Aiwa CX-JV4 Service Manual page 19

E-F BALANCE (1 TRACK JUMP) 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.
bB
2. AC is put in pushing
3. Put the disc (YEDS-18) in to playback the number five track.
4. Press the bB key. If it plays, press the
(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 bB key. (The tracking servo and sledding servo
are turned ON)
Confirm A (DC voltage) at that tome is 0 V.
7. To release 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.
Traverse Waveform
0V
Tracking servo
Sled servo
OFF
Adjustment and Connecting Location: BD board
(Conductor Side)
ADJUSTMENT AFTER CD BASE UNIT (BU-30BD61S) IS
REPLACED
Perform the E-F Balance (1 track jump) adjustiment .
oscilloscope
+
—
key to enter the CD test mode.
bB key again.
Center of
the waveform
B
A (DC
voltage)
level: 1.0 ± 0.5 Vp-p
A (DC
voltage)
Tracking servo
Sled servo
ON
Adjustment and Connecting Location:
– BD BOARD (Conductor Side) –
RV101
E-F Balance TP2
(1 Track Jump) (TE)
TP6
Adjustment
(RFDC)
TP8
(RFAC)
TP7
TP4
(VC)
(FE)
IC103
CX-JV4
IC101
19