Sony CCD-TRV65E, CCD-TRV3E, CCD-TRV15E, CCD-TRV23E, CCD-TRV35E, Руководство по обслуживанию

Страница: 133 / 188

5-47
6. RP Filter f0 Adjustment (VC-195 board)
Adjust the LPF of the playback RF amplifier.
Mode VTR stop
Signal No signal
Measurement Point Pin
9
of CN910 (RF AGC OUT)
Measuring Instrument Oscilloscope
Adjustment Page F
Adjustment Address 4E
Specified Value A = Below 10mVp-p
Connection:
1) Input a 14.2MHz, 400mVp-p CW signal to Pin
7
of CN910
(RF AGC IN).
Fig. 5-3-11.
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: 3, address: 01, set data: 35, and press the PAUSE
button of the adjusting remote commander.
3) Only for Standard8 model, select page: D, address: 15, after
memorizing the data , set the bit value of bit0 to “1”. (Refer to
“3. Bit value discrimination” of “3-1-8. Service mode”).
4) Select page: F, address: 4E, change the data and minimize the
14.2 MHz signal level (A).
5) Press the PAUSE button of the adjusting remote commander.
6) Select page: D, address: 15, and set the data memorized at step
3), and press the PAUSE button of the adjusting remote
commander..
7) Select page: 3, address: 01, set data: 00, and press the PAUSE
button of the adjusting remote commander.
8) Select page: 0, address: 01, and set data: 00.
Fig. 5-3-12.
Signal
generator
14.2MHz 400mVp-p
0.01
µ
F
0.01
µ
F
15k
Ω
1k
Ω
47
Ω
Pin 5 of CN101 of
PJ-83/84 board
Pin 7 of CN910
(RF AGC IN)
Pin 8 of CN910
(REG GND)
Transistor : General NPN transistor (2SC403. etc)
47
Ω
resistor :
1k
Ω
resistor :
15k
Ω
resistor :
0.01
µ
F capacitor :
1-249-401-11
1-249-417-11
1-249-431-11
1-101-004-00