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Note:
1. CD Block is basically constructed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MΩ impedance.
4. Clean the object lens by an applicator with neutral detergent when
the signal level is low than specified value with the following
checks.
S Curve Check
Procedure :
1. Connect the oscilloscope to test points TP (FE) and TP (VC).
2. Connect TP (FEI) and TP (VC) of the MAIN board with lead
wires.
3. Press the 1/u button to turn the set ON.
4. Press the ^ button, load and eject the disc (YEDS-18) to
perform focus search.
5. Check the symmetry and peak to peak level of the oscilloscope
waveform (S curve) at this time.
6. After check, remove the lead wire connected in step 2.
Note: • Try to measure several times to make sure than the ratio of
• Take sweep time as long as possible and light up the bright-
Checking Location : MAIN board
RF Level Check
Procedure :
1. Connect oscilloscope to test point TP (RF) and TP (VC) on MAIN
board.
2. Press the 1/u button to turn the set ON.
3. Put disc (YEDS-18) in and playback No.5track.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
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oscilloscope
MAIN board
TP (FE)
+
TP (VC)
–
S-curve waveform
symmetry
A
B
A : B or B : A is more than 10 : 7.
ness to obtain best waveform.
oscilloscope
MAIN board
TP (RF)
+
–
TP (VC)
manuals search engine
SECTION 4
ELECTRICAL ADJUSTMENT
Note: Clear RF signal waveform means that the shape "◊" can be
Checking Location : MAIN board
E-F Balance (1 Track Jump) check
Procedure:
1. Connect oscilloscope to test point TP (TE) and TP (VC) on MAIN
board.
2. Press the 1/u button to turn the unit ON.
3. Put disc (YEDS-18) in and playback No.5track.
4. Press the ^ button, to pause.
5. Check the level (B) of the oscilloscope's waveform and the DC
voltage (A) of the center of the Traverse waveform.
Confirm the following:
• A/B x 100 = less then ± 22 (%)
• B = 1.3 ±
Within 3.8 ± 1 Vp-p
1 track jump waveform
0V
Checking Location : MAIN board
[ MAIN BOARD ] — SIDE A —
clearly distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.2 ± 0.2 Vp-p
oscilloscope
MAIN board
TP (TE)
+
–
TP (VC)
+0.6
Vp-p
–0.7
+0.6
level : 1.3 ±
Vp-p
–0.7
TP
(FE)
IC303
TP
IC301
(RF)
TP
TP
(TE)
(VC)
TP
(FEI)
HCD-EX100
Center of the waveform
B
A (DC voitage)
Symmetry
13
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