2-2. Preparation for Adjustment
2-3. Power Supply Voltage Adjustment
2-2. Preparation for Adjustment2-3. Power Supply Voltage Adjustment
1. Extend the DAC-38 board with a extension board.Measuring equipment: Digital voltmeter
2. Write down the customer settings of the switch (S3) on
the DAC-38 board in following table.1. Set the digital voltmeter as follows:
3. Set the switch S3 as follows:Range: AUTO
Mode: DC V
Ref. No. (Address)Setting at adj.Customer setting
S3 (F-1)No. 1:OFF OFF+++++5 V adjustment for Analog line
No. 2:OFF OFF2. Connect the probe of the digital voltmeter as follows:
No. 3:OFF+: TP1/DAC-38 (G-2)
No. 4:OFF_: E7/DAC-38 (C-2)
3. Adjust the voltage on the digital voltmeter.
4. Install the main board (ADC-40 board) of the audioAdjustment point:1RV1/DAC-38 (G-2)
A/D converter board (BKPF-L751Os audio input/Specification: ?0.05 V dc4.75
output gain in a factory default condition) to the
+++++5 V adjustment for Digital line
interface unit.
4. Connect the probe of the digital voltmeter as follows:
Factory default condition (RV405, 406, 407, 408/
+: TP2/DAC-38 (F-2)
ADC-40 board):
_: E2/DAC-38 (F-2)
Each VR was completed the adjustment so as to
5. Adjust the voltage.
convert a +4.0 dBm to _20 dB FS.
Adjustment point:1RV2/DAC-38 (F-2)
5. Install the connector panel of the audio A/D converter
Specification: ?0.05 V dc4.75
board (BKPF-L751) to the interface unit after setting
the LOOP/WORD switch to WORD CLK OUT (upper
?12 V adjustment
position).
6. Connect the probe of the digital voltmeter as follows:
6. Turn on the power of equipment, and warm up them
+: TP3/DAC-38 (D-3)
for about ten minutes.
_: TP4/DAC-38 (D-3)
7. Adjust the voltage.
Adjustment point:1RV3/DAC-38 (E-2)
D3Specification:+25.10 ?0.05 V dc
D814E4
D8158. Connect the probe of the digital voltmeter as follows:
RV101+: TP3/DAC-38 (D-3)
RV201
E7_: E7/DAC-38 (C-2)
RV301
TP49. Check the voltage.
RV401
Specification:+12.55 ?0.15 V dc
TP3
10. Connect the probe of the digital voltmeter as follows:
+: E7/DAC-38 (C-2)
_: TP4/DAC-38 (D-3)
11. Check the voltage.
Specification:_12.55 ?0.15 V dc
E3
ON
n
E6S3E2
1234E1After adjusting the power supply voltage, be sure to
perform O2-4. Input/Output Gain Adjustment�.
1RV3TP2 TP1
11
RV2RV1
E8
DAC-38 Board (Side A)
2-2 (E)BKPF-L752 |
ACEC
