Video System Adjustments; Rf Block Adjustments; Recording Current Adjustment (Rj-74 Board); Pll Fo Adjustment (Rj-74 Board) - Sony DCR-TRV7 Service Manual

3-4. VIDEO SYSTEM ADJUSTMENTS

3-4-1. RF Block Adjustments

1. Recording Current Adjustment (RJ-74 Board)

Mode VTR stop
ODDch adjustment
CH1: Pin 6 of CN2708 (CL2719)
CH2: Pin 5 of CN2708 (CL2718)
Measurement Point
EVENch adjustment
CH1: Pin 9 of CN2708 (CL2722)
CH2: Pin 8 of CN2708 (CL2721)
Oscilloscope
Measuring Instrument ADD mode
CH2 INV mode
Adjustment Page C
Adjustment Address 3E, 3F
Specified Value A = 3.1 ± 0.1 Vp-p
Connection: Disconnect CN2708 and connect as follows.
1) ODDch adjustment: Connect a 180 Ω resistor between Pin 6
of CN2708 (CL2719) and Pin 5 of CN2708 (CL2718).
2) EVENch adjustment: Connect a 180 Ω resistor between Pin 9
of CN2708 (CL2722) and Pin 8 of CN2708 (CL2721).
180 Ω resistor (Parts code: 1-249-408-11)
Adjusting method:
1) Equalize the vertical range of CH1 and CH2 of the oscilloscope.
2) Set the oscilloscope to the ADD mode, and set CH2 to the INV
mode.
3) Set data: 01 to page: 0, address: 01.
4) Set data: 0C to page: 3, address: 01, and press the PAUSE button
of the adjusting remote commander.
5) Set data: 01 to page: 3, address: 34.
6) Change the data of page: C, address: 3F (ODDch adjustment) or
address: 3E (EVENch adjustment), and adjust the signal voltage
(A) to the specified value, press the PAUSE button on the
adjustment remote commander.
7) Set data: 04 to page: 3, address: 34.
8) Set data: 00 to page: 3, address: 01, and press the PAUSE button
of the adjusting remote commander.
9) Set data: 00 to page: 0, address: 01.
0.1 µsec
Fig. 5-3-5.

2. PLL fo Adjustment (RJ-74 Board)

Mode
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
1) Set data: 01 to page: 0, address: 01.
2) Set data: 05 to page: 3, address: 01, and press the PAUSE button
of the adjusting remote commander.
3) Set data: 04 to page: 3, address: 36.
4) Check that the average value D
3, address: 04 is "FD" to "FF" or "00" to "03". If outside this
range, change the data of page: C, address: 3C, and check again.
[If D is "80" to "FC"]
04
Decrease the data of page: C, address: 3C. (As the data is to be
rewritten, press the PAUSE button of the adjusting remote
commander.)
[If D is "04" to "7F"]
04
Increase the data of page: C, address: 3C. (As the data is to be
rewritten, press the PAUSE button of the adjusting remote
commander.)
5) Set data: 05 to page: 3, address: 36.
6) Check that the average value D
3, address: 04 is "FD" to "FF" or "00" to "03" . If outside this
range, change the data of page: C, address: 3D, and check again.
[If D is "80" to "FC"]
04
Decrease the data of page: C, address: 3D. (As the data is to be
rewritten, press the PAUSE button of the adjusting remote
commander.)
[If D is "04" to "7F"]
04
Increase the data of page: C, address: 3D. (As the data is to be
rewritten, press the PAUSE button of the adjusting remote
commander.)
7) Set data: 00 to page: 3, address: 01, and press the PAUSE button
of the adjusting remote commander.
8) Set data: 02 to page: 3, address: 36.
9) Set data: 00 to page: 0, address: 01.
A
5–46
VTR stop
Display data of page: 3, address: 04
C
3D, 3C
Displayed data is "FD" to "FF",
"oo" to "03".
("FF", "00" are center values)
of the displayed data of page:
04
of the displayed data of page:
04