Sony GV-D1000E - Digital Video Cassette Recorder, Руководство по обслуживанию

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5-19
GV-D1000/D1000E
6.7 msec
PB RF signal is stable
Pin
qj
Pin
w;
Fig. 5-3-4.
4-2. AGC Center Level Adjustment (VC-275 board)
Mode Playback
Signal Recorded signal at “Preparations
before adjustments”
Measurement Point Pin
w;
of CN933 (RF MON) (Note 1)
Ext. trigger: Pin
qj
of CN933 (SWP)
Measuring Instrument Oscilloscope
Adjustment Page C
Adjustment Address 1E
Specified Value The data of page: 3, address: 03 is
“00”
Note1: Connect a 75
Ω
resistor between Pin
w;
and Pin
ql
(GND) of
CN933.
75
Ω
resistor (Parts code: 1-247-804-11)
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. 5-3-4.)
5 3 01 23 Set the data, and press PAUSE
button.
6 3 02 Check that the data is “00”.
7 3 03 Check that the data is “00”.
(Note2)
8 Perform “APC & AEQ
Adjustment”.
Note2: If the data of page: 3, address: 03 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 3)
30 The machine is defective
40 Perform re-adjustment. (Note 3)
50 The machine is defective
Note3:
If this data is displayed twice successively, the machine is defective.
4-3. APC & AEQ Adjustment (VC-275 board)
Mode Playback
Signal Recorded signal at “Preparations
before adjustments”
Measurement Point Pin
w;
of CN933 (RF MON) (Note 1)
Ext. trigger: Pin
qj
of CN933 (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”
Note1: Connect a 75
Ω
resistor between Pin
w;
and Pin
ql
(GND) of
CN933.
75
Ω
resistor (Parts code: 1-247-804-11)
Note2:
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. 5-3-5.)
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
Note4:
If this data is displayed twice successively, the machine is defective.
Fig. 5-3-5.
6.7 msec
PB RF signal is stable
Pin
qj
Pin
w;