SECTION 4
ELECTRICAL BLOCK CHECKING
Note :Note :Clear RF signal waveform means that the shaa � can be cpe O learlyAdjustment Location :
1. CD Block is basically designed to operate without adjustment.distinguished at the center of the waveform.
Therefore, check each item in order given.RF signal waveform[ BD BOARD ] N Conductor Side N
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.VOLT/DIV : 200mV
3. Use an oscilloscope with more than 10MW impedance.TIME/DIV : 500ns
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.level : 1.45 ? 0.3Vp-p
S-Curve CheckTP(VC)
Oscilloscope
E-F Balance (1 Track jump) Check
BD board
oscilloscope
TP(FE)TP(RF)
BD boardTP(PLCK)
TP(VC)
TP(GND)
TP(TE)TP(AGCCON)201
TP(VC)2180
TP(FE)
Procedure :
IC101
1. Connect oscilloscope to TP (FE).TP(FE1)
TP(TE)
2. Connect between TP (FE1) and TP (VC) by lead wireProcedur. e :4061
4160
3. Connect between TP (AGCCON) and TP (GND) by lead wire.1. Connect oscilloscope to TP (TE) and TP (VC).TP(TE1)
4. Turn Power switch on.2. Turned Power switch on.
5. Load a disc (YEDS-18) and actuate the focus search. (In3. Load a disc (YEDS-18) and playback the number five track.CN102
consequence of open and close the disc tray, actua4. Prte the fess the ( bocusutton. (Becomes the 1 track jump mode.)
search)5. Confirm that the level B and A (DC voltage) on the oscilloscope
6. Confirm that the oscilloscope waveform (S-curvwavefe) isorm.
symmetrical between A and B. And confirm peak to peak level
within 4 ?1 Vp-p.1 track jump waveformcenter of
waveform
S-curve waveform
symmetry
B
A (DC voltage)
0V
A
within 4 ?1Vp-p
level=1.3?0.6Vp-p
Bsymmetry
A
Specified le �� vel:´ 100=less than ?22%
B
7. After check, remove the lead wire connected in step 2 and 3.
Note :Y Try to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.RF PLL Free-run Frequency Check
Y Take sweep time as long as possible and light up theProcedure :
brightness to obtain best waveform.1. Connect frequency counter to TP (PLCK) with lead wire.
frequency counter
RF Level CheckBD board
oscilloscopeTP (PLCK)
BD board
TP(RF)
2. Turned Power switch on.
TP(VC)
3. Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MHz.
Procedure :
1. Connect oscilloscope to TP (RF).
2. Connect between TP (AGCCON) and TP (GND) by lead wire.
3. Turned Power switch on.
4. Load a disc (YEDS-18) and playback.
5. Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.
6. After check, remove the lead wire connected in step 2.
N 9 N |
ACEC
