Sony XVM-B62 Service Manual ▷ View online
9
XVM-B62
5-3. SETUP FOR ADJUSTMENT
The 10-step gray scale signal from the NTSC pattern generator is
used as an adjustment signal for V COM voltage/position adjustment
as well as VIDEO adjustment.
used as an adjustment signal for V COM voltage/position adjustment
as well as VIDEO adjustment.
10-step gray scale signal, 1Vp-p, 75
Ω
The all white 50%, all white 30% signal from the NTSC pattern
generator is used as an adjustment signal for flicker and white
balance adjustment.
generator is used as an adjustment signal for flicker and white
balance adjustment.
All white 50% and All white 30% signal, 75
Ω
SECTION 5
ELECTRICAL ADJUSTMENTS
5-1. EQUIPMENT USED
The following measuring equipment are used for these electrical
adjustments:
• Oscilloscope
• NTSC pattern generator
• Stabilized power supply
• Digital voltmeter
• Frequency counter
• LCD flicker checker
• LCD color analyzer
adjustments:
• Oscilloscope
• NTSC pattern generator
• Stabilized power supply
• Digital voltmeter
• Frequency counter
• LCD flicker checker
• LCD color analyzer
5-2. CONNECTION OF EQUIPMENT
Unless otherwise specified, the equipment should be connected as
shown below.
shown below.
VIDEO OUT
(75 Ω)
NTSC pattern
generator
main board
TP410(+)
TP411(–)
TP410(+)
TP411(–)
TP413
TP415
TP414
TP415
TP414
XVM-B62
stabilized
power supply
14.4 V
power supply
14.4 V
+
–
H
1Vp-p
0.286Vp-p
0.643
Vp-p
Vp-p
All white 50%
All white 30%
0.5
Vp-p
Vp-p
0.286Vp-p
H
10
XVM-B62
5-4. DC-DC CONVERTER ADJUSTMENT
5-4-1. Frequency Adjustment
Adjustment Method:
1) Connect frequency counter between TP702 (+) and TP704 (–).
2) Adjust RV702 so that the reading on the counter stands at the
Adjustment Method:
1) Connect frequency counter between TP702 (+) and TP704 (–).
2) Adjust RV702 so that the reading on the counter stands at the
specified value.
Specified value: 243
± 3 kHz
Adjustment location: Main board
5-4-2. 5V Voltage Adjustment
Adjustment Method:
1) Connect digital voltmeter between TP707 (+) and TP710 (–).
2) Adjust RV701 so that the reading on the voltmeter stands at the
Adjustment Method:
1) Connect digital voltmeter between TP707 (+) and TP710 (–).
2) Adjust RV701 so that the reading on the voltmeter stands at the
specified value.
Specified value: 5.05
± 0.03 V
Adjustment location: Main board
5-4-3. Other Voltage Checks
Checking Method:
1) Connect digital voltmeter between TP708 (+) (Vdd) and
Checking Method:
1) Connect digital voltmeter between TP708 (+) (Vdd) and
TP710 (–).
2) Verify that the reading on the voltmeter is at 3.20
± 0.2 V.
3) Connect digital voltmeter between TP706 (+) (Vgh) and
TP710 (–).
4) Verify that the reading on the voltmeter is at 7.3
± 0.3 V.
5) Connect digital voltmeter between TP705 (+) (Vgh) and
TP710 (–).
6) Verify that the reading on the voltmeter is at 17.0
± 1.5 V.
7) Connect digital voltmeter between TP709 (+) (Vss) and
TP710 (–).
8) Verify that the reading on the voltmeter is at –12.0
± 1.5 V.
Checking location: Main board
5-5. PLL ADJUSTMENT
5-5-1. Frequency Adjustment
Adjustment Method:
1) Connect digital voltmeter between TP807 (+) and TP808 (–).
2) Adjust RV802 so that the reading on the counter stands at the
Adjustment Method:
1) Connect digital voltmeter between TP807 (+) and TP808 (–).
2) Adjust RV802 so that the reading on the counter stands at the
specified value.
Specified value: –2.2
± 0.15 V
Adjustment location: Main board
5-6. INVERTER HIGH VOLTAGE CHECK
Condition: DIMMER switch OFF
5-6-1. Voltage Check
Checking Method:
1) Connect oscilloscope between TP606 (+) and TP605 (–).
