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Necessary items and indications for total adjustment of electric
circuit of this unit will be described in this chapter.
[ Instruments to be Used ]
1) Color TV
2) Signal or dual trace type oscilloscope, band more than
30 MHz, delay, as provided.
3) Frequency counter (4 digits or more)
4) PAL pattern generater
5) Digital voltmeter
6) Audio level meter
7) Audio generator
8) Attenuator
9) Distortion meter
10) Alignment tape
Part code : H7099052H (MH-2)
[ Connection ]
Unless otherwise specified, connect and adjust the measurement
equipment as follows.
Pattern generator
VIDEO LINE OUT (75 )
Fig. 2-1.
SECTION 2
CIRCUIT ADJUSTMENTS
[ Set-up for adjustment ]
The video signal from the pattern generator is used as adjustment
signal for electrical adjustment. This video signal should meet
the requirement. Connect the oscilloscpe to the video input
terminal on the MF 1 board and make sure that the amplitudes
of sync signal of video signal, video portion and burst signal are
flat at approximately 0.3, 0.7 and 0.3 V, respectively, and that
the level ratio of the burst signal and "red siganl" are 0.30 : 0.66,
Fig. 2-2. shows video signals (color bars) used in adjusting the
electrical adjustment.
Approx.
Approx.
0.3V
Alignment Tape (MH-2)
1
2
3
4
– 61 –
White (approx. 100%)
0.7V
Red
Horizontal sync signal
Fig. 2-2
Time
Video signal
10 minutes
Starir-step
5 minutes
–
10 minutes
Color bar
3 minutes
RF sweep
Burst signal
(To be flat)
Approx.
0.3V
Audio signal
6 kHz
3 kHz
1 kHz
–
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