Mechanical Adjustments; Electrical Adjustments; Preparation Before Adjustment; Equipment Required - Sony SLV-789HF Service Manual

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) Remote commander
6) Digital voltmeter
7) Audio generator
8) Audio level meter
9) Audio attenuator
10) Alignment tapes
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.
VIDEO LINE IN
Pattern generator
Video output
(75 Ω )
Fig. 6-2-1
SECTION 6
ADJUSTMENTS
VCR Monitor TV
VIDEO LINE OUT
2-1-3.

Set-up of Adjustment

In this adjustment, NTSC pattern generator is connected with LINE
input terminal. When check to tuner, connected VHF/UHF 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.
NTSC model
About 0.7 V
About
0.3 V
Horizontal sync signal
Fig. 6-2-2 Color Bar Signals of Pattern Generator
2-1-4.

Alignment Tape

• Contents of KRV-51N2
Mode Period
1 7 minutes
SP
2 3 minutes
3 7 minutes
LP
4 3 minutes
6-1
SLV-789HF/792HF/799HF
White (100%)
About
0.3 V
Red
Burst signal
(It must be flat.)
Audio signal
Video signal
Hi-Fi Normal
Color bar
Monoscope 400Hz
400Hz
Color bar (L/R)
Monoscope