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3-3.
SERVO AND RF SYSTEM ADJUSTMENTS
Before perform the servo and RF system adjustments, check that
the specified value of "27 MHz/36MHz Origin Oscillation
Adjustment" and "Hi8/standard 8mm 14 MHz Origin Oscillation
Adjustment" of "3-4. VIDEO SYSTEM ADJUSTMENT" is
satisfied.
Adjusting Procedure:
1.
PLL f
& LPF f
Pre-adjustment
0
0
2.
Switching position adjustment
3.
AGC center level adjustment
4.
APC & AEQ adjustment
5.
PLL f
& LPF f
final adjustment
0
0
6.
Hi8/standard 8mm Switching Position Adjustment
7.
CAP FG Offset Adjustment
1. PLL f
& LPF f
Pre-adjustment (VC-213 board)
0
0
Mode
VTR stop
Measurement Point
Display data of page: 3, address: 03
Measuring Instrument
Adjustment remote commander
Adjustment Page
C
Adjustment Address
1F, 20, 22, 47
Specified Value
Bit values of bit 2, bit 3 and bit 6
are "0"
Adjusting method:
1)
Select page: 0, address: 01, and set data: 01.
2)
Select page: 3, address: 01, set data: 30, and press the PAUSE
button of the adjustment remote commander.
3)
Select page: 3, address: 02, and check that the data changes to
"00".
4)
Select page: 3, address: 03, and check that bit values of bit2,
bit3 and bit6 are "0".
If bit value of bit 2, bit 3 or bit 6 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,
Error contents
address: 03
bit 6 = 1
LPF f
bit 3 = 1
PLL f
bit 2 = 1
PLL f
If bit value of bit 2 or bit 3 is "1", select page: C, address: 21, set the
following data, and press the PAUSE button, and repeat steps
2) to 4).
When the data of page: C, address: 21 is "CA". CE
When the data of page: C, address: 21 is "CE". C6
When the data of page: C, address: 21 is "C6". D2
When the data of page: C, address: 21 is "D2" C2
5) Select page: 0, address: 01, and set data: 00.
adjustment is defective
0
, fine adjustment is defective
0
, fine adjustment is defective
0
Setting data
2. Switching Position Adjustment (VC-213 board)
To obtain normal playback waveform output, adjust the switching
position.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
1)
Insert the Digital8 SW/OL reference tape and enter the VTR
STOP mode.
2)
Select page: 0, address: 01, and set data: 01.
3)
Select page: 3, address: 21, and check that the data is "02".
Note: If the data of page: 3, address: 21 is other than "72", the tape
top being played. After playing the tape for 1 to 2 seconds,
perform step 4) and higher.
4)
Select page: 3, address: 01, set data: 0D, and press the PAUSE
button of the adjustment remote commander.
5)
Select page: 3, address: 02, and check that the data changes to
"00".
6)
Select page: 3, address: 03, and check that the data is "00".
Note: If bit 0 of page: 3, address: 03 data is "1", the A channel is
defective. If bit 1 is "1", the B channel is defective. Contents
of the defect is written into page: C, addresses: 10 and 12. See
the following table. (For the bit values, refer to "5-4. SERVICE
MODE", "4-3. 3. Bit value discrimination". )
7)
Select page: 0, address: 01, and set data: 00.
When the A channel is defective
Data of page: C,
address: 10
EE
E8
E7
When the B channel is defective
Data of page: C,
address: 12
E8
E7
5-51
VTR playback
Digital8 alignment tape :
SW/OL standard (WR5-2D)
Display data of page: 3, address: 03
Adjustment remote commander
C
10, 11, 12, 13
00
Contents of defect
Writing into EEPROM (IC402) is
defective
Adjustment data is out of range
No data is returned from IC104 (TRX)
Contents of defect
Adjustment data is out of range
No data is returned from IC104 (TRX)
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