Adjustment Of Video Signals - JVC TK-C553U Service Manual

Measuring
instrument &
No. Item
Input signals

2.7 ADJUSTMENT OF VIDEO SIGNALS

1 FSC Frequency
adjustment indicator
2 FH Digital Voltmeter
adjustment
3 Y GAIN Oscilloscope
adjustment
4 ALC LEVEL Oscilloscope
Adjustment (H-rate 10 : 1) or
W, F, M grayscale
chart
Measuring point ( * )
Adjustment points ( - )
Mode
Adjustment level ( + )
* TP305 [SW]
ADJUST
- LEFT or RIGHT button
mode FSC
+ 3.579545 MHz
<U model>
+ 4.433618 MHz
<E model>
* TP301 [SW]
ADJUST
- LEFT or RIGHT button
mode FH
+ 3.5 V
* VIDEO OUT
ADJUST
75 Ω resistor
mode
Y GAIN terminated
- LEFT or RIGHT button
+ 790 mVp-p (111 IRE)
<U model>
780 mVp-p (111 %)
<E model>
* VIDEO OUT
ADJUST
75 Ω resistor
mode
ALC LEVEL terminated
- LEFT or RIGHT button
+ 714 mVp-p (100 IRE)
<U model>
700 mVp-p (100 %)
<E model>
Adjustment steps
(1) Move the ADJUST Menu cursor to "FSC".
(2) Press the "LEFT" or "RIGHT" button to ad-
just FSC to the specified value.
(1) Move the ADJUST Menu cursor to "FH".
(2) By using the left and right buttons, adjust the
voltage to 3.5V.
(1) Move the ADJUST Menu cursor to "ALC
LEVEL".
(2) Press the "LEFT" or "RIGHT" button to set
the maximum value.
(3) Move the ADJUST Menu cursor to "Y GAIN".
(4) Press the "LEFT" or "RIGHT" button to ad-
just the level to the specified value.
(1) Attach the ND50 filter over the lens.
(2) Move the ADJUST Menu cursor to the "ALC
LEVEL".
(3) Press the "LEFT" or "RIGHT" button to ad-
just the level to the specified value.
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