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Text excerpt from page 19 (click to view)
CX-JS5 SECTION 5 ELECTRICAL ADJUSTMENTS
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� 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. Note: Clear RF signal waveform means that the shape � � � can be clearly distinguished at the center of the waveform.
RF signal waveform VOLT/DIV : 200mV TIME/DIV : 500ns
level : 1.0 ±0.3Vp-p
S-CURVE CHECK
Oscilloscope BD board
Connecting Location: BD board
TP(FE) TP(VC)
� BD Board (Conductor side) �
Procedure : 1. Connect an oscilloscope to TP (FE) and TP (VC). 2. 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 3 ± 0.5 Vp-p.
S-curve waveform symmetry
TP (RF)
A within 3 ±0.5Vp-p B
TP (VC) TP (FE)
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.
Procedure : 1. Connect an oscilloscope to TP (RF) and TP (VC). 2. Turn the power on. 3. Load a disc (YEDS-18) and playback. 4. Confirm that oscilloscope waveform is clear and check if RF signal level is correct or not.
