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MD-MT15/15C/15H/15W/161E/18H

– 1 –

Page

SAFETY PRECAUTION FOR SERVICE MANUAL (MD-MT15W/15H/18H/161E ONLY) ..................................................... 2

SPECIFICATIONS ................................................................................................................................................................. 3

NAMES OF PARTS ............................................................................................................................................................... 4

OPERATION MANUAL .......................................................................................................................................................... 5

QUICK GUIDE (MD-MT15 ONLY) ......................................................................................................................................... 8

DISASSEMBLY.................................................................................................................................................................... 10

NOTES ON SCHEMATIC DIAGRAM .................................................................................................................................. 11

TYPES OF TRANSISTOR AND DIODE .............................................................................................................................. 11

VOLTAGE ............................................................................................................................................................................ 12

BLOCK DIAGRAM ............................................................................................................................................................... 13

SCHEMATIC DIAGRAM ...................................................................................................................................................... 14

WIRING SIDE OF P.W.BOARD........................................................................................................................................... 17

WAVEFORMS OF MD CIRCUIT ......................................................................................................................................... 22

PARTS GUIDE/EXPLODED VIEW

PACKING OF THE SET (MD-MT15 FOR U.S.A. ONLY)

PACKING METHOD (MD-MT161E ONLY)

SERVICE MANUAL

SHARP CORPORATION

No. S7946MDMT15//

This document has been published to be used

for after sales service only.

The contents are subject to change without notice.

MD-MT15(S)

MD-MT15C(S)

MD-MT15H(RD)

MD-MT15H(S)

MD-MT15W(S)

MD-MT161E(S)

MD-MT18H(GR)

• In the interests of user-safety the set should be restored to its

original condition and only parts identical to those specified be

used.

Illustration: MD-MT15/15C

Illustration: MD-MT15H/15W

Illustration: MD-MT161E/18H (Only printing is different.)

CONTENTS OF MD-MT15/15C/15H/15W/161E/18H

The machine MD-MT15/MT15C/MT15W is a modification of

MD-MT20/MT20C/MT20W the difference is the Top Cabinet.

Its performance and operation are identical with those of MD-

MT20/MT20C/MT20W. For details refer to the service manual

(No.S6943MDMT20//) for MD-MT20/MT20C/MT20W.

MD-MT20/MT20C/MT20W

Page

REMOVING AND REINSTALLING THE MAIN PARTS 11

ADJUSTMENT.............................................................. 12

TROUBLE SHOOTING................................................. 37

FUNCTION TABLE OF IC ............................................ 40

CIRCUIT DESCRIPTION.............................................. 42

The machine MD-MT15H/MT161E/MT18H is a modification

of MD-MT20H/MT16E the difference is the Top Cabinet. Its

performance and operation are identical with those of MD-

MT20H/MT16E. For details refer to the service manual (No.

S5933MDMT20H/) for MD-MT20H/MT16E.

MD-MT20H/MT16E

Page

REMOVING AND REINSTALLING THE MAIN PARTS.. 9

ADJUSTMENT.............................................................. 10

TROUBLE SHOOTING................................................. 35

FUNCTION TABLE OF IC ............................................ 38

CIRCUIT DESCRIPTION .............................................. 40

1 2 3 4 5 6 ... 31 32

Sommario

Pagina 1 - SERVICE MANUAL

MD-MT15/15C/15H/15W/161E/18H– 1 –PageSAFETY PRECAUTION FOR SERVICE MANUAL (MD-MT15W/15H/18H/161E ONLY) ...

Pagina 2

MD-MT15/15C/15H/15W/161E/18H– 10 –1 Bottom Cabinet 1. Screw ...(A1) x7 10-12 Top Cabinet 1. Open the Top cabinet. 10-12

Pagina 3 - SPECIFICATIONS

MD-MT15/15C/15H/15W/161E/18H– 11 –SW401 EJECT OFF—ONSW402 HOLD OFF—ONSW403 DISC LID OPEN OFF—ONSW902 DISC PROTECT OFF—ONNOTES ON SCHEMATIC DIAGRAM• Re

Pagina 4 - NAMES OF PARTS

MD-MT15/15C/15H/15W/161E/18H– 12 –PIN NO. VOLTAGE 1 2456789101112131415161718192021222324252627282930313233343536373839404142434445464748PIN NO. VOL

Pagina 5 - OPERATION MANUAL

MD-MT15/15C/15H/15W/161E/18H– 13 – Figure 13 BLOCK DIAGRAM IC651HEAD UP/DOWNDRIVERLB1930M VCC VSIC351HEAD DRIVER74ACT02TVCC VEE2.8VUP CO

Pagina 6

MD-MT15/15C/15H/15W/161E/18H– 14 –• The numbers 1 to 18 are waveform numbers shown in page 22.ABCDEFGH123456Figure 14 SCHEMATIC DIAGRAM (1/3)• N

Pagina 7

MD-MT15/15C/15H/15W/161E/18H– 15 –78 9 10 11 12Figure 15 SCHEMATIC DIAGRAM (2/3)P14P15 P16TP064BTP070BTP086BTP087BTP088BCC5061000P TP082 TP089 TP087 T

Pagina 8 - QUICK GUIDE (MD-MT15 ONLY)

MD-MT15/15C/15H/15W/161E/18H– 16 –• The numbers 1 to 18 are waveform numbers shown in page 22.ABCDEFGH123456Figure 16 SCHEMATIC DIAGRAM (3/3)• N

Pagina 9

MD-MT15/15C/15H/15W/161E/18H– 17 –ABCDEFGH123456Figure 17 WIRING OF P.W.BOARD (1/5)OPTICAL PICKUPUNIT(13)MAGNETIC HEAD FLEXIBLE PWB(18)MAGNETIC HEAD(2

