Electrical Adjustments - Sony STR-DA1200ES Service Manual

ELECTRICAL ADJUSTMENTS

BIAS ALIGNMENT ADJUSTMENT
Note: Afer 10 minutes or more have passed since the power supply was
turned on, this adjustment is done.
Connection
CNP1502 (CNP1552, CNP1602, CNP1702, CNP1752, CNP1802, CNP1852) pin 1
CNP1502 (CNP1552, CNP1602, CNP1702, CNP1752, CNP1802, CNP1852) pin 2
Procedure:
1. Connect a digital voltmeter to the CNP1502 (CNP1552,
CNP1602, CNP1702, CNP1752, CNP1802, CNP1852) on the
BIAS board.
2. Press the [POWER] button to turn on the main power.
3. Adjust the RV1501 (RV1551, RV1601, RV1701, RV1751,
RV1801, RV1851) so that the digital voltmeter reading is 5 mV
to 20 mV.
Adjustment and Connection Location:
– BIAS Board (Component Side) –
CNP1702
CNP1752
2
RV1751
2 1
RV1701
OSD ADJUSTMENT
Connection
frequency counter
VIDEO board
+
TP6501 pin 2
–
1. Connect a frequency counter to the TP6501 pin 2 on the VIDEO
board.
2. Press the [POWER] button to turn on the main power.
3. Perform the MEMORY CREARING MODE.
4. Press the [MENU] button on the remote commander to display
"Lebel Setting".
5. Press the button on the remote commander to display
V v
"Video Settings" and press the button on the remote
commander.
6. Press the button on the remote commander to display
V v
"COLOR SYSTEM" and press the button on the remote
commander.
7. Press the button on the remote commander to select
V v
NTSC.
8. Adjust the CT6503 so that the frequency counter reading is
3.579545 MHz.
9. Press the button on the remote commander to select
V v
PAL.
10. Adjust the CT6504 so that the frequency counter reading is
4.433618 MHz.
STR-DA1200ES
SECTION 5
digital voltmeter
+
–
CNP1552 CNP1502 CNP1602 CNP1852
1 2 1 2 1 2 1 2 1
RV1551 RV1501 RV1601 RV1851
Adjustment and Connection Location:
– VIDEO Board (Component Side) –
CT6504 TP6501
1 4
CT6503
UP CONVERT SIGNAL LEVEL ADJUSTMENT
Enter the test mode
1. In the standby status, press the [POWER] button while pressing
the [2CH] and [TONE MODE] buttons.
2. It enters the test mode, and display as below figure.
HU[ 7]CON[ 7]COL[ 7]
1. Y Level Adjustment
Setting:
S-VIDEO board
DVD S VIDEO IN
jack
(J6902)
color pattern
generator
color bars 100%
Procedure:
1. Connect a color pattern generator to the DVD S VIDEO IN
jack (J6902) on the S-VIDEO board, and connect an
oscilloscope to the COMPONENT VIDEO MONITOR OUT
CNP1802
Y jack (J6301) on the VIDEO board.
2 1
2. Enter the test mode.
RV1801
3. Input color bars signal from the color pattern generator.
4. Adjust the [TUNING] dial so that the Vp-p value of waveform
becomes 1 Vp-p.
Y waveform:
2. Color Level Adjustment
Setting:
VIDEO board
COMPONENT VIDEO
MONITOR OUT
P /C
B
(J6301)
S-VIDEO board
DVD S VIDEO IN jack
(J6902)
color pattern
generator
color bars 100%
VIDEO board
COMPONENT VIDEO
MONITOR OUT
P /C
R
(J6301)
Procedure:
1. Connect a color pattern generator to the DVD S VIDEO IN
jack (J6902) on the S-VIDEO board, and connect an
oscilloscope to the COMPONENT VIDEO MONITOR OUT
P /C /B-Y jack and COMPONENT VIDEO MONITOR OUT
B B
P /C /R-Y jack (J6301) on the VIDEO board .
R R
21 21
2. Enter the test mode.
3. Input color bars signal from the color pattern generator.
4. Display two waveforms of C
5. Adjust the [INPUT SELECTOR] dial so that the Vp-p value of
waveforms of C
Display
C waveform:
B
VIDEO board
COMPONENT VIDEO
MONITOR OUT
Y jack
oscilloscope
C waveform:
R
(J6301) (AC range)
+
set
–
3. HUE Level Adjustment
Setting:
S-VIDEO board
DVD S VIDEO IN jack
(J6902)
color pattern
generator
color bars 100%
1 Vp-p Procedure:
1. Connect a color pattern generator to the DVD S VIDEO IN
jack (J6902) on the S-VIDEO board, and connect an
oscilloscope to the COMPONENT VIDEO MONITOR OUT
P /C /B-Y jack (J6301) on the VIDEO board.
B B
2. Enter the test mode.
3. Input color bars signal from the color pattern generator.
4. Adjust the [TONE] dial so that the waveform as bellow.
/B-Y jack
B
oscilloscope
C waveform:
B
(AC range)
+
set –
/R-Y jack
R
STR-DA1200ES
and C simultaneously.
B R
and C both may be most set to 0.7V closely.
B R
0.7 Vp-p
0.7 Vp-p
VIDEO board
COMPONENT VIDEO
MONITOR OUT
P /C /B-Y jack oscilloscope
B B
(J6301) (AC range)
+
set
–
B
A
Adjust so that the height of
A and B may be located in a line
on this line.