2
TABLE OF CONTENTS
1. SERVICING NOTES ............................................... 3
2. GENERAL
Location of Controls (XR-M500R) ................................ 4
Setting the Clock ............................................................. 4
Changing the Sound and Display Setting....................... 4
Locations of Controls (XR-M550) ................................. 5
Setting the Clock ............................................................. 5
Changing the Sound and Display Setting....................... 5
Installation (XR-M500R)................................................ 6
Installation (XR-M550) .................................................. 7
Connections (XR-M500R).............................................. 8
Connections (XR-M550) ................................................ 12
3. DISASSEMBLY ......................................................... 15
4. ASSEMBLY................................................................. 19
5. MECHANICAL ADJUSTMENTS ....................... 24
6. ELECTRICAL ADJUSTMENTS
Tape Deck Section .......................................................... 24
Tuner Section .................................................................. 25
7. DIAGRAMS
7-1. Block Diagram – TUNER/TAPE Section – .................. 27
7-2. Block Diagram – MAIN Section – ................................ 28
7-3. Block Diagram
– DISPLAY/BUS CONTROL Section – ....................... 29
7-4. Block Diagram – POWER SUPPLY Section – ............. 30
7-5. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 31
7-6. Printed Wiring Board
– MAIN Board (Component Side) – .............................. 32
7-7. Printed Wiring Board
– MAIN Board (Conductor Side) – ................................ 33
7-8. Schematic Diagram – MAIN Board (1/4) – .................. 34
7-9. Schematic Diagram – MAIN Board (2/4) – .................. 35
7-10. Schematic Diagram – MAIN Board (3/4) – .................. 36
7-11. Schematic Diagram – MAIN Board (4/4) – .................. 37
7-12. Printed Wiring Board –SUB Board – ............................ 38
7-13. Schematic Diagram – SUB Board – .............................. 39
7-14. Printed Wiring Board – DISPLAY Board – .................. 40
7-15. Schematic Diagram – DISPLAY Board – ..................... 41
7-16. IC Pin Function Description ........................................... 44
8. EXPLODED VIEWS ................................................ 51
9. ELECTRICAL PARTS LIST ............................... 55
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.
General
Outputs Audio output (2) (M500R)
Audio output (3) (M550)
Power aerial relay control
lead
Power amplifier control
lead
Inputs Telephone ATT control
lead
Illumination control lead
Tone controls Bass ±9 dB at 100 Hz
Treble ±9 dB at 10 kHz
Power requirements 12 V DC car battery
(negative earth)
Dimensions Approx. 178
(7
1
/
8
× 2 × 7
4
/
1
in.)
(7
1
/
4
× 2
1
/
8
× 6
1
/
2
in.)
× 50 × 182 mm
(w/h/d)
Mounting dimensions Approx. 182 × 53 × 163 mm
(w/h/d)
Mass Approx. 1.3 kg (2lb. 14 oz.)
Supplied accessories Card remote commander
RM-X94 (XR-M550)
RM-X96 (XR-M500R)
Parts for installation and
connections (1 set)
Design and specifications are subject to change
without notice.
Power amplifier section
Outputs Speaker outputs
Speaker impedance 4 – 8 ohms
Maximum power output 50 W × 4 (at 4 ohms)
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