Sony HCD-HPX7 Service Manual - Page 56

Cd S-curve, Check, Level

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HCD-HPX7 CD SECTION Note: 1. CD Block is basically designed to operate without adjustment. Therefore, check each item in order given. 2. Use YEDS-18 (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 Oscilloscope CD board TP(FE) TP(VC) Procedure : 1. Connect an oscilloscope to TP (FE) and TP (VC) on the CD board. 2. Press the ?/1 button to turn the power ON. 3. Load a disc (YEDS-18) and actuate the focus search. (In consequence of open and close the disc tray, actuate the focus search) 4. Confirm that the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 2.0 ± 0.5 Vp-p. S-curve waveform symmetry RF signal waveform VOLT/DIV : 200mV TIME/DIV : 500ns level : 0.7 ± 0.3 Vp-p - CD BOARD (Conductor Side) - TP (VC) TP (FE) IC101 A within 2.0 ± 0.5 Vp-p B TP (RFACO) 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. Connecting Location: CD board RFAC LEVEL CHECK CD board TP(RFACO) TP(VC) oscilloscope Procedure : 1. Connect an oscilloscope to TP (RFACO) and TP (VC) on the CD board. 2. Press the ?/1 button to turn the power ON. 3. Load a disc (YEDS-18) and playback. 4. Confirm that oscilloscope waveform is clear and check if RFAC signal level is correct or not. Note: Clear RFAC signal waveform means that the shape "◊" can be clearly distinguished at the center of the waveform. Connecting Location: CD board 56

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56
HCD-HPX7
CD board
Oscilloscope
TP(FE)
TP(VC)
symmetry
S-curve waveform
within 2.0
±
0.5 Vp-p
A
B
TP(RFACO)
CD board
oscilloscope
TP(VC)
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 0.7
±
0.3 Vp-p
– CD BOARD (Conductor Side) –
TP
(VC)
TP
(FE)
TP
(RFACO)
IC101
CD SECTION
Note:
1.
CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2.
Use YEDS-18 (3-702-101-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10M
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 an oscilloscope to TP (FE) and TP (VC) on the CD
board.
2.
Press the
?/1
button to turn the power ON.
3.
Load a disc (YEDS-18) and actuate the focus search. (In con-
sequence of open and close the disc tray, actuate the focus
search)
4.
Confirm that the oscilloscope waveform (S-curve) is symmet-
rical between A and B. And confirm peak to peak level within
2.0
±
0.5 Vp-p.
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.
Connecting Location:
CD board
RFAC
LEVEL
CHECK
Procedure :
1.
Connect an oscilloscope to TP (RFACO) and TP (VC) on the
CD board.
2.
Press the
?/1
button to turn the power ON.
3.
Load a disc (YEDS-18) and playback.
4.
Confirm that oscilloscope waveform is clear and check if RFAC
signal level is correct or not.
Note:
Clear RFAC signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.
Connecting Location:
CD board