2) Verify that the reading on the oscilloscope is at 2.4
Checking Method:
1) Connect oscilloscope between TP606 (+) and TP605 (–).
2) Verify that the reading on the oscilloscope is at 2.4
± 0.15 Vp-p.
Checking location: Main board
5-6-2. Frequency Check
Checking Method:
1) Connect oscilloscope between TP606 (+) and TP605 (–) using
Checking Method:
1) Connect oscilloscope between TP606 (+) and TP605 (–) using
high voltage proof probes.
2) Verify that the reading on the oscilloscope is at 49
± 2.5 kHz.
Checking location: Main board
5-7. OSD DOT CLOCK CHECK
1. Dot Clock Check
Checking Method:
1) Connect frequency counter between TP565 (+) and TP564 (–).
2) Verify that the reading on the counter is at 6.5
Checking Method:
1) Connect frequency counter between TP565 (+) and TP564 (–).
2) Verify that the reading on the counter is at 6.5
± 0.2 MHz.
Checking location: Main board
11
XVM-B62
5-11. VIDEO ADJUSTMENT
Conditions: TEST MODE (See 8 page)
10-step gray scale signal input
NTSC mode
NTSC mode
5-11-1. Brightness Signal Contrast Level (Y GAIN)
Adjustment Method:
1) Select Y Gain from the FOR FACTORY MODE.
2) Connect oscilloscope between TP721 (+) and TP723 (–).
3) Adjust so that the signal level A stands at the specified value
Adjustment Method:
1) Select Y Gain from the FOR FACTORY MODE.
2) Connect oscilloscope between TP721 (+) and TP723 (–).
3) Adjust so that the signal level A stands at the specified value
using the [INPUT/+] and [DIMMER/--] buttons.
Specified value: 3.8
± 0.1 V
Adjustment location: Main board
5-11-2. Black Limiter Level Adjustment
Adjustment Method:
1) Select Black Limit from the FOR FACTORY MODE.
2) Connect oscilloscope between TP721 (+) and TP723 (–).
3) Adjust so that the signal level B stands at the specified value
Adjustment Method:
1) Select Black Limit from the FOR FACTORY MODE.
2) Connect oscilloscope between TP721 (+) and TP723 (–).
3) Adjust so that the signal level B stands at the specified value
using the [INPUT/+] and [DIMMER/--] buttons.
Specified value: 1.05
± 0.15 V
Adjustment location: Main board
5-11-3. White Limiter Level Adjustment
Adjustment Method:
1) Select White Limit from the FOR FACTORY MODE.
2) Connect oscilloscope between TP721 (+) and TP723 (–).
3) Adjust so that the signal level C stands at the specified value
Adjustment Method:
1) Select White Limit from the FOR FACTORY MODE.
2) Connect oscilloscope between TP721 (+) and TP723 (–).
3) Adjust so that the signal level C stands at the specified value
using the [INPUT/+] and [DIMMER/--] buttons.
Specified value: 3.95
± 0.15 V
Adjustment location: Main board
5-8. NTSC SUBCARRIER CHECK
1. Subcarrier Check
Checking Method:
1) Press the [POWER] button and enter the NTSC mode using the
Checking Method:
1) Press the [POWER] button and enter the NTSC mode using the
[INPUT/+] and [DIMMER/--] buttons.
2) Connect frequency counter between TP503 (+) and TP502 (–).
3) Verify that the reading on the counter is at 3.579545 MHz
3) Verify that the reading on the counter is at 3.579545 MHz
± 100
Hz.
Checking location: Main board
5-9. PAL SUBCARRIER CHECK
1. Subcarrier Check
Checking Method:
1) Press the [POWER] button and enter the PAL mode using the
Checking Method:
1) Press the [POWER] button and enter the PAL mode using the
[INPUT/+] and [DIMMER/--] buttons.
2) Connect frequency counter between TP503 (+) and TP502 (–).
3) Verify that the reading on the counter is at 4.433619 MHz
3) Verify that the reading on the counter is at 4.433619 MHz
± 100
Hz.
Checking location: Main board
5-10. V COM VOLTAGE/POSITION ADJUSTMENT
Condition: TEST MODE (See 8 page)
1. Voltage Setup Adjustment
Adjustment method:
1) Select Com Gain from the FOR FACTORY MODE.
2) Connect oscilloscope between TP725 (+) and TP654 (–).
3) Adjust so that the p-p value A of the waveform stands at the
Adjustment method:
1) Select Com Gain from the FOR FACTORY MODE.
