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18
HCD-VX777
Note:
Clear RF signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.
RF signal waveform
E-F Balance (1 Track jump) Check
Procedure:
1.
Connect oscilloscope to TP (TEO) and TP (DVC) board.
2.
Turned Power switch on.
3.
Load a disc (LUV-P01) and playback the number nine track.
4.
Press the
bB
button. (Becomes the 1track jump mode.)
5.
Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
1 track jump waveform
6.
Adjust RV101 so that A (DC voltage) becomes 0.
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 0.65
±
0.15Vp-p (RFDC)
1.1
±
0.4Vp-p (RFAC)
oscilloscope
BD board
TP (TEO)
TP (DVC)
+
–
DVC
Center of
waveform
B
Symmetry
A (DC voltage)
level=1.0
±
0.5Vp-p
Checking Location:
[BD BOARD]
IC103
IC101
TP
(RFDC)
TP
(CE)
TP
(RFAC)
TP
(XPCK)
VIDEO SECTION
Frequency adjustment
1.
Connect the frequency counter to check point of the VIDEO
board.
2.
Adjust CT503 of the VIDEO board so that the frequency
counter read 27MHz ± 80Hz at STOP condition.
[ VIDEO BOARD ] – SIDE B –
Adjustment Location :
[ VIDEO BOARD ] – SIDE A –
frequency counter
VIDEO board
(27 MHz)
+
–
SL501
IC502
SL502
SL503
TEST
MODE
SL501 SL502
CT503
SL503
TEST MODE
VIDEO
FREQUENCY
(27MHz)
(GND)
IC507
IC505
Содержание HCD-VX777
Страница 13: ...13 HCD VX777 VIDEO BOARD SIDE A J301 CN501 CN301 1 2 3 CN503 SL503 SL502 SL501 CHECK LED CN502 ...
Страница 37: ...37 37 HCD VX777 6 17 SCHEMATIC DIAGRAM POWER AMP SECTION Page 47 Page 47 Page 34 Page 34 ...
Страница 41: ...41 41 HCD VX777 6 21 SCHEMATIC DIAGRAM CD SW PAD SWITCH SECTION Page 39 Page 39 ...
Страница 43: ...43 43 HCD VX777 6 23 SCHEMATIC DIAGRAM LEAF SW SECTION E 4 4 Page 34 ...
Страница 45: ...45 45 HCD VX777 6 25 SCHEMATIC DIAGRAMS DRIVER SECTION See page 50 for IC Block Diagrams IC B D B 2 4 Page 32 ...
Страница 47: ...47 47 HCD VX777 6 27 SCHEMATIC DIAGRAM TRANS SECTION H Page 37 Page 37 ...