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HCD-GS100
E-F Balance Check
Connection:
CD board
TP (TE)
TP (DVC)
Procedure:
1.
Connect an oscilloscpe to test point TP (TE) and TP (DVC) on
the CD board.
2.
Turn the power on.
3.
Select the function "CD".
[ENTER]
4.
Press three buttons of
multaneously to set the CD service mode.
5.
Put the disc (YEDS-18) in to playback the number five track.
.
6.
Press the
button. (The tracking servo and the sledding
servo are turned OFF)
7.
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
0V
.
8.
Press the
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.
9. To exit from this mode, perform as follows.
1) Move the optical pick-up to the most inside track.
2) Press three buttons of
simultaneously. (cold reset)
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
Checking Location: CD board (Conductor side)
22
oscilloscope
+
–
[REPEAT]
,
, and
M
Center of
the waveform
B
A (DC
voltage)
level: 1.15 ± 0.5 Vp-p
[CLEAR]
[DISPLAY]
,
, and
x
C (DC
voltage)
Tracking servo
Sled servo
ON
Checking Location:
– CD BOARD (Conductor Side) –
IC103
si-
TP
(RFAC)
TP (FE)
TP (TE)
(RFDC)
TP (VC)
TP
(DVC)
IC101
TP
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