Pioneer mjl 7 service manual

Page 1

GD PIONEER®

The Art of Entertainment

Service
Manual

MINIDISC RECORDER

MJ-L7

THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).

ORDER NO.
RRV1848

Power Requirement Remarks

AC220-230V

AC230V

0 These products are component of systems. This product does not operate normally by itself.
Please connect it to the STEREO CD RECEIVER XC-L7 and the DISPLAY UNIT DU-L7, an accessory
of the XC-L7, for adjustment and operation inspection.

CONTENTS
1. SAFETY INFORMATION .................................... 2 7. GENERAL INFORMATION .............................. 47
2. EXPLODED VIEWS AND PARTS LIST ............. 3 7.1 IC ................................................................ 47
3. SCHEMATIC DIAGRAM ..................................... 8 7.2 DIAGNOSIS ................................................ 50
4. PCB CONNECTION DIAGRAM ....................... 25 7.2.1 DISASSEMBLY ................................. 5O
5. PCB PARTS LIST ............................................. 32 7.2.2 TROUBLESHOOTING ...................... 53
6. ADJUSTMENT .................................................. 35 7.3 BLOCK DIAGRAM ..................................... 58
8. PANEL FACILITIES AND SPECIFICATIONS
................................................................... 60

PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153, Japan
PIONEER ELECTRONICS SERVICE, INC. PO. Box 1760, Long Beach, CA 90801-1760, U.S.A.

PIONEER ELECTRONIC (EUROPE) N.V . Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium

PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 501 Orchard Road, #10-00 Lane Crawford Place, Singapore 0923

© PIONEER ELECTRONIC CORPORATION 1997 T-KZE SEPT. 1997 Printed in Belgium

Page 2

MJ-L7

1. SAFETY INFORMATION

LABEL CHECK

CLASS I
LASER PRO

DUCT

ARWIO46

1 .

Additional Laser Caution

Laser Interlock Mechanism

The position of the switch (SW1956) for detecting loading
state is detected by the MD mechanism microprocessor
(IC1401), and the design prevents laser diode oscillation
when the switch (SW1956) is OFF (Pin 6 of IC1401 is high
level.). Thus, the interlock will no longer function it the
switch (SW1956) is deliberately set to ON. (Pin 6 of
IC1401 is low level.)

The interlock also does not function in the test mode*.
Laser diode oscillation will continue, if pin 20 of IR3R50
(IC1101) is connected to GND, or else the terminals
(between emitter and collector) of 01101 are shorted to
each other.

. When the cover is opened with the shielding case of MD

mechanism assy (AYM7003) is further opened, close
viewing of the objective lens with the naked eye will cause
exposure to a Class 1 laser beam.

* Refer to page 35 .

AOVARSEL

VORSICHT I

USYNLlG LASERTRALING VED UNSICHTBARE LASER-STRAHLUNG
ABNING MAR SIKKERHED SAF- mm Aus, WENN DECKELIDDER
BRYDERE ER UDE AF FUNKTION. KLAPPEIGEUFFNET lST! mcut

UNDBA UDSIETTELSE F

STRALING.
VABD !

OR DEM STRAHL AUSSETZENI

VARNING I

Avattaessa ia suojalukitus ohitetta- Osynlig laserstrélning nér denna dal
8383 0121 alttiina nakymfittnmfille 3r bppnad och spalren tit urkopplad.

lasersfiteilylle. Illa katso sfiteeseen. Betrakta ei stralen.

CAUTION

ARWIO47

MYXK type

INVISIBLE LASER RADIATION

WHEN OPEN, AVOI
EXPOSURE TO BEAM

D

ARWIOfiO

NVXK type