Sony DVMC-DA2 Service Manual page 24

4-1. PREPARATIONS BEFORE
ADJUSTMENTS
Use the following measuring instruments for video section
adjustment.
1. Equipment Required
1) TV monitor
2) Oscilloscope (dual-trace, band width of 30 MHz more with
delay mode) (Unless otherwise specified, use a 10 : 1 probe.)
3) Pattern generator with video output terminal.
4) Regulated power supply
5) Adjustment remote commander (J-6082-053-B)
SWX-22 board
SECTION 4
ADJUSTMENTS
2. Removing Cabinets and Connections
1) Remove the four screws from the bottom panel and remove
the cabinet (upper) block assembly.
2) Remove the flexible wiring board that is connected to CN701
of the IFX-52 board.
Remove the two screws (B3 × 10) from the rear panel and two
3)
screws (M2 × 6) securing the shield plate. Remove the cabinet
(lower) assembly and the shield (upper).
Remove the four screws (M2 × 5) securing the IFX-52 board,
4)
and remove the IFX-52 board.
5) Connect the measuring instruments as shown in Fig. 4-1.
3. Checking the Input Signals
The video signal that is supplied from the pattern generator is used
as the adjustment signal of the video section. Therefore, the video
output signal must satisfy the given specifications.
Connect an oscilloscope to the video terminal of the AUDIO/VIDEO
jack, and check that the sync signal amplitude of the video signal is
approximately 0.286V, the amplitude of the video section is
approximately 0.714V, the amplitude of the burst signal is
approximately 0.286V and flat, and that the "red" amplitude of the
chroma signal is approximately 0.67V.
The video signal used for adjusting the video section is shown in
Fig. 4-2.
J802
J301
IFX-52 board
CN701
CN802
Adjustment remote
commander
Fig. 4-1
4-1
Regulated power supply
LANC
J881
CN893
JK-02 board
DVMC-DA2