2) Connect oscilloscope between TP725 (+) and TP654 (–).
3) Adjust so that the p-p value A of the waveform stands at the
specified value using the [INPUT/+] and [DIMMER/--] buttons.
4) Adjust so that the level B on the negative side stands at the
specified value using RV652.
5) Verify that the level C on the positive side stands at the specified
value.
Specified value A: 6.0
± 0.1 Vp-p
Specified value B: –1.4
± 0.1 V
Specified value C: 4.6
± 0.1 V
Adjusting location: Main board
C
B
0V
A
A
0V
B
0V
C
0V
12
XVM-B62
5-11-4. Rch Sub Bright Adjustment
Adjustment Method:
1) Select R-Sub BRT from the FOR FACTORY MODE.
2) Connect oscilloscope between TP722 (+) and TP723 (–).
3) Adjust so that the signal level D stands at the specified value
Adjustment Method:
1) Select R-Sub BRT from the FOR FACTORY MODE.
2) Connect oscilloscope between TP722 (+) and TP723 (–).
3) Adjust so that the signal level D stands at the specified value
using the [INPUT/+] and [DIMMER/--] buttons.
Specified value: 1.05
± 0.15 V
Adjustment location: Main board
5-11-5. Bch Sub Bright Adjustment
Adjustment Method:
1) Select B-Sub BRT from the FOR FACTORY MODE.
2) Connect oscilloscope between TP720 (+) and TP723 (–).
3) Adjust so that the signal level E stands at the specified value
Adjustment Method:
1) Select B-Sub BRT from the FOR FACTORY MODE.
2) Connect oscilloscope between TP720 (+) and TP723 (–).
3) Adjust so that the signal level E stands at the specified value
using the [INPUT/+] and [DIMMER/--] buttons.
Specified value: 1.05
± 0.15 V
Adjustment location: Main board
5-11-6. Rch Sub Contrast Adjustment
Adjustment Method:
1) Select R-Sub CONT from the FOR FACTORY MODE.
2) Connect oscilloscope between TP722 (+) and TP723 (–).
3) Adjust so that the signal level F stands at the specified value
Adjustment Method:
1) Select R-Sub CONT from the FOR FACTORY MODE.
2) Connect oscilloscope between TP722 (+) and TP723 (–).
3) Adjust so that the signal level F stands at the specified value
using the [INPUT/+] and [DIMMER/--] buttons.
Specified value: 3.8
± 0.1 V
Adjustment location: Main board
5-11-7. B Sub Contrast Adjustment
Adjustment Method:
1) Select B-Sub CONT from the FOR FACTORY MODE.
2) Connect oscilloscope between TP720 (+) and TP723 (–).
3) Adjust so that the signal level G stands at the specified value
Adjustment Method:
1) Select B-Sub CONT from the FOR FACTORY MODE.
2) Connect oscilloscope between TP720 (+) and TP723 (–).
3) Adjust so that the signal level G stands at the specified value
using the [INPUT/+] and [DIMMER/--] buttons.
Specified value: 3.8
± 0.1 V
Adjustment location: Main board
5-11-8. γ 1 Adjustment
Adjustment Method:
1) Select Gamma1 from the FOR FACTORY MODE.
2) Connect oscilloscope between TP721 (+) and TP723 (–).
3) Adjust so that the signal level H stands at the specified value
Adjustment Method:
1) Select Gamma1 from the FOR FACTORY MODE.
2) Connect oscilloscope between TP721 (+) and TP723 (–).
3) Adjust so that the signal level H stands at the specified value
using the [INPUT/+] and [DIMMER/--] buttons.
Specified value: 2.15
± 0.1 V
Adjustment location: Main board
5-11-9. γ 2 Adjustment
Adjustment Method:
1) Select Gamma2 from the FOR FACTORY MODE.
2) Connect oscilloscope between TP721 (+) and TP723 (–).
3) Adjust so that the signal level I stands at the specified value
Adjustment Method:
1) Select Gamma2 from the FOR FACTORY MODE.
2) Connect oscilloscope between TP721 (+) and TP723 (–).
3) Adjust so that the signal level I stands at the specified value
using the [INPUT/+] and [DIMMER/--] buttons.
Specified value: 3.6
± 0.15 V
Adjustment location: Main board
D
0V
E
0V
F
0V
G
0V
H
0V
I
0V
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