Sony HCD-XG500 Service Manual - Page 18

CD S-Curve Check, Level Check, E-F Balance 1 Track Jump Check, BD BOARD Side B

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HCD-XG60/XG500 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 10 MΩ 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 BD board oscilloscope TP (FE) + TP (VC) - Procedure: 1. Connect oscilloscope to TP (FE) and TP (VC). 2. Connect between TP (FE1) and TP (VC) by lead wire. 3. Connect between TP (AGCCON) and TP (GND) by lead wire. 4. Turn the power ON. 5. Load a disc (YEDS-18) and actuate the focus search. (In con- sequence of open and close the disc tray, actuate the focus search) 6. Cofirm that the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 4 ± 1 Vp-p. S-curve waveform symmetry A within 4 ± 1 Vp-p B E-F Balance (1 Track Jump) Check oscilloscope (DC range) BD board TP (TE) + TP (VC) - Procedure : 1. Connect oscilloscpe to TP (TE) and TP (VC). 2. Turn the power ON. 3. Load a disc (YEDS-18) and playback the number five track. 4. Press the H X button. (Becomes the 1 track jump mode) 5. Confirm that the level B and A (DC voltage) on the oscillo- scope waveform. 1 track jump waveform 0V center of waveform B A (DC voltage) level = 1.3 ± 0.6 Vp-p symmetry Specified level: A B × 100 = less than ± 22% 6. After check, remove the lead wire connected in step 1. Checking Location: - BD BOARD (Side B) - 7. After check, remove the lead wire connected in step 2 and 3. 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. RF Level Check BD board oscilloscope (AC range) TP (RF) + TP (VC) - Procedure: 1. Connect oscilloscope to TP (RF) and TP (VC). 2. Connect between TP (AGCCON) and TP (GND) by lead wire. 3. Turn the power ON. 4. Load a disc (YEDS-18) and press the H X button to play. 5. Confirm that the oscilloscope waveform is clear and check RF signal level is correct or not. 6. After check, remove the lead wire connected in step 2. Note: Clear RF signal waveform means that the shape " " can be clearly distinguished at the center of the waveform. VOLT/DIV: 200 mV TIME/DIV: 500 ns (with the 10: 1 probe in use) level: 1.45 ± 0.3 Vp-p TP (VC) IC102 TP (GND) TP (RF) IC103 TP (AGCCON) TP (FE) TP (TE) TP (FE1) 18

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18
HCD-XG60/XG500
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 10 M
Ω
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 oscilloscope to TP (FE) and TP (VC).
2.
Connect between TP (FE1) and TP (VC) by lead wire.
3.
Connect between TP (AGCCON) and TP
(GND)
by lead wire.
4.
Turn the power ON.
5.
Load a disc (YEDS-18) and actuate the focus search. (In con-
sequence of open and close the disc tray, actuate the focus
search)
6.
Cofirm that the oscilloscope waveform (S-curve) is symmetri-
cal between A and B.
And confirm peak to peak level within
4
±
1 Vp-p.
S-curve waveform
7.
After check, remove the lead wire connected in step 2 and 3.
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.
RF
Level Check
Procedure:
1.
Connect oscilloscope to TP (RF) and TP (VC).
2.
Connect between TP (AGCCON) and TP (GND) by lead wire.
3.
Turn the power ON.
4.
Load a disc (YEDS-18) and press the
H
X
button to play.
5.
Confirm that the oscilloscope waveform is clear and check RF
signal level is correct or not.
6.
After check, remove the lead wire connected in step 2.
Note:
Clear RF signal waveform means that the shape “
” can be clearly
distinguished at the center of the waveform.
CD SECTION
+
–
BD board
TP (FE)
TP (VC)
oscilloscope
A
B
symmetry
within 4
±
1 Vp-p
+
–
BD board
TP (RF)
TP (VC)
oscilloscope
(AC range)
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(with the 10: 1 probe
in use)
level:
1.45
±
0.3 Vp-p
E-F Balance (1 Track Jump) Check
Procedure :
1.
Connect oscilloscpe to TP (TE) and TP (VC).
2.
Turn the power ON.
3.
Load a disc (YEDS-18) and playback the number five track.
4.
Press the
H
X
button. (Becomes the 1 track jump mode)
5.
Confirm that the level B and A (DC voltage) on the oscillo-
scope waveform.
1 track jump waveform
Specified level:
×
100 = less than
±
22%
6.
After check, remove the lead wire connected in step 1.
Checking Location:
A
B
+
–
BD board
TP (TE)
TP (VC)
oscilloscope
(DC range)
A (DC voltage)
center of
waveform
B
0V
level = 1.3
±
0.6 Vp-p
symmetry
– BD BOARD (Side B) –
TP (VC)
TP (FE)
TP (FE1)
TP (TE)
TP (RF)
TP (AGCCON)
TP (GND)
IC102
IC103