XR-C4120 - Sony Car Audio Service Manual (repair manual). Page 2

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TABLE  OF  CONTENTS
1.
GENERAL
Location of Controls .......................................................
3
Resetting the Unit ...........................................................
4
Detaching the Front Panel ...............................................
4
Setting the Clock .............................................................
4
Other Functions ...............................................................
4
Installation .......................................................................
5
Connections .....................................................................
6
2.
DISASSEMBLY
.........................................................
9
3.
ASSEMBLY  OF  MECHANISM  DECK
........... 10
4.
MECHANICAL  ADJUSTMENTS
....................... 13
5.
ELECTRICAL  ADJUSTMENTS
Test Mode ........................................................................ 13
Tape Deck Section .......................................................... 13
Tuner Section .................................................................. 14
6.
DIAGRAMS
6-1. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 17
6-2. Printed Wiring Board – MAIN Board – ......................... 19
6-3. Schematic Diagram – MAIN Board (1/2) – ................... 21
6-4. Schematic Diagram – MAIN Board (2/2) – ................... 23
6-5. Printed Wiring Board  – KEY Board – ........................... 25
6-6. Schematic Diagram – KEY Board – .............................. 27
6-7. IC Pin Function Description ........................................... 31
7.
EXPLODED  VIEWS
................................................ 34
8.
ELECTRICAL  PARTS  LIST
............................... 37
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.
Notes 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.
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