Sony DSR-20MD, Service Manual

Page: 159 / 225

5-67
3-5. VIDEO SYSTEM ADJUSTMENTS
3-5-1. RP-228 Board Adjustments
1. Recording Current Adjustment (RP-228 Board)
Connection: Disconnect CN771 and connect as follows.
1) ODDch adjustment: Connect a 180
Ω
resistor between Pin
6
of CN771 (CL812) and Pin
5
of CN771 (CL813).
2) EVENch adjustment: Connect a 180
Ω
resistor between Pin
2 of CN771 (CL816) and Pin 3 of CN771 (CL815).
180
Ω
resistor (Parts code: 1-249-408-11)
Adjusting method:
1) Equalize the vertical range of CH1 and CH2 of the oscillo-
scope.
2) Set the oscilloscope to the ADD mode, and set CH2 to the
INV mode.
3) Select page: 0, address: 01, and set data: 01.
4) Select page: 3, address: 01, set data: 0C, and press the PAUSE
button of the adjusting remote commander.
5) Select page: 3, address: 34, and set data: 01.
6) Select page: C, address: 3F (ODDch adjustment) or 3E
(EVENch adjustment), change the data, and adjust the signal
voltage (A) to the specified value, press the PAUSE button on
the adjusting remote commander.
7) Select page: 3, address: 34, and set data: 04.
8) Select page: 3, address: 01, set data: 00, and press the PAUSE
button of the adjusting remote commander.
9) Select page: 0, address: 01, and set data: 00.
Mode E-E
ODDch adjustment
CH1: Pin
6
of CN771 (CL812)
Measurement Point
CH2: Pin 5 of CN771 (CL813)
EVENch adjustment
CH1: Pin
2 of CN771 (CL816)
CH1: Pin
3
of CN771 (CL815)
Oscilloscope
Measuring Instrument ADD mode
CH2 INV mode
Adjustment Page C
Adjustment Address 3E, 3F
Specified Value A = 4.1 ± 0.1 Vp-p
2. PLL fo Adjustment (RP-228 Board)
Mode E-E
Measurement Point Displayed data of page: 3,
Measuring Instrument address: 04
Adjustment Page C
Adjustment Address 3D, 3C
Displayed data is “FD” to “FF”,
Specified Value “00” to “03”
(“FF”, “00” are center values)
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: 3, address: 01, set data: 05, and press the PAUSE
button of the adjusting remote commander.
3) Select page: 3, address: 36, and set data: 04.
4) Select page: 3, address: 04, and check that the average value
D
04
of the displayed data is “FD” to “FF” or “00” to “03”. If
outside this range, select page: C, address: 3C, change the data,
and check again.
[If D
04
is “80” to “FC”]
Select page: C, address: 3C, and decrease the data. (As the
data is to be rewritten, press the PAUSE button of the adjust-
ing remote commander)
[If D
04
is “04” to “7F”]
Select page: C, address: 3C, and increase the data. (As the
data is to be rewritten, press the PAUSE button of the adjust-
ing remote commander)
5) Select page: 3, address: 36, and set data: 05.
6) Select page: 3, address: 04, and check that the average value
D
04
of displayed data is “FD” to “FF” or “00” to “03”. If out-
side this range, select page: C, address: 3D, change the data,
and check again.
[If D
04
is “80” to “FC”]
Select page: C, address: 3D, and decrease the data. (As the
data is to be rewritten, press the PAUSE button of the adjust-
ing remote commander)
[If D
04
is “04” to “7F”]
Select page: C, address: 3D, and increase the data. (As the
data is to be rewritten, press the PAUSE button of the adjust-
ing remote commander)
7) Select page: 3, address: 01, set data: 00, and press the PAUSE
button of the adjusting remote commander.
8) Select page: 3, address: 36, and set data: 02.
9) Select page: 0, address: 01, and set data: 00.
A
0.1
µ
sec
Fig. 5-3-5.