48
Note:
A clear RF signal waveform means that the shape “
◊
” can be clearly
distinguished at the center of the waveform.
RF signal waveform
Checking Location: BD (CD) board
E-F Balance Check
Connection:
Procedure:
1. Connect an oscilloscpe to test point TP (TE) and TP (VC) on the
BD (CD) board.
2. Turn the power on.
3. Put the disc (YEDS-18) in to playback the number five track.
4. Press the
[REPEAT]
button. (The tracking servo and the sled-
ding servo are turned OFF)
5. Check the level B of the oscilliscope's waveform and the A (DC
voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
Traverse Waveform
button. (The tracking servo and sledding
servo are turned ON)
Confirm the C (DC voltage) is almost equal to the A (DC volt-
age) is step 5.
Checking Location: BD (CD) board
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(normal speed)
level: 1.2
±
0.2 Vp-p
+
–
BD (CD) board
TP (TE)
TP (VC)
oscilloscope
(DC range)
0 V
B
level: 1.3
±
0.6 Vp-p
Center of
the waveform
A (DC
voltage)
0 V
Tracking servo
Sled servo
ON
C (DC
voltage)
Tracking servo
Sled servo
OFF
Checking Location:
IC171
IC101
TP
(VC)
TP
(FE)
TP (TE)
TP (RF)
– BD (CD) BOARD (Conductor Side) –
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TEL 13942296513 QQ 376315150 892498299
