Onkyo TX 7640 Service Manual

Page 1

SERIAL NO. 3292

ONKYO SERVICE MANUAL

QUARTZ SYNTHESIZED
TUNER AMPLIFIER
MODELS TX-850/TX-850M

TX-7640 (Europe Model)

Black model
I
BHUD BHUDN, MBIIUDN 120V AC, 60H7.
BHUG 1 220v AC, 50H:
| BIIUQA 240V AC, 50H:

BHUW, MBHUWX

SAFETY-RELATED COMPONENT WARNING! I
COMPONENTS IDENTIFIED BY MARK A ON
THE SCHEMATIC DIAGRAM AND IN THE PARTS

120/220V AC. 50/60Hz

TABLE OF CONTENTS

Specifications: ------------------------ '2.
LIST ARE CRITICAL FOR RISK OF FIRE AND gen-ice procedures ...................... II
ELECTRIC SHOCK. REPLACE THESE COMPO Explodvd vie ......................... 4
NENTS WITH ONKYO PARTS WHOSE PART Pans 5 ........................... 5
NUMBERS APPEAR AS SHOWN IN THIS Blmjk diagram may mndpl ----------------- 6
MANUAL, Block diagram *ZZLIY model ----------------- 2'
Connediun diagram of micruprucc-Ssor ----------- 10
MAKE LEAKAGE'CURRENT 0R RESISTANCE Block diagram of IC .................... I1
MEASUREMENTS TO DETERMINE THAT EXPOSED Adjmlmt-m pmwdum .................... 13
PARTS ARE ACCEPTABLY INSULATED FROM pf board \'I(\\ 'pans [
THE SUPPLY CIRCUIT BEFORE RETURNING [)isplay'pruamp Ispcaker .................. 21
THE APPLIANCE TO THE CUSTOMER. AMTM (mm- and select." circuit ............. 25
iner amplifiPr -------------------- 30
()thr pc boards ...................... 33
Schcmalic diagram
l'Zl)\' model Tuner ---------------- 23
1qu model Amp. ------------------- 27
Other nmdeIs Tuner ------------------- 31
Olher modeIs Amp. """""""""" 35
Disgwscmblmg procedurex ---------------- 37
Parking vie ......................... 38

ONKYO
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