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Service Adjustments (Electronic Controls, cont.)
Sub-Brightness Final adjustment
Service DAC (B3)
Perform this adjustment at the end. After all picture
adjustments.
Preparation:
1. Turn the receiver ON and allow 20 min. warm up at
high brightness (white screen).
2. Apply a Black-White cross Pattern
3. Preset the following controls for best results:
• Picture . . . . . . Max
• Bright . . . . . . . Center
Procedure:
1. In Service mode, select Sub bright Register, B2
2. Adjust register until get the 7.5 IRE section looks
the same light output than 3 Ire section. See
Fig. 28
3 IRE
7 IRE
Figure 28. Sub-bright adjustment
3. Exit Service Mode.
Horizontal Centering
Service DAC (C9)
Preparation:
Connect a monoscope pattern.
Procedure:
1. In the Service Mode select the Horizontal
Centering Adjustment DAC (C9) and adjust until
the center of the pattern is centered on CRT.
Distance A should be same than B.
A=B
A
Figure 29. Horizontal Centering
2. Exit Service Mode.
Vertical Size
Service DAC (C6)
Preparation:
Procedure:
1. In
2. Exit the Service Mode.
MTS Circuit Adjustments
(Stereo Models only)
The MTS Circuit Adjustments require two steps:
1. Input Level Adjustment.
2. Stereo Separation Adjustment.
Input Level Adjustment (M0)
(Stereo Models only)
Preparation:
1. Connect an RMS meter with filter jig as shown in
2. Connect an RF signal generator to the RF
Procedure:
1. Apply the following signal from the RF signal
B
2. Adjust the MTS Input Level Adjustment (M0) until
- 29 -
Connect a monoscope pattern.
the
Service
Mode
Adjustment DAC (C6) and adjust until obtain a
perfect round picture.(Upper and lower section of
the pattern may go out of the visible are)
A
~ ~
A
B
B
Figure 30. Vertical Size
Fig. 31.
RMS
METER
4700p
Figure 31. Filter Jig
antenna input.
generator:
Video: 100 IRE flat field, 30% modulation.
Audio:
300Hz,
100%
(70 ±5dB, 75Ω OPEN, P/S 10dB).
the voltage measured is 106 ± 6.0mV rms.
select
Vertical
Size
TPE11
10k
modulation,
monaural
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