(2) Linearity adjustment (Guide roller S, T adjustment)
1) Playback the Mono Scope alignment tape (SP mode).
2) Observe the video envelope signal on an oscilloscope (triggered by the video switching pulse).
3) Make sure the video envelope waveform (at its minimum) meets the specification shown in Fig. 2-16.
If it does not, adjust as follows :
Note :
a=Maximum output of the video RF envelope.
b=Minimum output of the video RF envelope at the entrance side.
c=Minimum output of the video RF envelope at the center point.
d=Maximum output of the video RF envelope at the exit side.
4) If the section A in Fig. 2-17 does not meet the specification, adjust the guide roller S up or down.
5) If the section B in Fig. 2-17 does not meet the specification, adjust the guide roller T up or down.
Fig. 2-16 Envelope Waveform Adjustment
a
a b c d
c,b,d/a 63%
b
c
d
Fig. 2-17 Adjustment Points
A
B
A
B
H'D SWITCHING PULSE
ENVELOPE
Alignment and Adjustments
2-13
Samsung Electronics
Summary of Contents for CHT-350
Page 48: ...4 14 Samsung Electronics Electrical Parts List MEMO ...
Page 50: ...Block Diagram 5 2 Samsung Electronics MEMO ...
Page 53: ...Schematic Diagrams Samsung Electronics 6 3 6 1 S M P S 1 ...
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Page 55: ...Schematic Diagrams Samsung Electronics 6 5 6 3 Function Timer ...
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Page 57: ...Schematic Diagrams Samsung Electronics 6 7 6 5 Power Drive ...
Page 58: ...Schematic Diagrams 6 8 Samsung Electronics 6 6 Logic ...
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Page 62: ...Schematic Diagrams 6 12 Samsung Electronics 6 10 TM ...
Page 63: ...Schematic Diagrams Samsung Electronics 6 13 AM FM 6 11 AM FM Receiver ...
Page 65: ...Schematic Diagrams Samsung Electronics 6 15 Repair Zoran Program Board 6 13 DVD Micom ...
Page 66: ...Schematic Diagrams 6 16 Samsung Electronics 6 14 DVD AV Decoder ...
Page 67: ...Schematic Diagrams Samsung Electronics 6 17 6 15 DVD Servo ...
Page 68: ...Schematic Diagrams 6 18 Samsung Electronics 6 16 DVD Audio Video Interface ...
Page 69: ...Schematic Diagrams Samsung Electronics 6 19 6 17 Digital Amp ...
Page 70: ...Schematic Diagrams 6 20 Samsung Electronics MEMO ...
