5-47
5-3. APC & AEQ Adjustment (VC-242 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 Procedure
1 Playback the recorded signal at
“Preparations before
adjustments”
2 0 01 01 Set the data.
3 3 33 08 Set the data.
4 Confirm that the playback RF
signal is stable. (Fig. 5-3-6.)
5 3 01 07 Set the data, and press PAUSE
button.
6 3 02 Check that the data changes
from “07” to “00” in about 20
seconds after pressing PAUSE
button.
7 3 03 Check that the data is “00”.
(Note3)
8 Perform “Processing after
Completing Adjustments”.
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.
5-4. Processing after Completing Adjustments
Order Page
Address
Data Procedure
1 2 30 00 Set the data.
2 3 33 00 Set the data.
3 0 01 00 Set the data.
6. PLL f
0 & LPF f0 Final Adjustment (VC-242 Board)
Mode VTR stop
Signal Arbitrary
Measurement Point Display data of page: 3, address: 03
Measuring Instrument Adjustment remote commander
Adjustment Page C
Adjustment Address 1F, 20, 22, 29
Specified Value Bit2, bit3 and bit6 are “0”
Adjusting method:
Order Page
Address
Data Procedure
1 0 01 01 Set the data.
2 3 01 30 Set the data, and press PAUSE
button.
3 3 02 Check that the data changes to
“00”.
4 3 03 Check that bit2, bit3 and bit6 of
the data are “0”. (Note)
5 0 01 00 Set the data.
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, Error contents
address: 03
bit 4 = 1 PLL f
0
even channel is defective
bit 5 = 1 PLL f
0
odd channel is defective
bit 6 = 1 LPF f
0
is defective
bit 3 = 1 PLL f
0
final adjustment is defective
bit 2 = 1 PLL f
0
final adjustment time-out
6.7 msec
PB RF signal is stable
Pin
3
Pin
2
Fig. 5-3-6.
To Next Page
Loading...
