Mechanical Adjustment; Electrical Adjustment - Sony SLV-SE850 Service Manual

6-1. MECHANICAL ADJUSTMENT

For the mechanical adjustments, please refer to the
"VHS MECANICAL ADJUSTMENT MANUAL
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) PAL pattern generator
4) Remote commander
5) Digital voltmeter
6) Audio generator
7) Audio level meter
8) Audio attenuator
9) Audio distorsion meter
10) Alignment tape
KRV-31PS/44PS (PAL)
2-1-2. Equipment Connection
Unless specified otherwise, connect the measuring instrument as
shown in the following diagram.
Pattern generator
LINE-2 IN
Video output
(75 Ω)
VIDEO
Monitor TV
Fig. 6-2-1.
SECTION 6
ADJUSTMENTS
(S
KRV-35PF
VCR
LINE-1
V OUT GND
ql qj
SLV-SE850/SF900/SF950/SF990
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.
White (100%)
Approx. 0.7 V
Approx. 0.3 V
Horizontal sync signal
Fig. 6-2-2. Color Bar Signal of Pattern Generator
2-1-4. Alignment Tape
• Contents of KRV-31PS/44PS
Mode Period
1 7 minutes
SP
2 3 minutes
3 7 minutes
LP
4 3 minutes
6-1
Approx.
0.3 V
Red
Burst signal
(Should be flat)
Audio signal
Video signal
Hi-Fi Normal
Color bar
Monoscope 400Hz
400Hz
Color bar (L/R)
Monoscope