Entering Diagnostics Mode - Novatech 1730 Series Reference Manual

Novatech Controls

Entering Diagnostics Mode

To switch the transmitter to Diagnostics Mode you will need;
- Medium size flat head screwdriver to unscrew front case screws
- Small flat-head screw driver to change DIP switch position
Before continuing, disconnect power to the transmitter.
This should be done before opening the front case of the transmitter to eliminate the risk of electrical
shock.
After power has been disconnected, use the medium sized flat-head screwdriver to unscrew the four
screws on the front of the transmitter case. The screws are captive spring-loaded and will spring clear of
the base once fully unscrewed.
Open the case to reveal the inside electronics.
The lower left-hand side of the main PCB has a set of four DIP switches which can be accessed through a
hole in the shield (if fitted). It is not necessary to remove the EMI shield to access Diagnostics Mode,
however it may be required to remove the shield for further testing at a later stage.
While the transmitter is switched off, use a small flat-head screwdriver to move the bottom DIP switch
(labelled DIAG) to the right.
Re-connect power to the transmitter and switch on.
At this point, instead of displaying the Novatech logo and usual runtime information the display will say
'Loading Diagnostics...' with a version number on the second line. The version number indicates the
version of the Diagnostics Mode module compiled into the current EEPROM.
If the device powers up as described then you can skip the next chapter relating to power failure.
Total Power Failure
If the transmitter fails to power up when mains power is re-connected and switched on, you should
proceed to checking the mains circuitry for faults.
- Visually inspect the circuit board, mains power plug and mains power isolation switch SW2
checking that the connector wires and connectors are firmly inserted, and that SW2 is in the ON
position. Look for any blackened areas or scorch marks on the PCB or connectors that may
indicate a fault. Take particular note of the components marked VR3, VR4, VR5, VR6, VR7.
- Switch off the transmitter and remove the PCB fuse marked FS1 located adjacent to the main
AC-DC converter. If you find that this fuse is blown then it is very likely the Main AC-DC
converter block PS5 is damaged and will require replacement.
If PS5 is faulty it will cause FS1 to blow. If you replace blown FS1 without replacing faulty PS5 and
try switching the device back on you may notice the lights come on for about a second, then the
device going dead again as PS5 will immediately blow FS1.
Document Revision 1.03
1730 Series Diagnostics Mode Reference Manual
Page 2 of 16 Diagnostics Mode v1.08