Lcd System Adjustments; Vco Adjustment (Pd-125 Board) - Sony DSR-50P Service Manual

3-5. LCD SYSTEM ADJUSTMENTS

Note 1: The back light (fluorescent tube) is driven by high voltage
AC power supply. Therefore, do not touch the back light
holder to avoid electrical shock.
Note 2: When replacing the LCD unit, be careful to prevent
damages caused by static electricity.
Note 3: Adjust the LCD BRIGHT and LCD COLOR to the center
on menu display.
[Adjusting connector]
Most of the measuring points for adjusting the LCD are
concentrated in the CN505 of FR-157 board.
The following table shows the Pin No. and signal name of the
CN505.
Pin No.
1 VCO_CENT
2 PSIG
3 GND
4 COM
5 VG
CN505
5 1
FR-157 board
Fig. 5-3-48
Signal Name
5-86

1. VCO Adjustment (PD-125 Board)

Mode E-E
Signal Arbitrary
Measurement Point Pin 1 of CN505 on FR-157 board
(VCO CENT)
Measuring Instrument Oscilloscope (DC range)
Adjustment Page E
Adjustment Address 84
Specified Value A = 1.8 ± 0.1 V
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Check that the GND level of oscilloscope.
3) Select page: E, address: 84, change the data and adjust the
voltage (A) of the VCO output to the specified value.
4) Press the PAUSE button of the adjustment remote commander.
5) Select page: 0, address: 01, and set data: 00.
A
Fig. 5-3-49
GND level
(0 Vdc)