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22
HCD-GS100
E-F Balance Check
Connection:
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”.
4.
Press three buttons of
[ENTER]
,
M
, and
[REPEAT]
si-
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
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
x
,
[CLEAR]
, and
[DISPLAY]
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
Checking Location: CD board (Conductor side)
+
–
CD board
TP (TE)
TP (DVC)
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 (FE)
TP (TE)
TP
(RFDC)
TP
(DVC)
TP
(RFAC)
IC103
IC101
Summary of Contents for HCD-GS100 - Mini Hi-fi Component System
Page 17: ...17 HCD GS100 3 19 HEADPHONE Board 1 screw BVTP2 6 8 3 HEADPHONE board 2 decoration panel ...
Page 33: ...33 33 HCD GS100 7 8 Schematic Diagram MAIN Section 1 3 See page 42 for IC Block Diagrams ...
Page 35: ...35 35 HCD GS100 7 10 Schematic Diagram MAIN Section 3 3 HEAD REC PLAY ERASE ...
Page 41: ...41 41 HCD GS100 7 16 Schematic Diagram POWER Section ...