Onkyo TX 7540 Service Manual

Page 1

SERIAL No. 3289

ONKYO SERVICE MANUAL

QUARTZ SYNTHESIZED
TUNER AMPLIFIER
MODEL TX-7540

Black and Silver models

SAFETVARELATED COMPONENT WARNINGI!
COMPONENTS IDENTIFIED BY MARK A ON
THE SCHEMATIC DIAGRAM AND IN THE PARTS
LIST ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE THESE COMPOi
NENTS WITH ONKYO PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS
MANUAL.

MAKE LEAKAGE'CURRENT 0R RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM
THE SUPPLY CIRCUIT BEFORE RETURNING

TIIE APPLIANCE TO THE CUSTOMER.

ONKYO \
Allfllll BflMPlINENIS

TABLE OF CONTENTS

Specifications -------------------- 2
Service procedures - - - '
Exploded View ......................... 4
Fans list ........................... 5
Connection diagram of microprocesmr -
Block diagram of 1C ----------------- 7
Adjustment procedures -------------------- 14
Pc board View/parts list
Disp]ay/preampjspeakex ................... 17
AM/FM tuner and selector circuit ----------- 21
Power amplifier ...................... 25
Other pc boards --------------------- 27
Schematic diagram
Tuner ........................... 19
Amp ........................... 23
Block diagram ....................... 29
Disassembling procedures --------------- 31
Packing View ........................ 32