Onkyo TX 7540 Service Manual
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Extracted text from Onkyo TX 7540 Service Manual (Ocr-read)
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