4. TROUBLE SHOOTING
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4.9. Keypad Backlight Trouble
• Backlight Operation
– The keypad LED backlight is controlled with LEDB signal.
– LEDB signal from ABB.
– The LEDs are forward biased and turned on.
• Check Point
– LEDB signal
– LEDs
• Trouble Shooting Setup
– Connect PIF-UNION to the phone, and
power on.
– Enter engineering mode.
– Go to menu “Baseband
→
Backlight
→
Keypad on”
• Trouble Shooting Procedure
– Check the soldering of components.
– Check the LEDB signal.
– Check LEDs.
AVL5M02-200
LD409
VBAT
LD406
LD404
LD405
R416
200
R414
200
200
R413
LD402
200
R421
LD412
LD408
200
R419
20
R423
200
R415
VA402
R410
200
200
R409
20
R422
200
R411
R412
200
R420
200
LD413
LD403
LD414
LD407
R408
200
LD401
IOTA
U101
LEDB
LEDB
Check
LEDB signal
R422,R423
Block Diagram
Содержание L1150
Страница 1: ...Service Manual Model L1150 Service Manual L1150 P N MMBD0034601 Date June 2004 Issue 1 0 ...
Страница 3: ......
Страница 18: ...3 H W Circuit Description 17 Figure 1 Receiver Part Block Diagram ...
Страница 42: ...3 H W Circuit Description 41 A BaseBand Components Component Side ...
Страница 43: ...3 H W Circuit Description 42 B BaseBand Components Keypad Side C Digital Baseband DBB Processor ...
Страница 51: ...4 TROUBLE SHOOTING 50 BaseBand Part Troubleshooting 4 1 Baseband Components Component Side 4 TROUBLE SHOOTING ...
Страница 102: ...5 DISASSEMBLY INSTRUCTION 101 5 DISASSEMBLY INSTRUCTION 2 1 1 2 ...
Страница 103: ...5 DISASSEMBLY INSTRUCTION 102 1 2 3 ...
Страница 104: ...5 DISASSEMBLY INSTRUCTION 103 2 1 1 2 ...
Страница 105: ...5 DISASSEMBLY INSTRUCTION 104 3 ...
Страница 106: ...5 DISASSEMBLY INSTRUCTION 105 ...
Страница 113: ...7 BLOCK DIAGRAM 112 Baseband Part 7 BLOCK DIAGRAM The Block Diagram of the Baseband Part ...
Страница 122: ... 121 9 PCB LAYOUT ...
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