Apc & Aeq Adjustment (Vi-156 Board); Processing After Completing Adjustments; Pll F & Lpf F - Sony DSR-250 Service Manual

4-3. APC & AEQ Adjustment (VI-156 Board)
Mode Playback
Signal Recorded signal at "Preparations
before adjustments"
Measurement Point Pin 2 of CN007 (RF MON) (Note 1)
Ext. trigger: Pin 3 of CN007 (SWP)
Measuring Instrument Oscilloscope
Adjustment Page C
Adjustment Address 18, 19, 1B, 1C, 21, 2C
Specified Value The data of page: 3, address: 03 is
"00"
Note 1: Connect a 75Ω resistor between Pin 2 and Pin 1 (GND) of
CN007.
75Ω resistor (Parts code: 1-247-804-11)
Note 2: The "AGC Center Level Adjustment" must have already been
completed before starting this adjustment.
Adjusting method:
Order Page Address Data
1
2 0 01 01
3 3 33 08
4
5 3 01 07
6 3 02
7 3 03
8
Note3: If the data is other than "00", adjustment has errors. Take an
appropriate remedial measures according to the errors referring to
the following table.
Data Contents of defect
20 Perform re-adjustment. (Note 4)
30 The machine is defective
50 Perform re-adjustment. (Note 4)
60 The machine is defective
80 The machine is defective
Note 4: If this data is displayed twice successively, the machine is defective.

4-4. Processing after Completing Adjustments

Order Page Address Data
1 2 30 00
2 3 33 00
3 0 01 00
Procedure
Playback the recorded signal at
"Preparations before
adjustments"
Set the data.
Set the data.
Confirm that the playback RF
signal is stable. (Fig. 5-3-6.)
Set the data, and press PAUSE
button.
Check that the data changes
from "07" to "00" in about 30
seconds after pressing PAUSE
button.
Check that the data is "00".
(Note3)
Perform "Processing after
Completing Adjustments".
Procedure
Set the data.
Set the data.
Set the data.
5. PLL f & LPF f Final Adjustment (VI-156 board)
0 0
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 3 01
3 3 02
4 3 03
5 0 01
Note: If bit2, bit3 or bit 6 of the data is "1", there are errors.
For the error contents, see the following table. (For the bit values,
refer to "5-4. SERVICE MODE", "4-3. 3. Bit value discrimination".)
Bit value of page: 3,
address: 03
bit 6 = 1
bit 3 = 1
bit 2 = 1
PB RF signal is stable
Pin 2
Pin 3
5-69
VTR stop
Arbitrary
Display data of page: 3, address: 03
Adjustment remote commander
C
1F, 20, 22, 29
Bit2, bit3 and bit6 are "0"
Procedure
01 Set the data.
30 Set the data, and press PAUSE
button.
Check that the data changes to
"00".
Check that bit2, bit3 and bit6 of
the data are "00". (Note)
00 Set the data.
Error contents
LPF f is defective
0
PLL f final adjustment is defective
0
PLL f final adjustment time-out
0
6.7 msec
Fig. 5-3-6.