Adjustment
Setting : • Test tape : TTA – 330 / TTA – 420

• Volume : MAX

• Tape selector : NORM

• Adjustment location : Head azimuth adjustment
screw

Method : Play back (FWD) the test tape and adjust screw so that

the 8 kHz signal output is maximum.

4. GOVERNER Check
Perform the STOP —> PLAY and REVERSE operations
(or PAUSE ON —> OFF) after the motor is replaced. When the tape
starts running smooth, this adjustment is not necessary. If wow is

conspicuous at the beginning of the tape-run, perform this adjustment

following the procedures below.

1) Solder resistor pattern (A) of the MOTOR AND
GOVERNOR MATCHING ADJ. resistor group.

2) Set the tape speed (using speed adjustment SFR51).

3) Restrict the motor rotation by hand (or turn PAUSE ON).

4) Remove your hand and listen to the beginning of the
tape-run.

5) When the rise of tape running is smooth, no more
adjustment is necessary.
If wow continues for 1 to 2 seconds at the rise time,
change the combined resistance according to procedure
6 and check that the tape starts running smooth.

6) Solder the resistor pattern according to the table below

Pattern

Step (1)
Step (2)
Step (3)
Step (4)
Step (5)
Step (6)
Step (7)

Low
resistance

A

Medium
resistance

Open
Open
Open

Open
Solder
Solder
Solder Solder

Open Open

Solder
Solder Solder

Open Solder

B

High
resistance

SolderOpen

Open

OpenOpen

Open

Step (8) Solder Solder Solder

(NOTE : = 2.2 ohm, = 8.2 ohm, = 10 ohm)

7) Finally re-check the tape speed.

A

B

C

Caution : Cool the patterns down to normal tempera-

ture after soldering. If the pattern remains
heated, the gorvernor circuit does not operate
normally.

C

– 7 –

MECHANICAL EXPLODED VIEW 1 / 1 MECHANICAL PARTS LIST 1 / 1

NO.

PART NO.

1 8A-HGA-005-010 KNOB,SL DOLBY
2 8A-HK9-002-110 PANEL,CASS
3 8A-HK9-003-010 PLATE,IND SBASS
4 8A-HGA-006-010 PLATE,IND DOLBY
5 86-HRM-205-010 SPR-T,CLICK

6 8A-HK9-017-010 LID,CASS EM50<[S]50Y>
6 8A-HK9-018-010 LID,CASS EM50 MBLU<[LM]50Y>
7 8A-HRL-202-010 SPR-P,CASS
8 87-HRR-206-010 PLATE,HEAD J034N<[S]50Y>
8 88-HKB-205-010 PLATE,HEAD V10<[LM]50Y>

9 88-HRJ-038-010 FRAME,CENTER J034N<[S]50Y>

9 88-HKA-027-010 FRAME,CENTER V10<[LM]50Y>
10 86-HKA-202-010 BAT-CONTACT,(+)
11 8Z-HG8-202-010 HLDR,DC JACK
12 8Z-HG8-203-010 BAT,CONTACT(-)

13 88-HG8-025-010 LID,BATT J-224B<[LM]50Y>
13 8Z-HG8-018-010 LID,BATT J049N<[S]50Y>
14 8A-HK9-007-010 CABI,REAR YZ<[S]50Y>
14 8A-HK9-008-010 CABI,REAR YZ MBLU<[LM]50Y>
15 8Z-HGA-017-010 KNOB,SL DOLBY J224B<[LM]50Y>

15 8Z-HGA-013-010 KNOB,SL DOLBY J049N<[S]50Y>

A 87-264-525-310 SCREW, V+1.7-2.5

B 87-067-732-010 TAPPING SCREW, VT1.4-3

C 87-067-691-010 SCREW VT+1.7-6

D 87-067-384-010 SCREWVT1.4-3.5HL

KANRI
NO.

DESCRIPTIONREF.

– 8 –

COLOR NAME TABLE

Basic color symbol Color Basic color symbol Color Basic color symbol Color

B Black C Cream D Orange
G Green H Gray L Blue

LT Transparent Blue N Gold P Pink

R Red S Silver ST Titan Silver
T Brown V Violet W White

WT Transparent White Y Yellow YT Transparent Yellow

LM Metallic Blue LL Light Blue GT Transparent Green
LD Dark Blue DT Transparent Orange GM Metallic Green

YM Metallic Yellow DM Metallic Orange PT Transparent Pink

LA Aqua Blue

TAPE MECHANISM EXPLODED VIEW 1 / 1

A

26

FRAME,CENTER

2

10

25

29

27

1

28

24

23

3

4

17

19

22

21

16

5

11

18

20

6

7

15

14

13

9

12

8

– 9 –

TAPE MECHANISM PART LIST 1 / 1

PART NO.

NO.

1 84-ZM2-012-010 LEVER,PLAY G
2 84-ZM2-211-01K GEAR,CONNECT
3 84-ZM2-222-010 SPR-T,PLAY
4 84-ZM2-015-010 LEVER,STOP G
5 84-ZM2-014-010 LEVER,REW G

6 84-ZM2-013-010 LEVER,FF G
7 84-ZM2-223-010 SPR-T,REW STOP
8 84-ZM2-232-010 BELT,MAIN
9 09-001-421-010 FLY-WHL,P ASSY
10 87-A90-272-010 HEAD,PH MS25P ETH

11 84-ZM2-220-01K BRG,P
12 84-ZM2-210-01K GEAR,AUTO
13 84-ZM2-218-01K CAP,GEAR AUTO
14 84-ZM2-208-01K LEVER,SHIFT
15 84-ZM2-224-010 SPR-T,FF LOCK

16 84-ZM2-207-01K LEVER,AUTO
17 84-ZM2-206-01K LEVER,LOCK
18 84-ZM2-219-01K PULLEY,MOTOR
19 87-045-385-010 MOT (BCY3B11)
20 84-ZM2-226-010 SPR-C,CLUTCH

21 84-ZM2-212-01K GEAR,CLUTCH
22 84-ZM2-231-010 FELT,CLUTCH
23 84-ZM2-217-01K SHAFT,REEL
24 84-ZM2-225-010 SPR-T,AUTO FIND
25 84-ZM2-216-01K REEL TABLE,R

26 84-ZM2-215-01K REEL TABLE,L
27 84-ZM2-228-010 SPR-C,BT
28 84-ZM2-233-110 PINCH ROL ASSY
29 84-ZM2-227-010 SPR-C,AZIMUTH
A 84-ZM2-242-019 S-SCREW,AZIMUTH-2-5.9

DESCRIPTIONREF. NO. KANRI

– 10 –

2–11, IKENOHATA 1–CHOME, TAITO-KU, TOKYO 110, JAPAN TEL:[phone]

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