Sony XTL-W7000, Service Manual

Page: 23 / 72

XTL-W7000
23 23
XTL-W7000
MONITOR SECTION
PRECAUTION
1. Set the test mode when performing adjustments of monitor
section. (Refer to “Section 4 TEST MODE” for the test mode)
2. Before adjustments, confirm that the voltage of each point on
the MONITOR board as following table are specified value.
Measuring point Specified value
TP201 5.03 V
±
0.05 V
TP202 15.2 V
±
0.5 V
TP203 –14.40 V
±
0.5 V
TP204 5.50 V
±
0.05 V
TP205 7.8 V
±
0.1 V
TP929 5.40 V
±
0.05 V
TP931 5.00 V
±
0.05 V
TP822 5.03 V
±
0.05 V
1. VCO ADJUSTMENT
Setting:
Procedure:
1. Input 10 steps signal (NTSC, gray scale) from VIDEO 2 input
jack.
2. Connect a frequency counter to the TP121 and TP122 (GND)
on the MONITOR board.
3. Enter the test mode.
4. Press the
[1] button on the remote commander to display
ENGINEER menu screen, and press the [4] button on the
remote commander to enter the MONITOR1 mode. (refer to
following figure)
5. Press the V / v button on the remote commander several
times to select the “VCO”.
6. Adjust the VCO value by pressing the
[VOL ---] / [VOL +]
button
on the remote commander so that the value of frequency counter
becomes 15.734 kHz
±
0.05 kHz.
7. Press the [BACK] button to save the adjusted data.
2. CONTRAST ADJUSTMENTS
Setting:
Procedure:
1. Input 10 steps signal (NTSC, gray scale) from VIDEO 2 input
jack.
2. Connect an oscilloscope to the TP926 and TP912 (GND) on
the MONITOR board.
3. Enter the MONITOR1 mode in the test mode.
4. Confirm that the waveform of oscilloscope is as following
figure.
Specified value:
BPL : 5.00 V
±
0.03 V
G1 : 2.13 V
±
0.03 V
BRT : 0.68 V
±
0.03 V
CNT : 4.83 V
±
0.03 V
5. Press the
V
/
v
button on the remote commander to select
each item, and adjust the each item values by pressing
the
[VOL ---] / [VOL +] button on the remote commander so
that the waveform of the oscilloscope becomes as above
specified values.
6. Repeat about each item until all specified value becomes
specified value.
7. Press the
[BACK]
button to save the adjusted data.
3. V-COM ADJUSTMENT
Setting:
Procedure:
1. Input 10 steps signal (NTSC, gray scale) from VIDEO 2 input
jack.
2. Connect an oscilloscope to the TP916 and TP912 (GND) on
the MONITOR board.
3. Enter the MONITOR1 mode in the test mode.
4. Confirm that the waveform of oscilloscope is as following
figure.
5. Press the
V
/
v
button on the remote commander several
times to select the “COM”.
6. Adjust the “COM” value by pressing the [VOL ---] / [VOL
+] button on the remote commander so that the value of
frequency counter becomes 5.56 V
±
0.05 V.
7. Press the
[BACK]
button to save the COM level on the
waveform adjusted data.
4. SUB CARRIER CONFIRMATION
Setting:
Procedure:
1. Input NTSC color bar signal from VIDEO 2 input jack.
2. Connect a frequency counter to the TP462 and TP122 (GND)
on the MONITOR board.
3. Confirm that the value of frequency counter is 3.579545 MHz
±
100 Hz.
4. Change the input signal to PAL color bar.
5. Confirm that the value of frequency counter is 4.433619 MHz
±
100 Hz.
Connecting Location:
MONITOR board
TP121
+
–
frequency counter
TP122 (GND)
TEST MONITOR1
BRT*** G1 *** COM*** VCO***
CNT*** G2 *** VDN*** CEN***
COL*** WPL*** SHP*** VDP***
HUE*** BPL*** YGA***
MONITOR board
TP926
TP912 (GNG)
+
–
oscilloscope
(DC range)
GND
BPL CNT G1 BRT
MONITOR board
TP916
TP912 (GNG)
+
–
oscilloscope
(DC range)
COM
MONITOR board
TP462
+
–
frequency counter
TP122 (GND)
5. NTSC FLICKER ADJUSTMENT
Procedure:
1. Input color bar signal (NTSC, all white, 40%) from the VIDEO
2 input jack.
2. Enter the MONITOR2 mode in the test mode.
3. Press the
V / v button on the remote commander several
times to select the “VDN”.
4. Adjust the “VDN” value by pressing the
[VOL ---]
/
[VOL
+]
button on the remote commander so that the flicker
becomes optimally.
5. Press the
[BACK]
button to save the adjusted data.
6. PAL FLICKER ADJUSTMENT
Procedure:
1. Input color bar signal (PAL, all white, 40%) from the VIDEO
2 input jack.
2. Enter the MONITOR2 mode in the test mode.
3. Press the
V / v button on the remote commander several
times to select the “VDP”.
4. Adjust the “VDP” value by pressing the [VOL ---] / [VOL
+]
button on the remote commander so that the flicker
becomes optimally.
5. Change the input signal to NTSC color bar.
6. Press the
[BACK]
button to save the adjusted data.
TP822
TP822
TP121
TP203
– MONITOR Board (Conductor Side) –
TP202
TP205 TP201
TP204
TP912
TP926
TP929
TP916
TP931
TP462