- 30 -
3.10 Keypad Switches and Key Backlight Illumination
(1) Keypad Switches
The key switches are metal domes, which make contact between two concentric pads on the
keypad layer of the PCB when pressed. There are 21 switches (KB500-KB522), connected in a
matrix of 5 rows by 5 columns, as shown in Figure, except for the power switch (KB500), which
is connected independently. Functions, the row and column lines of the keypad are connected
to ports of AD6525. The columns are outputs, while the rows are inputs and have pull-up
resistors built in. When a key is pressed, the corresponding row and column are connected
together, causing the row input to go low and generate an interrupt. The columns/rows are then
scanned by AD6525 to identify the pressed key.
Figure 3-15. Circuit Diagram of Keypad Switches.
LEFT
UP
8
6
END
3
SELECT
5
CLR
9
1
7
SEND
*
2
#
0
4
KB503
DOWN
MENU
RIGHT
CONFIRM
KB506
SP511
SP521
KB517
SP500
SP510
KB514
KB512
KB518
SP526
SP508
SP525
SP512
KB505
SP519
SP517
KB519
SP522
SP501
SP513
KB511
SP524
680
R512
SP507
KB501
680
R506
KB521
KB510
KB500
SP509
KB504
680
R515
KB509
KB520
SP520
680
R509
SP518
SP516
KB516
KB515
SP523
SP514
KB513
KB502
SP515
KB508
680
R511
680
R510
680
R514
680
R513
R508
KB507
680
680
R507
KEYROW4
KEYROW3
KEYROW2
KEYROW1
KEYCOL4
POWERKEY
KEYCOL2
KEYCOL0
KEYCOL3
KEYCOL1
KEYROW0
3. TECHNICAL BRIEF
Содержание C3100
Страница 1: ...Service Manual Model C3100 Service Manual C3100 P N MMBD0033001 Date June 2004 Issue 1 0 ...
Страница 51: ...Graph 4 15 EGSM TX 50 VCX VC2 VCX VC2 4 TROUBLE SHOOTING Graph 4 14 DCS TX ...
Страница 67: ...5 DISASSEMBLY INSTRUCTION Figure 5 1 Figure 5 2 66 5 DISASSEMBLY INSTRUCTION ...
Страница 68: ... 67 5 DISASSEMBLY INSTRUCTION Figure 5 3 Figure 5 4 ...
Страница 69: ... 68 Figure 5 5 5 DISASSEMBLY INSTRUCTION ...
Страница 70: ... 69 5 DISASSEMBLY INSTRUCTION Figure 5 6 Figure 5 7 1 3 2 4 1 2 3 ...
Страница 71: ... 70 Figure 5 8 Figure 5 9 5 DISASSEMBLY INSTRUCTION 4 2 3 1 2 1 ...
Страница 72: ... 71 5 DISASSEMBLY INSTRUCTION Figure 5 10 ...
Страница 83: ... 82 7 BLOCK DIAGRAM 7 BLOCK DIAGRAM Power supply ...
Страница 90: ... 89 9 PCB LAYOUT 9 PCB LAYOUT ...
Страница 91: ... 90 9 PCB LAYOUT ...
Страница 98: ... 97 11 3 HW Test Software for Standalone Test Setup 11 STAND ALONE TEST ...
Страница 100: ... 99 Tx Stand alone Test Setting 11 STAND ALONE TEST ...
Страница 102: ... 101 Rx Stand alone Test Setting 11 STAND ALONE TEST ...
Страница 104: ... 103 12 3 Equipment Setup Figure 12 1 Equipment Setup 12 AUTO CALIBRATION ...
Страница 107: ... 106 12 AUTO CALIBRATION ...
Страница 108: ... 107 13 EXPLODED VIEW REPLACEMENT PART LIST 13 EXPLODED VIEW REPLACEMENT PART LIST 13 1 Exploded View ...
Страница 109: ... 108 13 EXPLODED VIEW REPLACEMENT PART LIST ...