Sony DSR-20MD, Service Manual

Page: 162 / 225

5-70
Adjusting method:
1) Record color bar signal for two minutes on any tape.
2) Select page: 0, address: 01, and set data: 01.
3) Write the following data in page: C, addresses: 4B and 5A.
To write the data, press the PAUSE button of the adjusting
remote commander each time data is set.
Page: C, address: 4B, data: 80
Page: C, address: 5A, data: 00
4) Playback the part recorded with the color bar signal.
5) Select page: C, address: 46, set data: 80, and press the PAUSE
button of the adjusting remote commander.
6) Select page: C, address: 46, set the data to “60”, and check
that the pulse is not set at the audio area head of the ERRP
waveform’s ODDch of the oscilloscope (CH1).
7) Select page: C, address: 46, set the data to “A0”, and check
that the pulse is not set at the audio area head of the C1ERP
waveform’s ODDch of the oscilloscope (CH1).
After confirming steps 6) and 7), select page: C, address: 46,
set data: 80 again and proceed to step 12).
8) If the pulse is set in steps 6) and 7), select page: C, address:
46, increase the data from “80”, and read the data D
1
when the
pulse is set at the audio area head of CH1.
9) Select page: C, address: 46, decrease the data from “80”, and
read the data D
2
when the pulse is set at the audio area head of
CH1.
10) Obtain the average value of D
1
and D
2
, and take it as D
3
.
11) Select page: C, address: 46, set data: D
3
, and press the PAUSE
button of the adjusting remote commander.
12) Select page: C, address: 4B, set data: 00, and press the PAUSE
button of the adjusting remote commander.
13) Select page: C, address: 5A, set data: 8C, and press the PAUSE
button of the adjusting remote commander.
14) Select page: 0, address: 01, and set data: 00.
6. PLL Capture Range Adjustment (RP-228 Board)
Mode Recording/Playback
Signal Color bar
Measurement Point
CH1: Pin
qk
of CN775 (C1ERP)
CH2: Pin
6
of CN775 (JSWP)
Measuring Instrument
Oscilloscope
Trigger source: CH2
Adjustment Page C
Adjustment Address 46
7. IC774 41.85 MHz VCO Check (RP-228 Board)
Mode E-E
Signal Arbitrary
Measurement Point
Page: 3, address: 39 on displayed data of
Measuring Instrument
adjusting remote commander
Adjustment Value “37” to “C9” (0.6 to 2.2 Vdc)
Checking method:
1) Select page: 3, address: 39, and check that the displayed data
is “37” to “C9”.
CH1
CH2
ODD ch
3.33 msec
CH2
CH1
When the pulse is set at the audio area head.
When the pulse is not set at the audio area head.
Fig. 5-3-8.