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Assembly Descriptions
A1 Front Frame Assembly
A1 Front Frame Assembly
The major components of the A1 Front Frame Assembly are the A1A2 Front Panel
Interface Board, A1A3 LCD, A1A4 LCD Inverter Board, and the A1A5 Front
Panel USB Interface Board, all of which are serviceable as individual components.
The A1 assembly is used to display the measurement results, accept user input via
the keyboard, and connect USB peripheral devices.
A1A2 Front Panel Interface Board
The A1A2 Front Panel Interface board is serviced as an assembly only; no
component level repair is supported.
The Front Panel Interface Board contains LCD control, Inverter drive, audio
amplifiers, internal speaker, a 4 port USB hub, and a USB keyboard
microcontroller.
The two different front panel rubber keypads attach to the back side of the board,
which has the keyboard contacts printed on the reverse side.
The 4 ports from the USB hub contained on this board go to the 2 front panel USB
connectors, the keyboard microcontroller, and the fourth port is unused.
A1A3 LCD
The LCD used is an 8.4inch XGA TFT display, which has a resolution of 1024 x
768. It has two backlights that are not individually replaceable.
A1A4 LCD Inverter Board
The Inverter Board provides the high voltage required by the LCD backlights.
A1A5 Front Panel USB Interface Board
The Front Panel USB Interface Board provides the front panel USB connections.
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Chapter 3
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Table of Contents
Troubleshooting
