19
CX-LFA660/LFA770
Checking Location: BD81A board (Side B)
+
–
BD81A board
TP (TEO)
TP (VC)
oscilloscope
Traverse Waveform
0V
B
level: 1.0
±
0.5 Vp-p
Center of
the waveform
A (DC
voltage)
Traverse Waveform
Tracking servo
Sled servo
ON
C (DC
voltage)
Sled servo
6.
Press the button. (The tracking servo and
sledding servo are turned ON)
7. To exit from this mode, turn the power off.
Notes:
• Always move the optical pick-up to most inside track when
exiting from this mode. Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can
be chipped.
E-F Balance Adjustment
Connection:
Procedure:
1.
Connect an oscilloscpe to test point TP (TEO) and TP (VC) on
the BD81A board.
2.
Press three buttons
x
3.
Put the disc (YEDS-18) in to playback the number five track.
4.
Press the button. If it plays, press the
CD
NX
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
±
10%
CD
NX
CD
NX
PLAY MODE/TUNING MODE
and
simulfaneously enter the CD test mode.
Z
CD
Checking Location:
– BD81A BOARD (Side B) –
button again. (The tracking servo and the sledding servo are
turned OFF)
,
,
(SideB)
BD81A BOARD
IC251
IC301
IC101
IC303
TP
(RFACO)
TP
(VC)
TP
(FEO)
TP
(RFDCO)
TP
(TEO)
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