Denon AVR-X550BT - How to Update; Firmware Update

ADJUSTMENT
Adjusting Idling Current
1. Preparation
(1) PrepareaDCvoltmeter.
(2) Placetheunitundernormalusageconditions,awayfromhighlyventilatedareassuchasnexttoan
airconditioningmachineorelectricfan.
Thesetrequiresanambienttemperatureof15℃to30℃andstandardhumidity.
(3) SettingsofThisUnit
 •POWER(Powersourceswitch) STANDBY
 •SPEAKER(Speakerterminal) Noload
 (Donotconnectequipmentsuchasspeakersordummyresistors.)
2. Adjustment Procedure
(1) Removethetopcover.
(2) ConnecttheDCVoltmetertothetestpoints.
 FRONT-Lch   :CN510 
 FRONT-Rch   :CN550 
 CENTERch   :CN530 
 SURROUND-Lch  :CN520 
 SURROUND-Rch :CN540 
(3) Connectthepowercordtoanoutlet.Next,pressthepowerbuttontoturnonthepower.
(4) Setthisunitasfollows.
 MASTERVOLUME  :"---"(
c
min.):turncounterclockwisetothelowestposition.
 SPEAKER(Speakerterminal) :Noload
 (Donotconnectequipmentsuchasspeakersordummyresistors.)
 MODE     :MCHSTEREO
 FUNCTION  :CBL/SAT
(5) Wait10minutesafterturningonthepowerandcheckthatthevoltagebecomes"2.0mV ± 0.5mV
DC".
(6) Usethesamemethodtocheckthevoltageofeachchannel.
CN540CN510 CN520 CN530 CN550
F Lch
S Lch
C ch
S Rch
F Rch
DC Voltmeter
MAIN PCB
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
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