Electrical Adjustments; Equipment Used; Connection Of Equipment; Setup For Adjustment - Sony XVM-F65WL Service Manual

XVM-F65WL

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

5-2. CONNECTION OF EQUIPMENT

Unless otherwise specified, the equipment should be connected as
shown below.
MONITOR
monitor board
XVM-F65WL TP501(+)
TP502(–)

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.
10-step gray scale signal (with burst), 1Vp-p, 75 Ω
12
SECTION 5

ELECTRICAL ADJUSTMENTS

NTSC pattern
generator
VIDEO OUT
(75 Ω)
connection box
XA-125/126
stabilized
power supply
14.4 V

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
specified value.
Specified value: 243 ± 3 kHz
Adjustment location: Monitor 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
specified value.
Specified value: 5.05 ± 0.03 V
Adjustment location: Monitor board

5-4-3. Other Voltage Checks

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: Monitor board

5-5. PLL ADJUSTMENT

1. Frequency Adjustment
Adjustment Method:
1) Connect digital voltmeter between TP651 (+) and TP652 (–).
2) Adjust RV651 so that the reading on the voltmeter stands at the
specified value.
Specified value: 2.2 ± 0.15 V
Adjustment location: Monitor board