Sony cdp m 21 service manual

Page 2

CDP-M1 1/M12/M21/M41

SAFETY~RELATED COMPONENT WARNINGII

COMPONENTS IDENTIFIED BY MARK A 0R DOTTED LINE
WITH MARK A ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.

PROTEC'HON OF EYES FROM LASER BEAM DURING SERVICING

This set employs a laser. Therefore, he sure to follow carefully the
instructions below when servicing.

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK 0R
BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also use
the procedure in the printed matter which is included in the repair
parts.

The flexible board is easily damaged and should be handled with
care.

1. Laser Diode Properties

' Material: GaAlAs

' Wavelength: 780nm

Emission Duration: continuous

0 Laser Output: max.44.6p.W*

*This output is the value measured at a distance of about

200mm from the objective lens surface on the Optical Pick-up
Block.

During service, do not take the Optical Pick-up Block apart, and
do not adjust the APC circuit. If there is a breakdown in the AFC
circuit (including laser diode), replace the entire Optical Piclo
up Block (including AFC borad).

TABLE OF CONTENTS

§§ctign LN: 339$
1. GENERAL ...... ............................. 4
1-1. Location of Controls .. 4

1-2 Pin Function

2. ELECTRICAL BLOCK CHECKING ................. 7
3. DISASSEMBLY ................. 9
4. DIAGRAMS..

Section Eb Pigs
4-1. Block Diagrams .. . 10
42. Waveforms... . 13
4<3. Printed Wiring Boards
44. Schematic diagram ........................................... 17
4-5. Semiconductor Lead Layout
443. I0 Block Diagrams.

5. EXPLODED VIEWS .................. . 24

6. ELECTRICAL PARTS LIST ....... ............ 27