DCR-TRV890E, DCR-TRV900, DCR-TRV900E - Sony Movie Service Manual (repair manual). Page 125

5-22

H

A

GND level
(0Vdc)

1

3

5

7

9

11

13

15

17

19

LANC SIG

EVF BL –

EVF VCO

PD VG

H START

PANEL COM

TCK

TDO

SWP

GND

2

4

6

8

10

12

14

16

18

20

EVF BL +

EVF VG

GND

PD VCO

XHD/PSIG

TMS

TDI

GND

RF IN/LANC JACK IN

RF MON

The back light (fluorescent tube) is driven by a high voltage AC
power supply. Therefore, do not touch the back light holder to
avoid electrical shock.

When replacing the LCD unit, be careful to prevent damages
caused by static electricity.

Set the VF BRIGHT (Menu display) to the center.

Most of the measuring points for adjusting the viewfinder system
are concentrated in CN2904 of the VI-151 board.
Connect the Measuring Instruments via the CPC-8 jig (J-6082-388-
A).
The following table shows the Pin No. and signal name of CN2904.

Table 5-1-3.

Set the VCO free-run frequency. If deviated, the EVF screen will be
blurred.

Mode

VTR stop

Signal

Arbitrary

Measurement Point

Pin 5 of CN2904 (EVF VCO) on
VI-151 board

Measuring Instrument

Oscilloscope (DC range)

Adjustment Page

D

Adjustment Address

75

Specified Value

A = 1.7 ± 0.2V

Adjusting method:
1)

Select page: 0, address: 01, and set data: 01.

2)

Check the GND level of the oscilloscope.

3)

Select page: D, address: 75, change the data and set the VCO
output voltage (A) to the specified value.

4)

Press the PAUSE button of the adjustment remote commander.

5)

Select page: 0, address: 01, and set data: 00.

Fig. 5-1-16

Fig. 5-1-17

CN2904

1

19

2

20

Remove the CPC cover