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Input/Output Gain Adjustment - Sony BKPF-L752 Maintenance Manual

Audio d/a converter board
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2-4. Input/Output Gain Adjustment

The specification value described for this input/output gain
adjustment is set when the gain is 0 dB (during factory
setting). If the customized gain is other than 0 dB, increase
or decrease the specification value proportionally to the
difference of the gain.
Measuring equipment: Audio level meter
1. Set the output of the audio signal generator to
+4.0 dBm, 1 kHz.
CH1 adjustment
2. Connect the generator to the CH1 input of AUIDO IN
connector of the audio A/D converter board (BKPF-
L751).
3. Connect the AES/EBU OUT1 connector of the audio
A/D converter board (BKPF-L751) to the AES/EBU
IN1 connector.
4. Connect the audio level meter to the CH1 output of
AUDIO OUT connector.
5. Adjust the CH1 output level on the audio level meter.
Adjustment point: 1RV101/DAC-38 (A-1)
4.0 0.1 dBm (at 600 Z load)
Specification:
CH2 adjustment
6. Connect the generator to the CH2 input of AUDIO IN
connector of the audio A/D convertor board (BKPF-
L751).
7. Connect the audio level meter to the CH2 output of
AUDIO OUT connector.
8. Adjust the CH2 output level on the audio level meter.
Adjustment point: 1RV201/DAC-38 (A-2)
4.0 0.1 dBm (at 600 Z load)
Specification:
BKPF-L752
CH3 adjustment
9. Connect the generator to the CH3 input of AUDIO IN
connector of the audio A/D converter board (BKPF-
L751).
10. Connect the AES/EBU OUT2 connector of the audio
A/D converter board (BKPF-L751) to the AES/EBU
IN2 connector.
11. Connect the audio level meter to the CH3 output of
AUDIO OUT connector.
12. Adjust the CH3 output level on the audio level meter.
Adjustment point: 1RV301/DAC-38 (A-2)
Specification:
4.0 0.1 dBm (at 600 Z load)
CH4 adjustment
13. Connect the generator to the CH4 input of AUDIO IN
connector of the audio A/D converter board (BKPF-
L751).
14. Connect the audio level meter to the CH4 output of
AUDIO OUT connector.
15. Adjust the CH4 output level on the audio level meter.
Adjustment point: 1RV401/DAC-38 (A-3)
4.0 0.1 dBm (at 600 Z load)
Specification:
16. After turning off the power, reset the switch (S3) on
the DAC-38 board to the customer settings.
n
0 dBm = 0.775 V rms
2-4. Input/Output Gain Adjustment
2-3 (E)

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