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For U.S.A., Canada, Europe, Asia,
China, Hong Kong, Taiwan R.O.C.,
Korea & Japan model



Ver. 2
SERVICE MANUAL



AV SURROUND RECEIVER/AMPLIFIER




Please use this service manual with referring to the
operating instructions without fail.


Some illustrations using in this service manual are
slightly different from the actual set.




16-11, YUSHIMA 3-CHOME, BUNKYOU-KU, TOKYO 113-0034 JAPAN
Telephone: 03 (3837) 5321

X0163 V.02 DE/CDM 0302
AVR-2803/983/AVC-2870 2




SAFETY PRECAUTIONS
The following check should be performed for the continued protection of the customer and service technician.

LEAKAGE CURRENT CHECK
Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to chassis
resistance check. If the leakage current exceeds 0.5 milliamps, or if the resistance from chassis to either side of the
power cord is less than 460 kohms, the unit is defective.




500V


1M


(1)




(2)




(1)

(2)




2
AVR-2803/983/AVC-2870 3




Top Cover




Hook




Front Panel


Hook


Hook Hook




Inner Panel




3
AVR-2803/983/AVC-2870 4




Nut
Round Knob



Square Knob
Nut




Round Knob




Pre-out Unit
Component Video Unit
Amp Connect Unit




Regulator Unit




4
AVR-2803/983/AVC-2870 5




Rear Panel




Chassis




5
AVR-2803/983/AVC-2870 6




VOLUME LEVEL
REMOTE SIGNAL SURROUND
SENSOR BACK CH
DIGITAL OUTPUT



INPUT SIGNAL
ON / STANDBY AUTO PCM DTS DETECT




1 2




6
AVR-2803/983/AVC-2870 7




-




7
AVR-2803/983/AVC-2870 8




SR ch
VR302


SR ch
TP101
SL ch

FR ch

SL ch
VR301

FR ch
VR102


FL ch
VR101
DC Voltmeter
C ch
VR201

FL ch

C ch TP301
SBR ch

SBL ch

SBR ch
VR402


SBL ch
VR401




Audio Section




8
AVR-2803/983/AVC-2870 9
BLOCK DIAGRAMS (1/2)




9
AVR-2803/983/AVC-2870 10
BLOCK DIAGRAMS (2/2)




10
AVR-2803/983/AVC-2870 11
LEVEL DIAGRAMS (1/4)




Correctives in VOL circuit

Other




11
AVR-2803/983/AVC-2870 12
LEVEL DIAGRAMS (2/4)




Correctives against other
channels in VOL circuit
D/A OUT : +5dB
EXT IN : Correctives




12
AVR-2803/983/AVC-2870 13
LEVEL DIAGRAMS (3/4)




COMPOSIT IN




13
AVR-2803/983/AVC-2870 14
LEVEL DIAGRAMS (4/4)




14
AVR-2803/983/AVC-2870 15
CLOCK FLOW & WAVE FORM IN DIGITAL BLOCK


Wave form




CH1: D-DATA
(IC513 (5) )




CH1: DATA




CH2: fs




CH3: 64fs




CH1: DATA




CH2: fs




CH3: 64fs




CH4: 256fs




15
AVR-2803/983/AVC-2870 16




16
AVR-2803/983/AVC-2870 17




) : IC No.




100 81

1 80




TOP VIEW




30 51

31 50
































17
AVR-2803/983/AVC-2870 18