Sony EVO-720P - Electrical Adjustment

SECTION 8
ELECTRICAL ADJUSTMENT
For adjustment, refer to the parts arrangement diagram
for adjustment on page 344,
Phe following measuring equipments are used for
‘lectrical adjustment :
Equipment to be used}
1) TV monitor
2) AC pack
3) Dual trace oscilloscope of over 10 MHz band
which incorpolrates delay mode (use a 10:1
probe unless otherwise specified)
4) Frequency counter
5) Pattern generator incorporates video output
terminat
6) Digital voltmeter
7) Audio generator
8) Audio level meter
9) Audio distortion meter
0) Audio attenuator
1) Alignment tapes
For tracking adjustment (WRS-1C)
Part number: 8-967-995-06
For video frequency response adjustment (WR56C)*!
Part number! 8-967-995-17
For operation check (WRS-4CL)**
Part number: 8-967-995-56
For operation check (WR5-5CSP)**
Part number: 8-967-995-47
?recautions for adjustment]
he player side must sometimes be set to recording
‘ode for adjustment, In this case, proceed as follows:
1, Connect Pin @ (LINE IN) of CNOO4 on the
DM-24 board to Pin @ (VIDEO IN) of CN103
on the HK-3 board on the player side with
a jumper, and input the external video signal.
2, Connect Pin ® (EXT/INT) of CN103 on the
HK-3 board on the player side to Pin @ (REG
5V) of CN102 with a jumper, and select the
external input signal,
fter this, press the player MB-9P board REC button
3007) and PB button (S002), and the player will
iter the recording mode,
hen performing adjustments by recording and
aying back on the same unil, use a new. tape or
te erased with an eraser.
» WRS5-2C (8-967-995-16) is also available.
', WRS-3CL (8-967-995-36) is also available.
. WR5-4CSP (8-967-995-46) is also available.
[Connections of equipment)
Unless otherwise indicated, connect measuring devices
as shown below,
Recorder
Pattern video input
Generator Main unit Monitor TV
Video output For player side adjustment
(78.2) mBlayer video output
For recorder side adjustment
«Recorder video output
For other adjustments
*sMonitor video output
Fig. 8-1.
[Setting up for adjustment]
Video signals output by an pattern generator are used as ad-
justment signals when adjusting the video section, and these
video output signals should be within the required standard,
Connect an oscilloscope to J037 on the JB-1P board. Con-
firm that the amplitudes of video signal SYNC signals, of
picture portions, and of burst signals are flat at approxi-
mately 0.3, 0.7 and 0.3 V respectively, and that the level
ratio of the burst signals and “red” signals are 0.3 : 0.66.
Fig. 8-2 shows video signals (colour bars) used in the video
section adjustments,
White (approx. 10096)
Burst signal
(To be flat)
Approx!
O7V
Approx.
Approx. 0.3V
0.3V
Horizontal SYNC signal
Fig. 8-2. Pattern generator colour bar signats
—311-