Denon AVC-1890 User Manual

SERVICE MANUAL
MODEL AVR-2105/885
AVC-1890
AV SURROUND RECEIVER / AMPLIFIER
Tokyo, Japan
X0206V.01 DE/CDM 0407
For U.S.A., Canada, Europe, U.K.,
Asia, China,Taiwan R.O.C., Korea
& Japan model
サービスをおこなう前に、このサービスマニュアルを
必ずお読みください。本機は、火災、感電、けがなど
に対する安全性を確保するために､さまざまな配慮を
おこなっており、また法的には「電気用品安全法」に
もとづき、所定の許可を得て製造されております。
従ってサービスをおこなう際は、これらの安全性が維
持されるよう、このサービスマニュアルに記載されて
いる注意事項を必ずお守りください。
本機の仕様は性能改良のため、予告なく変更する
ことがあります。
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.
修理の際は、必ず取扱説明書を参照の上、作業を
行ってください。
本文中に使用しているイラストは、説明の都合上
現物と多少異なる場合があります。
補修用性能部品の保有期間は、製造打切後8年です。
注 意
For purposes of improvement, specifications and
design are subject to change without notice.

Denon AVC-1890 Specifications

General

Type	AV Receiver
Amplifier Type	Discrete
Number of channels	7
HDMI Outputs	1
Component Video Inputs	3
Component Video Outputs	1
Audio Formats Supported	Dolby Digital, DTS
Dolby Digital	Yes
DTS	Yes
Video Upconversion	Yes
Weight	10.1 kg
Total Harmonic Distortion	0.08%
Input Sensitivity	200 mV
Signal-to-Noise Ratio	100 dB
Power Output	130 W
Digital audio inputs	2 Optical
Surround Sound Formats	Dolby Digital, DTS
Frequency Response	10 Hz - 100 kHz
Speaker Impedance	6 ohms

Summary

Introduction and Safety Information

Important Cautions

Key cautionary notes for servicing the unit.

Service Manual Disclaimers

Notes on specification changes, illustration differences, and repair procedures.

Safety Precautions

Leakage Current Check

Procedure to check leakage current before returning unit to customer.

Important Service Precautions

Essential notes for technicians regarding safe servicing practices.

Level Diagrams

Audio Signal Level Diagrams

Diagrams illustrating signal levels across various audio channels.

Block Diagram

Servicing Precautions

Receiver Initialization Procedure

Steps for initializing the AV Surround Receiver after component replacement.

Adjustments

Audio Section Idling Current Adjustment

Procedure to set idling current for audio section channels.

Video Section Component Video Level Adjustment

Steps for adjusting component video signal levels.

Semiconductor Components

IC Pin Functions and Details

Detailed pinout and function descriptions for key integrated circuits.

Front Panel Display

Display Pin Assignment and Anode/Grid Details

Information on display pin connections and grid assignments.

Printed Wiring Boards

Main P.W.B. Unit Layouts

Component and foil side layouts for the main printed wiring board.

CPU, Front P.W.B. Unit Layouts

Component and foil side layouts for the CPU and front board.

CNT, Pre-Amp P.W.B. Unit Layouts

Component and foil side layouts for the CNT and pre-amplifier boards.

Input, Video P.W.B. Unit Layouts (USA/Canada/Japan)

Component and foil side layouts for input/video boards in specific regions.

Input, Video P.W.B. Unit Layouts (Europe/UK/Asia/China/Taiwan/Korea)

Component and foil side layouts for input/video boards in specific regions.

DSP P.W.B. Unit Layouts

Component and foil side layouts for the digital signal processing board.

Parts List Notes

Component Identification Guides

Guides for interpreting part markings for resistors and capacitors.

Packing View

Wiring Diagram

Schematic Diagram Notes

Notes for Schematic Diagrams

Important notes regarding resistance, capacitance, voltage, and circuit changes.

Schematic Diagrams (1/16)

Input B'D, Part 1

Detailed schematic for the input board, part 1.

Schematic Diagrams (3/16)

CPU Unit

Schematic diagram for the CPU unit.

Schematic Diagrams (5/16)

Main Unit

Schematic diagram of the main unit's circuitry.

Schematic Diagrams (6/16)

Pre Amp Unit / 6 Ch Input Unit

Schematic for pre-amplifier and 6-channel input units.

Schematic Diagrams (8/16)

CPU Unit

Detailed schematic of the CPU unit.

Schematic Diagrams (11/16)

Component-Video Unit

Schematic diagram for the component video unit.

Schematic Diagrams (13/16)

C-Video Unit

Schematic diagram for the C-Video unit.

Schematic Diagrams (15/16)

Component-Video Unit

Schematic diagram for the component video unit.

Schematic Diagrams (16/16)

Front Unit / Switch Unit / Head Phone Unit / Front-S-Video Unit / Optical Input Unit

Schematics for front panel, switch, headphone, S-Video, and optical input units.