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BKPF-L753A
1-4. Name and Function of Switch/Indicator/etc.
Main Board (ADA-55 Board: Side A)
Switches/shorting plugs (Factory default settings are indicated by a
\\
\\
\ mark)
No. Ref. No. Name Function
7 S1 AUDIO 1 600 Z Selects the input impedance of the signal input to the AUDIO 1 connector.
OFF: 20 kZ
\ ON: 600 Z
8 S2 AUDIO 2 600 Z Selects the input impedance of the signal input to the AUDIO 2 connector.
OFF: 20 kZ
\ ON: 600 Z
4 COR1 AUDIO 2 GAIN Selects an input/output gain of the signal input to the AUDIO 2 connector.
(Valid only when COR3 is set to ST.)
+8 dB +4 dB \0 dB _4 dB _8 dB
1 COR2 AUDIO 1 GAIN Selects an input/output gain of the signal input to the AUDIO 1 connector.
+8 dB +4 dB \0 dB _4 dB _8 dB
6 COR3 MONAURAL/STEREO Selects monaural or stereo mode of the analog audio signal input/output.
MO (Monaural): The signal input to the AUDIO 1 connector is distributed to eight outputs
\ ST (Stereo): The each signal input to the AUDIO 1 and AUDIO 2 connectors is distributed to
four outputs
Indicator
No. Ref. No. Name Color Function
3 D1 POWER Green/red Green: A power supply of ±12 V is normal
Red: A power supply of ±12 V is abnormal
Gain adjusting VR
No. Ref. No. Name Function
5 RV3 AUDIO 2 FINE VR Adjusts the gain of the signal input to AUDIO 2 connector within the ±2 dB range.
2 RV4 AUDIO 1 FINE VR Adjusts the gain of the signal input to AUDIO 1 connector within the ±2 dB range.
n
At the factory-out, the gain adjusting VRs were adjusted to 0 dB. (the standard level +4 dBm)
3
4
5
S1
S2
6
2
7 8
1
COR2
COR1
MO
RV4
RV3
D1
COR3
ST
+8
+4
0
_4
_8
+8
+4
0
_4
_8
1-4. Name and Function of Switch/Indicator/etc.