HCD-DR4/DR5/DR6/DR440/W300/W5000/XB500
SECTION 7
DIAGRAMS
E-F Balance (1 Track Jump) check7-1. CIRCUIT BOARDS LOCATION
CD SECTION
oscilloscope
Note:
BD boardPANEL FL board
1. CD Block is basically constructed to operate without adjustment.TUNER UNIT
Therefore, check each item in order given.
TP (TE)+
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.TP (VC)�
3. Use an oscilloscope with more than 10MW impedance.
4. Clean the object lens by an applicator with neutral detergent when
the signal level is low than specified value with the fProcedure: ollowing
checks.1. Connect oscilloscope to test point TP (TE) on BD board.
2. Press the 1/u button to turn the unit ON.
S Curve Check3. Put disc (YEDS-18) in to play the number five track.
oscilloscope
4. Press the áP button.
BD board
5. Check the level B of the oscilloscope's waveform and
the A (DC voltage) of the center of the Traverse wave-
TP (FE)+
form.
TP (VC)�
Confirm the following:
JACK board
Procedure :Y A/B x 100 = less then ? 22 (%)
1. Connect the oscilloscope to test points TP (FE) and Y B = 1.3 ? 0.6 TP (VC).Vp-p
2. Connect TP (FEI) and GND, and TP (AGCCON) and GND ofTC-A board
1 track jump waveformTC-B board
the BD board with lead wires.
SUB TRANS board
3. Press the 1/u button to turn the set ON.Center of the waveform(W300/W5000/XB500)
4. With the disc (YEDS-18) loadedáP, pr bess the utton andPANEL VR board
TRANS board
perform focus search. (Focus search will be performed in the
FRONT INPUT board
B
same way even while the disc table is pushed in and out.)
5. Check the symmetry and peak to peak level of the oscilloscope
A (DC voitage)
waveform (S curve) at this time.0V
LED (PANEL) board
MAIN board
S-curve waveform
symmetrySymmetry
level : 1.3 ? 0.6 Vp-p
A
Adjustment Location :
Within 3 ? 1 Vp-p
B
[ BD BOARD ] N SIDE A N
6. After check, remove the lead wire connected in step 2.
Note: Y Try to measure several times to make sure than the ratio of
CD-L board
A : B or B : A is more than 10 : 7.
Y Take sweep time as long as possible and light up the bright-
ness to obtain best waveform.
TP
(VC)DOOR SWITCH board
PA board
RF Level Check
CD-R board
oscilloscope
BD boardTABLE SENSOR board
TP
TP (RF)+(RF)
TP (VC)�
LEAF SW board
TP
Procedure :(AGCCON)
1. Connect oscilloscope to test point TP (RF) and TP (VC) on BD
board.TP (FE)
2. Press the 1/u button to turn the set ON.TP
TP
3. Put disc (YEDS-18) in and playback 5 track.(TE)
(FE1)AUDIO board
4. Confirm that oscilloscope waveform is clear and check RF sig-
BD board
nal level is correct or not.
Note:Clear RF signal waveform means that the shape a� can beO
clearly distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
CD MOTOR board
level : 1.45 ? 0.25 Vp-p
LED (CD) board
� 19 �� 20 � |
ACEC
SONY
