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TABLE OF CONTENTS
1. GENERAL
Location of Controls (XR-4790) .................................... 3
Location of Controls (XR-4800) .................................... 4
Installation....................................................................... 5
Connections ..................................................................... 6
2. DISASSEMBLY ......................................................... 8
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. Printed Wiring Boards –Main Section–.......................... 20
6-2. Schematic Diagram –Main Section– ............................. 23
6-3. Printed Wiring Board –Panel Section– (XR-4790)....... 28
6-4. Schematic Diagram –Panel Section– (XR-4790)......... 31
6-5. Printed Wiring Board –Panel Section– (XR-4800)....... 33
6-6. Schematic Diagram –Panel Section– (XR-4800)......... 35
6-7. IC Pin Function Description ........................................... 37
7. EXPLODED VIEWS................................................ 40
8. ELECTRICAL PARTS LIST ............................... 44
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.
