Marantz NR1506 /U1B - ADJUSTMENT Procedures; Adjusting Idling Current

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℃(59°F~86°F)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andturnVR4800,VR4801,VR4802,VR4803,VR4804,VR4805,VR4806oftheAMPPCB
counterclockwise(
c
)asfaraspossible.
(2) ConnectDCVoltmetertothetestpoints.
 FRONT-Lch   :TP4800
 FRONT-Rch   :TP4802
 CENTERch   :TP4804
 SURROUND-Lch  :TP4806
 SURROUND-Rch  :TP4808
 SURROUND-BACKLch :TP4810
 SURROUND-BACKRch :TP4813
(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) TurnVR4800clockwise(
x
)andadjustthevoltageofthetestpointto"2.0mV ± 0.5mVDC."within2minutes.
(6) 10minutesafterthepreliminaryadjustment,turnVR4800andsetthevoltageto"3.0mV ± 0.5mV DC".
(7) Adjustthevariableresistanceofeachchannelusingthesamemethod.(VR48001-VR4806).
F Lch S L ch C ch S R ch F R ch S Back Lch S Back Rch
VR4803
TP4800
TP4806
VR4802
TP4804 VR4804
C
SR
SL
FL
VR4800
TP4808
TP4802
VR4801
VR4805
TP4810
VR4806
TP4813
SBR
SBL
FR
DC Voltmeter
AMP UNIT
65