Adjustments; Mechanical Adjustment; Electrical Adjustment; Preparation Before Adjustment - Sony SLV-SE85 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) 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.
Pattern generator
Video output
(75 Ω )
Monitor TV
Fig. 6-2-1.
SECTION 6

ADJUSTMENTS

VCR
LINE-1
LINE-2 IN
VIDEO
V OUT GND
!ª !¶
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.
(S
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.
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-51NP
Mode Period
1 7 minutes
SP
2 3 minutes
3 7 minutes
LP
4 3 minutes
6-1
SLV-SE85/SF90/SF99
White (100%)
Red
Burst signal
(Should be flat)
Audio signal
Video signal
Hi-Fi
Color bar
Monoscope 400Hz
Color bar (L/R)
Monoscope
Approx.
0.3 V
Normal
400Hz