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8. EACH SETTING AND ADJUSTMENT
QQ
3 7 63 1515 0
8.1 CD ADJUSTMENT
A
DC OFFSET VOLTAGE AND IDLE CURRENT ADJUSTMENTS
[Adjustments Procedure]
(1) Fully turn the VR102 and VR202 semifixed resistors
counterclockwise (for setting the idle current to
minimum) before turning on the unit.
(2) Turn on the unit with no load and no signal input.
(3) Adjust the VR101 and VR102 semifixed resistors for DC
offset adjustment so that the DC offset voltages for
AMP+ and AMP- become 0 mV ± 20 mV.
B
(4) Adjust the VR102 and VR202 semifixed resistors for idle
current adjustment so that the voltages at the end of the
emitter resistor for AMP+ and AMP- become
11 mV ± 3 mV.
(5) Let the unit sit for 30 minutes under windless conditions.
(6) Adjust the VR102 and VR202 semifixed resistors for idle
current adjustment so that the voltages at the end of the
emitter resistor for AMP+ and AMP- become
15 mV ± 3 mV.
C
(7) Adjust the VR101 and VR102 semifixed resistors for DC
offset adjustment so that the DC offset voltages for
AMP+ and AMP- become 0 mV ± 20 mV.
TE
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[Adjustment Points]
VR201
Amp-
DC offset
adjustment
VR202
Amp-
Idle
adjustment
VOLTAGE AMP UNIT
[Measurement Points]
POWER AMP UNIT
Q Q
CN403
3
6 7
1 3
TP for Amp +
Idle current and
DC offset
measurement
When measuring the idle current
(the voltages at the end of the emitter resistor)
CN403, CN453 (3P NV pin)
1: OVLD+
2: AMP OUT+/-
3: NC
Jigs for measurement: 3P NV connector
Measurement points: Measure the voltage between pin 1
When measuring the DC offset voltage
CN403, CN453 (3P NV pin)
1: OVLD+
2: AMP OUT+/-
3: NC
Jigs for measurement: 3P NV connector
Measurement points: Measure the voltage between pin 2
u163
.
TAD-M600
3
4
2 9
9 4
2 8
VR101
Amp+
DC offset
adjustment
VR102
Amp+
Idle
adjustment
Min
Max
CN453
1 5
0 5
8
2 9
9 4
TP for Amp -
Idle current and
DC offset
measurement
and pin 2.
and GND.
m
co
4
9 9
2 8
9 9
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