Sony SLV-GA30, Service Manual, Page: 42 / 120

6-1
SECTION 6
ADJUSTMENTS
SLV-GA30/GA50/GA66/GA70K/GA77K/GF80/GF90K/GF99K/P66/PH99
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 part location diagram from on page 6-6
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 30 MHz or more, with
delay mode (A probe 10:1 should be used unless otherwise
specified.)
3) Frequency counter
4) NTSC Pattern generator
5) PAL Pattern generator
6) Digital voltmeter
7) Audio generator
8) Audio level meter
9) Audio attenuator
10) Alignment tapes
KRV-51P (PAL) Part No. : 8-192-605-36
KRV-51N2 (NTSC) 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.
Fig. 6-2-1
2-1-3. Set-up of Adjustment
In this adjustment, PAL or NTSC pattern generator is connected
with LINE input terminal. When check to tuner, connected AERIAL
terminal. Check that the synchronizing signal of the Y signal has
an amplitude of approximately 0.7 V and that the burst signal has
an amplitude of approximately 0.3 V 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.
PAL model
NTSC model
Fig. 6-2-2 Color Bar Signals of Pattern Generator
2-1-4. Alignment Tape
• Contents of KRV-51N2/51P
Red
Horizontal sync signal
Burst signal
(It must be flat.)
Approx.
0.3 V
White (Approx. 75%)
Approx. 0.3 V
Approx. 0.7 V
VIDEO LINE IN
VIDEO LINE OUT
Video output
(75
Ω
)
Pattern generator VCR
Monitor TV
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
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