Sony DPA-300 Service Manual page 22

DPA-300
Q Q
3 7 6 3 1 5 1 5 0
VIDEO SECTION
[SYNC LEVEL ADJUSTMENT]
Connection:
Oscilloscope
75 Ω
+
DPA-300
–
Video Output (J106)
Adjustment Procedure:
1. Connect an oscilloscope and monitor to the Video Output (J106)
of the DPA-300.
2. Enter the video test mode. Output the color bar from the DPA-
300. (Refer to page 15.) After color bar output is confirmed,
disconnect a monitor.
3. Adjust RV3003 on the PICTURE board until the level (A)
satisfies the specification on an oscilloscope.
Waveform:
A
T E
L 1 3 9 4 2 2 9 6 5 1 3
H
Specification: 286 ± 15 mVp-p
(Measured in the 50 mV range of oscilloscope)
Adjustment Location: PICTURE board
- Reference -
Pattern of built-in color bar signal
w w w
[WHITE LEVEL ADJUSTMENT]
Connection:
Oscilloscope
75 Ω
+
DPA-300
–
Video Output (J106)
Adjustment Procedure:
1. Connect an oscilloscope and monitor to the Video Output (J106)
of the DPA-300.
2. Enter the video test mode. Output the 100 % white signal from
the DPA-300. (Refer to page 15.) After the 100 % white signal
is confirmed, disconnect a monitor.
3. Observe waveform on an oscilloscope. Adjust RV3001 on the
PICTURE board until the level (A) of the color bar's white
peak (100 %) satisfies the specification on an oscilloscope.
Waveform:
White (100 %)
A
H
Specification: 714 ± 30 mVp-p
(Measured in the 100 mV range of oscilloscope)
Adjustment Location: PICTURE board
x a o
y
. i
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8
[CLOCK ADJUSTMENT]
Connection:
Frequency counter
PICTURE board
TP4091 (DCLK) +
–
Adjustment Procedure:
1. Connect a frequency counter to TP4091 (DCLK) on the
PICTURE board.
2. Turn the POWER switch of the DPA-300 to ON.
3. Adjust CT4001 on the PICTURE board until frequency of
TP4091 (DCLK) satisfies the specification.
Specification: 12.272725 MHz ± 30 Hz
Adjustment Location: PICTURE board
[ S INPUT Y-SIGNAL AMPLITUDE ADJUSTMENT]
Connection:
Video Output (J106)
Color bar generator
75 Ω
Q Q
DPA-300
3 7 6 3
Video Output
S-Video Input
(J101)
Adjustment Procedure:
1. Connect a color bar generator to the S-Video input (J101) of the
DPA-300.
2. Connect an oscilloscope and monitor to Video Output (J106) of
the DPA-300.
3. Output the 100 % white color bar signal from a color bar
generator.
4. Set the mode in which the Through picture is displayed. (Refer
to SERVICE NOTE on page 5.) After the mode is set, disconnect
a monitor.
5. Adjust RV403 of the VIDEO-IN board until the 100 % white
level (A) satisfies the specification on an oscilloscope.
Waveform:
White (100 %)
u 1 6 3
H
Specification: 714 ± 30 mVp-p
.
Adjustment Location: VIDEO-IN board
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2 4
9 9 8
[Y OUTPUT AMPLITUDE ADJUSTMENT]
Connection:
Video Output (J106)
Color bar generator
DPA-300
Video Output
S-Video Input
(J102)
Adjustment Procedure:
1. Connect a color bar generator to the Video input (J102) of the
DPA-300.
2. Connect an oscilloscope and monitor to Video Output (J106) of
the DPA-300.
3. Output the 100 % white color bar signal from a color bar
generator.
4. Set the mode in which the Through picture is displayed. (Refer
to SERVICE NOTE on page 5.) After the mode is set, disconnect
a monitor.
5. Adjust RV402 of the VIDEO-IN board until the 100 % white
level (A) satisfies the specification on an oscilloscope.
Waveform:
Oscilloscope
White (100 %)
+
–
1 5 1 5 0 8 9 2 4
H
Specification: 714 ± 30 mVp-p
Adjustment Location: VIDEO-IN board
A
m
c o
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2
9 9
Oscilloscope
75 Ω
+
–
9 8 2 9 9
A