20
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 (VC) board.
2.
Turned Power switch on.
3.
Load a disc (YEDS-18) and playback the number five track.
4.
Press the
hH
button. (Becomes the 1 track 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 Check
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.
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.45
±
0.3Vp-p
oscilloscope
BD board
TP (TEO)
TP (VC)
+
–
0V
Center of
waveform
B
Symmetry
A (DC voltage)
level=1.3
±
0.6Vp-p
A
B
+
–
frequency counter
BD board
TP (XPCK)
Adjustment Location:
[BD BOARD] (Conductor side)
TP (VC)
TP (RF)
TP (TEO)
TP (FEO)
TP (FEI)
TP (AGCCON)
TP (XPCK)
IC101
IC103
