Sony HCD-MG110, Service Manual

Page: 19 / 74

19
HCD-MG110/MG310AV
Ver 1.1
E-F Balance Check
Connection:
Procedure:
1.
Connect an oscilloscpe to test point TP (TE) and TP (VC) on
the CD board.
2. Turn the power on.
3. Put the disc (PATD-012) in to playback the number two track.
4. Press the
[REPEAT]
button. (The tracking servo and the
sledding 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
6. Press the
[REPEAT]
button. (The tracking servo and sledding
servo are turned ON)
Confirm the C (DC voltage) is almost equal to the A (DC
voltage) is step 5.
Traverse Waveform
Checking Location: CD board
+
–
CD board
TP (TE)
TP (VC)
oscilloscope
0V
B
level: 1.15
±
0.5 Vp-p
Center of
the waveform
A (DC
voltage)
0V
Tracking servo
Sled servo
ON
C (DC
voltage)
Tracking servo
Sled servo
OFF
Checking Location:
– CD BOARD (Conductor Side) –
TP (VC)
TP (FEI)
TP (TE)
TP
(RFDC)
TP
(RFAC)
IC103
IC101