Sony MZ-300 specifications Section Servicing Note

MZ-E300
	TABLE OF CONTENTS
Specifications		1
1.	SERVICING NOTE	2
2.	GENERAL
	Preparing a Power Source	3
	To Connect the Headphones/Earphones	3
	Playing an MD	3
3.	DISASSEMBLY
	3-1. “Lid ASSY, Upper”, Holder ASSY	4
	3-2. Mechanism Deck	4
	3-3. Main Board	5
	3-4. Optical Pick-up ASSY	5
4.	TEST MODE	6
5.	DIAGRAMS
	5-1. Explanation of IC Terminals	13
	5-2. Block Diagram	18
	5-3. Printed Wiring Boards – Main Section (1/2) –	19
	5-4. Printed Wiring Boards – Main Section (2/2) –	20
	5-5. Schematic Diagram – Main Section (1/3) –	21
	5-6. Schematic Diagram – Main Section (2/3) –	22
	5-7. Schematic Diagram – Main Section (3/3) –	23
6.	EXPLODED VIEWS
	6-1. Main Section	29
	6-2. Mechanism Deck Section	30
7.	ELECTRICAL PARTS LIST	31

CAUTION

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

Flexible Circuit Board Repairing

•Keep the temperature of the soldering iron around 270° C during repairing.

•Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

•Be careful not to apply force on the conductor when soldering or unsoldering.

Notes on chip component replacement

•Never reuse a disconnected chip component.

•Notice that the minus side of a tantalum capacitor may be dam- aged by heat.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 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.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR LES

DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

SECTION 1

SERVICING NOTE

When repairing this device with the power on, if you remove the main board, this device stops working.

In this case, you work without the device stopping by fastening the hook of the Open/Close detection switch (S808).

Open/Close detection switch (S808)

Note on IC replacement

If using flux on replacing IC801 etc., clean it with alcohol or equivalent, and after that, check carefully there are no dust or rags in between pins.

Especially, be sure to check between pins 4 and 5.

2