Testing The Display - Novatech 1730 Series Reference Manual

Novatech Controls
Diagnostics Mode Keypad Interaction
The Diagnostics Mode consists of a series of numbered tests with user interaction being provided using
the local keypad and display.
Each individual test is designed to focus on a specific hardware component within the transmitter.
While some tests are fully automatic and non-interactive, others have several options that can be
adjusted by the operator using the keypad.
1
The Option Up/Down and Enter keys perform different functions depending on the test. Please refer to
specific test application notes to see what keys are enabled for specific tests and their specific function
Pre Diagnostics Mode Tests
During the initialisation of Diagnostics Mode the transmitter performs two basic tests to confirm that
the display and keypad are functioning properly.

Testing the Display

On entering Diagnostics Mode the display test flashes a series of patterns on the display, and given that
there is no feedback to electronically confirm whether the display updated correctly it is up to the
technician to observe and determine whether the display is functioning properly.
The display test rapidly cycles through showing all pixels on, then all pixels off, then two patterns where
pixels alternate on or off. If the display contains any dead pixels, or if any regions are not updating
properly it should be immediately obvious to the technician.
The test can be repeated by power cycling the transmitter to restart Diagnostics Mode
Failure in this test would indicate a problem related to either the LCD module, the display PCB, or the
keypad/display bus buffers on the main PCB. In the majority of cases the solution would be to replace
the entire display PCB including the LCD module. It has also been observed that in some cases when
there has been voltage spiking on the mains, or if high voltage has been incorrectly applied to any of the
burner input or BFT inputs then the display bus buffer IC1 on the main PCB may be damaged.
On completion the transmitter immediately progresses to the second preliminary test.
Document Revision 1.03
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1730 Series Diagnostics Mode Reference Manual
1. Function Up/Down – Change the test number
2. Option Up/Down – Change the test option
3. Enter – Toggle test option
Diagnostics Mode v1.08