Electrical Adjustments - Sony HCD-ZX66i Service Manual

HCD-ZX66i/ZX99i
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 specifi ed value with the fol-
lowing checks.
S-Curve Check
BD81A board
JPO102 (FEI)
TP177 (VC)
Procedure:
1. Connect oscilloscope to JPO102 (FEI) and TP177 (VC).
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. Confi rm that the oscilloscope waveform (S-curve) is symmet-
rical between A and B. And confi rm peak to peak level within
3 ±0.5 Vp-p.
S-curve waveform
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
BD81A board
TP124 (RFACO)
TP177 (VC)
Procedure:
1. Connect oscilloscope to TP124 (RFACO) and TP177 (VC).
2. Press the [\ / 1] button to turn the power ON.
3. Load a disc (YEDS-18) and playback.
4. Confi rm that oscilloscope waveform is clear and check RFAC
signal level is correct or not.
28
SECTION 5

ELECTRICAL ADJUSTMENTS

oscilloscope
symmetry
A
within 3 ± 0.5 Vp-p
B
oscilloscope
Note: Clear RF signal waveform means that the shape "◊" can be
clearly distinguished at the center of the waveform.
Checking Location:
TP177
(VC)
JPO102
(FEI)
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level: 1.3 ± 0.3 Vp-p
IC101
TP124
(RFACO)