19
HCD-VX555/VX555J
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 (YEDS-18) and playback the number five track.
4.
Press the
u
button. (Becomes the 1track jump mode.)
5.
Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
1 track jump waveform
Specification level:
x
100=less than
±
22%
6.
After check, remove the lead wire connected in step 1.
RF PLL Free-run Frequency
Procedure :
1.
Connect frequency counter to test point (XPCK) with lead wire.
2.
Turned Power switch on.
3.
Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MHz.
oscilloscope
BD board
TP (TEO)
TP (DVC)
+
–
A
B
+
–
frequency counter
BD board
TP (XPCK)
Adjustment Location :
[ BD (CD) BOARD ] — SIDE B —
IC103
IC101
TP
(RFDC)
TP
(CE)
TP
(RFAC)
TP
(XPCK)
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.1
±
0.3Vp-p
0V
Center of
waveform
B
Symmetry
A (DC voltage)
level=1.3
±
0.6Vp-p
Summary of Contents for HCD-VX555
Page 35: ...35 35 HCD VX555 VX555J 6 11 SCHEMATIC DIAGRAM AMP SECTION ...
Page 39: ...39 39 HCD VX555 VX555J 6 15 SCHEMATIC DIAGRAM PANEL SW SECTION ...
Page 41: ...41 41 HCD VX555 VX555J 6 17 SCHEMATIC DIAGRAM LEAF SW SECTION ...
Page 46: ...46 46 HCD VX555 VX555J 6 22 SCHEMATIC DIAGRAM VIDEO SECTION 2 3 See page 23 for Wavefoms ...
Page 47: ...47 47 HCD VX555 VX555J 6 23 SCHEMATIC DIAGRAM VIDEO SECTION 3 3 See page 23 for Wavefoms ...
Page 49: ...49 49 HCD VX555 VX555J 6 25 SCHEMATIC DIAGRAM TRANS SECTION ...