Refer To; The - Sony GV-8E Service Manual

SECTION 7
MECHANICAL ADJUSTMENTS
FOR MECHANICAL ADJUSTMENTS
Refer to mechanical adjustment manual " U
MECHANISM" for the adjustments and checks of
mechanism section and the mechanical parts
replacement.
SECTION 8
ELECTRICAL ADJUSTMENT
Refer to the adjuatment -related parta location
diagram on page 172.
The following measuring devices are used for
electrical adjustment.
[Required equipment]
1) TV Monitor
2) Dual-trace oscilloscope with delay mode for
frequencies up to 10 MHz or over (use a 10: 1
probe unless otherwise specified)
3) Frequency counter
4) Pattern generator with video output terminal
5) Digital voltmeter
6) Audio generator
7) Audio level meter
8) Audio distortion meter
9) Audio attenuator
10) Regulated power supply
11) Alignment tapes
For tracking adjustment (WR5-1C)
Part code : 8-967-995-06
For video frequency characteristic adjustment
(WR5-2C)
Part code : 8-967 -995-16
For operation check
(WR5-3CL)
Part code : 8-967-995-36
(WR5-3CSP)
Part code : 8-967-995-27
[Connection•]
Connect measuring devices as shown below unless
otherwise specified.
•INPUT SELECT switch .... .. LINE position
Pattern generator
Video output (75 C)
VIDEO IN
Regulated DC BA TT
terminal
power supply ter&}inal
D
6.0
±
o.os
Vdc [];----::::
8
- -11,-,
BA TT
terminal T • !lted
unit
Fig. 8-1 .
[Setup for adjuatment]
D
TV monitor
terminal
The video signal from the pattern generator is used
as adjustment signal, so it must
be
within
specifications. Connect the oscilloscope to J701 on the
JK-34 board (VIDEO IN) and confirm that amplitude
of the video signal sync component is approx. 0.3V,
amplitude of the video component approx. 0. 7V, and
amplitude of the burst component approx. 0.3V with
a flat shape. Also confirm that the ratio between
burst and red levels is 0.30 : 0.66.
The video (color bar) signal used for electrical
adjustment is shown in Fig. 8-2.
Approx.
0.7V
Approx.
0.3V
White (approx.
100
% )
Horizontal SYNC signal
Fig. 8-2.
Burst signal
(To be
flat)
TApprox.
j_
0.3V
- 149 -