HCD-DR4/DR5/DR6/DR440/W300/W5000/XB500 SECTION 7 DIAGRAMS CD SECTION E-F Balance (1 Track Jump) check 7-1. CIRCUIT BOARDS LOCATION Note: 1. CD Block is basically constructed to operate without adjustment. Therefore, check each item in order given. 2. Use YEDS-18 disc (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 specified value with the following checks. oscilloscope BD board PANEL FL board TUNER UNIT TP (TE) TP (VC) + Procedure: 1. Connect oscilloscope to test point TP (TE) on BD board. 2. Press the 1 / u button to turn the unit ON. 3.
Put disc (YEDS-18) in to play the number five track. 4. Press the · P button. 5. Check the level B of the oscilloscope's waveform and the A (DC voltage) of the center of the Traverse wave- form. Confirm the following: S Curve Check oscilloscope BD board TP (FE) TP (VC) JACK board Procedure : 1. Connect the oscilloscope to test points TP (FE) and TP (VC). 2. Connect TP (FEI) and GND, and TP (AGCCON) and GND of the BD board with lead wires. 3. Press the 1 / u button to turn the set ON. 4. With the disc (YEDS-18) loaded, press the ·P button and perform focus search. (Focus search will be performed in the same way even while the disc table is pushed in and out.) 5.
Check the symmetry and peak to peak level of the oscilloscope waveform (S curve) at this time. A/B x 100 = less then ± 22 (%) B = 1.3 ± 0.6 Vp-p 1 track jump waveform TC-B board TC-A board Center of the waveform SUB TRANS board (W300/W5000/XB500) PANEL VR board FRONT INPUT board TRANS board 0V A (DC voitage) LED (PANEL) board S-curve waveform symmetry Symmetry MAIN board level : 1.3 ± 0.6 Vp-p ± 1 Vp-p Adjustment Location : [ BD BOARD ] — SIDE A — 6. After check, remove the lead wire connected in step 2. 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 bright- ness to obtain best waveform. CD-L board TP (VC) RF Level Check DOOR SWITCH board CD-R board PA board BD board oscilloscope TABLE SENSOR board TP (RF) TP (VC) TP (RF) LEAF SW board Procedure : 1. Connect oscilloscope to test point TP (RF) and TP (VC) on BD board. 2. Press the 1 / u button to turn the set ON. 3. Put disc (YEDS-18) in and playback 5 track. 4. Confirm that oscilloscope waveform is clear and check RF sig- nal level is correct or not. Note: Clear RF signal waveform means that the shape “ ” can be clearly distinguished at the center of the waveform.
TP (AGCCON) TP (FE) TP (TE) TP (FE1) AUDIO board BD board RF signal waveform VOLT/DIV : 200mV TIME/DIV : 500ns level : 1.45 ± 0.25 Vp-p CD MOTOR board LED (CD) board + – B A Within B A B Within + –