Sony SLV-7700KME, Service Manual

Page: 101 / 135

7-7
2-6-4. REC Y Level Check (MA-303 Board)
Mode E-E
Signal No signal
Measurement
Q301
E
or CN301 pin
6
point
Measuring
Oscilloscope
instrument
Specified
A=400 ± 120 mVp-p
value
[Check Method]
1)
Check that the record Y level A satisfies the specified value.
2-6-5. REC Chroma Level Check (MA-303 Board)
Mode E-E
Signal Color bar
Measurement
Q314
E
point
Measuring
Oscilloscope
instrument
A=140 ± 20 mVp-p (PAL SP)
Specified A=160 ± 20 mVp-p (PAL LP)
value A=160 ± 20 mVp-p (NTSC SP)
A=200 ± 20 mVp-p (NTSC LP)
[Adjusting Method]
1)
Check that the record chroma level A satisfies the specified
value.
Fig. 7-2-15.
2-6-6. Playback Level Check (MA-303 Board)
Mode Playback
Signal Alignment tape : Color bar portion
Measurement LINE-1 OUT VIDEO terminal
point (terminated at 75
Ω
)
Measuring
Oscilloscope
instrument
Specified
A=1.0 ± 0.18 Vp-p
value
[Check Method]
1)
Check that the playback level satisfies the specified value.
Fig. 7-2-17.
2-6-7. VCO Frequency Adjustment (MA-303 Board)
[Adjustment Object]
Adjust to set the character position on the screen.
Mode E-E
Signal Color bar
Measurement
IC401 pin
@§
point
Measuring
Oscilloscope (DC mode)
instrument
Adjustment
CT401
element
Specified
A=2.80 ± 0.05 Vdc
value
Fig. 7-2-18.
Fig. 7-2-16.
A
A
H
White (100%)
A
H
H
A
VDD=5.1Vdc
GND=0V