Wednesday, February 03, 2016

DENON AVR-1909 - AVR-789 - AVC-1909 - Factory reset - Micom version check - error check - Idle current adjustment - AV Receiver Repair and service

                                                 Category: AV Receiver Repair and Service 

Contents of this article 
  • Factory Reset Procedure 
  • Idle current Adjustment
  • Error checking procedure 

DENON AVR-1909 - AVR-789 - AVC-1909

Initializing AV SURROUND RECEIVER/AMPLIFIER
AV SURROUND RECEIVER/AMPLIFIER initialization should be performed when the µcom, peripheral parts of µcom, and Digital P.W.B. are replaced.
1. Switch off the unit.
2. With the "INPUTMODE" and "SPEAKERS" buttons pressed, press the "ON/OFF" button to turn the power on.
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.
Note: If step 3 does not work, start over from step 1.
# All user settings will be lost and this factory setting will be recovered when this initialization mode.
So make sure to m+emorize your setting for restoring after the initialization.
JIG to use for servicing
When you repair the printing board, you can use the following
JIG (Extension cable kit). Please order to Denon Official Service Distributor in your region if necessary.
00D SPK- 561 EXTENSION UNIT KIT : 1 Set
00D SPK- 562 9120 CONN. JOINT KIT : 1 Set
When you update the firmware, you can use the following
JIG (RS232C to internal connector conversion adapter with
8P cable kit ). Please order to Denon Official Service Distributor in your region if necessary.
Check mode for Micom/DSP version
Micom/DSP Version Display Mode
1. Operation specifications
µcom/DSP version display mode:
When started up, the version information is displayed.
Starting up:
# E3, EA, JP model
With the "DYN VOL" and "VIDEO SELECT" buttons pressed, press the "ON/OFF" button to turn the power on. Now, press the "STATUS" button to the display the 2nd item information on the FL Display.
# E2 model
With the "DYN VOL" and "RDS" buttons pressed, press the "ON/OFF" button to turn the power on. Now, press the "STATUS" button to the display the 2nd item information on the FL Display.
2. Display Order
Destination information > Main-µcom version information >  DSP version information
PROCEDURE FOR CHECKING ERRORS
Displaying the protection history
1. Operation specifications
ERROR MODE(displaying the protection history)
When started up, the error information is displayed.
Starting up:
With the "MENU" and "MULTEQ" buttons pressed, press the "ON/OFF" button to turn the power on. The error (protection history display) mode is set. Now, press the "STATUS" button to turn on the FL display.
2. About the display on the FL display
When the "STATUS" button is pressed after setting the error (protection history display) mode, a history like the one shown below is displayed, depending on the conditions.
(1) Normally (when there has been no protection incident
(2) For ASO/DC (when the last protection incident was ASO or DC protection)
(3) For THERMAL (when the last protection incident was THERMALprotection)
When the "STATUS" button is pressed again after the above protection history is displayed, the normal display reappears.
3. Clearing the protection history
There are two ways to clear the protection history, as described below.
(1) Start up the error (protection display) mode, display the error, then press and hold in the "ENTER" button for 3 seconds.
Press and hold in the "ENTER" button for 3 seconds
The protection history is cleared.
2) Initialize.
# If you want to save a backup, use the method in 3.(1) above.
Warning indication by the STANDBY LED
If the power is turned off when a protection incident has been detected, the STANDBY LED (red) flashes as follows as warning according to the conditions in which the protection incident occurred.
(1) ASO/DC PROTECTION : Flashes in cycles of 0.5 seconds (0.25 seconds lit, 0.25 seconds off)
(2) THERMAL PROTECTION : Flashes in cycles of 2 seconds (1 second lit, 1 second off)
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 FL, FR, C, SL, SR, on Main Amp. Unit, VR401, VR402 on 2ch- Amp. Unit at fully counterclockwise position.
(2) Connect DC Voltmeter to test points (FRONT-Lch: TP101, FRONT-Rch: TP105, CENTER ch: TP103, SURROUND-Lch: TP102, SURROUND-Rch: TP104, SURROUND-BACK Lch: TP401, SURROUND-BACK Rch: TP402).
(3) Connect power cord to AC Line, and turn power switch "ON".
(4) Presetting.
MASTER VOLUME : "---" counterclockwise (c min.)
SPEAKER (Speaker terminal) : No load
(Do not connect speaker, dummy resistor, etc.) MODE : 7CH STEREO (5CH 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