NV-U74
2
1.
SERVICING NOTES
............................................. 3
2. GENERAL
.................................................................. 5
3. DISASSEMBLY
3-1. Disassembly Flow ........................................................... 7
3-2. Cap .................................................................................. 7
3-3. Front Block Assy, Rear Panel Block Assy ...................... 8
3-4. Battery Assy (Lithium Ion Battery) (BAT3001) ............. 8
3-5. Liquid Crystal Display Panel (LCD5001),
Touch Panel (TPS5001) .................................................. 9
3-6. MAIN Board ................................................................... 10
3-7. Case (GPS) Assy (ANT001) ........................................... 10
4.
TEST MODE
............................................................ 11
5. DIAGRAMS
5-1. Block Diagram - GPS/MEMORY/LCD Section - .......... 16
5-2. Block Diagram - MAIN Section - ................................... 17
5-3. Block Diagram - POWER SUPPLY Section - ................ 18
5-4. Printed
Wiring
Board
- MAIN Board (Component Side) - ................................ 20
5-5. Printed
Wiring
Board
- MAIN Board (Conductor Side) - .................................. 21
5-6. Schematic Diagram - MAIN Board (1/10) - ................... 22
5-7. Schematic Diagram - MAIN Board (2/10) - ................... 23
5-8. Schematic Diagram - MAIN Board (3/10) - ................... 24
5-9. Schematic Diagram - MAIN Board (4/10) - ................... 25
5-10. Schematic Diagram - MAIN Board (5/10) - ................... 26
5-11. Schematic Diagram - MAIN Board (6/10) - ................... 27
5-12. Schematic Diagram - MAIN Board (7/10) - ................... 28
5-13. Schematic Diagram - MAIN Board (8/10) - ................... 29
5-14. Schematic Diagram - MAIN Board (9/10) - ................... 30
5-15. Schematic Diagram - MAIN Board (10/10) - ................. 31
5-16. Printed Wiring Board - MS DUO Board - ...................... 32
5-17. Schematic Diagram - MS DUO Board - ......................... 32
6.
EXPLODED VIEWS
6-1. Front Block Assy Section ............................................... 48
6-2. Rear Panel Block Assy Section ....................................... 49
7.
ELECTRICAL PARTS LIST
.............................. 50
Accessories are given in the last of the electrical parts list.
TABLE OF CONTENTS
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.
FLEXIBLE CIRCUIT BOARD REPAIRING
• Keep the temperature of soldering iron around 270 °C during
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.
Summary of Contents for NV-U74
Page 57: ...MEMO NV U74 57 ...