Sony CCD-TRV138 / CCD-TRV238E / CCD-TRV338 / CCD-TRV438E (serv.man2) Service Manual ▷ View online
6-35
CCD-TRV138/TRV238E/TRV338/TRV438E
4. REC Y Current Adjustment (VC-341 Board)
Adjust the Y FM signal recording current.
Adjust the Y FM signal recording current.
Mode
VTR recording (PLAY/EDIT mode)
Signal
No signal
Measurement Point
REC RF (Pin 7 of CN007)
Measuring Instrument
Oscilloscope
(20 MHz BW LIMIT: OFF)
(20 MHz BW LIMIT: OFF)
Adjustment Page
C
Adjustment Address
1E, 1F
Specified value
A = 235
± 5 mVp-p (NTSC)
A = 280
± 5 mVp-p (PAL)
Note 1: Check that the data of page: 0, address: 10 is “00”.
Note 2: Don’t disconnect the DC power supply of camcoder dur-
Note 2: Don’t disconnect the DC power supply of camcoder dur-
ing the following adjustments.
When the following symptom occurs, reset the data of A
page to the values note down.
1) The power is shut off so that unit can not operate.
When the following symptom occurs, reset the data of A
page to the values note down.
1) The power is shut off so that unit can not operate.
Fig. 6-3-6
A
0.18
µsec
Adjusting method:
Order Page Address Data
Procedure
1
Close the cassette compartment
without inserting cassette.
without inserting cassette.
2
Set to the VTR stop mode.
3
0
01
01
4
C
14
01
Press PAUSE button.
5
A
10
10
Press PAUSE button.
6
7
10
02
Press PAUSE button.
7
A
1A
Note down the data.
8
A
1A
Set the following data, and
press PAUSE button.
06: NTSC model
26: PAL model
press PAUSE button.
06: NTSC model
26: PAL model
9
Set to the VTR recording
mode. (Note 3)
mode. (Note 3)
10
3
92
10
11
3
01
41
Press PAUSE button.
12
C
1F
Change the data and set the
REC Y signal level (A) to the
specified value.
REC Y signal level (A) to the
specified value.
13
C
1F
Press PAUSE button.
14
C
1F
Read the data, and this data is
named D
named D
1F
.
15
C
1E
D
1F
Press PAUSE button.
16
3
01
00
Press PAUSE button.
17
3
92
00
18
Set to the VTR stop mode.
19
A
1A
Set data noted down at step 7,
and press PAUSE button.
and press PAUSE button.
20
7
10
E2
Press PAUSE button.
21
A
10
00
Press PAUSE button.
22
C
14
00
Press PAUSE button.
23
0
01
00
Note 3: Use the REC buttons of the adjustment remote com-
mander (with HOLD switch set in the OFF position).
6-36
CCD-TRV138/TRV238E/TRV338/TRV438E
5. REC C/AFM Current Adjustment
5-1. Preparations
Note 1: Check that the data of page: 0, address: 10 is “00”.
Note 1: Check that the data of page: 0, address: 10 is “00”.
Order Page Address Data
Procedure
1
Close the cassette compartment
without inserting cassette.
without inserting cassette.
2
Set to the VTR stop mode.
3
0
01
01
4
C
14
01
Press PAUSE button.
5
A
10
10
Press PAUSE button.
6
7
10
02
Press PAUSE button.
7
A
1A
Note down the data.
8
A
1A
Set the following data, and
press PAUSE button.
06: NTSC model
26: PAL model
press PAUSE button.
06: NTSC model
26: PAL model
Note 2: Don’t disconnect the DC power supply of camcoder dur-
ing the following adjustments.
When the following symptom occurs, reset the data of A
page to the values note down.
1) The power is shut off so that unit can not operate.
When the following symptom occurs, reset the data of A
page to the values note down.
1) The power is shut off so that unit can not operate.
5-2. REC C Current Check (VC-341 Board)
Check the recording current level of the REC chroma signal.
If it is too low, chroma signal noise in playback picture will be
increased. If too high, Y signal noises will increase and white
modulation noises will be produced.
Check the recording current level of the REC chroma signal.
If it is too low, chroma signal noise in playback picture will be
increased. If too high, Y signal noises will increase and white
modulation noises will be produced.
Mode
VTR recording (PLAY/EDIT mode)
Signal
No signal
Measurement Point
REC RF (Pin 7 of CN007)
Measuring Instrument
Oscilloscope
(20 MHz BW LIMIT: OFF)
(20 MHz BW LIMIT: OFF)
Specified value
A = 50.8
± 3.0 mVp-p (NTSC)
A = 54.0
± 3.0 mVp-p (PAL)
Note 1: Check that the data of page: 0, address: 10 is “00”.
Checking method:
Order Page Address Data
Procedure
1
Close the cassette compartment
without inserting cassette.
without inserting cassette.
2
Set to the VTR recording
mode. (Note 2)
mode. (Note 2)
3
0
01
01
4
3
91
30
5
3
92
20
6
C
25
Note down the data.
7
C
25
00
Press PAUSE button.
8
3
01
41
Press PAUSE button.
9
Check that the REC chroma
signal level (A) satisfies the
specified value, and note
down the signal level.
signal level (A) satisfies the
specified value, and note
down the signal level.
10
3
01
00
Press PAUSE button.
11
C
25
Set data noted down at step 6,
and press PAUSE button.
and press PAUSE button.
12
3
91
00
13
3
92
00
14
0
01
00
15
Perform “REC AFM Current
Adjustment” and “Processing
after Completed Adjustment”.
Adjustment” and “Processing
after Completed Adjustment”.
Note 2: Use the REC buttons of the adjustment remote com-
mander (with HOLD switch set in the OFF position).
