Marantz PM6004/N1SG Service Manual page 33

DC OFFSET VOLTAGE ADJUSTMENT
Digital Voltmeter
Adjusting Procedure
DC Offset Voltage Adjustment
(1) Before turning on the power, Insert Digital Voltage Meter between the SPEAKERS SYSTEM A (L CH) "+" and "-".
Insert Digital Voltage Meter between the SPEAKERS SYSTEM A (R CH) "+" and "-".
(2) Adjust the VOLUME to MIN.
(3) Turn on the power. Then turn the SPAKERS SW to A.
Adjustment is started immediately after a speaker relay turns on.
(4) First L CH is adjusted.
The variable resistor V6003 on 8U-110004-1 is turned with adjustment driver, and the Digital Voltage Meter is
adjusted to "0 mV ± 3 mV".
(5) Then, R CH is adjusted.
The variable resistor V6004 on 8U-110004-1 is turned with adjustment driver, and the Digital Voltage Meter is
adjusted to "0 mV ± 3 mV".
NOTE : DC offset voltage drops when turn the semi-fixed resistor (V6003 and V6004) clockwise. DC offset voltage rises
when turn the semi-fixed resistor un-clockwise. Please turn it slowly, because value of Digital Voltage Meter
changes slowly.
(6) Although after-adjustment DC offset voltage has some change, Please check that the range of DC offset voltage
between L ch (R ch) "+" and L ch (R ch) "-" terminal of SPEAKERS SYSTEM A is "0 mV ± 20 mV". CHART OF
FACTORY MODE.
V
R ch
V6003
N6003 V6001
Digital Voltmeter
V
L ch
V6004
N6004
V6002
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