Read Sony FDL-E22U (serv.man2) Service Manual online
– 8 –
– B BOARD – (COMPONENT SIDE)
RV402
RV301
1. Receive a *signal
2. Check and confirm waveform at *JL30 by *oscilloscope to be in
the *specification.
3. Connect oscilloscope CH1 to *JL34, then vary *RV and confirm
picture contrast of screen changes relevantly.
4. Connect oscilloscope CH2 to *JL40, then adjust amplitude of A
by *RV to be in the *specification.
5. Connect oscilloscpe CH2 to *JL40 and confirm leading edges of
C and D to be in the area of
˜ .
*JL40 (AUTO C)
JL34
(CH1)
JL40
(CH2)
0 IRE
100 IRE
C
D
*
A=1.8
A=1.8
±
0.2V
Picture contrast
is varies.
is varies.
MEASUREMENT
POSITION
ADJUSTMENT
LOCATION
ILLUSTRATION AND SHAPE
AND NUMBER
ADJUSTMENT ITEM AND PROCEDURE
EQUIPMENT
AND SIGNAL
B BOARD ADJUSTMENT
GRAY SCALE SIGNAL ADJUSTMENT
* 10-gradation
gray scale
* Oscilloscope
gray scale
* Oscilloscope
*JL30 (VIDEO)
*JL34(G)
*JL40 (AUTO C)
*RV402
*RV402
*0.62
±
0.05Vp-p (0 IRE - 100 IRE)
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