Color Electronic Viewfinder System; Adjustment; Vco Adjustment (Dd-123 Board) - Sony DCR-TRV8 Service Manual

1-4. COLOR ELECTRONIC VIEWFINDER
SYSTEM ADJUSTMENT
Note 1: 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.
Note 2: When replacing the LCD unit, be careful to prevent damages
caused by static electricity.
Note 3: Set the VF BRIGHT (Menu display) to the center.
Note 4: As the PANEL CLOSE switch (FP-91 flexible board S96) is
attached to the cabinet (R), this cabinet must be attached when
performing adjustments.
[Adjusting connector]
Most of the measuring points for adjusting the viewfinder system
are concentrated in CN2904 of the VC-217 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.
Pin No. Signal Name
1 LANC SIG
3 EVF BL –
5 EVF VCO
7 PD VG
9 H START
11 PANEL COM
13 TCK
15 TDO
17 SWP
19 GND
Table 5-1-7.
CN2904
1 2
19 20
Remove the CPC cover
Fig. 5-1-13.
Pin No. Signal Name
2 EVF BL +
4 EVF VG
6 GND
8 PD VCO
10 XHD/PSIG
12 TMS
14 TDI
16 GND
18 RF IN/LANC JACK IN
20 RF MON

1. VCO Adjustment (DD-123 board)

Set the VCO free-run frequency. If deviated, the EVF screen will be
blurred.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
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.
H
5-28
VTR stop
Arbitrary
Pin 5 of CN2904 (EVF VCO) on
VC-217 board
Oscilloscope (DC range)
D
75
A = 1.7 ± 0.05V
A
GND level
(0Vdc)
Fig. 5-1-14.