Sony HCD-MDX10 Service Manual - Page 39

CD SECTION 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 10MΩ 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. S Curve Check BD board oscilloscope TP (FE) + TP (VC) - 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 ^ 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. S-curve waveform symmetry 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 : 1.45 ± 0.3 Vp-p Adjustment Location : BD (CD) board E-F Balance (1 Track Jump) check oscilloscope BD board 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 ^ button. 5. Check the level B of the oscilloscope's waveform and the A (DC voltage) of the center of the Traverse waveform. Confirm the following: • A/B x 100 = less then ± 22 (%) • B = 1.3 ± 0.6 Vp-p 1 track jump waveform Center of the waveform A Within 4 ± 1 Vp-p B 0V B A (DC voitage) 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. Adjustment Location : BD (CD) board RF Level Check BD board oscilloscope TP (RF) + TP (VC) - level : 1.3 ± 0.6 Vp-p Symmetry Adjustment Location : BD (CD) board Adjustment Location : [ BD (CD) BOARD ] - SIDE A - TP (VC) Procedure : 1. Connect oscilloscope to test point TP (RF) and TP (VC) on BD board. 2. Connect TP (AGCCON) and GND of the BD board with lead wires. 3. Press the 1/u button to turn the set ON. 4. Put disc (YEDS-18) in and playback 5track. 5. Confirm that oscilloscope waveform is clear and check RF sig- nal level is correct or not. 6. After check, remove the lead wire connected in step 2. TP (RF) TP (AGCCON) TP (FE) TP (TE) TP (FE1) 8-1. CIRCUIT BOARDS LOCATION SECTION 8 DIAGRAMS HCD-MDX10 STANDBY board MD LINK board MD DIGITAL board DISPLAY board ENCAPSULATED COMPONENT (US,CND,AR,KR,SP,MY,HK,AUS) TUNER unit (AEP,UK,E,G,CIS) JOG board VOL board SECONDARY board MAIN board • Abbreviation CND : Canadian model G : German model SP : Singapore model MY : Malaysia model HK : Hong Kong model AR : Argentine model KR : Korea model AUS : Australian model ENCAPSULATED COMPONENT/TUNER unit is supplied as the assembled block. CONNECTOR board SENSOR board POWER SW board MOTOR (TURN) board SW board BD (CD) board BD (MD) board CD PANEL board LEAF SW board MOTOR (SLIDE) board MD LINK SW board AUDIO board - 39 - - 40 -