Video/Reference Signal System Adjustment; 27 Mhz Vco Free-Running Adjustment; Stair Case Adjustment - Sony HXCU-TX70 Service Manual

5-3.

Video/Reference Signal System Adjustment

5-3-1.

27 MHz VCO Free-Running Adjustment

Preparation
• Disconnect the cable from the REFERENCE INPUT connector on the rear panel.
• Connect the measuring equipment as shown in the figure.
• Start this adjustment after 10 minutes have elapsed from power-on.
CH2
Probe
IN
Oscilloscope
Adjustment
Equipment: Frequency counter and oscilloscope
Test Point: TP301 (C-6) / DM-152 board
Adjusting Point: MAINTENANCE menu (M06) → 27M CLK TRIM
Tip
CCU MENU → MAINTENANCE → M06: ADC ADJUST
Specification: 27,000,000 ±50 Hz
1
2
3
4
5
6
TP301
A B C D
DM-152 board (Side A)
Setting after Adjustment
After this adjustment is completed, reconnect the disconnected cable.
5-3-2.

STAIR CASE Adjustment

Precautions
This adjustment is used tentatively when a repair is made.
This adjustment must be made again according to the waveform monitor characteristics at the system setup.
HXCU-TX70
CH2 IN
OUT
Frequency
counter
E F G
5-5