Sony SLV-7700KME, Руководство по обслуживанию

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7-1
SLV-7700KME/7700KML
SECTION 7
ADJUSTMENTS
7-1. MECHANICAL ADJUSTMENTS
For the procedures how to adjust and check the mechanism, as well
as how to replace mechanical parts, refer to the VHS Mechanical
Adjustment Manual (H MECHANISM) (9-973-623-11).
However, for the procedures how to see the Track Shift mode, refer
to the following text.
7-2. ELECTRICAL ADJUSTMENTS
See the adjusting part location diagram from on page 7-12 for
the adjustment.
2-1. PREPARATION BEFORE ADJUSTMENT
2-1-1. Equipment Required
The measuring instruments used for this alignment include:
[Instruments for Use]
1)
Monitor TV
2) Oscilloscope, dual-trace, bandwidth of 30MHz or more, with
delay mode (A prove 10 : 1 should be used unless otherwise
specified.)
3) Frequency counter (8 digits or more)
4) PAL pattern generator
5) Digital voltmeter
6) Audio level meter
7) Audio generator
8) Attenuator
9) Distortion rate meter
10) Modulation Analyzer
11) Alignment tape
Part No. : H7099052H (MH-2)
12) Reference disc (YEDS-18)
Part No. : 3-702-101-01
2-1-2. Equipment Connection
Unless otherwise specified, connect and adjust the measuring
instruments as shown is the following diagram.
Unless otherwise specified, place the switches and controls of this
unit in the following positions :
•
INPUT SELECT (VHS) switch ............................................ 1
• COLOR SYSTEM switch ................................... PAL/AUTO
• TAPE SPEED switch* ...................................................... SP
* : Remote commander
2-1-3. Check of Input Signal
Because the video signal obtained from the pattern generator is used
as the adjustment signal for the adjustment, the video output signal
is required to satisfy the specified value.
Unless otherwise specified, input PAL color bar.
Connect the oscilloscope to the picture input terminal (terminal
board). And check that the synchronizing signal amplitude of the
video signal is approximately 0.3V, the amplitude of the picture
part is approximately 0.7V, the amplitude of the burst signal is
approximately 0.3V and is flat, and the ratio of level between the
burst signal and the “red” signal is 0.33 : 0.66. The video signal
(color bar) used for the adjustment is shown in the fig. 7-2-2.
Fig. 7-2-1.
Fig. 7-2-2. Color bar signal of the pattern generator
Pattern
Generator
VCR Monitor TV
Video
output
(75
Ω
)
LINE-1 IN
VIDEO
LINE-1
OUT
VIDEO
White (100%)
Red
Approx.
0.7V
Approx.
0.3V
Approx.
0.3V
Burst signel (Should be flat)
Horizontal synchronizing signal