Sony tc 818 service manual

Page 2

TC-818

REPAIRING PRECAUTION

[To apply B+ voltage]

Thepower of this unit is fed from amlifier.

Because of this, connect the DC Power supply as
illustrated below when this unit alone operates.

DC Power
supply

GND 20VDC 2A 0
.0

+20V ~20V

AUDIO BOARD
4 Component Side -

PARTS IDENTIFICATION

30 33. 34 30 32

Cassette holder
Tape operation buttons
« » :Fast winding
l> :Forward play
<:Heverse play
I 1:810]:
IlzPause
0 :Record muting
Q : Record
2 EJECT button
13 DIRECTION MODE selector
DOLBY NFI switch
(E AMS/BLANK SKIP button
DUBBING SPEED selectors

SAFETY-RELATED COMPONENT WARNINGI!

COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL T0 SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BV SONY.

TABLE OF CONTENTS

Section Title Page
Specifications ....................... 1
Parts Identification .................... 2
Troubleshooting ...................... 2
1. DISASSEMBLY .................. 3

2. ADJUSTMENTS

2-1. Mechanical Adjustments ............ 4
2-2 Electrical Adjustments .............. 4

Section . Title Page

3. DIAG RAMS

3-1. IC80l M50964-212FP Pin Functions . . , , 7
3-2 Block Diagram ................... 9
3-3. Printed Wiring Boards .............. l 1
3-4. Schematic Diagram ................ 15
4. EXPLODED VIEWS ............... 18
5. ELECTRICAL PARTS LIST ......... 22