Marantz PM6006 - Adjustment Procedure

ADJUSTMENT
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) OFF
 •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V6001(V6002)oftheMAINPCBcounterclockwise(
c
)asfaraspos-
sible.
(2) ConnecttheDCVoltmetertothetestpoints.
 Lch   :N6003+side1pin,-side3pin
 Rch   :N6004+side1pin,-side3pin
(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.)
(5) After2minutes,rotateV6001(V6002)clockwise(
x
)toadjustthetestpointvoltageto"
10 mV(22.5
mA) ± 0.5 mV(1.1 mA)
".
(6) 6minutesafterthepreliminaryadjustment,turnV6001(V6002)andsetthevoltageto"
20 mV(45
mA) ± 0.5 mV(1.1 mA)
".
(7) Removetheconnectioncable,thenattachthetopcover.
NOTE:Theidlingcurrentreducesinaccordancewiththetemperatureincreaseinsidetheset,and
reachesthesetvalueof"
20mV (45mA)
"30minutesafterturningonthepower.
AdjustingProcedure
(1) ConnectSPEAKERSSYSTEMA(LCH)"
+
"terminaland"
-
"terminaltotheDCVoltmeterbeforeturn-
ingthepowerON.
  ConnectSPEAKERSSYSTEMA(RCH)"
+
"terminaland"
-
"terminaltotheDCVoltmeter.
(2) SetthevolumetoMIN.
(3) Turnthepoweron,thensettheSPEAKERSA/BbuttontoSPEAKERA.
  Startadjustmentafterthespeakerrelayisturnedon.
(4) AdjusttheLCHrst.
  Turnthesemi-xedresistor"
V6003
"usinganadjustmentscrewdriver,andadjustsothattheDC
Voltmetervoltageis"
0 mV ± 3 mV
".
(5) Next,adjusttheRCH.
  Turnthesemi-xedresistor"
V6004
"usinganadjustmentscrewdriver,andadjustsothattheDC
Voltmetervoltageis"
0 mV ± 3 mV
".
NOTE
:
Turnthesemi-xedresistor(
V6003
,
V6004
)clockwisetoreducetheDCoffsetvoltage.Turnthe
semi-xedresistorcounter-clockwisetoincreasetheDCoffsetvoltage.Turnthesemi-xedresis-
torslowlybecausetheDCVoltmetervaluechangesslowly.
(6) TheDCoffsetvoltagechangesslightlyafteradjustment,butcheckthattheDCoffsetvoltagebe-
tweenSPEAKERSSYSTEMALch(Rch)"
+
"terminalandLch(Rch)"
-
"terminaliswithintherangeof
"
0 mV ± 10 mV
".


Digital Voltmeter Digital Voltmeter
R ch
V
L ch
V
V6002
V6001
N6003
N6004
V6004V6003
MAIN PCB
1.AdjustingIdlingCurrent 2.DCOffsetVoltageAdjustment
35
Caution in
servicing
Electrical Mechanical Repair Information Updating