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4-5-3. Distortion Adjustment
Adjustment Procedure
. Set an analog audio measuring equipment as follows.
Adjustment mode : THD +N
Input filter :
80 kHz low-pass filter
CH-4 adjustment
1. Connect the audio signal (1 kHz, +23.0 dBm) to the
AUDIO INPUT CH-4 connector/BKMA-570 of the
port on which adjustment is going to be made.
2. Equipment : Analog audio measuring equipment
Test point : OUTPUT-1 (CH4)/BKMA-570
Adj. point : 1RV452 (B-3) /ADA-61 board
Spec. :
Minimum (0.10% or less is acceptable)
CH-3 adjustment
1. Connect the audio signal (1 kHz, +23.0 dBm) to the
AUDIO INPUT CH-3 connector/BKMA-570 of the
port on which adjustment is going to be made.
2. Equipment : Analog audio measuring equipment
Test point : OUTPUT-1 (CH3)/BKMA-570
Adj. point : 1RV402 (B-4) /ADA-61 board
Spec. :
Minimum (0.10% or less is acceptable)
CH-2 adjustment
1. Connect the audio signal (1 kHz, +23.0 dBm) to the
AUDIO INPUT CH-2 connector/BKMA-570 of the
port on which adjustment is going to be made.
2. Equipment : Analog audio measuring equipment
Test point : OUTPUT-1 (CH2)/BKMA-570
Adj. point : 1RV352 (B-4) /ADA-61 board
Spec. :
Minimum (0.10% or less is acceptable)
CH-1 adjustment
1. Connect the audio signal (1 kHz, +23.0 dBm) to the
AUDIO INPUT CH-1 connector/BKMA-570 of the
port on which adjustment is going to be made.
2. Equipment : Analog audio measuring equipment
Test point : OUTPUT-1 (CH2)/BKMA-570
Adj. point : 1RV302 (B-5) /ADA-61 board
Spec. :
Minimum (0.10% or less is acceptable)
Setting after Adjustment
Return all the switches and setup menu to the original
setting before starting the adjustment.
MAV-555A
4-5. ADA-61 Board (BKMA-513) Adjustment
A
B
1
2
3
1
RV452
1
RV402
4
1
RV352
1
RV302
5
C
D
E
F
ADA-61 board (A side)
4-11 (E)
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