Sony RMT-V259D, Service Manual

Page: 84 / 118

6-1
SLV-SE85/SF90/SF99
SECTION 6
ADJUSTMENTS
6-1. MECHANICAL ADJUSTMENT
For the mechanical adjustments, please refer to the
“VHS MECANICAL ADJUSTMENT MANUAL
(S
MECHANISM)” (9-921-647-13)
6-2. ELECTRICAL ADJUSTMENT
2-1. PREPARATION BEFORE ADJUSTMENT
2-1-1. Equipment Required
The measuring instruments used for this alignment include:
1)
Monitor TV
2) Oscilloscope, dual-trace, bandwidth above 30 MHz with delay
mode (Unless specified otherwise, use a 10 : 1 probe.)
3) Frequency counter
4) PAL pattern generator
5) Remote commander
6) Digital voltmeter
7) Audio generator
8) Audio level meter
9) Audio attenuator
10) Alignment tape
KRV-51NP (PAL) Part No.: 8-192-955-57
2-1-2. Equipment Connection
Unless specified otherwise, connect the measuring instrument as
shown in the following diagram.
Fig. 6-2-1.
2-1-3. Setup for adjustment
Because the video signal obtained from the pattern generator is used
as the adjustment signal for adjustments, the video output signal
must satisfy the given specification.
Connect the oscilloscope to VIDEO LINE-2 IN terminal, and check
that the amplitude of sync signal is approximately 0.3V, the
amplitude of the video section is approximately 0.7V and the
amplitude of burst signal is approximately 0.3V. And check that the
level ratio of the burst signal to “red” signal is 0.30 : 0.66.
The video signal used for adjustments is shown in Fig. 6-2-2.
Fig. 6-2-2. Color Bar Signal of Pattern Generator
2-1-4. Alignment Tape
• Contents of KRV-51NP
1
2
3
4
Mode
SP
LP
Period
7 minutes
3 minutes
7 minutes
3 minutes
Video signal
Color bar
Monoscope
Color bar
Monoscope
Audio signal
Hi-Fi
400Hz
(L/R)
Normal
400Hz
LINE-2 IN
VIDEO
LINE-1
V OUT GND
Video output
(75
Ω
)
Pattern generator
VCR
!ª !¶
Monitor TV
Red
Horizontal sync signal
Burst signal
(Should be flat)
Approx.
0.3 V
White (100%)
Approx. 0.3 V
Approx. 0.7 V