6-1
SECTION 6
ADJUSTMENTS
SLV-798HF/998HF
6-1 MECHANICAL ADJUSTMENTS
For the mechanical adjustments, please refer to the
“VHS MECHANICAL ADJUSTMENT MANUAL
(S MECHANISM)” (9-921-647-11).
6-2. ELECTRICAL ADJUSTMENTS
See the adjusting parts location diagram from on page 6-8
for the 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 of 30MHz or more, with
delay mode (A probe 10:1 should be used unless otherwise
specified.)
3)
Frequency counter
4)
Pattern generator
5)
Digital voltmeter
6)
Audio generator
7)
Audio level meter
8)
Audio distortion meter
9)
Audio attenuator
10) Alignment tapes
KRV-51N2
Part No.: 8-192-605-32
2-1-2. Equipment Connection
Unless otherwise specified, connect and adjust the measuring
instruments as shown in the following diagram.
2-1-3. Input Signal Check
Video signal produced by a pattern generator is used as an adjustment
signal to perform electrical alignment for this unit. This video signal
must satisfy the specification.
Unless otherwise specified, place the switches and controls of this
unit in the following positions:
•
INPUT SELECT switch ............................. LINE or LINE 1
(Remote commander)
Connect an oscilloscope to the Video Input terminal. Check that the
synchronizing signal of the Y signal has an amplitude of
approximately 0.7V and that the burst signal has an amplitude of
approximately 0.3V and its waveform is flat. And check that the
level ratio of burst signal to “red” signal is 0.30 : 0.66. The video
signal (color bar) used for electrical aligning this unit is shown in
Fig. 6-2-2.
Fig. 6-2-2. Color Bar Signals of Pattern Generator
2-1-4. Alignment Tape
• Contents of KRV-51N2
White (100%)
About 0.7 V
About
0.3 V
Horizontal sync signal
Red
Burst signal
(It must be flat.)
About
0.3 V
1
2
3
4
Mode
SP
EP
Period
7 minutes
3 minutes
7 minutes
3 minutes
Video signal
Color bar
Monoscope
Color bar
Monoscope
Audio signal
Hi-Fi
400Hz
Normal
400Hz
VIDEO LINE IN
VIDEO LINE OUT
Video output
(75
Ω
)
Pattern generator
VCR
Monitor TV
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