2-3-4
MK14NMA_PC
5. To shift the CTL waveform, press [CHANNEL
K
]
or [CHANNEL
L
] buttons on the unit. Then make
sure that the maximum output position of PB FM
envelope signal become within
±
2ms from preset
position.
6. Set the Tracking Control Circuit to the preset
position by pressing [CHANNEL
K
] button and
then [PLAY] button on the unit.
1-C. Checking/Adjustment of Envelope
Waveform
Purpose:
To achieve a satisfactory picture, adjust the
PB FM envelope becomes as flat as possible.
Symptom of Misalignment:
If the envelope output is
poor, noise will appear in the picture. The tracking will
then lose precision and the playback picture will be
distorted by any slight variation of the Tracking
Control Circuit.
1. Connect the oscilloscope to TP (C-PB) on the
Main CBA. Use TP (RF-SW) as a trigger.
2. Playback the Gray Scale on the Alignment Tape
(VFMS0001H6). Set the Tracking Control Circuit
to the preset position by pressing [CHANNEL
K
]
button and then [PLAY] button on the unit. Adjust
the height of Guide Rollers [2] and [3] (Fig. M3,
Page 2-3-3) watching the oscilloscope display so
that the envelope becomes as flat as possible. To
do this adjustment, turn the top of the Guide
Roller with the Guide Roller Adj. Screwdriver.
3. If the envelope is as shown in Fig. M7, adjust the
height of Guide Roller [2] (Refer to Fig. M3) so
that the waveform looks like the one shown in Fig.
M9.
4. If the envelope is as shown in Fig. M8, adjust the
height of Guide Roller [3] (Refer to Fig. M3) so
that the waveform looks like the one shown in Fig.
M9.
5. When Guide Rollers [2] and [3] (Refer to Fig. M3)
are aligned properly, there is no envelope drop
either at the beginning or end of track as shown in
Fig. M9.
Note:
Upon completion of the adjustment of Guide
Rollers [2] and [3] (Refer to Fig. M3), check the X
Value by pushing the [CHANNEL
K
] or [CHANNEL
L
]
buttons on the unit alternately, to check the symmetry
of the envelope. Check the number of pushes to
ensure preset position. The number of pushes
[CHANNEL
K
] button on the unit to achieve 1/2 level
of envelope should match the number of pushes
[CHANNEL
L
] button on the unit from center. If
required, redo the “X Value Alignment.”
No Good
Good
FM envelope output signal is low.
2ms
FM envelope signal
CTL signal
Center Position
FM envelope output signal
is adjusted at maximum.
Fig. M7
Dropping envelope level at the beginning of track.
Fig. M8
Dropping envelope level at the end of track.
Fig. M9
Envelope is adjusted properly. (No envelope drop)
Fig. M10
Содержание 19MDTR20 - Dvd-video Player
Страница 56: ...WF11 PIN 5 OF CN571 Q571 Collector WF10 1 6 43 1 6 44 H V CBA Bottom View TV VCR Section BTD850F01031 A...
Страница 86: ...1 11 3 TD857PEX S2 PACKING TAPE S6 S7 S1 S3 S4 S4 X1 X12 X3 X4 X9 S4 TAPE X13 X25 X2 X11 X8 X10 Packing...
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Страница 99: ...1 4 1 T0006IBR REMOTE CONTROL OPERATION...
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Страница 147: ...R583 H Adjustment Sub CBA Top View TV VCR Section 1 8 41 1 8 42 BT1000F01022 A...
Страница 162: ...1 10 3 T0006PEX Packing S2 S6 S7 S3 S1 X1 X3 X4 X25 X5 X11 1 X11 3 Packing Tape Tape X2 1 S4 X9 X2 2 FRONT S5 S4 S4...
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Страница 258: ...1 18 2 T0102PEX FRONT S4 S4 S1 X1 Tape X9 S4 X4 X2 1 X25 X3 S3 S6 S7 S2 Packing Tape X2 2 Packing...
Страница 277: ...2 4 9 N2466FTDA 43 41 42 L 13 Fig DM16 44 45 Slide P 9 Fig DM17...
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Страница 375: ...1 18 2 T0102PEX FRONT S4 S4 S1 X1 Tape X9 S4 X4 X2 1 X25 X3 S3 S6 S7 S2 Packing Tape X2 2 Packing...
Страница 394: ...2 4 9 N2466FTDA 43 41 42 L 13 Fig DM16 44 45 Slide P 9 Fig DM17...