Read Sony XR-CA420N Service Manual online
2
XR-CA420N
TABLE OF CONTENTS
1.
GENERAL
Location of Controls .......................................................
3
2.
DISASSEMBLY
2-1. Disassembly Flow ...........................................................
4
2-2. Cover ...............................................................................
4
2-3. Mechanism Deck (MG-25F-136) ...................................
5
2-4. MAIN Board ...................................................................
5
2-5. Heat Sink .........................................................................
6
3.
ASSEMBLY OF MECHANISM DECK
3-1. Assembly Flow ................................................................
7
3-2. Housing ...........................................................................
8
3-3. Arm (Suction) .................................................................
8
3-4. Lever (LDG-A)/(LDG-B) ...............................................
9
3-5. Gear (LDG-FT) ...............................................................
9
3-6. Guide (C) ......................................................................... 10
3-7. Mounting Position of Capstan/Reel Motor (M901) ....... 10
3-7. Mounting Position of Capstan/Reel Motor (M901) ....... 10
4.
MECHANICAL ADJUSTMENTS
....................... 11
5.
ELECTRICAL ADJUSTMENTS
Tape Deck Section .......................................................... 11
Tuner Section .................................................................. 11
Tuner Section .................................................................. 11
6.
DIAGRAMS
6-1. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 12
6-2. Printed Wiring Board – MAIN Board – ......................... 14
6-3. Schematic Diagram – MAIN Board (1/3) – ................... 15
6-4. Schematic Diagram – MAIN Board (2/3) – ................... 16
6-5. Schematic Diagram – MAIN Board (3/3) – ................... 17
6-6. Printed Wiring Board – KEY Board – ............................ 18
6-7. Schematic Diagram – KEY Board – .............................. 19
6-8. IC Pin Function Description ........................................... 20
6-3. Schematic Diagram – MAIN Board (1/3) – ................... 15
6-4. Schematic Diagram – MAIN Board (2/3) – ................... 16
6-5. Schematic Diagram – MAIN Board (3/3) – ................... 17
6-6. Printed Wiring Board – KEY Board – ............................ 18
6-7. Schematic Diagram – KEY Board – .............................. 19
6-8. IC Pin Function Description ........................................... 20
7.
EXPLODED VIEWS
7-1. Chassis Section ............................................................... 22
7-2. Front Panel Section ......................................................... 23
7-3. Mechanism Deck Section (MG-25F-136) ...................... 24
7-2. Front Panel Section ......................................................... 23
7-3. Mechanism Deck Section (MG-25F-136) ...................... 24
8.
ELECTRICAL PARTS LIST
............................... 25
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
• 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.
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