Aiwa CX-BK33 Service Manual page 30

CX-BK33
QQ
3 7 63 1515 0
E-F BALANCE ADJUSTMENT
Connection:
BD board
TP (TE)
TP (VC)
Procedure:
1. Connect an oscilloscpe to test point TP (TE) and TP (VC) on
the BD board.
2. AC is put in pushing
N
3. Put the disc (YEDS-18) in to playback the number five track.
4. Press the button. If it plays, press the
N
(The tracking servo and the sledding servo are turned OFF)
5. Rotate RV101 on the BD board to adjust A (DC voltage) of
the center of the oscilloscope waveform becomes 0 V.
Traverse Waveform
0V
6. Press the button. (The tracking servo and sledding servo
N
are turned ON)
Confirm A (DC voltage) at that tome is 0 V.
TE
L 13942296513
7. To exit from this mode, turn the power off.
Note: • 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.
Traverse Waveform
0V
Tracking servo
Sled servo
OFF
Checking Location: BD board (Side B)
ADJUSTMENT AFTER CD BASE UNIT (BU-30CBD64NS)
IS REPLACED
Perform the "E-F Balance (1 track jump) check".
www
.
30
http://www.xiaoyu163.com
oscilloscope
+
–
button to enter the CD test mode.
button again. B
N
Center of
the waveform
B
A (DC
voltage)
level: 1.0 ± 0.5 Vp-p
A (DC
voltage)
Tracking servo
Sled servo
ON
x ao
y
i
http://www.xiaoyu163.com
8
Checking Location:
– BD BOARD (Side B) –
RV101
E-F Balance
Adjustment
TP8
(RFAC)
TP7
(VC)
IC103
Q Q
3 6 7 1 3
u163
.
2 9 9 4 2 8
IC101
TP2
(TE)
TP6
(RFDC)
TP4
(FE)
1 5 0 5 8 2 9 9 4
m
co
9 9
2 8 9 9