Ntsc Subcarrier Check; Pal Subcarrier Check; Com Voltage/Position Adjustment; Video Adjustment - Sony XVM-B62 Service Manual

5-8. NTSC SUBCARRIER CHECK

1. Subcarrier Check
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 ± 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
[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 ± 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
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
0V
Adjusting location: Main board

5-11. VIDEO ADJUSTMENT

Conditions: TEST MODE (See 8 page)

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
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
using the [INPUT/+] and [DIMMER/--] buttons.
Specified value: 1.05 ± 0.15 V
Adjustment location: Main board
C
A

5-11-3. White Limiter Level Adjustment

B
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
10-step gray scale signal input
NTSC mode
A
B
C
XVM-B62
0V
0V
0V
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