Cd Section - Sony HCD-PX5 Service Manual

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Adjustment and checking Loacation:
– BD (MD) BOARD (Component Side) –
D101
CN101
– BD (MD) BOARD (Conductor Side) –
TE
L 13942296513
IC190
Note: It is useful to use the jig for checking BD (MD) board waveform.
(Refer to Servicing Notes on page 9)
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IC101
CN105
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IC151
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8

CD SECTION

Note:
1. CD Block is basically designed to operate without adjustment. There-
fore, 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.
5. Level doesn't change whichever with normal speed or with four times
speed.
S Curve Check
Connection:
BD (CD) board
Procedure:
1. Connect an oscilloscope to test point TP (FE) and TP (VC) on
the BD (CD) board.
2. Turn the power on.
3. Put the disc (YEDS-18) in and turned power switch on again
and actuate the focus search. (actuate the focus search when disc
table is moving in and out)
4. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 3.6 ±
0.5 Vp-p.
Q Q
3 6 7 1 3 1 5
S-curve waveform
1. I+3V
2. IOP
3. GND
4. TE
5. FE
6. VC
7. RF
Note: • Try to measure several times to make sure than the ratio of A : B
or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the
brightness to obtain best waveform.
Checking Location: BD (CD) board (see page 48)
RF Level Check
Connection:
BD (CD) board
Procedure:
1. Connect an oscilloscope to test point TP (RF) and TP (VC) on
the BD (CD) board.
2. Turn the power on.
3. Put the disc (YEDS-18) in to playback the number five track.
4. Confirm that oscilloscope waveform is clear and check RF sig-
co
nal level is correct or not.
.
9 4 2 8
oscilloscope
(DC range)
TP (FE)
+
TP (VC)
–
0 5 8 2 9 9 4 2 8
symmetry
A
within 3.6 ± 0.5 Vp-p
B
oscilloscope
(AC range)
TP (RF)
+
TP (VC)
–
m
9 9
9 9
47