Video System Check; Playback Level Check (Ma-388 Board); Sync Agc Check (Ma-388 Board); Audio System Adjustment - Sony SLV-SE850 Service Manual

2-5.

VIDEO SYSTEM CHECK

2-5-1.

Playback Level Check (MA-388 board)

[Adjustment purpose]
Confirm that the playback video signal level is within the
specification.
Mode Playback
Signal MOD signal (color bar)
Measurement Point CN200 qa pin (EEV PB) (Note1)
JW234 (IC661 ts pin : OSDV)
(Note2)
Measuring Instrument Oscilloscope
Specified Value A=2.1 ± 0.1Vpp
Note 1: For SLV-SE850/SF900/SF950/SF990 model. (Except B model)
Note 2: For B model.
[Check method]
1) Check that the video signal level (A) satisfies the specified
value.
H
Fig. 6-2-4.
2-5-2.

Sync AGC Check (MA-388 board)

[Adjustment purpose]
Confirm that the E-E video output level is within the specification.
Mode E-E
Signal Color bar
Measurement Point CN200 qa pin (EEV PB) (Note1)
JW234 (IC661 ts pin : OSDV)
(Note2)
Measuring Instrument Oscilloscope
Specified Value A=2.1 ± 0.1Vp-p
Note 1: For SLV-SE850/SF900/SF950/SF990 model. (Except B model)
Note 2: For B model.
Switch setting:
INPUT SELECT ........................................ L3
[Check method]
1) Input a color bar signal to VIDEO LINE 3 terminal.
2) Check that the video signal level (A) satisfies the specified
value.
H
Fig. 6-2-5.
2-6.
[Connecting Instruments]
Audio oscillator
White (100%)
2-6-1.
A

2-6-1-1. Overall Audio Output Level Check

[Adjustment purpose]
Confirm that the audio output level is within the specification.
Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Switch setting:
INPUT SELECT ................................... L1
[Check method]
1) Input a 400Hz, –7.5dBs (SF990), 400Hz, –6.3dBs signal to
both L and R channels of LINE 3 (L/R) (SF990), LINE 1
(CN500 pin 6 and 2) (SE850/SF900/SF950).
2) Check that the audio output signal satisfies the specified value.
White (100%)
A
6-4

AUDIO SYSTEM ADJUSTMENT

600 Ω
Attenuator
LINE-2 IN
AUDIO
LINE-1
AUDIO OUT
Audio level meter
or distortion meter
47 kΩ
Fig. 6-2-6.

Hi-Fi Audio System Check (MA-388 board)

Recording and playback (SP mode)
SF990 :
400Hz, –7.5dBs
SE850/SF900/SF950 :
400Hz, –6.3dBs
SF990 :
LINE3 (L/P) OUT (J500)
SE850/SF900/SF950 :
LINE1 A(L) OUT (CN500 3 pin)
or
LINE1 A(R) OUT (CN500 1 pin)
Audio level meter
SF990 :
–7.5 ± 2dBs
SE850/SF900/SF950 :
–6.3 ± 2dBs
VCR
L R
GND L R
4 3 1