Fig. 6-3-7
A
1.35
µsec
Center of the luminance line width
6-37
CCD-TRV138/TRV238E/TRV338/TRV438E
5-4. Processing after Completed Adjustment
Note: Check that the data of page: 0, address: 10 is “00”.
Note: Check that the data of page: 0, address: 10 is “00”.
Order Page Address Data
Procedure
1
Set to the VTR stop mode.
2
0
01
01
3
A
1A
Set data noted down at step 7
of “7-1. Preparations”, and
press PAUSE button.
of “7-1. Preparations”, and
press PAUSE button.
4
7
10
E2
Press PAUSE button.
5
A
10
00
Press PAUSE button.
6
C
14
00
Press PAUSE button.
7
0
01
00
5-3. REC AFM Current Adjustment (VC-341 Board)
Check the recording current level of the REC AFM signal.
If it is too low, the audio S/N will be deteriorated. If too high,
color beets will be produced on self recording/playback image.
Check the recording current level of the REC AFM signal.
If it is too low, the audio S/N will be deteriorated. If too high,
color beets will be produced on self recording/playback image.
Mode
VTR recording (PLAY/EDIT mode)
Signal
No signal
Measurement Point
REC RF (Pin 7 of CN007)
Measuring Instrument
Oscilloscope
(20 MHz BW LIMIT: OFF)
(20 MHz BW LIMIT: OFF)
Adjustment Page
C
Adjustment Address
25
Specified value
NTSC model
A = (REC chroma signal level)
A = (REC chroma signal level)
× 0.292
± 0.9 mVp-p (Note 1)
PAL model
A = (REC chroma signal level)
A = (REC chroma signal level)
× 0.309
± 0.9 mVp-p (Note 1)
Note 1: Check that the data of page: 0, address: 10 is “00”.
Note 2: REC chroma signal level is noted down at step 9 of “REC
Note 2: REC chroma signal level is noted down at step 9 of “REC
C Current Check”
Adjusting method:
Order Page Address Data
Procedure
1
Close the cassette compartment
without inserting cassette.
without inserting cassette.
2
Set to the VTR recording
mode. (Note 3)
mode. (Note 3)
3
0
01
01
4
3
92
20
5
3
01
41
Press PAUSE button.
6
C
25
Change the data and set the
REC AFM signal level (A) to
the specified value.
REC AFM signal level (A) to
the specified value.
7
C
25
Press PAUSE button.
8
3
01
00
Press PAUSE button.
9
3
92
00
10
0
01
00
11
Perform “Processing after
Completed Adjustment”.
Completed Adjustment”.
Note 3: Use the REC buttons of the adjustment remote com-
mander (with HOLD switch set in the OFF position).
Fig. 6-3-8
A
0.67
µsec
Center of the luminance line width
6-38
CCD-TRV138/TRV238E/TRV338/TRV438E
3-5.
AUDIO SYSTEM ADJUSTMENTS
Before performing the audio system adjustments, check that the
data of page: 0, address: 10 is “00”.
If not, select page: 0, address: 10, and set data “00”.
data of page: 0, address: 10 is “00”.
If not, select page: 0, address: 10, and set data “00”.
[Connecting the measuring instruments for the audio]
Connect the audio system measuring instruments in addition to
the video system measuring instruments as shown in Fig. 6-3-9.
Connect the audio system measuring instruments in addition to
the video system measuring instruments as shown in Fig. 6-3-9.
Fig. 6-3-9
Main unit
47 k
Ω
47 k
Ω: 1-249-437-11
Audio level meter
or distortion meter
TV monitor
A/V OUT
jack
Video
Audio
In Playback
1. BPF f
0
Adjustment (VC-341 Board)
Set the BPF passing frequency of IC801 so that the AFM signal
can separate from the playback RF signal properly. If deviated,
the noises and distortions will increase during high volume play-
back.
can separate from the playback RF signal properly. If deviated,
the noises and distortions will increase during high volume play-
back.
Mode
VTR playback (PLAY/EDIT mode)
Signal
Alignment tape
For BPF adjustment
(WR5-11NS (NTSC))
(WR5-11CS (PAL))
(WR5-11NS (NTSC))
(WR5-11CS (PAL))
Measurement Point
Audio terminal of A/V OUT jack
Measuring Instrument
Distortion meter
Adjustment Page
C
Adjustment Address
30
Specified value
The distortion rate should be
minimum.
minimum.
Note: Check that the data of page: 0, address: 10 is “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
C
30
Change the data and minimize
the distortion rate.
the distortion rate.
3
C
30
Press PAUSE button.
4
0
01
00
2. 1.5 MHz Deviation Adjustment (VC-341 Board)
Adjust to the optimum 1.5 MHz audio FM signal deviation.
If the adjustment is not correct, its playback level will differ from
that other units.
Adjust to the optimum 1.5 MHz audio FM signal deviation.
If the adjustment is not correct, its playback level will differ from
that other units.
Mode
VTR playback (PLAY/EDIT mode)
Signal
Alignment tape
For checking operation
(WR5-5NSP (NTSC))
(WR5-5CSP (PAL))
(WR5-5NSP (NTSC))
(WR5-5CSP (PAL))
Measurement Point
Audio terminal of A/V OUT jack
Measuring Instrument
Audio level meter
Adjustment Page
C
Adjustment Address
2F
Specified value
–7.5
± 2.0 dBs
Note 1: Check that the data of page: 0, address: 10 is “00”.
Note 2: Perform “BPF f
Note 2: Perform “BPF f
0
Adjustment” before this adjustment.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
C
2F
Change the data and set the
400 Hz audio signal level to
the specified value.
400 Hz audio signal level to
the specified value.
3
C
2F
Press PAUSE button.
4
0
01
00
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