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For Europe & Asia model
SERVICE MANUAL
MODEL AVR-3805
AVC-3890
AV SURROUND RECEIVER / AMPLIFIER
For purposes of improvement, specifications and
design are subject to change without notice.
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, BUNKYO-KU, TOKYO 113-0034 JAPAN
X0197V.02 DE/CDM 0403
AVR3805 / AVC-3890 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-3805 / AVC-3890 3
WIRE ARRANGEMENT
If wire bundles are untied or moved to perform adjustment or
parts replacement etc.,be sure to rearrange them neatly as
they were originally bundled or placed afterward.
Otherwise, incorrect arrangement can be a cause of noise
generation.
Wire arrangement viewed from the top
3
AVR-3805 / AVC-3890 4
-
4
AVR-3805 / AVC-3890 5
ADJUSTMENT
Audio Section
Idling Current (1U-3469-1) (1U-3469-1)
Required measurement equipment: DC Voltmeter : DC Voltmeter
Preparation
(1) Avoid direct blow from an air conditioner or an electric (1)
fan, and adjust the unit at normal room tempereture 15