SONY BKPF-L723
Manual de Servicio

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

1-3. Name and Function of Switch/Indicator/VR
8
COR1

9
THRU(0) 340 ns

1 3 5 6 7 2 4

D5 D3 RV2
FINE

S2 S3

680 ns 1020 ns RES AC

S1

RV4

GAIN

RV3

Main Board (VDA-52 Board: Side A)

Switches, shorting plug, and VRs (Factory default settings are indicated by a \ mark)
No. Ref. No. Name 9 S1 DC RESTORE Function \ RES: Under normal operation (When a SYNC TIP signal is clamped to the signal input to the VIDEO IN connector) AC: AC coupling (When a signal containing no sync signal is input to the VIDEO IN connector) Sets the delay time of an output signal for the input signal of a VIDEO IN connector by S2, S3, and COR1. The delay can be fine-adjusted in the range (a) of 0 to 15 nsec by RV2. Total delay = (Sum of S2, S3, and COR1) + a + (System delay: approx.40) [ns] 3 S2 5 S3 8 COR1 4 RV2 7 RV3 DELAY (x 15) DELAY (x 75) DELAY (x 340) DELAY (FINE) LEN \ 1: 0 ns \ 1: 0 ns \ THRU (0 ns) 2: 15 ns 2: 75 ns 3: 30 ns 3: 150 ns 340 ns 4: 45 ns 4: 225 ns 680 ns 5: 60 ns 5: 300 ns 1020 ns 6: 75 ns 6: 375 ns

\ Fully counterclockwise (0 ns) to Fully clockwise (15 ns) Adjusts the frequency characteristics of the signal output from the VIDEO OUTconnector. (Corrects the deterioration in the frequency characteristics of the video signal input to the VIDEO IN connector.) \ Fully counterclockwise Adjusts the level of the signal output from the VIDEO OUT connector in the range of approx. ± 2 dB. (Corrects the deterioration in the level of the video signal input to the VIDEO IN connector.) n At the factory-out, RV4 was adjusted to 0 dB.

6 RV4

GAIN

n
Determine the setting of rotary switches (S2 and S3) by the notch position of a shaft (indicated by the arrow in the figure below). Shaft Notch Setting 1 Setting 2 Setting 3 Setting 4 Setting 5 Setting 6

S2: 0 ns S3: 0 ns

S2: 15 ns S3: 75 ns

S2: 30 ns S3: 150 ns

S2: 45 ns S3: 225 ns

S2: 60 ns S3: 300 ns

S2: 75 ns S3: 375 ns

Indicators
No. Ref. No. Name 2 D3 VIDEO IN Color Function

Green/red Green: When an analog composite video signal is input to VIDEO IN connector Red: When no analog composite video signal is normally input to VIDEO IN connector (including the case where no signal is input) Green/red Green: A power supply of _5 V is normal Red: A power supply of _5 V is abnormal
BKPF-L723

1 D5

_5 V WARNING

1-2 (E)