Theory of Operation
A3 Front Panel Assembly
HP EPM-441A/442A Service Guide 4-7
A3 Front Panel Assembly
The front panel assembly is made up of a liquid crystal display (LCD), a
keypad and, depending on the power meter option, a power reference cable
assembly and a sensor cable assembly(s).
There are two inputs to the front panel assembly:
• the flex circuit from connector A2J4 of the processor assembly
which controls the keypad.
• the ribbon cable from A2J3 of the processor assembly which
controls the LCD display.
The power meter self tests contain display tests. These are accessed by
pressing , , , , ,
.
System
Inputs
More
Service Self Test Individual
Display
4402serv.book Page 7 Monday, March 11, 2002 11:34 AM
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