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5. SMPTE SUB COLOR Adjustment
1. Input a component color bar (R-Y, Y, B-Y). (SMPTE level
signal).
From the menu, make the Component Level N10/SMPTE.
Connect the oscilloscope probe to 1C404 Pin 30 or TP402.
Put the unit into service mode.
In the same
manner
as in 4-5, adjust [SUB CHROMA
N10/SMPTE].
AME
Pe
td
6. BURST GATE PULSE WIDTH Adjustment
1.
Input an NTSC color bar.
2. Connect the oscilloscope probes to TP301 (COMP-SYNC)
and Q363 or IC305 Pin 1. (Be careful!
IC305 Pin 1 is a
high-impedance line.)
3. Put the unit into service mode.
4. Adjust}BGP WIDTH]
so that the output waveform has the
relationship shown in Fig. 11.
hes
T
1C305 Pin 1
i
waveform
T=7.8+0.2uS
TP301
waveform
Fig. 11
7. VXO Adjustment
1. X'tal 358
1) Input an NTSC color bar.
2) Connect the frequency counter to [C305 Pin 21.
3) Put the unit into service mode.
4) Connect the circuit on the below to IC305 Pin 1.
5) Adjust [CRYSTAL 358] so that the counter reading meets the
standard below.
(You can also just adjust for where the color
flicker stops.)
X'tal 358
Standard level
12V
3579545 + 20Hz
18K
TO 1C305 1PIN
Example : 188133
(For connecting to Pin 1, have the four diodes as close to Pin
1 as possible to reduce the length of the wires.)
2. X'tal 443
1)
Input a 443 NTSC color bar.
2) Connect the frequency counter to 1C305 Pin 21.
3) Put the unit into service mode.
4)
Connect to 1C305 Pin | in the same manner as in 1-4).
5) Adjust Crystal 443 in the same manner as in 1-5).
X'tal 443
Standard level
4433619 + 20Hz
8. NTSC COLOR DEMODULATION Adjustment
1. NTSC PHASE
1) Input NTSC color bar signal.
2) Connect the oscilloscope probe to TP306.
3) Set to service mode.
4) Adjust [NTSC PHASE]
so that the output waveform burst
section becomes a straight line. (Fig. 12)
Make this flat.
Fig. 12
2. NT358 B-Y PHASE
The phase adjustment must be carried out before
the chroma
adjustment.
1) Input an NTSC color bar.
(Input only the R-Y component. Have B-Y and Y off.)
2) Connect the oscilloscope probe to TP305.
3) Put the unit into service mode.
4) Adjust [B-Y PHASE NTSC 358]so that the color components
form a straight line.
3. NT358 CHROMA (NORMAL)
1) Input an NTSC color bar.
2) Connect the oscilloscope probe to 1C404 Pin 30 or TP402.
3) Put the unit into service mode.
4) Using |NTSC CHROMA NORMAL),
adjust so that the tops
of the waveform line up as in the diagram below, (Fig. 13)
1C404 30 pin
eee |e evener s
10mV max.
vo
Fig. 13
Adjust so that the levels of the first peak and the fiurth peak are
the same.
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