7-1
SECTION 7
ADJUSTMENTS
1
2
3
4
Mode
SP
SP
EP
EP
Video signal
Color bar
Monoscope
Color bar
Monoscope
Audio signal
(HiFi/Normal)
400 Hz
Time
Seven minutes
Three minutes
Seven minutes
Three minutes
7-1. MECHANICAL ADJUSTMENTS
Refer to the SERVICE MANUAL of VHS MECHANICAL
ADJUSTMENT VI.
7-2. ELECTRICAL ADJUSTMENTS
2-1. PRE-ADJUSTMENT PREPARATIONS
Necessary items and indications for total adjustment of electric circuit
of this machine will be described in this chapter.
2-1-1. Instruments to be Used
1) Color TV
2) Oscilloscope 1 or 2 phenomena, band more than 30 MHz, delay
mode, as provided.
3) NTSC pattern generator
4) PAL pattern generator
5) Digital voltmeter
6) Audio level meter
7) Audio noise meter
8) Audio generator
9) Attenuator
10) Alignment tape
Part Code: 8-192-605-36 KRV-51P (PAL)
Part Code: 8-192-605-32 KRV-51N2 (NTSC)
2-1-2. Connection
Unless otherwise specified, connect and adjust the measuring
instruments as shown in the following diagram.
Fig. 7-2-1
During the adjustment, see the Parts Arrangement
Diagram for Adjustments on Page 7-6.
Fig. 7-2-2
2-1-4. Alignment Tapes
[Alignment Tape (KRV-51N2/KRV-51P)]
2-1-3. Set-up of Adjustment
In this adjustment, PAL or NTSC pattern generator is connected with
LINE input signal terminal. When checking with tuner, connected
AERIAL terminal. Check that the amplitudes of video signal SYNC
signal, of picture portions, and of burst signals are flat at approximately
0.3, 0.7 and 0.3 V, respectively, and that the level ratio of the burst
signal and “red” signal are 0.30: 0.66. Fig. 7-2-2. shows video signals
(color bars) used in adjusting the video section.
PAL
2-1-5. Specified I/O Level and Impedance
Input/output terminal
Video inputs LINE IN : phono jack
1 Vp-p, 75 Ω , unbalanced, sync negative
Audio inputs LINE IN : phono jacks
47 kW, –7.5 dBs (0 dBs = 0.775 Vrms)
More than 10 kW, –4 dBs
Video outputs LINE OUT : phono jack
1 Vp-p, 75 Ω , unbalanced, sync negative
Audio outputs LINE OUT : phono jacks
–7.5 dBs at load impedance 47 kΩ
Output impedance : less than 10 Ω
SLV-LF1
Video output
(75 Ω)
Pattern generator VCR
VIDEO LINE IN
Monitor TV
VIDEO LINE OUT
NTSC
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