Onkyo TX 850 M Service Manual
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Extracted text from Onkyo TX 850 M Service Manual (Ocr-read)
Page 1
SERIAL NO. 3292
ONKYO SERVICE MANUAL
QUARTZ SYNTHESIZED
TUNER AMPLIFIER
MODELS TX-850/TX-850M
Black modal
BHUD, BHUDN, MBHUDN
120V AC, 60Hz
BHUG
220V AC. SDI-[z
BIIUQA
240V AC, 5 0H2
BHUW, MBHUWX
120/220v AC, 50/60Hz
SAFETY-RELATED COMPONENT WARNINGI!
COMPONENTS IDENTIFIED BY MARK A ()N
THE SCHEMATIC DIAGRAM AND IN THE PARTS
LIST ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE THESE COMPO
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
THE APPLIANCE TO THE CUSTOMER.
I ON KYO
AIIIIIII BflMPIINHIIS
TABLE OF CONTENTS
Specifications ----------------- 2
Service procedures ---------------- 3
Explndfd View ........................ 4
Parts list ----------- 5
Block diagram *IZOV model ------------- - 6
Block diagram 220V model --------------- Y
Connection diagram of microprocesmr ----------- 10
Block diagram of IC ----------------- ll
Adjustment procedures ------------------- 18
PC board view/parts list
Display / preamp/speaker ------ ----------- 21
AM/FM tuner and selector circuit ------------ 25
Power amplifier ------------------ 30
Other pc boards ---------------------- 33
Schematic diagram
120V model *Tuner ' """""""""""" Z3
120V model *Amp ----------------- 27
Other models 'TLUIEI ---------------- ' ~ ~ ' 31
Other models *Amp. """""""""""""" 35
Disassembling procedures ----------------- 37
Packing vie ......................... 38