SONY BKPF-L751
Service Manual

1-3. Name and Function of Switch/Indicator Switch/Indicator/etc.

1-3. Name and Function of Switch/Indicator/etc.
1 2 3 5 7 9 !0
ON

!=
VIDEO SYNG NORMAL SWAP

![ !] !\
WORD

!;

D808 D807 D809

4 6 8

ON ON

S401 RV405 S402 RV406 S403 RV407 S404 RV408

S705

S5

S1 S3 S4
NTSC PAL HD OFF ON

NORMAL HIGH

ON

Main Board (ADC-40 Board: Side A)

Switches/gain adjusting VRs (Factory default settings are indicated by a \ mark)
No. Ref. No. !] S1 Name Function

WORD SYNC SELECT Selects the output level of the regenerated-word-clock signal output to the REF VIDEO/ WORD CLOCK (OUT) connector. \ NORMAL: 1 V p-p HIGH: 2.8 V p-p (using the traditional digital audio models) 75 Z 75 Z termination ON/OFF switch for the REF VIDEO/WORD CLOCK IN connector. \ OFF: When using the loop-through connection ON: Otherwise Selects the signal method of the video reference input signal. (Valid only when S5 is set to VIDEO.) \ NTSC PAL: NTSC or PAL method HD: HD method Selects the reference signal input to the REF VIDEO/WORD CLOCK IN connector. \ VIDEO: Input the video reference (NTSC, PAL, or HD) signal WORD SYNC: Input the word-clock signal Selects each input impedance of the audio signals input to the AUDIO IN connectors. \ ON: 600 Z OFF: 20 k Z Switch the channel output to each connector of the AES/BEU OUT. \ NORMAL: CH1/2 8 No. 1, CH3/4 8 No. 2 SWAP: CH3/4 8 No. 1, CH1/2 8 No. 2 Adjusts the audio input level of the each channel within the range between _4 dB (+8 dBm input) and +14 dB (_10 dBm input). (At the factory-out, they were adjusted so as to convert an analog audio signal +4 dBm into a digital audio signal _20 dB FS.)

!; S3

!\ S4

VIDEO SELECT

![ S5

REF SELECT

4 6 8 0

S401 S402 S403 S404

CH1 600 Z CH2 600 Z CH3 600 Z CH4 600 Z CHANNEL SELECT

!= S705

5 7 9 !-

RV405 RV406 RV407 RV408

CH1 GAIN CH2 GAIN CH3 GAIN CH4 GAIN

Indicators
No. 2 Ref. No. Name D807 REF IN Color Green/red Function Green: When a reference video or word-clock signal is input to the REF VIDEO/ WORD CLOCK IN connector Red: When no signal is normally input to the REF VIDEO/WORD CLOCK IN connector (including the case where no signal is input) Green: A power of _5 V is normal Red: A power of _5 V is abnormal Indicates the setting of the LOOP/WORD switch (S1 on the CN-1857 board) of the connector panel. (Indicates the function of REF VIDEO/WORD CLOCK (OUT) connector.) On: When the LOOP/WORD switch is set to the WORD CLK OUT position (The connector function is the regenerated word-clock signal output.) Off: When it is set to the LOOP THROUGH position (The connector function is the loop-through output.)
BKPF-L751

1 3

D808 D809

_5 V WARNING Green/red WORD OUT Green

1-2 (E)