Saturday, January 16, 2016

DENON AVR AVR-1706 - AVR-686 - AVR-1506 -AVR-486 – Video Level adjustment – Idle current adjustment - Initialization – AV Receiver repair and service - Manual Service

                                                Category: AV receiver Repair and service 

Contents of this article 
  • Factory reset 
  • Video Level adjustment 
  • Idle current adjustment 

DENON AVR AVR-1706 - AVR-686 - AVR-1506 -AVR-486


Initializing AV SURROUND RECEIVER
AV SURROUND RECEIVER initialization should be performed when the µcom, peripheral parts of µcom, and Digital P.W.B. are replaced.
1. Switch off the unit.
2. Hold the following SPEAKERS-A button and SPEAKERS-B button, and switch on the unit.

3. Check that the entire display is flashing with an interval of about 1 second, and release your fingers from the 2 buttons and the microprocessor will be initialized.
Video Section (For AVR-1706/686 U.S.A., Canada)
Component Video Level Adjustment

Required measurement equipment etc.: Oscilloscope, DVD VIDEO PLAYER (ex: DVD-1500)
Test disc: DVD T-S01
1. Preparation
(1) Avoid direct blow from an air conditioner or an electric fan, and adjust the unit at normal room temperature 15 °C
~ 30 °C (59 °F ~ 86 °F).
(2) Playback the color-bar 75% of the Test Disc (Title 12) using the DVD Video Player, and check that Y and C levels of the S terminal output are within the specified output levels.
If they are out of the specified levels, adjust with the variable resister inside of the unit.
(3) Presetting
# POWER (Power source switch) OFF
# SPEAKER (Speaker terminal) No load
(Do not connect speaker, dummy resistor, etc.)
# DVD (Video terminal) No input
2. Adjustment
(1) Remove top cover and set VR601, VR602, VR603, on CS VIDEO2 Unit at fully counterclockwise ( ).
(2) Connect a pin-plug terminated with 75-ohms to Y (Cb, Cr) of the Component Video Monitor Output, and hook up the Oscilloscope’s probe to both ends of the pin-plug.
(3) Connect S terminal output of the DVD Player with the DVD input terminal of the Receiver.
(4) Connect power cord to AC Line, and turn power switch
"ON".
(5) Presetting.
# FUNCTION: DVD
# Playback the color-bar 75% of the Test Disc (Title 12)
(6) Turn VR601 clockwise ( ) to adjust the COMPONENT Video Y voltage (except H. Sync) to 714 ± 50 mVp-p.
(7) Adjust the Variable Resistors of Cr: VR602 and Cb: VR603 in the same way. Cb,Cr: 486 ± 50 mVp-p. (U.S.A. & Canada model)
Idling Current
Required measurement equipment: DC Voltmeter
1. Preparation
(1) Avoid direct blow from an air conditioner or an electric fan, and adjust the unit at normal room temperature 15 °C ~ 30 °C (59 °F ~ 86 °F).
(2) Presetting
# POWER (Power source switch) OFF
# SPEAKER (Speaker terminal) No load
(Do not connect speaker, dummy resistor, etc.)
2. Adjustment
(1) Remove top cover and set VR101, VR102, VR103, VR104, VR105, on Amp. Unit, VR107SBL,107SBR on SURR.-BACK ch Amp. Unit at fully counterclockwise
( ) position.
(2) Connect DC Voltmeter to test points (FRONT-Lch:
TP104, FRONT-Rch: TP105, CENTER ch: TP103, SURROUND-Lch: TP101, SURROUND-Rch: TP102, SURROUND-BACK Lch: TP106, SURROUND-BACK Rch: TP107).
(3) Connect power cord to AC Line, and turn power switch
"ON".
(4) Presetting.
MASTER VOLUME : "---" counterclockwise ( min.)
MODE : 7CH STEREO
FUNCTION : CD
(5) Within 2 minutes after the power on, turn VR101 clockwise  to adjust the TEST POINT voltage to 1.5 mV ± 0.5 mV DC.
(6) After 10 minutes from the preset above, turn VR101 to set the voltage to 2.0 mV ± 0.5 mV DC.
(7) Adjust the Variable Resistors of other channels in the same way.