Sony xr ca 420 service manual

This is the 36 pages manual for sony xr ca 420 service manual.
Read or download the pdf for free. If you want to contribute, please upload pdfs to audioservicemanuals.wetransfer.com.

Page: 1 / 36
sony xr ca 420 service manual

Extracted text from sony xr ca 420 service manual (Ocr-read)


Page 1

2 XR-CA420 TABLE OF CONTENTS 1. GENERAL Location of Controls ....................................................... 3 2. DISASSEMBLY 2-1. Disassembly Flow ........................................................... 8 2-2. Cover ............................................................................... 8 2-3. Mechanism Deck (MG-25F-136) ................................... 9 2-4. MAIN Board ................................................................... 9 2-5. Heat Sink ......................................................................... 10 3. ASSEMBLY OF MECHANISM DECK 3-1. Assembly Flow ................................................................ 11 3-2. Housing ........................................................................... 12 3-3. Arm (Suction) ................................................................. 12 3-4. Lever (LDG-A)/(LDG-B) ............................................... 13 3-5. Gear (LDG-FT) ............................................................... 13 3-6. Guide (C) ......................................................................... 14 3-7. Mounting Position of Capstan/Reel Motor (M901) ....... 14 4. MECHANICAL ADJUSTMENTS ....................... 15 5. ELECTRICAL ADJUSTMENTS Tape Deck Section .......................................................... 15 Tuner Section .................................................................. 15 6. DIAGRAMS 6-1. Note for Printed Wiring Boards and Schematic Diagrams ....................................................... 16 6-2. Printed Wiring Board – MAIN Board – ......................... 18 6-3. Schematic Diagram – MAIN Board (1/3) – ................... 19 6-4. Schematic Diagram – MAIN Board (2/3) – ................... 20 6-5. Schematic Diagram – MAIN Board (3/3) – ................... 21 6-6. Printed Wiring Board – KEY Board – ............................ 22 6-7. Schematic Diagram – KEY Board – .............................. 23 6-8. IC Pin Function Description ........................................... 24 7. EXPLODED VIEWS 7-1. Chassis Section ............................................................... 26 7-2. Front Panel Section ......................................................... 27 7-3. Mechanism Deck Section (MG-25F-136) ...................... 28 8. ELECTRICAL PARTS LIST ............................... 29Notes on chip component replacement - Never reuse a disconnected chip component. - Notice that the minus side of a tantalum capacitor may be dam- aged by heat. Flexible Circuit Board Repairing - Keep the temperature of the soldering iron around 270 ˚C dur- ing repairing. - Do not touch the soldering iron on the same conductor of the circuit board (within 3 times). - Be careful not to apply force on the conductor when soldering or unsoldering.

Page 2

3 XR-CA420 SECTION 1 GENERAL This section is extracted from instruction manual. 5 Location of controls RELEASE SEL MODESRC OFF DD-BASSMBP 6 5 4 3 2 1 B T M DSPL DISC REP SHUF BL SKIP ATA MTL AT T SEEK AMS SENS SOURCE Refer to the pages listed for details. 1Volume +/– button 7, 10 2MODE (o) button During tape playback: Playback direction change 7, 8 During radio reception: BAND select 9 During CD/MD playback: CD/MD unit select 12 3SRC (SOURCE) (TUNER/TAPE/CD/MD) button 7, 9, 12 4SEL (select) button 7, 10, 11, 12, 13 5Display window 6MBP (My Best sound Position) button 12 7D (D-BASS) button 11 8Z (eject) button 7 9RELEASE (front panel release) button 6, 15 q;ATT (attenuate) button 10 qaSENS button 10 qsRESET button (located on the front side of the unit behind the front panel) 6 qdFrequency select switch (located on the bottom of the unit) See Frequency select switch in the Installation/Connections manual.qfNumber buttons 8, 9, 11, 13, 14 During radio reception: Preset number select 9 During tape playback: (3)REP 8 (5)BL SKIP 8 (6)ATA 8 During CD/MD playback: (1)DISC – 13 (2)DISC + 13 (3)REP 14 (4)SHUF 14 qgBTM/MTL ( Best Tuning Memory/Metal ) button 8, 9 qhDSPL (display mode change) button 7, 12, 13 qjOFF button* 6, 7 qkSEEK/AMS +/– button 8, 9, 10, 13 Seek 10 Automatic Music Sensor 8, 13 Manual search 13 *Warning when installing in a car without ACC (accessory) position on the ignition key switch Be sure to press (OFF) on the unit for two seconds to turn off the clock display after turning off the engine. When you press (OFF) momentarily, the clock display does not turn off and this causes battery wear.