HCD-ZX66i/ZX99i
28
SECTION 5
ELECTRICAL ADJUSTMENTS
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 speci
fi
ed value with the fol-
lowing checks.
S-Curve Check
BD81A board
oscilloscope
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. Con
fi
rm that the oscilloscope waveform (S-curve) is symmet-
rical between A and B. And con
fi
rm peak to peak level within
3 ±0.5 Vp-p.
symmetry
S-curve waveform
within 3 ± 0.5 Vp-p
A
B
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
TP124 (RFACO)
TP177 (VC)
BD81A board
oscilloscope
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. Con
fi
rm that oscilloscope waveform is clear and check RFAC
signal level is correct or not.
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
level: 1.3 ± 0.3 Vp-p
Checking Location:
TP177
(VC)
TP124
(RFACO)
JPO102
(FEI)
IC101
CD SECTION
