Electrical Adjustments; Equipment Used; Connection Of Equipment; Adjustment - Sony XVM-H6 Service Manual

XVM-H6
When measuring, the ground should be connected to the ground (frame of 15-pin connector connected to external device) in the monitor
board unless otherwise specified.

3-1. EQUIPMENT USED

The following measuring equipment are used for these electrical adjustments:
• Oscilloscope
• NTSC pattern generator
• Stabilized power supply
• Digital voltmeter
• Frequency counter
• Connection box (XA-116)

3-2. CONNECTION OF EQUIPMENT

NTSC
pattern generator
VIDEO IN
VIDEO
3-3. 5V ADJUSTMENT
1. Display gray scale on the monitor screen.
2. Connect digital voltmeter to the C320 position of L305.
3. Adjust VR+5 so that the reading on the voltmeter stands at the specified value.
Specified value: 5.00 ± 0.05 V

3-4. FREQUENCY ADJUSTMENT

This frequency adjustment on the DC-DC converter is only performed if there is switching noise mixed on the screen.
Adjust the semi-fixed resistor VFRQ to a position in which no noise appears on the screen.

3-5. PLL FREE RUN FREQUENCY ADJUSTMENT

1. Make the input signal no signal.
2. Connect frequency counter to pin 56 of IC U2.
3. Adjust the semi-fixed resistor VFREQ until the frequency is at 15895 ± 20 Hz.
8
SECTION 3

ELECTRICAL ADJUSTMENTS

connection box
XA-116
G
N
D B+
stabilized
power supply
14.4V
monitor
XVM-H6