Marantz PM8005 - Adjustment

ADJUSTMENT
Adjusting Procedure
Set the power voltage to rated voltage for this adjustment.
DC Offset Voltage Adjustment
1. Before turning on the power,
Insert Digital Voltage Meter between the SPEAKER SYSTEMS A (L CH)
"+"
and
"–"
.
Insert Digital Voltage Meter between the SPEAKER SYSTEMS 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
V6001
on
P1
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
V6002
on
P1
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-xed resistor (
V6001
and
V6002
) clockwise. DC offset voltage
rises when turn the semi-xed 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.
DC OFFSET(Rch)
DC OFFSET(Lch)
V6001
V6002
Digital Voltmeter
R ch
V
Digital Voltmeter
L ch
V
8U-110150-1
V6001 V6002
19