Troubleshooting the Controller/Display

Keyboard

Keyboard

The A1 Keyboard assembly contains both the keys and the knob. The keyboard is configured in a matrix with the rows being scanned with pulses from the A7 Controller and the columns being read by the controller. The column lines are pulled up through resistors and are pulled low when a key is pressed. The A7 Controller determines which key is being pressed by reading which column line is pulled low and which row the column line is being pulled low through. Since the row outputs are tri-state, the low-going pulses are not seen on the output until a key is pressed and the current path is completed.

The keyboard can be checked with an oscilloscope by disconnecting the ribbon cable from the keyboard and checking for the pull-up voltages on the column pins. Then with the keyboard connected, check that the lines are being pulled low at the A7 Controller connector J4. The pin numbers on A7-J4 are the same as those on A1-J1. The ribbon cable connector has a mark to indicate to pin 1. Pin 2 is directly opposite pin 1.

Table 5-1

HP/Agilent 8922E/F/G/H/M/S Keyboard (HP/Agilent 8922 A/B keys shown in

 

parenthesis)

 

 

 

 

 

 

 

 

 

 

 

 

 

Column 0

Column 1

Column 2

Column 3

Column 4

Column 5

 

Pin 9

Pin 10

Pin 11

Pin 12

Pin 13

Pin 14

 

 

 

 

 

 

 

 

CELL

ORGCALL

RCVCALL

ENDCALL

L1(K4)

L2(K5)

 

CONFIG

(K1)

(K2)

(K3)

 

 

 

(RF GEN/

 

 

 

 

 

 

RF ANL)

 

 

 

 

 

 

 

 

 

 

 

 

 

CELL

INCR÷10

down arrow

not used

SHIFT

CANCEL

 

CNTL

 

 

 

 

 

 

(HOP

 

 

 

 

 

 

CNTRL)

 

 

 

 

 

 

 

 

 

 

 

 

 

MEAS

INCRSET

PRESET

not used

not used

not used

 

SYNC

 

 

 

 

 

 

 

 

 

 

 

 

 

PREV

INCR×10

up arrow

not used

not used

leftarrow

 

 

 

 

 

 

 

 

TESTS

7

4

1

0

ON/OFF

 

 

 

 

 

 

 

 

MEAS

8

5

2

.

ppm W

 

ARM

 

 

 

 

 

 

 

 

 

 

 

 

 

RECALL

9

6

3

+/-

% dBμV

 

 

 

 

 

 

 

 

LOCAL

ENTER

GHZ dBm

MHz V

kHzmV

Hz μV

 

 

 

 

 

 

 

5-6

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Page 52
Image 52
Agilent Technologies 8922 manual Keyboard, Parenthesis Column Pin
Page 51 Page 53

8922 specifications

Agilent Technologies 8922 is a versatile and robust mobile communication test set, designed to fulfill the demanding requirements of wireless device manufacturers and service providers. Primarily focused on mobile radio communications, the 8922 provides a comprehensive solution for testing a wide array of signaling standards and technologies, making it essential in the rapidly evolving telecommunications landscape.

One of the standout features of the Agilent 8922 is its support for multiple wireless standards, including GSM, GPRS, EDGE, WCDMA, and HSPA. This makes the device an ideal choice for testing mobile devices that operate on different generations of cellular networks. Additionally, the 8922 is equipped with advanced measurement capabilities, allowing users to perform key performance indicators assessments, such as power, modulation quality, and spectral emission analysis, ensuring devices meet stringent regulatory and performance standards.

The 8922 is designed with an intuitive user interface that simplifies the setup and execution of tests. It features a large color display, making it easier for users to view test results and navigate through various functions. The built-in automation capabilities enable seamless integration into production environments, where efficiency and repeatability are crucial for high-volume testing.

Technologically, the Agilent 8922 incorporates advanced signal processing algorithms, which enhance its measurement accuracy and speed. The device's architecture allows for real-time analysis of signals, enabling users to identify issues quickly and efficiently. This is particularly important in the realm of mobile communications, where time-to-market is critical for competitive advantage.

Another significant characteristic of the 8922 is its flexible configuration options. Users can customize the test set with different hardware and software modules to suit specific testing needs. This scalability ensures that the 8922 remains relevant as wireless technologies evolve and new standards emerge.

In conclusion, the Agilent Technologies 8922 is an indispensable tool for professionals engaged in the testing of mobile communications devices. Its broad support for multiple standards, advanced measurement capabilities, user-friendly design, and flexibility make it a top choice in the telecommunications testing community. As the mobile communication industry continues to advance, the 8922 stands out as a leading solution for ensuring that devices meet quality and performance expectations.
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