Luxman L-510 Service Manual

Alignment Procedure
Alignment of Mainamp. section DC Offset and Idling Current
(1)
(2)
(3)
(4)
(5)
setting. Conditions
Volume Control: minimum
Balance Control: center point
Tone Control: flat
Speaker Selector Switch: A
VR401 (DC Offset adjusting VR): center point
VR402(Idling Current adjusting VR): Turn counter clockwise to
the end.
Connect a DC voltmeter to Speaker Terminals A.
Disconnect the plated wires (jumper wires) connected to the
terminals shown on the main PCB(PB-1391-1) and connect a
DC amperemeter to the terminals for both L-CH and R-CH.
Press to switch Power Switch ON and after one minute adjust
VR402 to make the amperemeter connected in the above-mentioned
procedure No. 3 read 150mA. Then, adjust VR402 for another
channel again. But in this case, idling current for this
channel should be matched to the idling current adjusted first
with the another channel since the idling current adjusted
first must have been increased.
Remarks: This adjustment should be done when the unit is
cooled off. (Value of the primary current is 1.5 - 2.5A).
Adjust VR401 to make the DC voltmeter connected to Speaker
Terminals A in the procedure No. 2 read OV(within +50mV).
Alignment of Equalizer section DC Offset
(1)
(2)
Adjust VR102(positive) and VR103(negative) to make the DC
voltmeter connected to the test-point, TP(positive) and TP
(negative) of 3-P connector read +30V and -30V respectively.
Connect a DC voltmeter to REC-OUT and adjust VR1Ola(L-CH) and
VRLOLb(R-CH) to make the voltmeter read OV on L-Out and R-Out.
This adjustment shall be made easier by setting Cartridge Impedance
Selector between MC 40-ohm and 300-ohm and making servo time-
constant smaller with eventual connection of resistance of
1.5M+Ohm and 68K-Ohm in parallel in its circuitry.
Remarks: Note that no wind should be admitted once the inside
temperature of the unit has got stable as voltage
may fluctuate if so.
Per a

Luxman L-510 Specifications

General

Brand	Luxman
Model	L-510
Category	Amplifier
Language	English