Onkyo A 8850 Service Manual
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Extracted text from Onkyo A 8850 Service Manual (Ocr-read)
Page 1
-8850
Ref. No. 3405
ONKYO® SERVICE MANUAL
Integrated Stereo Amplifier
MODEL A-8850
Black and silver models
SAFETY-RELATED COMPONENT WARNING
COMPONENTS IDENTIFIED BY MARK A ON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE CRITI-
CAL FOR RISK OF FIRE AND ELECTRIC SHOCK, REPLACE
THESE COMPONENTS WITH ONKYO PARTS WHOSE PARTS
NUMBERS APPEAR AS SHOWN IN THIS MANUAL.
MAKE LEAKAGEACURRENT OR RESISTANCE MEASURE-
MENTS TO DETERMINE THAT EXPOSED PARTS ARE AC-
CEPTABLY INSULATED FROM THE SUPPLY CIRCUIT
BEFORE RETURNING THE APPLIANCE TO THE CUS-
TOMER.
TABLE OF CONTENTS
Specifications .......................
Precautions ..........
Adjustment procedures . .
IC block diagram iiiii
Block diagram .......
Chassis exploded view . .
Printed Circuit board pans Iisl
Printed circuit board view . .
Schematic diagram .
Packing pan list . . i. iiiiiiiii
Front panel facilities . . .................... 25
System connections .................................. 25
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Page 2
8850
SPECIFICATIONS
Power Output: 80 watts per channel, min. RMS. at 8 ohms.
both channels driven from 20 Hz to 20 kHz,
with no more than 0.008% Total harmonic
distortion.
Dynamic Power: 210 watts at 2 ohms,
167 watts at 4 ohms
115 watts at 8 ohms
Total Harmonic Distortion 0,008% at rated power
0.008% at 1 wart output
Intermodulation Distortion: 0.005% at rated power
Damping Factor: 150 at 8 ohms (1 kHz)
Input Sonsilivity/ Phono (MM): 2.5 mV/SO kohms
Impedance: Phone (MC): 160 pV/I 30 ohms
CD; 150 rriV/30 kohms
TUNER: 150 mV/30 kohms
Tape Play: 150 rnV/30 kohms
Output Level/impedance: Tape Rec: 150 mV/i .0 kohms (Phone)
Phone Overload: Phone (MM): 180 rrIV RMSt fl! 1 kHz,
0.01 5% TH D.
Torte Control
(Vol -20 dB): BASS: *8 dB at 100 Hz
TREBLE: :3 dB at 10 ka
High Cut: 6 kHz (5 dB/Octava) (TFIEBLE min.)
Frequency Response: CD. Tuner: 2 Hz -50 kHz
(+0, -1 dB)
RlAA Deviation: Phone (MM): 103 dB, 20 Hz -20 kHz
Subsonic Filter: 20H: (-3dB. Goa/Oct)
Signal to Noise Phono (MM): 93 113 (5.0 mV input)
Ratio (IHF
Attenuator: -20 dB
Muting: - 00
Power Supply: European models: AC230V. 50 Hz
Dimensions (W X H x D):455 X 170 X 420 mm
17-15/16' X 641/16" X16-9/16"
Weight: 15.5 kg
Specifications and leatures are subject to change without notice.
PRECAUTIONS
1. Replacing the fuses
For continued protection against risk fire, replace only with same type and same rating fuse.
CIRCUIT NO. PART NO. DESCRIPTION,
F901 252075 2.5A-SE-EAK. Primary {use
F902 252076 3.15A-SE-EAK. Primary fuse