JVC JY-VS200U Service Manual page 25

3.3 MONITOR ADJUSTMENT
Notes : Unless otherwise specified, all measurement points
and adjustment parts are located on MONITOR
board.
3.3.1 PLL (MONI)
•
Subject Camera picture
•
Gray scale
•
Mode EE
•
Equipment Oscilloscope
•
Measurement point IC7301 pin 24 (RPD) or TL7301 (RPD)
•
Adjustment part R7321 (PLL MONI)
•
Specification A = B
1) Observe waveform at pin 24 of the IC7301 or TP7301
(RPD).
2) For the wavefor shown in the waveform chart (Fig. 3-3-
1), equalize the width of A and B with each other by ad-
justing R7321.
a
a
< magnification>
A = B
A B
Fig. 3-3-1 PLL (MONI)
MONITOR PWB
Fig. 3-3-2 MONITOR board (COMPONENT SIDE)
3-3
H. rate
IC7401
R7421
PLL(VF)
54 37
R7321
55 36
PLL(MONI)
TL7401(PRD)
IC7301
72 19
1 8
TL7302
24
(PRD)
TL7301
(PRD)
3.4 ELECTRONIC VIEWFINDER (E.VF) ADJUSTMENT
Notes : Unless otherwise specified, all measurement points
and adjustment parts are located on MONITOR
board.
3.4.1 PLL (VF)
•
Subject Camera picture
•
Gray scale
•
Mode EE
•
Equipment Oscilloscope
•
Measurement point IC7401 pin 24 (RPD) or TL7401 (RPD)
•
Adjustment part R7421 (PLL VF)
•
Specification A = B
1) Observe waveform at pin 24 of the IC7401 or TL7401
(RPD).
2) For the wavefor shown in the waveform chart (Fig. 3-4-
1), equalize the width of A and B with each other by ad-
justing R7421.
a
a
< magnification>
A = B
A B
Fig. 3-4-1 PLL (VF)
MONITOR PWB
Fig. 3-4-2 MONITOR board (COMPONENT SIDE)
H. rate
72 55
1 54
IC7401
18 37
19 36
24
(PRD)
R7421
PLL(VF)
R7321
PLL(MONI)
TL7401(PRD)
IC7301
TL7302
TL7301
(PRD)