– 2 –
TABLE OF CONTENTS
1. GENERAL
Location of Controls (XR-4790) .................................... 3
Location of Controls (XR-4800) .................................... 4
Resetting the Unit ........................................................... 5
Detaching the Front Panel............................................... 5
Setting the Clock ............................................................. 5
Installation (US, Canadian model) ................................. 6
Installation (E model) ..................................................... 7
Connection ...................................................................... 8
2. DISASSEMBLY ......................................................... 10
3. ASSEMBLY OF MECHANISM DECK ............ 12
4. MECHANICAL ADJUSTMENTS ....................... 15
5. ELECTRICAL ADJUSTMENTS
Test Mode ........................................................................ 15
Tape Deck Section .......................................................... 15
Tuner Section .................................................................. 16
6. DIAGRAMS ................................................................. 19
6-1. Printed Wiring Board –MAIN Section– ........................ 21
6-2. Schematic Diagram –MAIN Section– ........................... 23
6-3. Printed Wiring Board –PANEL Section– (XR-4790) ... 27
6-4. Schematic Diagram –PANEL Section– (XR-4790) ...... 29
6-5. Printed Wiring Board –PANEL Section– (XR-4800) .... 31
6-6. Schematic Diagram –PANEL Section– (XR-4800) ...... 33
6-7. IC Pin Function Description ........................................... 35
7. EXPLODED VIEWS ................................................ 38
8. ELECTRICAL PARTS LIST ............................... 42
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.
Power amplifier section
Outputs Speaker outputs
(sure seal connectors)
Speaker impedance 4 – 8 ohms
Maximum power output 35 W × 4 (at 4 ohms)
General
Outputs Power antenna control
lead/Power amplifier
control lead/Telephone
ATT control lead (E model only)
Rear line out (1)
Tone controls Bass ± 8 dB at 100 Hz
Treble ± 8 dB at 10 kHz
Power requirements 12 V DC car battery
(negative ground)
Dimensions Approx. 188 × 58 × 181 mm
(7
1
/
2
× 2
3
/
8
× 7
1
/
4
in.)
(w/h/d)
Mounting dimensions Approx. 182 × 53 × 164 mm
(7
1
/
4
× 2
1
/
8
× 6
1
/
2
in.)
(w/h/d)
Mass Approx. 1.2 kg (2 lb. 10 oz.)
Supplied accessories Parts for installation and connections (1 set)
Front panel case (1)
Design and specifications are subject to change without notice.
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