Pagina 10 - DISASSEMBLY

MD-MT15/15C/15H/15W/161E/18H– 18 –• The numbers 1 to 18 are waveform numbers shown in page 22. : Through-hole where the top, bottom and +

Pagina 11 - NOTES ON SCHEMATIC DIAGRAM

MD-MT15/15C/15H/15W/161E/18H– 19 –78 9 10 11 12Figure 19 WIRING OF P.W.BOARD (3/5)R270R258R257Q252R256SW801 R250IC806R251D812IC803 R268L821L822C821R60

Pagina 12 - MD-MT15/15C/15H/15W/161E/18H

MD-MT15/15C/15H/15W/161E/18H– 2 –Figure 2-1 Figure 2-2Precaution to be taken when replacing and servicing the Laser Pickup.The AEL (Accessible Emissio

Pagina 13

MD-MT15/15C/15H/15W/161E/18H– 20 –Figure 20 WIRING OF P.W.BOARD (4/5)ABCDEFGH123456• The numbers 1 to 18 are waveform numbers shown in page 22.

Pagina 14

MD-MT15/15C/15H/15W/161E/18H– 21 –78 9 10 11 12Figure 21 WIRING OF P.W.BOARD (5/5)R701C452C735IC701 C734C733C776L452L71134872156J703HEADPHONESJ702MICI

Pagina 15

MD-MT15/15C/15H/15W/161E/18H– 22 –WAVEFORMS OF MD CIRCUITNORM:200kS / s1994 / 12 / 15 22:54:19=Filter= =Offset= =Record Length=Smoothiing : OFFBW

Pagina 16

MD-MT15/15C/15H/15W/161E/18HPARTS GUIDENOTE:Parts marked with “ ” are important for maintaining the safety of the set.Be sure to replace parts with sp

Pagina 17

PRICERANKDESCRIPTIONNO.PARTS CODE NO. PARTS CODEPRICERANKDESCRIPTIONMD-MT15/15C/15H/15W/161E/18H– 1 –INTEGRATED CIRCUITSIC101 VHIIR3R55//-1 J AQ RF Si

Pagina 18 - MAIN PWB-A1 (BOTTOM VIEW)

NO.PRICERANKDESCRIPTIONPARTS CODENO. PARTS CODEPRICERANKDESCRIPTIONMD-MT15/15C/15H/15W/161E/18H– 2 –C622 VCKYCY1CB104K J AB 0.1 µF,16VC651 VCKYTV1CF10

Pagina 19 - 8 9 10 11 12

PRICERANKDESCRIPTIONNO.PARTS CODE NO. PARTS CODEPRICERANKDESCRIPTIONMD-MT15/15C/15H/15W/161E/18H– 3 –R801 VRS-CY1JB222F J AA 2.2 kohms,1/16WR802 VRS-C

Pagina 20

NO.PRICERANKDESCRIPTIONPARTS CODENO. PARTS CODEPRICERANKDESCRIPTIONMD-MT15/15C/15H/15W/161E/18H– 4 –224 PSHEZ0043AWZZ J AB Sheet,Bottom Cabinet Sheet2

Pagina 21

MD-MT15/15C/15H/15W/161E/18HABCDEFGH123456Figure 5 MD MECHANISM EXPLODED VIEW– 5 –M903M902M901503x2502x3508x2501x21150524185095128-2(SW902)8-188-3(PH

Pagina 22 - Measurement

MD-MT15/15C/15H/15W/161E/18HABCDEFGH123456Figure 6 CABINET EXPLODED VIEW– 6 –MD MECHANISM202-2202-1202201201-1603x2203205207206204201-2214216x22152132

Pagina 23 - PARTS GUIDE

MD-MT15/15C/15H/15W/161E/18H– 3 –FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TOTHE OPERATION MANUAL.Specifications for this

Pagina 24

MD-MT15/15C/15H/15W/161E/18H– 7 –PACKING OF THE SET (MD-MT15 FOR U.S.A. ONLY)Setting position of switches and knobsUNIT HOLD OFFQuick GuideOperation M

Pagina 25

MD-MT15/15C/15H/15W/161E/18H– 8 –PACKING METHOD (MD-MT161E ONLY)Setting position of switches and knobsUNIT HOLD OFF1. Connecting Cord, RCA Type QCNWG0

Pagina 26

MD-MT15/15C/15H/15W/161E/18HA9907-5599NS•HA•MSHARP CORPORATIONCommunication Systems GroupQuality & Reliability Control CenterHigashihiroshima, Hir

Pagina 27

MD-MT15/15C/15H/15W/161E/18H– 4 –NAMES OF PARTSIllustration: MD-MT15/15C123456789101112131415 1633343522172818 20 2123272625241929303231 1. Monaural

Pagina 28

MD-MT15/15C/15H/15W/161E/18H– 5 –OPERATION MANUALRECORDING USING THE OPTICAL DIGITAL CABLEThis is the method used for recording digi-tal signals from

Pagina 29

MD-MT15/15C/15H/15W/161E/18H– 6 –Many potential “problems” can be resolved by the owner without calling a service techni-cian.If something seems to be

Pagina 30

MD-MT15/15C/15H/15W/161E/18H– 7 –● The battery is run down.● Nothing is recorded.● No copy can be made because ofthe SCMS copyright system.● A track c

Pagina 31

MD-MT15/15C/15H/15W/161E/18H– 8 –QUICK GUIDE (MD-MT15 ONLY)1Check the supplied accessories / Compruebe los accesorios suministrados2Power source / Ali

MD-MT15/15C/15H/15W/161E/18H– 9 –2121334Mientras se produce el sonido del equipo externoconectado a este aparato, pulse el botón o para ajustar el ni