Onkyo TX 18 Service Manual

Page 1

T 718

SERIAL NO. 3225

ONKYO SERVICE MANUAL

QUARTZ SYNTHESIZED
TUNER AMPLIFIER
MODEL TX-18

Black and Silver models

BUD, BUDNJJD

120V AC. 60Hz

BUG, UG 220V AC, SOHZ
BUQA 240V AC. SOHZ
BUW. UW 120 or 220V AC, SO/GOHZ

SAFETYRELATED COMPONENT WARNING! I
COMPONENTS IDENTIFIED BY MARK A ON
THE SCHEMA'I'IC DIAGRAM AND IN THE PARTS
LIST ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE THESE (X)MPO*
NENTS WITH ONKYO PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS
MANUAL

MAKE LEAKAGECURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM
THE SUPPLY CIRCUIT BEFORE RETURNING

THE APPLIANCE TO THE CUSTOMER.

ONKYO
AIIIIIII BIIMPIIIIIIIIS

TABLE OF CONTENTS

Specifications ........................ 2
Service procedures ..................... 3
Exploded View ----------------------- 4
Parts IISL ......................... 5
Block diagram 120V mudeI" ---------------- 6
Block diagram "220V modeI- ---------------- 7
Circuit description --------------------- g
Adjustment procedures --------------- 12

Pcb view/parts Iist

Tone/Headphone terminal -------- 15
Display/Volume control --------- 16
FM/AM tuner .............. 17
Power ampIifier ...................... 2]
Schematic diagram

VIZOV model_ ....................... 19

-220V model-r
Packing View