Sony DSR-20MD, Service Manual

Page: 172 / 225

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10. REC CB Level Adjustment (VA-102 Board)
Mode E-E
Signal Color bar (VIDEO input) (Note 1)
Measurement Point Pin
8
of IC102 (CL144)
Measuring Instrument Oscilloscope
Adjustment Element RV206
Specified Value A = 1.20 ± 0.02 V
Note 1:
Set “VIDEO” mode with the INPUT SELECT button on
the front panel.
Adjusting method:
1) Set the CB signal level (A) to the specified value using RV206.
Fig. 5-3-22.
11. Encoder Freerunning Frequency Adjustment
(VA-102 Board)
Mode E-E
Signal Color bar (S VIDEO input) (Note 2)
Measurement Point TP401 (CL426)
Measuring Instrument Frequency coutner
Adjustment Element CT401
Specified Value
f = 14318182 ± 100Hz (NTSC)
f = 17734475 ± 100 Hz (PAL)
Note 1: Connect the frequency counter via high input impedance
equipment such as an oscilloscope.
Note 2: Set “S VIDEO” mode with the INPUT SELECT button
on the front panel.
Adjusting method:
1) Set the oscillation frequency (f) to the specified value using
CT401.
Measurement Point
Fig. 5-3-23.
12. Playback Y Level Check (VA-102 Board)
Mode Recording
Signal DV input (Note 1)
Measurement Point Pin
qd
of CN401 (CL436)
Measuring Instrument Oscilloscope
Specified Value
A = 0.83 ± 0.02 V (NTSC)
A = 0.825 ± 0.02 V (PAL)
Note 1:
Generate color bar signal with NTSC: DCR-VX1000/
PAL: DCR-VX1000E and enter it to the DV terminal.
(How to generate color bars: Connect the adjusting re-
mote commander to the NTSC: DCR-VX1000/PAL:
DCR-VX1000E, and set data: 09 to page: 5, address: 02.
After adjustment, be sure to return the data to "00".)
Note 2:
Perform this check after confirming that the specified
value in the following adjustment of the JC-19 board has
been satisfied.
1. Playback Y Signal Level Adjustment.
Checking method:
1) Check that the white (75%) signal level (A) is the specified
value.
Fig. 5-3-24.
A
H
4 26 IC404
IC407
CL426
TP401
A
H